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List:       apache-test-dev
Subject:    Re: getting rid of 'server reached MaxClients setting' error
From:       Stas Bekman <stas () stason ! org>
Date:       2004-04-28 18:21:40
Message-ID: 408FF634.7080708 () stason ! org
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gregames@apache.org wrote:
> Stas Bekman wrote:
> 
>> I think this misleading error is really a bug in Apache:
> 
> 
> I agree.
> 
>> [Mon Apr 26 15:28:44 2004] [error] server reached MaxClients setting, 
>> consider raising the MaxClients setting
>>
>> It sounds like a one-off bug to me. It reports that error when the 
>> number of workers is the same as MaxClients, 
> 
> 
> it's worse than that, I think.
> 
>>    which is perfectly fine. It should only report a problem when a new 
>> request is coming in and there are no free servers/threads to handle 
>> the request.
> 
> 
> I've seen this recently while experimenting with event driven I/O built 
> on top of the worker MPM.  It seems to happen when the parent is trying 
> to increase the number of child processes but they haven't initialized 
> yet and the server is temporarily out of worker threads.  I didn't see 
> the number of active workers reach MaxClients.  Re-examining the test 
> that leads to the message:
> 
>     else if (idle_thread_count < min_spare_threads) {   <== cool
>         /* terminate the free list */
>         if (free_length == 0) {                         <== insufficient
> 
> I'm a little rusty on this code, but looks like free_length is increased 
> when the code finds a process with at least one worker thread with 
> SERVER_DEAD state in the scoreboard.  I don't see where it checks for 
> MaxClients.

Thanks, Greg. Am I right to say that you now have an itch to scratch and get 
it solved? :)

__________________________________________________________________
Stas Bekman            JAm_pH ------> Just Another mod_perl Hacker
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