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From Digvijoy Chatterjee <digvijo...@gmail.com>
Subject Re: [users@httpd] apache problems with number of cgi requests
Date Sat, 01 Aug 2009 18:34:25 GMT
Ok so mod_status helped me make an interesting observation :

There is only one child picking up the request for sleep.cgi when i
launch it new in new tabs/ new windows, rest are children all waiting,
and picking the next requests when this one gets done .

Srv	PID	Acc	M	CPU 	SS	Req	Conn	Child	Slot	Client	VHost	Request
0-0	20815	0/0/0	W 	0.00	0	684599440	0.0	0.00	0.00
	127.0.0.1	127.0.1.1	GET /server-status HTTP/1.1
1-0	20816	0/0/0	W 	0.00	36	684635474	0.0	0.00	0.00
	127.0.0.1	127.0.1.1	GET /cgi-bin/sleep.cgi HTTP/1.1

However clicking that one link on the page again and again launches up
new processes with no restraint. here below ( same link clicked again
and again )
and the same child pid is responsible for launching up new instances
of sleep.cgi ( 20815, 20816 )

0-0	20815	0/0/0	W 	0.00	7	684077228	0.0	0.00	0.00
	127.0.0.1	127.0.1.1	GET /cgi-bin/sleep.cgi HTTP/1.1
0-0	20815	0/0/0	W 	0.00	6	684076661	0.0	0.00	0.00
	127.0.0.1	127.0.1.1	GET /cgi-bin/sleep.cgi HTTP/1.1
0-0	20815	0/0/0	W 	0.00	5	684076206	0.0	0.00	0.00
	127.0.0.1	127.0.1.1	GET /cgi-bin/sleep.cgi HTTP/1.1
1-0	20816	1/1/1	W 	0.00	7	0	0.1	0.00	0.00 	127.0.0.1	127.0.1.1	GET
/cgi-bin/sleep.cgi HTTP/1.1
1-0	20816	0/0/0	W 	0.00	6	684076898	0.0	0.00	0.00
	127.0.0.1	127.0.1.1	GET /cgi-bin/sleep.cgi HTTP/1.1
1-0	20816	0/0/0	W 	0.00	6	684076442	0.0	0.00	0.00
	127.0.0.1	127.0.1.1	GET /cgi-bin/sleep.cgi HTTP/1.1
1-0	20816	0/0/0	W 	0.00	0	684070224	0.0	0.00	0.00
	127.0.0.1	127.0.1.1	GET /server-status HTTP/1.1

The apache conf , I have attached here.


Let me know , what else could help

Thanks
Digz

On Wed, Jul 29, 2009 at 8:52 AM, Chandranshu .<chandranshu@gmail.com> wrote:
> Hi Digz
>
> Meanwhile, when you say that "apache will not service any other CGI
> requests", what exactly do you mean? Did you mean that your further HTTP
> requests returned with 503 or some other error code? Or do they just wait
> around for a long time before returning any data?
>
> You should enable mod_status with "ExtendedStatus On" and check whether your
> requests are taken up for processing by the httpd server. Please send the
> output generated by mod_status along with the apache config if your problem
> remains unsolved.
>
> Best of Luck
> Chandranshu
>
> On Wed, Jul 29, 2009 at 5:41 PM, Digvijoy Chatterjee <digvijoy.c@gmail.com>
> wrote:
>>
>> Hi,
>>
>> We are running apache 2.0.35 on RHEL4 running in prefork mode.
>> Its a standard apache configuration for running cgi scripts. I can
>> send it if required
>>
>> The behaviour we are observing with apache is after servicing 2 cgi
>> requests which (do a long database lookup ~5 minutes)
>> apache will not service any other cgi requests until one of the above come
>> back.
>>
>> I have tried using RLimitNPROC, RlimitCPU , and RLimitMEM and even set
>> them to max,
>> but it does not affect the behavior.
>>
>> apache runs as www.
>>
>> Any clues ?
>>
>> --Digz
>>
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>
>

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