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Message-ID: <41AF3C58.3050603@uk.radan.com>
Date: Thu, 02 Dec 2004 16:01:28 +0000
From: Steve Hay <steve.hay@uk.radan.com>
User-Agent: Mozilla Thunderbird 0.9 (Windows/20041103)
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To: Perrin Harkins <perrin@elem.com>
CC: Stas Bekman <stas@stason.org>, mod_perl Dev <dev@perl.apache.org>
Subject: Re: plans for mp2.0.0 release schedule
References: <41AE8C9D.1080003@stason.org> <41AEF4D5.4070504@uk.radan.com>
 <41AF323A.4040300@elem.com>
In-Reply-To: <41AF323A.4040300@elem.com>
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Perrin Harkins wrote:

>Steve Hay wrote:
>  
>
>>If I switch to mp2 then the Perl interpreter is now multi-threaded, thus 
>>removing the performance bottleneck, which should be great except for 
>>one thing:  All our mp code involves DBI (& DBD-mysql), but DBI is not 
>>thread-safe!
>>    
>>
>
>I thought DBI was thread-safe at this point.  It's more likely 
>DBD::mysql that is not.
>  
>
There are quite possibly problems with DBD-mysql too, but DBI-1.46 pod 
does say:

"Using DBI with perl threads is not yet recommended for production 
environments."

See:  http://search.cpan.org/~timb/DBI-1.46/DBI.pm#Threads_and_Thread_Safety

>  
>
>>Is there a way to configure mp2 to build with a non-threaded Perl, or at 
>>least to run it in such a way as to not make use of the Perl 
>>interpreter's threads, in order to simulate mp1-style behaviour?
>>    
>>
>
>Sure, see 
>http://perl.apache.org/docs/2.0/user/config/config.html#Threads_Mode_Specific_Directives
>
>Just tell it to start a single Perl interpreter, and you will still get 
>apache threads without perl that handle static stuff.
>
>Of course I haven't tried this stuff personally on win32, but you can 
>grab the latest mp2 and try it out yourself.
>
I think this is what Stas was also saying, but thanks for the link.

- Steve


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