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Posted to user@jmeter.apache.org by "Christensen, Alan" <al...@hp.com> on 2006/11/03 23:34:25 UTC
Simulating network latency in Jmeter?
Is there a mechanism that simulates network latency in Jmeter? I want
to be able to measure the response times that will be experienced by
users who are a long ways from the website.
Re: Simulating network latency in Jmeter?
Posted by sebb <se...@gmail.com>.
It should be fairly easy to enhance the code to calculate an
additional delay per request.
Would that solve your problem?
S.
On 07/11/06, Christensen, Alan <al...@hp.com> wrote:
> Hi Sebb-
>
> I was afraid that that the "characters per second" mechanism for
> simulating slow bandwidth links was the only thing available. Although
> this mechanism does probably work by inserting delays, it really doesn't
> properly simulate network latency. The actual delay in response time
> that would be incurred for a transaction using the cps mechanism would
> be directly proportional to filesize and nothing else. The proper delay
> incurred for network latency effects would be dependent upon the actual
> number of serialized request/reply or acknowledgement cycles that
> occurred during a particular transaction. For example, a user in
> Australia with 400ms of round trip network latency to a server in Texas
> would incur at least one 400ms latency penalty in downloading a page.
> This latency penalty would be independent of the users "last mile"
> bandwidth. A user in Texas with 30ms of network latency would incur at
> least one 30ms latency. The number of latencies that worldwide users
> would incur would be the same for a particular transaction, but the
> number might be different for different transactions. I don't want to
> analyze each transaction to see how many latencies are incurred for each
> one, so I wanted to simulate this effect in jmeter. Unfortunately it
> sounds like there isn't a built in mechanism to do so.
>
> Thanks,
>
> Alan
>
>
>
> -----Original Message-----
> From: sebb [mailto:sebbaz@gmail.com]
> Sent: Tuesday, November 07, 2006 6:32 AM
> To: JMeter Users List
> Subject: Re: Simulating network latency in Jmeter?
>
> If you use the HTTPClient HTTP Sampler, you can set up the connection to
> behave like a slow modem - see the comments in jmeter.properties.
>
> S.
> On 07/11/06, Michal Kaczmarzyk <Mi...@comarch.com> wrote:
> >
> > Try to use Uniform Random Timer in your test plan.
> >
> > -----Original Message-----
> > From: Christensen, Alan [mailto:alan.christensen@hp.com]
> > Sent: Friday, November 03, 2006 11:34 PM
> > To: JMeter Users List
> > Subject: Simulating network latency in Jmeter?
> >
> >
> > Is there a mechanism that simulates network latency in Jmeter? I want
>
> > to be able to measure the response times that will be experienced by
> > users who are a long ways from the website.
> >
> >
> > --
> > Empowering business
> > http://webinars.comarch.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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RE: Simulating network latency in Jmeter?
Posted by "Christensen, Alan" <al...@hp.com>.
Hi Sebb-
I was afraid that that the "characters per second" mechanism for
simulating slow bandwidth links was the only thing available. Although
this mechanism does probably work by inserting delays, it really doesn't
properly simulate network latency. The actual delay in response time
that would be incurred for a transaction using the cps mechanism would
be directly proportional to filesize and nothing else. The proper delay
incurred for network latency effects would be dependent upon the actual
number of serialized request/reply or acknowledgement cycles that
occurred during a particular transaction. For example, a user in
Australia with 400ms of round trip network latency to a server in Texas
would incur at least one 400ms latency penalty in downloading a page.
This latency penalty would be independent of the users "last mile"
bandwidth. A user in Texas with 30ms of network latency would incur at
least one 30ms latency. The number of latencies that worldwide users
would incur would be the same for a particular transaction, but the
number might be different for different transactions. I don't want to
analyze each transaction to see how many latencies are incurred for each
one, so I wanted to simulate this effect in jmeter. Unfortunately it
sounds like there isn't a built in mechanism to do so.
Thanks,
Alan
-----Original Message-----
From: sebb [mailto:sebbaz@gmail.com]
Sent: Tuesday, November 07, 2006 6:32 AM
To: JMeter Users List
Subject: Re: Simulating network latency in Jmeter?
If you use the HTTPClient HTTP Sampler, you can set up the connection to
behave like a slow modem - see the comments in jmeter.properties.
S.
On 07/11/06, Michal Kaczmarzyk <Mi...@comarch.com> wrote:
>
> Try to use Uniform Random Timer in your test plan.
>
> -----Original Message-----
> From: Christensen, Alan [mailto:alan.christensen@hp.com]
> Sent: Friday, November 03, 2006 11:34 PM
> To: JMeter Users List
> Subject: Simulating network latency in Jmeter?
>
>
> Is there a mechanism that simulates network latency in Jmeter? I want
> to be able to measure the response times that will be experienced by
> users who are a long ways from the website.
>
>
> --
> Empowering business
> http://webinars.comarch.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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Re: Simulating network latency in Jmeter?
Posted by sebb <se...@gmail.com>.
If you use the HTTPClient HTTP Sampler, you can set up the connection
to behave like a slow modem - see the comments in jmeter.properties.
S.
On 07/11/06, Michal Kaczmarzyk <Mi...@comarch.com> wrote:
>
> Try to use Uniform Random Timer in your test plan.
>
> -----Original Message-----
> From: Christensen, Alan [mailto:alan.christensen@hp.com]
> Sent: Friday, November 03, 2006 11:34 PM
> To: JMeter Users List
> Subject: Simulating network latency in Jmeter?
>
>
> Is there a mechanism that simulates network latency in Jmeter? I want to be
> able to measure the response times that will be experienced by users who are
> a long ways from the website.
>
>
> --
> Empowering business
> http://webinars.comarch.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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Re: (Actual) Time taken to load a page
Posted by sebb <se...@gmail.com>.
Not possible currently, as JMeter does not support parallel downloads
in a single thread.
You could get an estimate of the minumum time required by taking the
maximum download time for all the component parts. But you will have
to do this calculation yourself.
On 07/11/06, Indraneel Chowdhury <in...@induslogic.com> wrote:
> This may be a newbie question, but I haven't found a good answer for this
> yet. Say, there is a page that has a some css, js, gif and png components,
> along with an aspx component. When JMeter executes, even if these requests
> may have been sent one after the other, we may get the responses in
> parallel. So how would I calculate the total time taken to load the page (
> which is actually made up by the sum of these components)? It cannot be the
> sum of the times taken to load the individual components because of the
> parallelism in the responses coming back from the web-server. Any help would
> be greatly appreciated.
>
> Thanks and regards
> Neel
>
>
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>
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(Actual) Time taken to load a page
Posted by Indraneel Chowdhury <in...@induslogic.com>.
This may be a newbie question, but I haven't found a good answer for this
yet. Say, there is a page that has a some css, js, gif and png components,
along with an aspx component. When JMeter executes, even if these requests
may have been sent one after the other, we may get the responses in
parallel. So how would I calculate the total time taken to load the page (
which is actually made up by the sum of these components)? It cannot be the
sum of the times taken to load the individual components because of the
parallelism in the responses coming back from the web-server. Any help would
be greatly appreciated.
Thanks and regards
Neel
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RE: Simulating network latency in Jmeter?
Posted by Michal Kaczmarzyk <Mi...@comarch.com>.
Try to use Uniform Random Timer in your test plan.
-----Original Message-----
From: Christensen, Alan [mailto:alan.christensen@hp.com]
Sent: Friday, November 03, 2006 11:34 PM
To: JMeter Users List
Subject: Simulating network latency in Jmeter?
Is there a mechanism that simulates network latency in Jmeter? I want to be
able to measure the response times that will be experienced by users who are
a long ways from the website.
--
Empowering business
http://webinars.comarch.com
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