Hi All
Thanks.
I also agree lowering MaxRequestsPerChild will keep busy apache in killing
and recreating child process. I dont know what Math i worked, i reconfigured
both of the apache instances on the server with following -
<IfModule worker.c>
ServerLimit 200
StartServers 2
MaxClients 1000
MinSpareThreads 75
MaxSpareThreads 250
ThreadsPerChild 25
MaxRequestsPerChild 20000
</IfModule>
KeepAliveTimeout 5
There was rise in load, teh system snapshot is -
[r...@cinschpr35 root]# top
5:46pm up 257 days, 7:09, 5 users, load average: 5.70, 5.31, 5.15
614 processes: 606 sleeping, 8 running, 0 zombie, 0 stopped
CPU0 states: 98.2% user, 1.1% system, 0.0% nice, 0.1% idle
CPU1 states: 99.4% user, 0.0% system, 0.0% nice, 0.1% idle
CPU2 states: 99.4% user, 0.1% system, 0.0% nice, 0.0% idle
CPU3 states: 98.4% user, 1.0% system, 0.0% nice, 0.0% idle
Mem: 3927672K av, 3922000K used, 5672K free, 5196K shrd, 1363088K
buff
Swap: 1048536K av, 736K used, 1047800K free 2112964K
cached
PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME
COMMAND
32006 apache0 25 0 6796 6796 4092 R 99.8 0.1
213:21 httpd
2306 apache0 25 0 6624 6624 4100 R 99.4 0.1
136:42 httpd
2298 apache0 25 0 6624 6624 4100 R 97.2 0.1
135:39 httpd
2308 apache0 25 0 6624 6624 4100 R 95.4 0.1
135:05 httpd
17059 tomcat1 15 0 82432 80M 9932 S 1.1 2.0
9:10 java
14678 tomcat0 15 0 101M 101M 31464 S 1.1 2.6
6:32 java
16228 root 15 0 1488 1488 836 R 1.1
0.0 0:00 top
19850 tomcat1 15 0 82432 80M 9932 S 0.9 2.0
6:16 java
1110 tomcat0 15 0 101M 101M 31464 S 0.5 2.6
10:19 java
23605 tomcat0 15 0 101M 101M 31464 S 0.5 2.6
7:31 java
#free -m
total used free shared buffers cached
Mem: 3835 3828 7 5 1335 2059
-/+ buffers/cache: 433 3402
Swap: 1023 0 1023
procs memory swap
io system cpu
r b w swpd free buff cache si so bi bo
in cs us sy id
5 0 1 736 8236 1367124 2108452 0 0 1 12 3 1 11
5 13
4 0 0 736 8156 1367132 2108460 0 0 0 172 370 404 98
2 0
4 0 1 736 8172 1367132 2108468 0 0 0 0 281 309 99
1 0
4 0 1 736 8168 1367132 2108480 0 0 0 162 288 366 100
0 0
5 0 1 736 8128 1367132 2108488 0 0 0 0 287 342 99
1 0
4 0 1 736 8136 1367132 2108496 0 0 0 148 286 322 100
1 0
5 0 1 736 8180 1367132 2108504 0 0 0 0 275 332 98
2 0
4 0 2 736 8148 1367132 2108512 0 0 0 10 267 326 99
1 0
4 0 1 736 8184 1367136 2108520 0 0 0 190 288 357 99
1 0
4 0 0 736 8104 1367136 2108536 0 0 0 10 298 404 99
1 0
4 0 2 736 7980 1367140 2108540 0 0 0 254 332 414 99
1 0
4 0 0 736 7968 1367140 2108548 0 0 0 20 286 408 98
2 0
5 0 1 736 7972 1367140 2108560 0 0 0 0 346 418 99
1 0
4 0 1 736 7992 1367144 2108568 0 0 0 216 315 371 100
0 0
5 0 0 736 8004 1367144 2108576 0 0 0 0 285 358 100
0 0
5 0 0 736 7956 1367144 2108588 0 0 0 158 333 392 100
0 0
6 0 2 736 7928 1367144 2108596 0 0 0 0 326 383 99
1 0
6 0 2 736 8064 1367144 2108604 0 0 0 0 291 356 100
0 0
4 0 0 736 8056 1367148 2108616 0 0 0 180 301 376 99
1 0
4 0 1 736 8016 1367148 2108624 0 0 0 34 335 413 99
1 0
Above, i can see two things happened-
1> in "top" output teh httpd process eating CPU has high "TIME" value. why?
2> the vmstat output value of "r" increases. Why?
Thanks in advance
Kulbir
On Fri, Mar 13, 2009 at 6:38 PM, Tadeu Alves <[email protected]> wrote:
> i forget the other stuff i'm using moodle with some images werving with
> eaccelerator running with php and i you want i can send a conf file about
> mysql, php and apache if you would like to.
>
> On Fri, Mar 13, 2009 at 2:45 PM, Anthony J. Biacco <
> [email protected]> wrote:
>
>> 1. I have to rail totally against this. The more you lower
>> MaxRequestsPerChild, the more often apache is killing and recreating a child
>> process. At numbers as low as 2000 or lower, you’re starting to defeat the
>> whole purpose of using the worker mpm.
>>
>> >=50% of apache’s time is going to be spent managing child processes on a
>> high traffic site. MaxRequestsPerChild should either be 0 or something very
>> high. IF your process memory usage gets higher and higher, then you have a
>> memory leak somewhere.
>>
>> 2. Don’t use ThreadLimit, stick with ThreadsPerChild
>>
>> 3. You MaxClients doesn’t sync up to your other numbers. MaxClients is
>> going to be ServerLimit x ThreadsPerChild. So for you, 1500. If you want to
>> serve 1500 concurrent reqs, then set MaxClients to match this at 1500. If
>> you want 500, then change ServerLimit,StartServers and ThreadsPerChild so
>> the math is right. For instance, ServerLimit 10, StartServers 5,
>> ThreadsPerChild 50 will be you a MaxClients of 500.
>>
>> If you give us your server parameters (cpu, memory, modules loaded, apache
>> rss usage, types of files served), we’d be able to better recommend numbers
>> for what your server can support.
>>
>>
>>
>> -Tony
>>
>> ---------------------------
>>
>> Manager, IT Operations
>>
>> Format Dynamics, Inc.
>>
>> 303-573-1800x27
>>
>> [email protected]
>>
>> http://www.formatdynamics.com
>>
>>
>>
>> *From:* Tadeu Alves [mailto:[email protected]]
>> *Sent:* Friday, March 13, 2009 8:45 AM
>> *To:* [email protected]
>> *Subject:* Re: [us...@httpd] Apache Tunning
>>
>>
>>
>> nice one. Getting on this hook, in my server we run moodle i dunno if you
>> guys know about it and a very high hits/second i wan't to know if going down
>> about MaxRequestsPerChild 500 will be good to performance and any idea about
>> changing my server variables to make it support more concurrent connections
>>
>>
>>
>> ########################################
>>
>> <IfModule worker.c>
>> ServerLimit 30
>> ThreadLimit 70
>> StartServers 20
>> MaxClients 500
>> MinSpareThreads 10
>> MaxSpareThreads 15
>> ThreadsPerChild 50
>> MaxRequestsPerChild 2000
>> MaxMemFree 5000
>> #ReceiveBufferSize 714400 (not using anymore)
>>
>>
>>
>> #################################
>>
>>
>>
>>
>>
>> On Fri, Mar 13, 2009 at 5:41 AM, Gaurav Khambhala <[email protected]>
>> wrote:
>>
>> Hi Kulbir,
>>
>>
>>
>> Gaurav wrote:
>>
>> Tadeu Alves wrote:
>>
>> i thibk that you can down the variable
>> MaxRequestsPerChild 20000 to 2000 it's too much and if the child process
>> keeps the request well i't grows bigger and bigger in memory
>>
>>
>> Even 2000 is too much. Various high load,high traffic servers also don't
>> have this much high value.
>>
>>
>>
>> Found this: http://rimuhosting.com/howto/memory.jsp may be useful to you.
>>
>>
>>
>>
>> --
>> Cheers,
>>
>>
>> Gaurav Khambhala
>> i-hack-at-DeepRoot Linux
>> Getting GNU/Linux to work for you. Faster. Better. Today. Every way.
>> http://www.deeproot.in, +91 80 4089 0000
>>
>>
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>>
>
>
