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From Ruediger Pluem <rpl...@apache.org>
Subject Re: Problem with file descriptor handling in httpd 2.3.1
Date Sun, 04 Jan 2009 14:56:14 GMT


On 01/04/2009 03:48 PM, Rainer Jung wrote:
> On 04.01.2009 15:40, Ruediger Pluem wrote:
>>
>> On 01/04/2009 03:26 PM, Rainer Jung wrote:
>>> On 04.01.2009 14:14, Ruediger Pluem wrote:
>>>> On 01/04/2009 11:24 AM, Rainer Jung wrote:
>>>>> On 04.01.2009 01:51, Ruediger Pluem wrote:
>>>>>> On 01/04/2009 12:49 AM, Rainer Jung wrote:
>>>>>>> On 04.01.2009 00:36, Paul Querna wrote:
>>>>>>>> Rainer Jung wrote:
>>>>>>>>> During testing 2.3.1 I noticed a lot of errors of type
EMFILE:
>>>>>>>>> "Too
>>>>>>>>> many open files". I used strace and the problem looks
like this:
>>>>>>>>>
>>>>>>>>> - The test case is using ab with HTTP keep alive, concurrency
20
>>>>>>>>> and a
>>>>>>>>> small file, so doing about 2000 requests per second.
>>>>>> What is the exact size of the file?
>>>>> It is the index.html, via URL /, so size is 45 Bytes.
>>>> Can you try if you run in the same problem on 2.2.x with a file of
>>>> size 257 bytes?
>>> I tried on the same type of system with event MPM and 2.2.11. Can't
>>> reproduce even with content file of size 257 bytes.
>>
>> Possibly you need to increase the number of threads per process with
>> event MPM
>> and the number of concurrent requests from ab.
> 
> I increased the maximum KeepAlive Requests and the KeepAlive timeout a
> lot and during a longer running test I see always exactly as many open
> FDs for the content file in /proc/PID/fd as I had concurrency in ab. So
> it seems the FDs always get closed before handling the next request in
> the connection.
> 
> After testing the patch, I'll try it again with 257 bytes on 2.2.11 with
> prefork or worker.

IMHO this cannot happen with prefork on 2.2.x. So I guess it is not worth testing.
It still confuses me that this happens on trunk as it looks like that ab does not
do pipelining.

Regards

RĂ¼diger


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