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From Philippe Mouawad <philippe.moua...@gmail.com>
Subject Re: High CPU utilization in JMeter 3.x with HttpClient 4 leads to freeze
Date Wed, 01 Feb 2017 09:39:19 GMT
Could you provide the Heap Dump on drive ?
Thanks

On Wed, Feb 1, 2017 at 10:07 AM, Tuukka Mustonen <tuukka.mustonen@gmail.com>
wrote:

> Oh, and I did try nightly build. It did not have effect.
>
> The dumps were created in JMeter 3.1 that I assume should be more stable
> than the nightly.
>
> Tuukka
>
>
> On Wed, Feb 1, 2017 at 10:55 AM, Tuukka Mustonen <
> tuukka.mustonen@gmail.com>
> wrote:
>
> > Hi, I'm running solely on Win 10 now. In re-attempts I think I saw
> > slightly different behavior in my Linux guest. I'll write more about that
> > later, but for simplicity I'm testing only on Windows host now:
> >
> > Thread dumps are downloadable at: https://drive.google.com/
> drive/folders/
> > 0B1uBdVuLED5NS1RFbEFuSS1iejA
> >
> > (Took them with 7-8s interval I think, hope it's ok).
> >
> > I took the thread dumps once JMeter started filling in errors, which is
> > somewhat after my CPU usage hit 100% (and music playback started to
> distort
> > etc.).
> >
> > I also created the head dump, note that I took it after running the test
> > and after restarting JMeter, as JMeter froze during the test and I had to
> > kill it. DId you mean I should take it *during* the test? Anyway, before
> > sharing it I want to make sure it can't contain anything confidential?
> > (parts of my test plan, passwords, environment variables, anything...)
> >
> > Tuukka
> >
> >
> >
> > On Wed, Feb 1, 2017 at 10:10 AM, UBIK LOAD PACK Support <
> > support@ubikloadpack.com> wrote:
> >
> >> Hello,
> >> To investigate the problem:
> >> 1/ to create  thread dumps, install a JDK of same version as the one
> >> running your JMeter.
> >>
> >> Run until you get the problem, then call using same user as the one
> >> running
> >> JMeter 3 times at 5s interval:
> >>  <jdk_home>/bin/jstack -l <pid of JMeter> >> output_file.txt
> >>
> >> It will also help if you provide the structure of your Test Plan.
> >>
> >> 2/ It would also help if you can provide a Heap Dump. With JMeter GUI,
> use
> >> menu Help > Create a Heap Dump
> >> This will create a Heap Dump (rather big file) , it would help a lot if
> >> you
> >> can make it available.
> >>
> >> Regards
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >> On Wed, Feb 1, 2017 at 9:03 AM, Tuukka Mustonen <
> >> tuukka.mustonen@gmail.com>
> >> wrote:
> >>
> >> > @Philippe:
> >> >
> >> > Yeah, I am normally running in non-GUI mode, but to
> >> > study/inspect/understand this problem I am running in GUI mode. JMeter
> >> 2.13
> >> > works just fine in GUI mode for these tests so JMeter 3.x should too.
> >> >
> >> > I'll give the nightly build a try.
> >> >
> >> > Tuukka
> >> >
> >> >
> >> > On Wed, Feb 1, 2017 at 9:59 AM, Philippe Mouawad <
> >> > philippe.mouawad@gmail.com
> >> > > wrote:
> >> >
> >> > > On Wednesday, February 1, 2017, Tuukka Mustonen <
> >> > tuukka.mustonen@gmail.com
> >> > > >
> >> > > wrote:
> >> > >
> >> > > > @Philippe:
> >> > > >
> >> > > > 1. Yeah, I compared them with the same plan, same machine. Should
> be
> >> > > > everything equal.
> >> > > > 2. I tried both the defaults in jmeter.bat (-Xms512m -Xmx512m)
and
> >> as
> >> > > > slightly increased (-Xms512m -Xmx1024m). I didn't tweak them
much
> >> > > because I
> >> > > > don't believe the issue lies there.
> >> > > > 3. No, I do just simple HTTP GETs (against RESTy API).
> >> > > > 4. I am not familiar with that but I can try. If you have
> >> instructions
> >> > to
> >> > > > point to, please do.
> >> > >
> >> > >
> >> > >
> >> > >
> >> > > > 5. I am running with GUI.
> >> > >
> >> > >
> >> > > This is a known anti-pattern .
> >> > > switch to non gui mode if you want correct results.
> >> > > http://jmeter.apache.org/usermanual/best-practices.html
> >> > >
> >> > > http://www.ubik-ingenierie.com/blog/jmeter_performance_tuning_tips/
> >> > >
> >> > >
> >> > > > About file sending:
> >> > > >
> >> > > > 6. Nope. I'm just doing simple GETs.
> >> > >
> >> > >  Could you give nightly build a try ?
> >> > > http://jmeter.apache.org/nightly.html
> >> > >
> >> > >
> >> > > > Tuukka
> >> > > >
> >> > > >
> >> > > > On Wed, Feb 1, 2017 at 9:43 AM, Philippe Mouawad <
> >> > > > philippe.mouawad@gmail.com <javascript:;>
> >> > > > > wrote:
> >> > > >
> >> > > > > Also are you sending files in post body ?
> >> > > > >
> >> > > > > Thank you
> >> > > > >
> >> > > > > On Wednesday, February 1, 2017, Philippe Mouawad <
> >> > > > > philippe.mouawad@gmail.com <javascript:;>>
> >> > > > > wrote:
> >> > > > >
> >> > > > > > Hello,
> >> > > > > > Few questions, please try to answer them all:
> >> > > > > >
> >> > > > > > 1/ Did you compare 2.13 and 3.1 with same plan/sape
machine...
> >> > > > everything
> >> > > > > > equal ?
> >> > > > > > 2/ What are your Xmx settings
> >> > > > > > 3/ does your plan download embedded resources ?
> >> > > > > > 4/ when issue happens can you make 3 thread dumps at
5 seconds
> >> > > interval
> >> > > > > > and send file ? (use jstack)
> >> > > > > > 5/ are you running gui or non gui ?
> >> > > > > >
> >> > > > > > Thanks
> >> > > > > > Regards
> >> > > > > >
> >> > > > > > On Wednesday, February 1, 2017, Tuukka Mustonen <
> >> > > > > tuukka.mustonen@gmail.com <javascript:;>
> >> > > > > > <javascript:_e(%7B%7D,'cvml','tuukka.mustonen@gmail.com
> >> > > <javascript:;>');>>
> >> > > > wrote:
> >> > > > > >
> >> > > > > >> Hi,
> >> > > > > >>
> >> > > > > >> After upgrading to JMeter 3.0 or 3.1 I experience
high CPU
> >> usage
> >> > > that
> >> > > > > >> renders JMeter unusable. CPU usage ramps quickly
up and after
> >> > having
> >> > > > > >> ~100-200 concurrent users or so (in ~30 seconds),
it hits
> 100%
> >> on
> >> > my
> >> > > > > >> i7-4600. Shortly after, whole JMeter freezes and
I have to
> kill
> >> > it.
> >> > > > > >>
> >> > > > > >> On 2.13 everything goes smoothly (with default
settings). CPU
> >> > usage
> >> > > > > stays
> >> > > > > >> at ~30% even with 500 users.
> >> > > > > >>
> >> > > > > >> The experience is similar on both Windows 10 and
Linux
> (Ubuntu
> >> > 14.04
> >> > > > LTS
> >> > > > > >> guest in Virtualbox).
> >> > > > > >>
> >> > > > > >> The problems I saw in JMeter 3:
> >> > > > > >>
> >> > > > > >> - java.net.SocketException: Permission denied:
connect
> >> > > > > >> - After a while it runs out of heap space
> >> > > > > >>
> >> > > > > >> For "Permission denied: connect" I tried to set
> >> > > > > >> java.net.preferIPv4Stack=true
> >> > > > > >> (in a few places to make sure it would really be
in use) and
> >> tried
> >> > > to
> >> > > > > run
> >> > > > > >> JMeter as administrator (in Win). No effect.
> >> > > > > >>
> >> > > > > >> I also tried increasing heap size, but that didn't
help
> either.
> >> > And
> >> > > I
> >> > > > > >> think
> >> > > > > >> memory size is not the root cause here - rather
the result.
> >> > > > > >>
> >> > > > > >> I am normally connected to VPN but I also tried
disabling it.
> >> No
> >> > > > effect.
> >> > > > > >>
> >> > > > > >> I tried disabling with and without IPv6 enabled
in Windows
> >> network
> >> > > > > >> connection settings. No effect.
> >> > > > > >>
> >> > > > > >> I am running a few extra JMeter plugins. Tried
cutting my
> test
> >> > > > scenario
> >> > > > > to
> >> > > > > >> minimum. No effect.
> >> > > > > >>
> >> > > > > >> I am running anti-virus software that I cannot
disable, due
> to
> >> > this
> >> > > > > being
> >> > > > > >> forced by IT department. However, it's not a problem
with
> 2.13
> >> so
> >> > I
> >> > > > > assume
> >> > > > > >> it shouldn't be a problem here either.
> >> > > > > >>
> >> > > > > >> FINALLY, once I set HTTP request implementation
from Apache
> >> > > > HttpClient 4
> >> > > > > >> to
> >> > > > > >> HttpClient 3.1 or JAVA, the problem vanishes -
CPU stays
> where
> >> it
> >> > > did
> >> > > > > with
> >> > > > > >> JMeter 2.13.
> >> > > > > >>
> >> > > > > >> I'm running Oracle JVM 8 (update 121 on Win, update
111 on
> >> Linux).
> >> > > > > >>
> >> > > > > >> Why does (the recommended) HttpClient 4 cause problems
here?
> Is
> >> > > this a
> >> > > > > >> know
> >> > > > > >> bug/issue? JMeter 3.x is running newer version
compared to
> >> 2.13,
> >> > but
> >> > > > > what
> >> > > > > >> change in HttpClient 4 might cause the problems
described?
> >> > > > > >>
> >> > > > > >> Any ideas?
> >> > > > > >>
> >> > > > > >> Regards,
> >> > > > > >> Tuukka
> >> > > > > >>
> >> > > > > >
> >> > > > > >
> >> > > > > > --
> >> > > > > > Cordialement.
> >> > > > > > Philippe Mouawad.
> >> > > > > >
> >> > > > > >
> >> > > > > >
> >> > > > > >
> >> > > > >
> >> > > > > --
> >> > > > > Cordialement.
> >> > > > > Philippe Mouawad.
> >> > > > >
> >> > > >
> >> > >
> >> > >
> >> > > --
> >> > > Cordialement.
> >> > > Philippe Mouawad.
> >> > >
> >> >
> >>
> >
> >
>



-- 
Cordialement.
Philippe Mouawad.

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