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From: ghazel@gmail.com
To: unicorn list <mongrel-unicorn@rubyforge.org>
Subject: Re: Kernel.srand after_fork
Date: Fri, 28 Jan 2011 02:57:23 -0800	[thread overview]
Message-ID: <AANLkTi=oxD_J1dsE2iM35S2Y=Wc+6-mwFk5gC1n6K1n=@mail.gmail.com> (raw)
In-Reply-To: <20110128102649.GB25922@dcvr.yhbt.net>

On Fri, Jan 28, 2011 at 2:26 AM, Eric Wong <normalperson@yhbt.net> wrote:
> ghazel@gmail.com wrote:
>> Hi,
>> We recently noticed random numbers from the Unicorn workers were
>> turning up lots of duplicates across requests. Is it possible that the
>> random seed generated when the ruby interpreter starts is duplicated
>> when the workers are forked, and not re-seeded after fork?
>> If so, should I call Kernel.srand in after_fork, or is this something
>> which should be added to Unicorn?
> It looks like a 1.8 bug, which version of Ruby are you running?  Ruby
> 1.9.1 actually had a bug where it was reseeded improperly and led to
> segfaults (see KNOWN_ISSUES).  1.9.2 is fine afaik.

REE 1.8.7

So, calling Kernel.srand in after_fork will fix the 1.8 bug and the
1.9.1 bug and work fine on 1.9.2?

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  reply	other threads:[~2011-01-28 10:57 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-01-28  9:57 Kernel.srand after_fork ghazel
2011-01-28 10:26 ` Eric Wong
2011-01-28 10:57   ` ghazel [this message]
2011-01-28 17:51     ` Eric Wong
2011-01-28 18:14       ` Eric Wong

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