Performance issue system swap partition.
Herta Van den Eynde
herta.vandeneynde at gmail.com
Wed Sep 5 14:22:47 UTC 2007
On 03/09/07, nilesh vaghela <nileshj.vaghela at gmail.com> wrote:
> The output is taken Load ave is @ 12
>
> 14:45:01 up 12 days, 17:17, 2 users, load average: 12.67, 7.47, 4.96
> 209 processes: 191 sleeping, 5 running, 13 zombie, 0 stopped
> CPU states: cpu user nice system irq softirq iowait idle
> total 167.2% 0.0% 25.8% 0.0% 4.8% 1.8% 0.0%
> cpu00 87.5% 0.0% 11.5% 0.0% 0.0% 0.9% 0.0%
> cpu01 79.8% 0.0% 14.4% 0.0% 4.8% 0.9% 0.0%
> Mem: 1024780k av, 1009004k used, 15776k free, 0k shrd, 44236k
> buff
> 753664k actv, 141752k in_d, 15680k in_c
> Swap: 1999992k av, 259808k used, 1740184k free 552548k
> cached
>
> PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM CTIME CPU COMMAND
> 25064 apache 16 0 14360 12M 3928 S 39.6 1.2 0:04 1 httpd
> 25034 apache 23 0 61008 41M 4020 R 38.6 4.1 1:41 1 httpd
> 14118 apache 21 0 15680 13M 3980 R 25.1 1.3 0:32 0 httpd
> 23292 apache 16 0 15364 14M 3964 S 24.1 1.4 0:08 1 httpd
> 28441 apache 16 0 13988 12M 3916 S 16.4 1.2 0:01 0 httpd
> 7446 apache 16 0 15008 13M 3988 S 6.7 1.3 0:51 0 httpd
>
>
> ]# cat /proc/meminfo
> total: used: free: shared: buffers: cached:
> Mem: 1049374720 1033097216 16277504 0 49688576 682455040
> Swap: 2047991808 258445312 1789546496
> MemTotal: 1024780 kB
> MemFree: 15896 kB
> MemShared: 0 kB
> Buffers: 48524 kB
> Cached: 557884 kB
> SwapCached: 108576 kB
> Active: 752936 kB
> ActiveAnon: 422212 kB
> ActiveCache: 330724 kB
> Inact_dirty: 142708 kB
> Inact_laundry: 28612 kB
> Inact_clean: 13916 kB
> Inact_target: 187632 kB
> HighTotal: 130432 kB
> HighFree: 1192 kB
> LowTotal: 894348 kB
> LowFree: 14704 kB
> SwapTotal: 1999992 kB
> SwapFree: 1747604 kB
> CommitLimit: 2512380 kB
> Committed_AS: 799608 kB
> HugePages_Total: 0
> HugePages_Free: 0
> Hugepagesize: 2048 kB
>
>
> On 9/3/07, Herta Van den Eynde <herta.vandeneynde at gmail.com> wrote:
> >
> > On 03/09/07, nilesh vaghela <nileshj.vaghela at gmail.com> wrote:
> > > We have RHEL 3 running groupware horde with around 400 users.
> > >
> > > output of the top is like
> > >
> > > 11:56:24 up 12 days, 14:29, 3 users, load average: 17.56, 13.86,
> > 17.18
> > > 215 processes: 211 sleeping, 1 running, 3 zombie, 0 stopped
> > > CPU states: cpu user nice system irq softirq iowait idle
> > > total 133.8% 0.0% 15.6% 0.0% 0.0% 50.0% 0.0%
> > > cpu00 66.7% 0.0% 8.1% 0.0% 0.0% 25.0% 0.0%
> > > cpu01 67.1% 0.0% 7.5% 0.0% 0.1% 25.0% 0.0%
> > > Mem: 1024780k av, 1007952k used, 16828k free, 0k shrd, 16804k
> > > buff
> > > 752416k actv, 142348k in_d, 17892k in_c
> > > Swap: 1999992k av, 286856k used, 1713136k free 548700k
> > > cached
> > >
> > > PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM CTIME CPU
> > COMMAND
> > > 27403 postgres 17 0 18932 18M 17512 S 36.8 1.8 0:01 0
> > postmaster
> > > 22027 apache 20 0 14064 13M 3948 S 9.9 1.3 0:06 1 httpd
> > > 9730 apache 16 0 15556 14M 4032 S 9.7 1.4 0:23 0 httpd
> > > 15890 apache 19 0 15504 14M 4016 S 6.3 1.4 0:18 1 httpd
> > > 7907 apache 18 0 15128 14M 4024 S 5.3 1.4 0:14 1 httpd
> > > 19281 apache 15 0 15324 14M 3984 S 2.9 1.4 0:12 1 httpd
> > > 8 root 15 0 0 0 0 SW 1.7 0.0 43:14 0 kscand
> > > 26073 apache 16 0 13784 12M 3912 S 1.7 1.2 0:01 1 httpd
> > > 26056 apache 16 0 14588 13M 3928 S 1.5 1.3 0:01 0 httpd
> > > 26152 amish.sh 15 0 1152 1112 1020 D 1.5 0.1 0:05 0 imap
> > > 19330 apache 15 0 15120 13M 3968 S 1.3 1.3 0:12 1 httpd
> > > 21861 apache 16 0 14568 13M 3952 S 1.3 1.3 0:05 1 httpd
> > > 22028 apache 15 0 14228 12M 3964 S 1.1 1.2 0:08 1 httpd
> > > 21860 apache 15 0 14436 13M 3964 S 0.9 1.3 0:06 0 httpd
> > >
> > > --------
> > >
> > > #free -m
> > > total used free shared buffers
> > cached
> > > Mem: 1000 985 15 0
> > 16 584
> > > -/+ buffers/cache: 384 616
> > > Swap: 1953 262 1691
> > > # iostat
> > > Linux 2.4.21-47.0.1.ELsmp (mailserver) 09/03/2007
> > >
> > > avg-cpu: %user %nice %sys %idle
> > > 8.62 0.00 1.67 89.72
> > >
> > > Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn
> > > dev8-0 51.10 2174.61 528.74 2031403260 493924264
> > > dev8-1 20.50 1051.40 1106.51 982162050 1033642680
> > >
> > >
> > > Why it is consuming so high swap even the free memory is there ???
> > >
> > > The io wait consume almost all the cpu power. ??
> > >
> > >
> > > --
> > > Nilesh Vaghela
> > > ElectroMech
> > > Redhat Channel Partner and Training Partner
> > > 74, Nalanda Complex, Satellite Rd, Ahmedabad
> > > 25, The Emperor, Fatehgunj, Baroda.
> > > www.electromech.info
> >
> > Could you post the output of 'cat /proc/meminfo', please?
> >
> > Kind regards,
> >
> > Herta
> >
> > --
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> >
>
>
>
> --
> Nilesh Vaghela
> ElectroMech
> Redhat Channel Partner and Training Partner
> 74, Nalanda Complex, Satellite Rd, Ahmedabad
> 25, The Emperor, Fatehgunj, Baroda.
> www.electromech.info
What does 'sysctl vm.min_free_kbytes' return? My guess is that it is
close to your free memory.
If, in the meantime, you want to find out which processes are using
swap, you can find them using 'top'. Start top, then press f,
followed by p and <Enter>. You should now see an extra field headed
'SWAP'. If you now press 'M', you will order processes by memory
usage.
Hope this helps.
Kind regards,
Herta
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