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Posted to users@tomcat.apache.org by James Law <JL...@generic-software.com> on 2008/02/28 16:54:57 UTC
Does tomcat support multicores
Os - WinXP
CPU - Intel Quad Core
Hi I'm running a tomcat server, and would like to know if Tomcat can
make use of multiple cores? When I max the server out, all 4 cores see
little usage however the java process never uses more than 25%.
So this makes me believe that Tomcat does not make use of a multicore
system.
Would I benefit from running more than one instance and setup load
bearing between the two?
Thanks
James Law
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Re: Does tomcat support multicores
Posted by Christopher Schultz <ch...@christopherschultz.net>.
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Alan,
Alan Chaney wrote:
| XP Home only supports one core - however, that would hardly be an OS for
| a production web server (grin)
Unless XP sees an Intel ht processor as something other than two cored,
this is BS. I have XP home on one of my laptops, and it happily
recognized and utilizes both ht'd processors.
| I would suspect that the OPs factors were related to IO Bandwidth or
| running out of threads as suggested earlier. I've found that a modern
| multicore machine doesn't actually spend very much time processing the
| Tomcat stuff at all.
That's because CPUs are ridiculously fast these days compared to the
hardware with which they are coupled. Bus and memory speeds are
disappointingly low, which is where the real time is wasted. :(
- -chris
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Re: Does tomcat support multicores
Posted by Christopher Schultz <ch...@christopherschultz.net>.
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Len,
Len Popp wrote:
| (Please excuse the boring licensing details, but I've seen a lot of
| misinformation on this topic.)
Thanks for setting the record straight. I didn't want to call Alan a
liar, but I knew that his assertions were in conflict with my experience.
- -chris
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Re: Does tomcat support multicores
Posted by Len Popp <le...@gmail.com>.
(Please excuse the boring licensing details, but I've seen a lot of
misinformation on this topic.)
Microsoft Windows is licensed per-processor, not per-core. XP Home
supports 1 processor and XP Pro supports 2 processors. Each processor
may have multiple cores. Server versions can support more than 2
processors but you pay for them. (Vista works similarly.)
I've got a machine running Windows XP Home with 2 cores (Athlon X2)
and it definitely uses both cores. And it's running Tomcat. :-)
reference: http://www.microsoft.com/licensing/highlights/multicore.mspx
--
Len
On Thu, Feb 28, 2008 at 4:43 PM, Alan Chaney
<al...@compulsivecreative.com> wrote:
> XP Home only supports one core - however, that would hardly be an OS for
> a production web server (grin)
>
> XP Professional is limited to 2 cpus
>
> I would suspect that the OPs factors were related to IO Bandwidth or
> running out of threads as suggested earlier. I've found that a modern
> multicore machine doesn't actually spend very much time processing the
> Tomcat stuff at all.
>
>
>
>
> Caldarale, Charles R wrote:
> >> From: Christopher Schultz [mailto:chris@christopherschultz.net]
> >> Subject: Re: Does tomcat support multicores
> >>
> >> | Doesn't XP limit itself to two cores?
> >>
> >> I don't think so.
> >
> > I'm sure some versions of XP are limited to two CPUs, since that was a
> > concern when HyperThreading was all the rage. It may be just the Home
> > edition, rather than Pro. I know the Windows Server versions (different
> > license than XP) all support at least four CPUs.
> >
> > - Chuck
> >
> >
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Re: Does tomcat support multicores
Posted by Alan Chaney <al...@compulsivecreative.com>.
XP Home only supports one core - however, that would hardly be an OS for
a production web server (grin)
XP Professional is limited to 2 cpus
I would suspect that the OPs factors were related to IO Bandwidth or
running out of threads as suggested earlier. I've found that a modern
multicore machine doesn't actually spend very much time processing the
Tomcat stuff at all.
Caldarale, Charles R wrote:
>> From: Christopher Schultz [mailto:chris@christopherschultz.net]
>> Subject: Re: Does tomcat support multicores
>>
>> | Doesn't XP limit itself to two cores?
>>
>> I don't think so.
>
> I'm sure some versions of XP are limited to two CPUs, since that was a
> concern when HyperThreading was all the rage. It may be just the Home
> edition, rather than Pro. I know the Windows Server versions (different
> license than XP) all support at least four CPUs.
>
> - Chuck
>
>
> THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY
> MATERIAL and is thus for use only by the intended recipient. If you
> received this in error, please contact the sender and delete the e-mail
> and its attachments from all computers.
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RE: Does tomcat support multicores
Posted by "Caldarale, Charles R" <Ch...@unisys.com>.
> From: Christopher Schultz [mailto:chris@christopherschultz.net]
> Subject: Re: Does tomcat support multicores
>
> | Doesn't XP limit itself to two cores?
>
> I don't think so.
I'm sure some versions of XP are limited to two CPUs, since that was a
concern when HyperThreading was all the rage. It may be just the Home
edition, rather than Pro. I know the Windows Server versions (different
license than XP) all support at least four CPUs.
- Chuck
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Re: Does tomcat support multicores
Posted by Christopher Schultz <ch...@christopherschultz.net>.
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Chuck,
Caldarale, Charles R wrote:
|> From: Caldarale, Charles R
|> Subject: RE: Does tomcat support multicores
|>
|>> From: James Law [mailto:JLaw@generic-software.com]
|>> Subject: Does tomcat support multicores
|>>
|>> Hi I'm running a tomcat server, and would like to know if Tomcat can
|>> make use of multiple cores?
|> Of course - assuming your JVM does
|
| And your OS. Doesn't XP limit itself to two cores?
I don't think so. And if it does, it certainly does different things
based upon the packaging of the OS you got -- like "server" versus
"home" or whatever.
- -chris
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RE: Does tomcat support multicores
Posted by "Caldarale, Charles R" <Ch...@unisys.com>.
> From: Caldarale, Charles R
> Subject: RE: Does tomcat support multicores
>
> > From: James Law [mailto:JLaw@generic-software.com]
> > Subject: Does tomcat support multicores
> >
> > Hi I'm running a tomcat server, and would like to know if Tomcat can
> > make use of multiple cores?
>
> Of course - assuming your JVM does
And your OS. Doesn't XP limit itself to two cores?
- Chuck
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RE: Does tomcat support multicores
Posted by "Caldarale, Charles R" <Ch...@unisys.com>.
> From: James Law [mailto:JLaw@generic-software.com]
> Subject: Does tomcat support multicores
>
> Hi I'm running a tomcat server, and would like to know if Tomcat can
> make use of multiple cores?
Of course - assuming your JVM does (and any modern JVM does - but you
didn't bother to mention which one you're using).
The fact that you're not seeing much CPU utilization simply means your
tests are limited by something else, such as I/O or database access.
- Chuck
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Re: Does tomcat support multicores
Posted by Christopher Schultz <ch...@christopherschultz.net>.
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James,
James Law wrote:
| We use a program called WAPT to ramp up the amount of requests sent
| to Tomcat, probably not the best way going off what has been said. It
| got to the point were it the Java process never go above 25% cpu
| usage while the memory usage increases accordingly. Which is why I
| assumed it would not making proper use of the cores. Currently using
| Java 1.6.
How many concurrent connections was that relative to the maximum
connections your <Connector> will accept? It's possible you've just
exhausted your connection pool, and the machine simply will not accept
more work to do.
This is a good position to be in ;)
- -chris
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Re: Does tomcat support multicores
Posted by Dan Armbrust <da...@gmail.com>.
What kind of work is Tomcat doing for each request that WAPT sends in?
For example, if you were doing something that had to go back to a
database, and you had a bad sync block in your code somewhere, or
didn't have enough connections in your DB pool, that could cause it to
behave like it is single threaded - because all of the threads / cores
are contending for some shared resource.
Or, if you are just serving pages, perhaps you are disk bound, and
your disk drive just isn't fast enough.
Or, perhaps you have reached the limit of how much load WAPT can generate.
There are lots of avenues to explore here, but they are all
implementation specific.
Dan
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RE: Does tomcat support multicores
Posted by James Law <JL...@generic-software.com>.
We use a program called WAPT to ramp up the amount of requests sent to Tomcat, probably not the best way going off what has been said.
It got to the point were it the Java process never go above 25% cpu usage while the memory usage increases accordingly. Which is why I assumed it would not making proper use of the cores.
Currently using Java 1.6.
-----Original Message-----
From: Christopher Schultz [mailto:chris@christopherschultz.net]
Sent: 28 February 2008 16:03
To: Tomcat Users List
Subject: Re: Does tomcat support multicores
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James,
James Law wrote:
| Os - WinXP
|
| CPU - Intel Quad Core
|
| Hi I'm running a tomcat server, and would like to know if Tomcat can
| make use of multiple cores? When I max the server out, all 4 cores see
| little usage however the java process never uses more than 25%.
Sounds like you haven't really maxed-out your server. What is your
definition of "maxed-out"?
| So this makes me believe that Tomcat does not make use of a multicore
| system.
Just like most hardware resource questions in Tomcat, it all comes down
to the JVM + the OS. Tomcat itself neither enables nor disables this
capability. The JVM supports multiple threads. The OS supports threads.
Presumably, the OS is smart enough to allow threads from a single
process to run on any CPU (or core).
| Would I benefit from running more than one instance and setup load
| bearing between the two?
Probably not. I would venture a guess that you are seeing appropriate
resource usage for your load scenario. What does "maxed-out" mean, and
why do you think you are in that state? Can you see which processor(s)
is(are) running java.exe (or whatever) processes, or are you just
looking at the overall CPU-usage meter and seeing that it shows 25%
total CPU usage? There's also the possibility that your application is
I/O-bound instead of CPU bound, meaning that the CPU is spending most of
the time waiting around for data to move around instead of performing
calculations and whatnot. That wouldn't be a surprise given that network
transfer speeds are relatively slow compared to bus speeds and the rate
at which your CPU(s) can process information.
- -chris
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RE: Does tomcat support multicores
Posted by "Baron, Bob (LNG-HBE)" <Bo...@lexisnexis.com>.
It works just fine!
My guess would be that the load you're putting on it is single threaded, so there's only a single thread executing on the server. You're really only asking it to do one thing at a time.
Make sure that you're running multiple concurrent loads.
-----Original Message-----
From: Christopher Schultz [mailto:chris@christopherschultz.net]
Sent: Thursday, February 28, 2008 11:03 AM
To: Tomcat Users List
Subject: Re: Does tomcat support multicores
-----BEGIN PGP SIGNED MESSAGE-----
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James,
James Law wrote:
| Os - WinXP
|
| CPU - Intel Quad Core
|
| Hi I'm running a tomcat server, and would like to know if Tomcat can
| make use of multiple cores? When I max the server out, all 4 cores see
| little usage however the java process never uses more than 25%.
Sounds like you haven't really maxed-out your server. What is your
definition of "maxed-out"?
| So this makes me believe that Tomcat does not make use of a multicore
| system.
Just like most hardware resource questions in Tomcat, it all comes down
to the JVM + the OS. Tomcat itself neither enables nor disables this
capability. The JVM supports multiple threads. The OS supports threads.
Presumably, the OS is smart enough to allow threads from a single
process to run on any CPU (or core).
| Would I benefit from running more than one instance and setup load
| bearing between the two?
Probably not. I would venture a guess that you are seeing appropriate
resource usage for your load scenario. What does "maxed-out" mean, and
why do you think you are in that state? Can you see which processor(s)
is(are) running java.exe (or whatever) processes, or are you just
looking at the overall CPU-usage meter and seeing that it shows 25%
total CPU usage? There's also the possibility that your application is
I/O-bound instead of CPU bound, meaning that the CPU is spending most of
the time waiting around for data to move around instead of performing
calculations and whatnot. That wouldn't be a surprise given that network
transfer speeds are relatively slow compared to bus speeds and the rate
at which your CPU(s) can process information.
- -chris
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Re: Does tomcat support multicores
Posted by Christopher Schultz <ch...@christopherschultz.net>.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
James,
James Law wrote:
| Os - WinXP
|
| CPU - Intel Quad Core
|
| Hi I'm running a tomcat server, and would like to know if Tomcat can
| make use of multiple cores? When I max the server out, all 4 cores see
| little usage however the java process never uses more than 25%.
Sounds like you haven't really maxed-out your server. What is your
definition of "maxed-out"?
| So this makes me believe that Tomcat does not make use of a multicore
| system.
Just like most hardware resource questions in Tomcat, it all comes down
to the JVM + the OS. Tomcat itself neither enables nor disables this
capability. The JVM supports multiple threads. The OS supports threads.
Presumably, the OS is smart enough to allow threads from a single
process to run on any CPU (or core).
| Would I benefit from running more than one instance and setup load
| bearing between the two?
Probably not. I would venture a guess that you are seeing appropriate
resource usage for your load scenario. What does "maxed-out" mean, and
why do you think you are in that state? Can you see which processor(s)
is(are) running java.exe (or whatever) processes, or are you just
looking at the overall CPU-usage meter and seeing that it shows 25%
total CPU usage? There's also the possibility that your application is
I/O-bound instead of CPU bound, meaning that the CPU is spending most of
the time waiting around for data to move around instead of performing
calculations and whatnot. That wouldn't be a surprise given that network
transfer speeds are relatively slow compared to bus speeds and the rate
at which your CPU(s) can process information.
- -chris
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Re: Does tomcat support multicores
Posted by Filip Hanik - Dev Lists <de...@hanik.com>.
tomcat is core agnostic, it lets the JVM handle it, and the answer is
yes, most JVMs will support multi core machines
Filip
James Law wrote:
> Os - WinXP
>
> CPU - Intel Quad Core
>
> Hi I'm running a tomcat server, and would like to know if Tomcat can
> make use of multiple cores? When I max the server out, all 4 cores see
> little usage however the java process never uses more than 25%.
>
> So this makes me believe that Tomcat does not make use of a multicore
> system.
>
> Would I benefit from running more than one instance and setup load
> bearing between the two?
>
> Thanks
>
> James Law
>
>
>
>
> ****************************************************************************
>
> Search all of our current vacancies at www.generic-software.com
>
> ****************************************************************************
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> should not copy, distribute or disclose its contents to other parties.
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> Software Consultants Ltd or any of its affiliates. No reliance may be
> placed on this message without written confirmation from an authorised
> company representative, and no actions should be taken based on its
> contents.
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> St. Andrews House, Caldecotte Lake Drive, Caldecotte Business Park,
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