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Posted to user@jmeter.apache.org by Marlon Santos <ms...@exist.com> on 2007/03/01 02:30:38 UTC
Re: [Newbie] Thread won't die issue
Hi,
We are also experiencing the same thing. Actually we are in an environment
where we need to load test a website but when I was running the test on
small number of virtual users it works fine. But later on, when we increased
the number of virtual users at some point in time the threads suddenly
stopped responding, or may I say the threads hang. We are in a tight
schedule so the faster this is resolved, the better it will be
appreciated...
Regards,
Marlon
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Re: [Newbie] SV: Thread won't die issue
Posted by Alexander J Turner <gi...@cubicalland.com>.
Sebb,
I think there is a good chance that you are half write. I have
investigated the issue of running out of sockets on a windows server.
The machine can run out of sockets, but it does this in a controlled
way. However, I suspect that under very heavy concurrent load windows
fails to send socket closed messages properly. I have no real proof of
this (ie I have not traced the socket chatter) as - frankly - I don't
have a machine powerful enough to monitor that much traffic. However,
Windows not closing sockets properly fits all the hanging results I have
seen.
Cheers
AJ
On Fri, 2007-03-02 at 09:50 +0000, sebb wrote:
> Just realised that there is another possibility that might be
> affecting testing with lots of threads:
>
> The host might be running out of sockets or having problems releasing them.
>
> When the hang occurs, try starting a browser on the same host and see
> if you can connect to the server under test and/or some other server.
>
> S///
> On 02/03/07, Marlon Santos <ms...@exist.com> wrote:
> >
> > Ok thanks... I will be trying this and will be keeping you posted...
> >
> >
> >
> >
> > sebb-2 wrote:
> > >
> > > If it is JMeter, then we will either need a repeatable test-case to
> > > investigate further, or someone who is experiencing the problem may be
> > > able to gather some further data about the state of JMeter: e.g. are
> > > there any deadlocks?
> > >
> > > In answer to Marlon, I suggest you try:
> > > - removing all unnecessary Listeners. You should only need one.
> > > - running in non-GUI mode
> > >
> > > Both of these reduce the load on JMeter.
> > >
> > > If that does not solve the problem, then try using multiple JMeter
> > > instances. If you then still get hangs, it is unlikely to be JMeter
> > > that is at fault.
> > >
> > > S///
> > > On 01/03/07, Alexander J Turner <gi...@cubicalland.com> wrote:
> > >> Nino,
> > >>
> > >> This is an issue that has cropped up in the past. In my experiance,
> > >> JMeter (and I am not convinced it is JMeter's fault - it could be to do
> > >> with Java) hangs when there are a lot of threads. I have seen this when
> > >> I know it is not the web server that is hanging, because I was
> > >> load-testing TAG, a web server that has a radically different approach
> > >> to the likes of Apache and IIS, and for which I could monitor all the
> > >> internals. I have also seen this on Linux and Window XP.
> > >>
> > >> I think the real issue is that no software works well with very large
> > >> numbers of threads. If you really want to run vast numbers of
> > >> concurrent actions, you need a non-blocking approach. Note, Apache does
> > >> not uses non-blocking, but it does thread pooling, which results in it
> > >> actually not handling large numbers of concurrent activities, it just
> > >> lets the OS queue them.
> > >>
> > >> The only real way to destruction test a web server is to have multiple
> > >> machines hitting it at once, you cannot expect a single machine running
> > >> multiple virtual clients to do the job.
> > >>
>
> Unless the server does not handle multiple connections very well ...!
>
> > >> Best wishes
> > >>
> > >> AJ
> > >>
> > >> On Thu, 2007-03-01 at 09:42 +0100, Nino Wael wrote:
> > >> > This is pretty interesting..!
> > >> >
> > >> > We also experience something like that. My best guess rigth now are
> > >> that it's because the http server arent able to handle all those requests
> > >> at the same time, and some of them does not get a response, hence the
> > >> hanging thread.
> > >> >
> > >> > What happens in your scenario if you abort the test (ctrl+.) and run it
> > >> again. Is it the exact same number of threads that are hanging?
> > >> >
> > >> > regards Nino
> > >> >
> > >> > ________________________________
> > >> >
> > >> > Fra: Marlon Santos [mailto:msantos@exist.com]
> > >> > Sendt: to 01-03-2007 02:30
> > >> > Til: jmeter-user@jakarta.apache.org
> > >> > Emne: Re: [Newbie] Thread won't die issue
> > >> >
> > >> >
> > >> >
> > >> >
> > >> > Hi,
> > >> >
> > >> > We are also experiencing the same thing. Actually we are in an
> > >> environment
> > >> > where we need to load test a website but when I was running the test on
> > >> > small number of virtual users it works fine. But later on, when we
> > >> increased
> > >> > the number of virtual users at some point in time the threads suddenly
> > >> > stopped responding, or may I say the threads hang. We are in a tight
> > >> > schedule so the faster this is resolved, the better it will be
> > >> > appreciated...
> > >> >
> > >> > Regards,
> > >> > Marlon
> > >> > --
> > >> > View this message in context:
> > >> http://www.nabble.com/Thread-won%27t-die-issue-tf3059035.html#a9241968
> > >> > Sent from the JMeter - User mailing list archive at Nabble.com.
> > >> >
> > >> >
> > >> > ---------------------------------------------------------------------
> > >> > To unsubscribe, e-mail: jmeter-user-unsubscribe@jakarta.apache.org
> > >> > For additional commands, e-mail: jmeter-user-help@jakarta.apache.org
> > >> >
> > >> >
> > >> >
> > >> >
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> > >> --
> > >>
> > >> ==========================================
> > >> Hard Core How-To's, Coding Techniques ETC.
> > >> --- http://nerds-central.blogspot.com! ---
> > >> Nerds Central welcomes nerds :-)
> > >> ==========================================
> > >>
> > >>
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> > >
> > >
> > >
> >
> > --
> > View this message in context: http://www.nabble.com/Thread-won%27t-die-issue-tf3059035.html#a9263341
> > Sent from the JMeter - User mailing list archive at Nabble.com.
> >
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>
>
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Nerds Central welcomes nerds :-)
==========================================
Re: [Newbie] SV: Thread won't die issue
Posted by sebb <se...@gmail.com>.
On 06/03/07, Alexander J Turner <gi...@cubicalland.com> wrote:
> Marlon,
>
> This is really important to get clear. You cannot load test one machine
> with one machine unless there is a large difference is performance
> between the server (small) and client (large). This is especially true
> of JMeter, which is not tuned for performance. A Apache linux server or
> Windows IIS server will totally and utterly outperform JMeter without
> breaking out a sweat.
That depends somewhat on how well the application is written - and
what it is doing.
JMeter running a simple test plan can generate quite a substantial
load; if the server has to do a lot of work for each request it may
well be possible to overload the server.
However, I agree that the machine running JMeter should not be running
at or near its limit, otherwise the test results may be somewhat
variable. Likewise the network connection from the test machine needs
to be able to cope with the load.
> Further, if it is possible for one client
> machine to load your server significantly, you have an issue!
Depends on what the server is designed to do ...
And may depend on the test plan. e.g. if the server provides different
services, some of which are rarely needed but which are very resource
intensive, then it may well be possible for a few client threads to
cause a problem for the server. But that does not necessarily mean the
server is faulty.
> Please have this in mind when you are designing your test cases.
S.
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Re: [Newbie] SV: Thread won't die issue
Posted by Alexander J Turner <gi...@cubicalland.com>.
Marlon,
This is really important to get clear. You cannot load test one machine
with one machine unless there is a large difference is performance
between the server (small) and client (large). This is especially true
of JMeter, which is not tuned for performance. A Apache linux server or
Windows IIS server will totally and utterly outperform JMeter without
breaking out a sweat. Further, if it is possible for one client
machine to load your server significantly, you have an issue!
Please have this in mind when you are designing your test cases.
Best wishes
AJ
On Sun, 2007-03-04 at 17:47 -0800, Marlon Santos wrote:
> Hi,
>
> the problem still occurs.. i tried doing everything you said in the previous
> previous post but to no avail. May I ask, is there a recommended or
> preferred amount of virtual users and/or threads in running a test plan in
> jmeter? because we are in dire need of large volumes of user simulation. And
> about the multiple instances of JMeter that you suggested, is it alright if
> it is in the same machine or it should be on different machines? If ever it
> is alright on the SAME machine, will there be performance problems that may
> affect the results?
>
> Regards,
> Marlon
>
>
>
> sebb-2 wrote:
> >
> > Just realised that there is another possibility that might be
> > affecting testing with lots of threads:
> >
> > The host might be running out of sockets or having problems releasing
> > them.
> >
> > When the hang occurs, try starting a browser on the same host and see
> > if you can connect to the server under test and/or some other server.
> >
> > S///
> > On 02/03/07, Marlon Santos <ms...@exist.com> wrote:
> >>
> >> Ok thanks... I will be trying this and will be keeping you posted...
> >>
> >>
> >>
> >>
> >> sebb-2 wrote:
> >> >
> >> > If it is JMeter, then we will either need a repeatable test-case to
> >> > investigate further, or someone who is experiencing the problem may be
> >> > able to gather some further data about the state of JMeter: e.g. are
> >> > there any deadlocks?
> >> >
> >> > In answer to Marlon, I suggest you try:
> >> > - removing all unnecessary Listeners. You should only need one.
> >> > - running in non-GUI mode
> >> >
> >> > Both of these reduce the load on JMeter.
> >> >
> >> > If that does not solve the problem, then try using multiple JMeter
> >> > instances. If you then still get hangs, it is unlikely to be JMeter
> >> > that is at fault.
> >> >
> >> > S///
> >> > On 01/03/07, Alexander J Turner <gi...@cubicalland.com> wrote:
> >> >> Nino,
> >> >>
> >> >> This is an issue that has cropped up in the past. In my experiance,
> >> >> JMeter (and I am not convinced it is JMeter's fault - it could be to
> >> do
> >> >> with Java) hangs when there are a lot of threads. I have seen this
> >> when
> >> >> I know it is not the web server that is hanging, because I was
> >> >> load-testing TAG, a web server that has a radically different approach
> >> >> to the likes of Apache and IIS, and for which I could monitor all the
> >> >> internals. I have also seen this on Linux and Window XP.
> >> >>
> >> >> I think the real issue is that no software works well with very large
> >> >> numbers of threads. If you really want to run vast numbers of
> >> >> concurrent actions, you need a non-blocking approach. Note, Apache
> >> does
> >> >> not uses non-blocking, but it does thread pooling, which results in
> >> it
> >> >> actually not handling large numbers of concurrent activities, it just
> >> >> lets the OS queue them.
> >> >>
> >> >> The only real way to destruction test a web server is to have multiple
> >> >> machines hitting it at once, you cannot expect a single machine
> >> running
> >> >> multiple virtual clients to do the job.
> >> >>
> >
> > Unless the server does not handle multiple connections very well ...!
> >
> >> >> Best wishes
> >> >>
> >> >> AJ
> >> >>
> >> >> On Thu, 2007-03-01 at 09:42 +0100, Nino Wael wrote:
> >> >> > This is pretty interesting..!
> >> >> >
> >> >> > We also experience something like that. My best guess rigth now are
> >> >> that it's because the http server arent able to handle all those
> >> requests
> >> >> at the same time, and some of them does not get a response, hence the
> >> >> hanging thread.
> >> >> >
> >> >> > What happens in your scenario if you abort the test (ctrl+.) and run
> >> it
> >> >> again. Is it the exact same number of threads that are hanging?
> >> >> >
> >> >> > regards Nino
> >> >> >
> >> >> > ________________________________
> >> >> >
> >> >> > Fra: Marlon Santos [mailto:msantos@exist.com]
> >> >> > Sendt: to 01-03-2007 02:30
> >> >> > Til: jmeter-user@jakarta.apache.org
> >> >> > Emne: Re: [Newbie] Thread won't die issue
> >> >> >
> >> >> >
> >> >> >
> >> >> >
> >> >> > Hi,
> >> >> >
> >> >> > We are also experiencing the same thing. Actually we are in an
> >> >> environment
> >> >> > where we need to load test a website but when I was running the test
> >> on
> >> >> > small number of virtual users it works fine. But later on, when we
> >> >> increased
> >> >> > the number of virtual users at some point in time the threads
> >> suddenly
> >> >> > stopped responding, or may I say the threads hang. We are in a tight
> >> >> > schedule so the faster this is resolved, the better it will be
> >> >> > appreciated...
> >> >> >
> >> >> > Regards,
> >> >> > Marlon
> >> >> > --
> >> >> > View this message in context:
> >> >> http://www.nabble.com/Thread-won%27t-die-issue-tf3059035.html#a9241968
> >> >> > Sent from the JMeter - User mailing list archive at Nabble.com.
> >> >> >
> >> >> >
> >> >> >
> >> ---------------------------------------------------------------------
> >> >> > To unsubscribe, e-mail: jmeter-user-unsubscribe@jakarta.apache.org
> >> >> > For additional commands, e-mail: jmeter-user-help@jakarta.apache.org
> >> >> >
> >> >> >
> >> >> >
> >> >> >
> >> >> >
> >> ---------------------------------------------------------------------
> >> >> > To unsubscribe, e-mail: jmeter-user-unsubscribe@jakarta.apache.org
> >> >> > For additional commands, e-mail: jmeter-user-help@jakarta.apache.org
> >> >> --
> >> >>
> >> >> ==========================================
> >> >> Hard Core How-To's, Coding Techniques ETC.
> >> >> --- http://nerds-central.blogspot.com! ---
> >> >> Nerds Central welcomes nerds :-)
> >> >> ==========================================
> >> >>
> >> >>
> >> >> ---------------------------------------------------------------------
> >> >> To unsubscribe, e-mail: jmeter-user-unsubscribe@jakarta.apache.org
> >> >> For additional commands, e-mail: jmeter-user-help@jakarta.apache.org
> >> >>
> >> >>
> >> >
> >> > ---------------------------------------------------------------------
> >> > To unsubscribe, e-mail: jmeter-user-unsubscribe@jakarta.apache.org
> >> > For additional commands, e-mail: jmeter-user-help@jakarta.apache.org
> >> >
> >> >
> >> >
> >>
> >> --
> >> View this message in context:
> >> http://www.nabble.com/Thread-won%27t-die-issue-tf3059035.html#a9263341
> >> Sent from the JMeter - User mailing list archive at Nabble.com.
> >>
> >>
> >> ---------------------------------------------------------------------
> >> To unsubscribe, e-mail: jmeter-user-unsubscribe@jakarta.apache.org
> >> For additional commands, e-mail: jmeter-user-help@jakarta.apache.org
> >>
> >>
> >
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==========================================
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--- http://nerds-central.blogspot.com! ---
Nerds Central welcomes nerds :-)
==========================================
Re: [Newbie] SV: Thread won't die issue
Posted by sebb <se...@gmail.com>.
Did you try running a browser from the same machine when the problem occurred?
This should help show if the host is running out of ports.
As to how many users can be supported - well the answer is really how
many work OK - and that depends on the test plan and lots of other
factors.
Running separate instances of JMeter on the same host may or may not
help, depending on what the problem is: e.g. if the host is running
out of sockets, it probably won't help.
Certainly worth trying though. If it does work, then that suggests a
problem with JMeter and/or the JVM.
If you define the thread count and ramp-up using properties - e.g.
${__P(threads)} - you can pass this to the test plan as -Jthreads=123.
This makes it easy to test various scenarios.
S.
On 05/03/07, Marlon Santos <ms...@exist.com> wrote:
>
> Hi,
>
> the problem still occurs.. i tried doing everything you said in the previous
> previous post but to no avail. May I ask, is there a recommended or
> preferred amount of virtual users and/or threads in running a test plan in
> jmeter? because we are in dire need of large volumes of user simulation. And
> about the multiple instances of JMeter that you suggested, is it alright if
> it is in the same machine or it should be on different machines? If ever it
> is alright on the SAME machine, will there be performance problems that may
> affect the results?
>
> Regards,
> Marlon
>
>
>
> sebb-2 wrote:
> >
> > Just realised that there is another possibility that might be
> > affecting testing with lots of threads:
> >
> > The host might be running out of sockets or having problems releasing
> > them.
> >
> > When the hang occurs, try starting a browser on the same host and see
> > if you can connect to the server under test and/or some other server.
> >
> > S///
> > On 02/03/07, Marlon Santos <ms...@exist.com> wrote:
> >>
> >> Ok thanks... I will be trying this and will be keeping you posted...
> >>
> >>
> >>
> >>
> >> sebb-2 wrote:
> >> >
> >> > If it is JMeter, then we will either need a repeatable test-case to
> >> > investigate further, or someone who is experiencing the problem may be
> >> > able to gather some further data about the state of JMeter: e.g. are
> >> > there any deadlocks?
> >> >
> >> > In answer to Marlon, I suggest you try:
> >> > - removing all unnecessary Listeners. You should only need one.
> >> > - running in non-GUI mode
> >> >
> >> > Both of these reduce the load on JMeter.
> >> >
> >> > If that does not solve the problem, then try using multiple JMeter
> >> > instances. If you then still get hangs, it is unlikely to be JMeter
> >> > that is at fault.
> >> >
> >> > S///
> >> > On 01/03/07, Alexander J Turner <gi...@cubicalland.com> wrote:
> >> >> Nino,
> >> >>
> >> >> This is an issue that has cropped up in the past. In my experiance,
> >> >> JMeter (and I am not convinced it is JMeter's fault - it could be to
> >> do
> >> >> with Java) hangs when there are a lot of threads. I have seen this
> >> when
> >> >> I know it is not the web server that is hanging, because I was
> >> >> load-testing TAG, a web server that has a radically different approach
> >> >> to the likes of Apache and IIS, and for which I could monitor all the
> >> >> internals. I have also seen this on Linux and Window XP.
> >> >>
> >> >> I think the real issue is that no software works well with very large
> >> >> numbers of threads. If you really want to run vast numbers of
> >> >> concurrent actions, you need a non-blocking approach. Note, Apache
> >> does
> >> >> not uses non-blocking, but it does thread pooling, which results in
> >> it
> >> >> actually not handling large numbers of concurrent activities, it just
> >> >> lets the OS queue them.
> >> >>
> >> >> The only real way to destruction test a web server is to have multiple
> >> >> machines hitting it at once, you cannot expect a single machine
> >> running
> >> >> multiple virtual clients to do the job.
> >> >>
> >
> > Unless the server does not handle multiple connections very well ...!
> >
> >> >> Best wishes
> >> >>
> >> >> AJ
> >> >>
> >> >> On Thu, 2007-03-01 at 09:42 +0100, Nino Wael wrote:
> >> >> > This is pretty interesting..!
> >> >> >
> >> >> > We also experience something like that. My best guess rigth now are
> >> >> that it's because the http server arent able to handle all those
> >> requests
> >> >> at the same time, and some of them does not get a response, hence the
> >> >> hanging thread.
> >> >> >
> >> >> > What happens in your scenario if you abort the test (ctrl+.) and run
> >> it
> >> >> again. Is it the exact same number of threads that are hanging?
> >> >> >
> >> >> > regards Nino
> >> >> >
> >> >> > ________________________________
> >> >> >
> >> >> > Fra: Marlon Santos [mailto:msantos@exist.com]
> >> >> > Sendt: to 01-03-2007 02:30
> >> >> > Til: jmeter-user@jakarta.apache.org
> >> >> > Emne: Re: [Newbie] Thread won't die issue
> >> >> >
> >> >> >
> >> >> >
> >> >> >
> >> >> > Hi,
> >> >> >
> >> >> > We are also experiencing the same thing. Actually we are in an
> >> >> environment
> >> >> > where we need to load test a website but when I was running the test
> >> on
> >> >> > small number of virtual users it works fine. But later on, when we
> >> >> increased
> >> >> > the number of virtual users at some point in time the threads
> >> suddenly
> >> >> > stopped responding, or may I say the threads hang. We are in a tight
> >> >> > schedule so the faster this is resolved, the better it will be
> >> >> > appreciated...
> >> >> >
> >> >> > Regards,
> >> >> > Marlon
> >> >> > --
> >> >> > View this message in context:
> >> >> http://www.nabble.com/Thread-won%27t-die-issue-tf3059035.html#a9241968
> >> >> > Sent from the JMeter - User mailing list archive at Nabble.com.
> >> >> >
> >> >> >
> >> >> >
> >> ---------------------------------------------------------------------
> >> >> > To unsubscribe, e-mail: jmeter-user-unsubscribe@jakarta.apache.org
> >> >> > For additional commands, e-mail: jmeter-user-help@jakarta.apache.org
> >> >> >
> >> >> >
> >> >> >
> >> >> >
> >> >> >
> >> ---------------------------------------------------------------------
> >> >> > To unsubscribe, e-mail: jmeter-user-unsubscribe@jakarta.apache.org
> >> >> > For additional commands, e-mail: jmeter-user-help@jakarta.apache.org
> >> >> --
> >> >>
> >> >> ==========================================
> >> >> Hard Core How-To's, Coding Techniques ETC.
> >> >> --- http://nerds-central.blogspot.com! ---
> >> >> Nerds Central welcomes nerds :-)
> >> >> ==========================================
> >> >>
> >> >>
> >> >> ---------------------------------------------------------------------
> >> >> To unsubscribe, e-mail: jmeter-user-unsubscribe@jakarta.apache.org
> >> >> For additional commands, e-mail: jmeter-user-help@jakarta.apache.org
> >> >>
> >> >>
> >> >
> >> > ---------------------------------------------------------------------
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> >> > For additional commands, e-mail: jmeter-user-help@jakarta.apache.org
> >> >
> >> >
> >> >
> >>
> >> --
> >> View this message in context:
> >> http://www.nabble.com/Thread-won%27t-die-issue-tf3059035.html#a9263341
> >> Sent from the JMeter - User mailing list archive at Nabble.com.
> >>
> >>
> >> ---------------------------------------------------------------------
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> >>
> >>
> >
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> >
> >
> >
>
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> View this message in context: http://www.nabble.com/Thread-won%27t-die-issue-tf3059035.html#a9303389
> Sent from the JMeter - User mailing list archive at Nabble.com.
>
>
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Re: [Newbie] SV: Thread won't die issue
Posted by Marlon Santos <ms...@exist.com>.
Hi,
the problem still occurs.. i tried doing everything you said in the previous
previous post but to no avail. May I ask, is there a recommended or
preferred amount of virtual users and/or threads in running a test plan in
jmeter? because we are in dire need of large volumes of user simulation. And
about the multiple instances of JMeter that you suggested, is it alright if
it is in the same machine or it should be on different machines? If ever it
is alright on the SAME machine, will there be performance problems that may
affect the results?
Regards,
Marlon
sebb-2 wrote:
>
> Just realised that there is another possibility that might be
> affecting testing with lots of threads:
>
> The host might be running out of sockets or having problems releasing
> them.
>
> When the hang occurs, try starting a browser on the same host and see
> if you can connect to the server under test and/or some other server.
>
> S///
> On 02/03/07, Marlon Santos <ms...@exist.com> wrote:
>>
>> Ok thanks... I will be trying this and will be keeping you posted...
>>
>>
>>
>>
>> sebb-2 wrote:
>> >
>> > If it is JMeter, then we will either need a repeatable test-case to
>> > investigate further, or someone who is experiencing the problem may be
>> > able to gather some further data about the state of JMeter: e.g. are
>> > there any deadlocks?
>> >
>> > In answer to Marlon, I suggest you try:
>> > - removing all unnecessary Listeners. You should only need one.
>> > - running in non-GUI mode
>> >
>> > Both of these reduce the load on JMeter.
>> >
>> > If that does not solve the problem, then try using multiple JMeter
>> > instances. If you then still get hangs, it is unlikely to be JMeter
>> > that is at fault.
>> >
>> > S///
>> > On 01/03/07, Alexander J Turner <gi...@cubicalland.com> wrote:
>> >> Nino,
>> >>
>> >> This is an issue that has cropped up in the past. In my experiance,
>> >> JMeter (and I am not convinced it is JMeter's fault - it could be to
>> do
>> >> with Java) hangs when there are a lot of threads. I have seen this
>> when
>> >> I know it is not the web server that is hanging, because I was
>> >> load-testing TAG, a web server that has a radically different approach
>> >> to the likes of Apache and IIS, and for which I could monitor all the
>> >> internals. I have also seen this on Linux and Window XP.
>> >>
>> >> I think the real issue is that no software works well with very large
>> >> numbers of threads. If you really want to run vast numbers of
>> >> concurrent actions, you need a non-blocking approach. Note, Apache
>> does
>> >> not uses non-blocking, but it does thread pooling, which results in
>> it
>> >> actually not handling large numbers of concurrent activities, it just
>> >> lets the OS queue them.
>> >>
>> >> The only real way to destruction test a web server is to have multiple
>> >> machines hitting it at once, you cannot expect a single machine
>> running
>> >> multiple virtual clients to do the job.
>> >>
>
> Unless the server does not handle multiple connections very well ...!
>
>> >> Best wishes
>> >>
>> >> AJ
>> >>
>> >> On Thu, 2007-03-01 at 09:42 +0100, Nino Wael wrote:
>> >> > This is pretty interesting..!
>> >> >
>> >> > We also experience something like that. My best guess rigth now are
>> >> that it's because the http server arent able to handle all those
>> requests
>> >> at the same time, and some of them does not get a response, hence the
>> >> hanging thread.
>> >> >
>> >> > What happens in your scenario if you abort the test (ctrl+.) and run
>> it
>> >> again. Is it the exact same number of threads that are hanging?
>> >> >
>> >> > regards Nino
>> >> >
>> >> > ________________________________
>> >> >
>> >> > Fra: Marlon Santos [mailto:msantos@exist.com]
>> >> > Sendt: to 01-03-2007 02:30
>> >> > Til: jmeter-user@jakarta.apache.org
>> >> > Emne: Re: [Newbie] Thread won't die issue
>> >> >
>> >> >
>> >> >
>> >> >
>> >> > Hi,
>> >> >
>> >> > We are also experiencing the same thing. Actually we are in an
>> >> environment
>> >> > where we need to load test a website but when I was running the test
>> on
>> >> > small number of virtual users it works fine. But later on, when we
>> >> increased
>> >> > the number of virtual users at some point in time the threads
>> suddenly
>> >> > stopped responding, or may I say the threads hang. We are in a tight
>> >> > schedule so the faster this is resolved, the better it will be
>> >> > appreciated...
>> >> >
>> >> > Regards,
>> >> > Marlon
>> >> > --
>> >> > View this message in context:
>> >> http://www.nabble.com/Thread-won%27t-die-issue-tf3059035.html#a9241968
>> >> > Sent from the JMeter - User mailing list archive at Nabble.com.
>> >> >
>> >> >
>> >> >
>> ---------------------------------------------------------------------
>> >> > To unsubscribe, e-mail: jmeter-user-unsubscribe@jakarta.apache.org
>> >> > For additional commands, e-mail: jmeter-user-help@jakarta.apache.org
>> >> >
>> >> >
>> >> >
>> >> >
>> >> >
>> ---------------------------------------------------------------------
>> >> > To unsubscribe, e-mail: jmeter-user-unsubscribe@jakarta.apache.org
>> >> > For additional commands, e-mail: jmeter-user-help@jakarta.apache.org
>> >> --
>> >>
>> >> ==========================================
>> >> Hard Core How-To's, Coding Techniques ETC.
>> >> --- http://nerds-central.blogspot.com! ---
>> >> Nerds Central welcomes nerds :-)
>> >> ==========================================
>> >>
>> >>
>> >> ---------------------------------------------------------------------
>> >> To unsubscribe, e-mail: jmeter-user-unsubscribe@jakarta.apache.org
>> >> For additional commands, e-mail: jmeter-user-help@jakarta.apache.org
>> >>
>> >>
>> >
>> > ---------------------------------------------------------------------
>> > To unsubscribe, e-mail: jmeter-user-unsubscribe@jakarta.apache.org
>> > For additional commands, e-mail: jmeter-user-help@jakarta.apache.org
>> >
>> >
>> >
>>
>> --
>> View this message in context:
>> http://www.nabble.com/Thread-won%27t-die-issue-tf3059035.html#a9263341
>> Sent from the JMeter - User mailing list archive at Nabble.com.
>>
>>
>> ---------------------------------------------------------------------
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>>
>>
>
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>
>
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Re: [Newbie] SV: Thread won't die issue
Posted by sebb <se...@gmail.com>.
Just realised that there is another possibility that might be
affecting testing with lots of threads:
The host might be running out of sockets or having problems releasing them.
When the hang occurs, try starting a browser on the same host and see
if you can connect to the server under test and/or some other server.
S///
On 02/03/07, Marlon Santos <ms...@exist.com> wrote:
>
> Ok thanks... I will be trying this and will be keeping you posted...
>
>
>
>
> sebb-2 wrote:
> >
> > If it is JMeter, then we will either need a repeatable test-case to
> > investigate further, or someone who is experiencing the problem may be
> > able to gather some further data about the state of JMeter: e.g. are
> > there any deadlocks?
> >
> > In answer to Marlon, I suggest you try:
> > - removing all unnecessary Listeners. You should only need one.
> > - running in non-GUI mode
> >
> > Both of these reduce the load on JMeter.
> >
> > If that does not solve the problem, then try using multiple JMeter
> > instances. If you then still get hangs, it is unlikely to be JMeter
> > that is at fault.
> >
> > S///
> > On 01/03/07, Alexander J Turner <gi...@cubicalland.com> wrote:
> >> Nino,
> >>
> >> This is an issue that has cropped up in the past. In my experiance,
> >> JMeter (and I am not convinced it is JMeter's fault - it could be to do
> >> with Java) hangs when there are a lot of threads. I have seen this when
> >> I know it is not the web server that is hanging, because I was
> >> load-testing TAG, a web server that has a radically different approach
> >> to the likes of Apache and IIS, and for which I could monitor all the
> >> internals. I have also seen this on Linux and Window XP.
> >>
> >> I think the real issue is that no software works well with very large
> >> numbers of threads. If you really want to run vast numbers of
> >> concurrent actions, you need a non-blocking approach. Note, Apache does
> >> not uses non-blocking, but it does thread pooling, which results in it
> >> actually not handling large numbers of concurrent activities, it just
> >> lets the OS queue them.
> >>
> >> The only real way to destruction test a web server is to have multiple
> >> machines hitting it at once, you cannot expect a single machine running
> >> multiple virtual clients to do the job.
> >>
Unless the server does not handle multiple connections very well ...!
> >> Best wishes
> >>
> >> AJ
> >>
> >> On Thu, 2007-03-01 at 09:42 +0100, Nino Wael wrote:
> >> > This is pretty interesting..!
> >> >
> >> > We also experience something like that. My best guess rigth now are
> >> that it's because the http server arent able to handle all those requests
> >> at the same time, and some of them does not get a response, hence the
> >> hanging thread.
> >> >
> >> > What happens in your scenario if you abort the test (ctrl+.) and run it
> >> again. Is it the exact same number of threads that are hanging?
> >> >
> >> > regards Nino
> >> >
> >> > ________________________________
> >> >
> >> > Fra: Marlon Santos [mailto:msantos@exist.com]
> >> > Sendt: to 01-03-2007 02:30
> >> > Til: jmeter-user@jakarta.apache.org
> >> > Emne: Re: [Newbie] Thread won't die issue
> >> >
> >> >
> >> >
> >> >
> >> > Hi,
> >> >
> >> > We are also experiencing the same thing. Actually we are in an
> >> environment
> >> > where we need to load test a website but when I was running the test on
> >> > small number of virtual users it works fine. But later on, when we
> >> increased
> >> > the number of virtual users at some point in time the threads suddenly
> >> > stopped responding, or may I say the threads hang. We are in a tight
> >> > schedule so the faster this is resolved, the better it will be
> >> > appreciated...
> >> >
> >> > Regards,
> >> > Marlon
> >> > --
> >> > View this message in context:
> >> http://www.nabble.com/Thread-won%27t-die-issue-tf3059035.html#a9241968
> >> > Sent from the JMeter - User mailing list archive at Nabble.com.
> >> >
> >> >
> >> > ---------------------------------------------------------------------
> >> > To unsubscribe, e-mail: jmeter-user-unsubscribe@jakarta.apache.org
> >> > For additional commands, e-mail: jmeter-user-help@jakarta.apache.org
> >> >
> >> >
> >> >
> >> >
> >> > ---------------------------------------------------------------------
> >> > To unsubscribe, e-mail: jmeter-user-unsubscribe@jakarta.apache.org
> >> > For additional commands, e-mail: jmeter-user-help@jakarta.apache.org
> >> --
> >>
> >> ==========================================
> >> Hard Core How-To's, Coding Techniques ETC.
> >> --- http://nerds-central.blogspot.com! ---
> >> Nerds Central welcomes nerds :-)
> >> ==========================================
> >>
> >>
> >> ---------------------------------------------------------------------
> >> To unsubscribe, e-mail: jmeter-user-unsubscribe@jakarta.apache.org
> >> For additional commands, e-mail: jmeter-user-help@jakarta.apache.org
> >>
> >>
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: jmeter-user-unsubscribe@jakarta.apache.org
> > For additional commands, e-mail: jmeter-user-help@jakarta.apache.org
> >
> >
> >
>
> --
> View this message in context: http://www.nabble.com/Thread-won%27t-die-issue-tf3059035.html#a9263341
> Sent from the JMeter - User mailing list archive at Nabble.com.
>
>
> ---------------------------------------------------------------------
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Re: [Newbie] SV: Thread won't die issue
Posted by Marlon Santos <ms...@exist.com>.
Ok thanks... I will be trying this and will be keeping you posted...
sebb-2 wrote:
>
> If it is JMeter, then we will either need a repeatable test-case to
> investigate further, or someone who is experiencing the problem may be
> able to gather some further data about the state of JMeter: e.g. are
> there any deadlocks?
>
> In answer to Marlon, I suggest you try:
> - removing all unnecessary Listeners. You should only need one.
> - running in non-GUI mode
>
> Both of these reduce the load on JMeter.
>
> If that does not solve the problem, then try using multiple JMeter
> instances. If you then still get hangs, it is unlikely to be JMeter
> that is at fault.
>
> S///
> On 01/03/07, Alexander J Turner <gi...@cubicalland.com> wrote:
>> Nino,
>>
>> This is an issue that has cropped up in the past. In my experiance,
>> JMeter (and I am not convinced it is JMeter's fault - it could be to do
>> with Java) hangs when there are a lot of threads. I have seen this when
>> I know it is not the web server that is hanging, because I was
>> load-testing TAG, a web server that has a radically different approach
>> to the likes of Apache and IIS, and for which I could monitor all the
>> internals. I have also seen this on Linux and Window XP.
>>
>> I think the real issue is that no software works well with very large
>> numbers of threads. If you really want to run vast numbers of
>> concurrent actions, you need a non-blocking approach. Note, Apache does
>> not uses non-blocking, but it does thread pooling, which results in it
>> actually not handling large numbers of concurrent activities, it just
>> lets the OS queue them.
>>
>> The only real way to destruction test a web server is to have multiple
>> machines hitting it at once, you cannot expect a single machine running
>> multiple virtual clients to do the job.
>>
>> Best wishes
>>
>> AJ
>>
>> On Thu, 2007-03-01 at 09:42 +0100, Nino Wael wrote:
>> > This is pretty interesting..!
>> >
>> > We also experience something like that. My best guess rigth now are
>> that it's because the http server arent able to handle all those requests
>> at the same time, and some of them does not get a response, hence the
>> hanging thread.
>> >
>> > What happens in your scenario if you abort the test (ctrl+.) and run it
>> again. Is it the exact same number of threads that are hanging?
>> >
>> > regards Nino
>> >
>> > ________________________________
>> >
>> > Fra: Marlon Santos [mailto:msantos@exist.com]
>> > Sendt: to 01-03-2007 02:30
>> > Til: jmeter-user@jakarta.apache.org
>> > Emne: Re: [Newbie] Thread won't die issue
>> >
>> >
>> >
>> >
>> > Hi,
>> >
>> > We are also experiencing the same thing. Actually we are in an
>> environment
>> > where we need to load test a website but when I was running the test on
>> > small number of virtual users it works fine. But later on, when we
>> increased
>> > the number of virtual users at some point in time the threads suddenly
>> > stopped responding, or may I say the threads hang. We are in a tight
>> > schedule so the faster this is resolved, the better it will be
>> > appreciated...
>> >
>> > Regards,
>> > Marlon
>> > --
>> > View this message in context:
>> http://www.nabble.com/Thread-won%27t-die-issue-tf3059035.html#a9241968
>> > Sent from the JMeter - User mailing list archive at Nabble.com.
>> >
>> >
>> > ---------------------------------------------------------------------
>> > To unsubscribe, e-mail: jmeter-user-unsubscribe@jakarta.apache.org
>> > For additional commands, e-mail: jmeter-user-help@jakarta.apache.org
>> >
>> >
>> >
>> >
>> > ---------------------------------------------------------------------
>> > To unsubscribe, e-mail: jmeter-user-unsubscribe@jakarta.apache.org
>> > For additional commands, e-mail: jmeter-user-help@jakarta.apache.org
>> --
>>
>> ==========================================
>> Hard Core How-To's, Coding Techniques ETC.
>> --- http://nerds-central.blogspot.com! ---
>> Nerds Central welcomes nerds :-)
>> ==========================================
>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: jmeter-user-unsubscribe@jakarta.apache.org
>> For additional commands, e-mail: jmeter-user-help@jakarta.apache.org
>>
>>
>
> ---------------------------------------------------------------------
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>
>
>
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Re: SV: [Newbie] Thread won't die issue
Posted by sebb <se...@gmail.com>.
If it is JMeter, then we will either need a repeatable test-case to
investigate further, or someone who is experiencing the problem may be
able to gather some further data about the state of JMeter: e.g. are
there any deadlocks?
In answer to Marlon, I suggest you try:
- removing all unnecessary Listeners. You should only need one.
- running in non-GUI mode
Both of these reduce the load on JMeter.
If that does not solve the problem, then try using multiple JMeter
instances. If you then still get hangs, it is unlikely to be JMeter
that is at fault.
S///
On 01/03/07, Alexander J Turner <gi...@cubicalland.com> wrote:
> Nino,
>
> This is an issue that has cropped up in the past. In my experiance,
> JMeter (and I am not convinced it is JMeter's fault - it could be to do
> with Java) hangs when there are a lot of threads. I have seen this when
> I know it is not the web server that is hanging, because I was
> load-testing TAG, a web server that has a radically different approach
> to the likes of Apache and IIS, and for which I could monitor all the
> internals. I have also seen this on Linux and Window XP.
>
> I think the real issue is that no software works well with very large
> numbers of threads. If you really want to run vast numbers of
> concurrent actions, you need a non-blocking approach. Note, Apache does
> not uses non-blocking, but it does thread pooling, which results in it
> actually not handling large numbers of concurrent activities, it just
> lets the OS queue them.
>
> The only real way to destruction test a web server is to have multiple
> machines hitting it at once, you cannot expect a single machine running
> multiple virtual clients to do the job.
>
> Best wishes
>
> AJ
>
> On Thu, 2007-03-01 at 09:42 +0100, Nino Wael wrote:
> > This is pretty interesting..!
> >
> > We also experience something like that. My best guess rigth now are that it's because the http server arent able to handle all those requests at the same time, and some of them does not get a response, hence the hanging thread.
> >
> > What happens in your scenario if you abort the test (ctrl+.) and run it again. Is it the exact same number of threads that are hanging?
> >
> > regards Nino
> >
> > ________________________________
> >
> > Fra: Marlon Santos [mailto:msantos@exist.com]
> > Sendt: to 01-03-2007 02:30
> > Til: jmeter-user@jakarta.apache.org
> > Emne: Re: [Newbie] Thread won't die issue
> >
> >
> >
> >
> > Hi,
> >
> > We are also experiencing the same thing. Actually we are in an environment
> > where we need to load test a website but when I was running the test on
> > small number of virtual users it works fine. But later on, when we increased
> > the number of virtual users at some point in time the threads suddenly
> > stopped responding, or may I say the threads hang. We are in a tight
> > schedule so the faster this is resolved, the better it will be
> > appreciated...
> >
> > Regards,
> > Marlon
> > --
> > View this message in context: http://www.nabble.com/Thread-won%27t-die-issue-tf3059035.html#a9241968
> > Sent from the JMeter - User mailing list archive at Nabble.com.
> >
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: jmeter-user-unsubscribe@jakarta.apache.org
> > For additional commands, e-mail: jmeter-user-help@jakarta.apache.org
> >
> >
> >
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: jmeter-user-unsubscribe@jakarta.apache.org
> > For additional commands, e-mail: jmeter-user-help@jakarta.apache.org
> --
>
> ==========================================
> Hard Core How-To's, Coding Techniques ETC.
> --- http://nerds-central.blogspot.com! ---
> Nerds Central welcomes nerds :-)
> ==========================================
>
>
> ---------------------------------------------------------------------
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>
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Re: SV: [Newbie] Thread won't die issue
Posted by Alexander J Turner <gi...@cubicalland.com>.
Nino,
This is an issue that has cropped up in the past. In my experiance,
JMeter (and I am not convinced it is JMeter's fault - it could be to do
with Java) hangs when there are a lot of threads. I have seen this when
I know it is not the web server that is hanging, because I was
load-testing TAG, a web server that has a radically different approach
to the likes of Apache and IIS, and for which I could monitor all the
internals. I have also seen this on Linux and Window XP.
I think the real issue is that no software works well with very large
numbers of threads. If you really want to run vast numbers of
concurrent actions, you need a non-blocking approach. Note, Apache does
not uses non-blocking, but it does thread pooling, which results in it
actually not handling large numbers of concurrent activities, it just
lets the OS queue them.
The only real way to destruction test a web server is to have multiple
machines hitting it at once, you cannot expect a single machine running
multiple virtual clients to do the job.
Best wishes
AJ
On Thu, 2007-03-01 at 09:42 +0100, Nino Wael wrote:
> This is pretty interesting..!
>
> We also experience something like that. My best guess rigth now are that it's because the http server arent able to handle all those requests at the same time, and some of them does not get a response, hence the hanging thread.
>
> What happens in your scenario if you abort the test (ctrl+.) and run it again. Is it the exact same number of threads that are hanging?
>
> regards Nino
>
> ________________________________
>
> Fra: Marlon Santos [mailto:msantos@exist.com]
> Sendt: to 01-03-2007 02:30
> Til: jmeter-user@jakarta.apache.org
> Emne: Re: [Newbie] Thread won't die issue
>
>
>
>
> Hi,
>
> We are also experiencing the same thing. Actually we are in an environment
> where we need to load test a website but when I was running the test on
> small number of virtual users it works fine. But later on, when we increased
> the number of virtual users at some point in time the threads suddenly
> stopped responding, or may I say the threads hang. We are in a tight
> schedule so the faster this is resolved, the better it will be
> appreciated...
>
> Regards,
> Marlon
> --
> View this message in context: http://www.nabble.com/Thread-won%27t-die-issue-tf3059035.html#a9241968
> Sent from the JMeter - User mailing list archive at Nabble.com.
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: jmeter-user-unsubscribe@jakarta.apache.org
> For additional commands, e-mail: jmeter-user-help@jakarta.apache.org
>
>
>
>
> ---------------------------------------------------------------------
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--
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--- http://nerds-central.blogspot.com! ---
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==========================================
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SV: [Newbie] Thread won't die issue
Posted by Nino Wael <Ni...@sdk.sas.com>.
This is pretty interesting..!
We also experience something like that. My best guess rigth now are that it's because the http server arent able to handle all those requests at the same time, and some of them does not get a response, hence the hanging thread.
What happens in your scenario if you abort the test (ctrl+.) and run it again. Is it the exact same number of threads that are hanging?
regards Nino
________________________________
Fra: Marlon Santos [mailto:msantos@exist.com]
Sendt: to 01-03-2007 02:30
Til: jmeter-user@jakarta.apache.org
Emne: Re: [Newbie] Thread won't die issue
Hi,
We are also experiencing the same thing. Actually we are in an environment
where we need to load test a website but when I was running the test on
small number of virtual users it works fine. But later on, when we increased
the number of virtual users at some point in time the threads suddenly
stopped responding, or may I say the threads hang. We are in a tight
schedule so the faster this is resolved, the better it will be
appreciated...
Regards,
Marlon
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