trace replay feature and cookies

Ragavan Ambighananthan aragavan at
Wed Jul 20 14:36:55 UTC 2011

Thanks for yor response Dmitry.
The polygraph version is 4.4.0.

Well, even though I am using real urls, I have a config line (cache_peer  parent 9090 0 no-query originserver) in our squid proxy
which will fetch contents from WP server instead of live sites.

-----Original Message-----
From: Dmitry Kurochkin <dmitry.kurochkin at>
To: aragavan at
Cc: users at
Subject: Re: trace replay feature and cookies
Date: Wed, 20 Jul 2011 18:20:57 +0400

Hi Ragavan.

On Wed, 20 Jul 2011 14:58:18 +0100, Ragavan Ambighananthan <aragavan at> wrote:
> Hi 
> I am using the trace replay functionality of web polygraph and I am
> using urls from our production access logs.
> However, at some point WP client aborts with the following emssage.
> 025.69| fyi: changing populus factor level from 9.17% to 9.26%
> 025.69| script output: small sample mean response time is 148msec
> (s0) Success
> assertion failed: '!info.cookies'
> Aborted
> Is this anything related to cookies and how to stop this from
> happening ?

This is definitely a bug.  I opened bug #813532 [1] for this problem.

Do I understand it correctly that Polygraph clients talk to foreign
servers (i.e. real web servers on the internet)?  If that is the case,
the bug may be that some replies have cookies and Polygraph client does
not expect it.  But this is just a guess.

Unfortunately, I can not provide you a workaround until I investigate
the issue further.

Can you please add Web Polygraph version information to the bug report?
Other additional info may be useful as well.



> I have attached the work load I was using. Any help would be
> appreciated.
> Regds
> Ragavan

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