ab (Apache Bench) error: apr_poll: The timeout specified has expired (70007) on Windows

Question

I'm load testing IIS 7.5 (WinR2/SP1) from my Windows 7/SP1 client. I have a script that makes three ab calls like:

start /B cmd /c ab.exe -k -n 500 -c 50 http://rhvwr2vsu410/HelloWebAPI/Home/SyncProducts > SyncProducts.txt

When the concurrency is > 5, I soon get the error message

apr_poll: The timeout specified has expired (70007)

And ab stops making requests. I don't even get to Completed 100 requests.

This happens within 30 seconds of starting my script. The ab documentation page doesn't provide much. Related Stack Overflow question. Server Fault related question .

A similar thing happened to me as well. The problem was related to my code. Not sure if this is the case here, though. — tugberk, Apr 17 '12 at 07:38
@tugberk - exactly, a bug in my WebApi code limited concurrency. As soon as I fixed the bug the apr_poll message went away. — RickAndMSFT, Apr 21 '12 at 01:15
You can try the solution given in this thread: http://serverfault.com/questions/10852/what-limits-the-maximum-number-of-connections-on-a-linux-server — Sivaraman Viswanathan, Sep 03 '12 at 09:20
I think this question is old, but I am still getting this problem from the command line, e.g. `ab http://myinternalserver.tld/file.txt` but it works when I add `-X 127.0.0.1:8888` to go through my local debug proxy and it works using curl. Any clues? — jacobq, Mar 11 '14 at 20:34

Dzwiedziu-nkg · Answer 1 · 2021-09-28T11:25:32.877

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You must have the 2.4 version and use -s timeout option.

Edit:

https://www.wampserver.com/ - includes Apache 2.4.x Win32 and Win64.

Deprecated ~~but still available however I not known until when~~ and just not available:

You can use my win32-x86 binary (compiled under Visual Studio 2008 from trunk 8 Feb 2013):

~~http://mars.iti.pk.edu.pl/~nkg/ab-standalone.exe~~ (no longer available)
~~http://mars.iti.pk.edu.pl/~nkg/ab-standalone-src.zip~~ (no longer available)

I was made it using: http://code.google.com/p/apachebench-standalone/wiki/HowToBuild and http://ftp.ps.pl/pub/apache//apr/binaries/win32/apr-1.3.6-iconv-1.2.1-util-1.3.8-win32-x86-msvcrt60.zip (just not available).

edited Sep 28 '21 at 11:25

answered Feb 08 '13 at 17:51

Dzwiedziu-nkg

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The stand-alone exe complains that "libapr-1.dll" is missing. – Uwe Keim Feb 10 '13 at 08:46
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And with a 2.2 version use the -t timelimit option – Ponytech May 13 '13 at 13:52
If you can't download or it's not working, please inform me instead of downvote. – Dzwiedziu-nkg Jan 12 '14 at 20:06
Some lib is probably missing, but it is working when ab-standalone.exe is executed from apache22/bin (so it requires apache 2.2 installation). – rafalmag Nov 12 '14 at 11:11
@Dzwiedziu-nkg Hi! I wonder where can i find the version 2.4 you mentioned. I did `apt-get install apache2-utils` and it installed 2.3 by default. I hope 2.4 can save me from the agonizing. – yeehaw Jul 21 '21 at 03:22
@yeehaw what is your distro? Must be very old. 2.4 was released in 2012. – Dzwiedziu-nkg Sep 28 '21 at 11:30
@Dzwiedziu-nkg It is a ubuntu 18.04 machine. Not sure how is Linux different... – yeehaw Oct 02 '21 at 23:03

score 17 · Answer 2 · answered Jul 29 '15 at 08:44

17

ab --help 

-s timeout      Seconds to max. wait for each response
                    Default is 30 seconds

Add option: -s 120 to ab command, Where 120 is new timeout. If it is not enough set it even higher...

answered Jul 29 '15 at 08:44

smentek

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Anurag jain · Answer 3 · 2017-09-04T14:34:02.603

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ab --help

-s      timeout      Seconds to max. wait for each response
                    Default is 30 seconds

-k                    Use HTTP KeepAlive feature

It works for me

edited Sep 04 '17 at 14:34

answered Feb 03 '16 at 10:04

Anurag jain

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score 8 · Answer 4 · edited Jul 01 '14 at 15:46

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Sounds like an ab bug.

I had a similar problem on OS X (now that you mention it happens on Windows, I feel more confident that ab is the culprit). I went around profiling and tracing my web application, but couldn't find anything. I then tested static pages off of nginx, and it still gave me the error. So I then went and found a replacement... jMeter. Works great, but I would still like to know what the ab problem is.

edited Jul 01 '14 at 15:46

iconoclast

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answered Jan 13 '13 at 15:13

Matt

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I'm wondering the same. In my situation I'm using high concurrency and the failure isn't reproducible, but consistently -n minus 2. e.g. ab -c 500 -n 10000 => 9998 complete, 2 timeout. Maybe related: https://bz.apache.org/bugzilla/show_bug.cgi?id=22686 – Cory Mawhorter Mar 31 '15 at 19:47

ab (Apache Bench) error: apr_poll: The timeout specified has expired (70007) on Windows

4 Answers4