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Re: Performance issue system swap partition.



On 03/09/07, nilesh vaghela <nileshj vaghela 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 gmail com> wrote:
> >
> > On 03/09/07, nilesh vaghela <nileshj vaghela 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
> >
> > --
> > redhat-list mailing list
> > unsubscribe mailto:redhat-list-request redhat com?subject=unsubscribe
> > https://www.redhat.com/mailman/listinfo/redhat-list
> >
>
>
>
> --
> 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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