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 <tadeu...@gmail.com> 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 < > abia...@formatdynamics.com> 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 >> >> abia...@formatdynamics.com >> >> http://www.formatdynamics.com >> >> >> >> *From:* Tadeu Alves [mailto:tadeu...@gmail.com] >> *Sent:* Friday, March 13, 2009 8:45 AM >> *To:* users@httpd.apache.org >> *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 <gau...@deeproot.co.in> >> 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 >> >> >> --------------------------------------------------------------------- >> The official User-To-User support forum of the Apache HTTP Server Project. >> See <URL:http://httpd.apache.org/userslist.html> for more info. >> To unsubscribe, e-mail: users-unsubscr...@httpd.apache.org >> " from the digest: users-digest-unsubscr...@httpd.apache.org >> For additional commands, e-mail: users-h...@httpd.apache.org >> >> >> > >