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From Sergio Boso <ser...@bosoconsulting.it>
Subject RE: not all 50 http samplers to download file are executed
Date Sun, 08 Nov 2015 09:09:27 GMT
Hi Charles,

If I remember well, if you check the "save MD5 only", the full data is not
kept in memory.
You can check that data are data correct and you save substantial amount of
memory.
Other approach may involve OS sampler and wget operation.

Regards

Sergio Boso
Il 08/Nov/2015 07:24, "Charles Lin (charlin)" <charlin@cisco.com> ha
scritto:

> I changed my script from 1 Thread Group with 50 users, to 50 Thread Group
> each with 1 user.  Well, it does not do what I want which is concurrent
> downloading.
>
> Thread Group 2 does not start until Thread Group 1 finishes, which in this
> case means a long wait for one 310 MB to complete download, before next
> Thread Group (= next downloading) can begin.
>
> So either I have to increase heap memory even more, or use two or three
> machines to run JMeter so as to get 50 concurrent downloads.
>
> If you have other good suggestions please let me know.
>
> Thank you!
>
> Charles
>
> -----Original Message-----
> From: Charles Lin (charlin)
> Sent: Saturday, November 07, 2015 9:39 PM
> To: JMeter Users List
> Subject: RE: not all 50 http samplers to download file are executed
>
> Hi Deepak,
>
> Thank you for your response.
>
> After I submitted my question, I started analyzing the logs, and as you
> suspected, the problem was java out of heap memory
>
> I increased my JVM_ARG to -Xms=4096- Xmx=8000, and was able to get more
> files download to complete.  But still, I only got 20 out of 50 total
> download that I had hoped for.
>
> Is there some timer or timing arrangement with my sampler arrangement
> under the Thread Group that I can play with to overcome this heap memory
> issue?
>
> How about instead of a single Thread Group with 5 HTTPS samplers under it
> (the first 4 leading up to the 5th which is the actual file downloading
> request), right now I run this Thread Group with User = 50, Ramp = 100 sec,
> cycle = 1 ... instead of that, what if I make them into 5 separate Thread
> Group, each thread group with User = 1, Ramp=1, cycle =1.    Will I be able
> to launch all 50 Thread Groups sequentially but quickly, one after
> another?   For each Thread Group, like I said, 5 samplers are needed to
> cause the download to begin.    All 5 executes quickly, but the 5th request
> will take time to finish (for 310 MB to download).  But as soon as Group
> 1-5 is done (but downloading now in progress), will Group 2-1 ~ 2-5 start
> to execute?
>
> Will doing the above help to release the heap memory?   In other words, as
> Thread 1-5 finish dumping data to local file, that memory will be freed for
> following succession of Thread 2-5, 3-5, 4-5, 5-5, 6-5, etc to use while
> they also finish up dumping data to file?
>
> Thank you
>
> Charles
>
>
>
>
> 2015/11/07 18:43:25 DEBUG - jmeter.threads.ThreadGroup: Ending thread
> Thread Group 1-1
> 2015/11/07 18:43:30 ERROR - jmeter.threads.JMeterThread: Test failed!
> java.lang.OutOfMemoryError: Java heap space
>
> 2015/11/07 18:43:31 ERROR - jmeter.threads.JMeterThread: Test failed!
> java.lang.OutOfMemoryError: Java heap space
>
> 2015/11/07 18:43:31 INFO  - jmeter.threads.JMeterThread: Thread finished:
> Thread Group 1-40
> 2015/11/07 18:43:30 ERROR - jmeter.threads.JMeterThread: Test failed!
> java.lang.OutOfMemoryError: Java heap space
>         at java.io.ByteArrayOutputStream.<init>(Unknown Source)
>         at
> org.apache.jmeter.protocol.http.sampler.HTTPSamplerBase.readResponse(HTTPSamplerBase.java:1741)
>         at
> org.apache.jmeter.protocol.http.sampler.HTTPAbstractImpl.readResponse(HTTPAbstractImpl.java:412)
>         at
> org.apache.jmeter.protocol.http.sampler.HTTPHC4Impl.sample(HTTPHC4Impl.java:352)
>         at
> org.apache.jmeter.protocol.http.sampler.HTTPSamplerProxy.sample(HTTPSamplerProxy.java:74)
>         at
> org.apache.jmeter.protocol.http.sampler.HTTPSamplerBase.sample(HTTPSamplerBase.java:1146)
>         at
> org.apache.jmeter.protocol.http.sampler.HTTPSamplerBase.sample(HTTPSamplerBase.java:1135)
>         at
> org.apache.jmeter.threads.JMeterThread.process_sampler(JMeterThread.java:434)
>         at
> org.apache.jmeter.threads.JMeterThread.run(JMeterThread.java:261)
>         at java.lang.Thread.run(Unknown Source)
>
>
> -----Original Message-----
> From: Deepak Shetty [mailto:shettyd@gmail.com]
> Sent: Saturday, November 07, 2015 8:11 PM
> To: JMeter Users List
> Subject: Re: not all 50 http samplers to download file are executed
>
> Did you check jmeter.log for errors like out of memory ?
> On Nov 7, 2015 1:11 PM, "Charles Lin (charlin)" <charlin@cisco.com> wrote:
>
>
>

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