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Message-ID: <20081113191241.GB14953@csews22.cse.iitk.ac.in> Date: Thu, 13 Nov 2008 19:12:43 +0000 From: Rahul Pydimukkala <prahul@....iitk.ac.in> To: kyle <kylewong@...tha.com> Cc: linux-kernel@...r.kernel.org Subject: Re: apache threads not balanced over all CPU cores, schedular problem or apache? Few of the cores are always left idle by default for power saving reasons. There has been a discussion over it sometime back. http://lkml.org/lkml/2008/6/25/326 That helps you play around with the load-balancer. - Rahul On 19:46 Thu 13 Nov , kyle wrote: > From: "Rahul Pydimukkala" <prahul@....iitk.ac.in> > To: "kyle" <kylewong@...tha.com> > Cc: <linux-kernel@...r.kernel.org> > Sent: Thursday, November 13, 2008 10:34 PM > Subject: Re: apache threads not balanced over all CPU cores, schedular > problem or apache? > > > >On 12:58 Thu 13 Nov , kyle wrote: > >>Hi, > >> > >>Please cc me if possible. > >> > >>I have a machine with Intel Q9300 4-core CPU, 8GB RAM. It runs apache > >>2.0.63 > >>with traditional prefork MPM. > > > >Yes, this is quite undesirable given that the kernel has a good > >load-balancer. Can you give more information regarding the kernel version > >and load stats of individual apache processes as well? > >- > >Rahul > > > > They now all load on cpu1 and cpu2. > > top - 19:35:42 up 8 days, 22:36, 8 users, load average: 1.77, 1.63, 1.75 > Tasks: 251 total, 2 running, 249 sleeping, 0 stopped, 0 zombie > Cpu0 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, > 0.0%st > Cpu1 : 14.1%us, 4.4%sy, 0.0%ni, 52.9%id, 27.2%wa, 0.0%hi, 1.5%si, > 0.0%st > Cpu2 : 4.3%us, 2.9%sy, 0.0%ni, 92.3%id, 0.0%wa, 0.0%hi, 0.5%si, > 0.0%st > Cpu3 : 0.5%us, 0.5%sy, 0.0%ni, 98.0%id, 1.0%wa, 0.0%hi, 0.0%si, > 0.0%st > Mem: 8117172k total, 8029032k used, 88140k free, 373356k buffers > Swap: 208824k total, 8576k used, 200248k free, 5884936k cached > > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ P COMMAND > 15112 nobody 20 0 199m 10m 7344 S 2.5 0.1 0:00.94 2 httpd > 14488 nobody 20 0 208m 17m 8400 S 2.0 0.2 0:02.06 1 httpd > 15184 nobody 20 0 203m 12m 7652 S 2.0 0.2 0:00.69 1 httpd > 15320 nobody 20 0 199m 9736 6556 S 2.0 0.1 0:00.29 2 httpd > 15466 nobody 20 0 201m 9424 4684 S 2.0 0.1 0:00.05 2 httpd > 15204 nobody 20 0 201m 10m 7380 S 1.5 0.1 0:00.66 2 httpd > 15051 nobody 20 0 203m 12m 7716 S 1.0 0.2 0:01.43 2 httpd > 15059 nobody 20 0 204m 13m 9232 S 1.0 0.2 0:01.22 2 httpd > 15081 nobody 20 0 203m 12m 7724 S 1.0 0.2 0:00.95 2 httpd > 15319 nobody 20 0 202m 12m 6376 S 1.0 0.2 0:00.26 1 httpd > 15465 nobody 20 0 199m 8448 5396 S 1.0 0.1 0:00.05 2 httpd > 15467 nobody 20 0 200m 8872 4568 S 1.0 0.1 0:00.02 2 httpd > 12215 nobody 20 0 202m 13m 9756 S 0.5 0.2 0:05.54 2 httpd > 13052 nobody 20 0 205m 14m 9.8m S 0.5 0.2 0:04.36 2 httpd > 13433 nobody 20 0 203m 14m 9564 S 0.5 0.2 0:05.25 1 httpd > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@...r.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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