Comments on: Load Testing With Log Replay

By: Ilya Grigorik

Ilya Grigorik — Wed, 30 Sep 2009 14:57:58 +0000

Ah, yes good catch! Bumped heads with that one before as well.

By: Mathieu Martin

Mathieu Martin — Wed, 30 Sep 2009 13:14:48 +0000

Ah, crap, you’re right, I meant num-conns. I always confuse num-conns and num-calls :-)

My point was that having a log with 1000 URIs and passing the “wlog” argument was not enough to have httperf hit the 1000 URIs. You had to specify num-conns explicitly or it defaulted to only hitting one URI, the first one in the log.

By: Ilya Grigorik

Ilya Grigorik — Wed, 30 Sep 2009 00:09:18 +0000

Mathieu, as far as I remember, num-calls specifies the number of requests that the test will issue per connection. In the past, I’ve explicitly set it to 1 to try and mock / overload the server with concurrent independent requests. However, it all depends on your use case.

By: Mathieu Martin

Mathieu Martin — Tue, 29 Sep 2009 20:30:27 +0000

Thanks for posting Ilya.

The manual test run* of httperf with the –wlog option wasn’t working for me. It was only actually sending 1 request to the server, instead of a bunch.

The solution: explicitly pass –num-calls=1000 to httperf.

* meaning this line:
httperf --hog --server localhost --port 80 --wlog=n,requests_httperf.log --rate=100
had to become:
httperf --hog --server localhost --port 80 --wlog=n,requests_httperf.log --rate=100 --num-calls=1000

I’m using httperf 0.9.0 on Leopard.

By: Solution Hacker - Load and stress testing my website

Solution Hacker - Load and stress testing my website — Tue, 27 Jan 2009 09:17:56 +0000

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By: Jannis

Jannis — Fri, 16 Jan 2009 09:18:04 +0000

Good stuff!

Just a tiny correction: ‘httperf_num-call = 1′ should probably read ‘httperf_num-calls = 1′ in autoperf.conf (at least on my system and the docs).

And for those who get connreset errors, set num-calls to 1 - the reason might be the fact that your server does not support persistent connections (just so there’s a solution to this problem in google ;)

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India Ganges River India Kashmir - River India Travel — Wed, 05 Nov 2008 13:04:37 +0000

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By: Load Testing with log replay « faisal.ahmed

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By: Infakta

Infakta — Sun, 19 Oct 2008 15:44:02 +0000

Very usefull artice!

By: Ilya Grigorik

Ilya Grigorik — Thu, 16 Oct 2008 03:31:48 +0000

Jan, Vincent: just spent some time playing with Tsung, and I’m thoroughly impressed, thanks for the great tip! It definitely has a high entry barrier in terms of configuration, but the feature set definitely makes it a worthwhile investment.