[horde] Problem of slow with server-side sorting
Jose Luis Marin Perez
jolumape_al at hotmail.com
Fri Jun 5 16:46:31 UTC 2009
> Date: Fri, 5 Jun 2009 10:02:28 +0200
> From: lst_hoe02 at kwsoft.de
> To: horde at lists.horde.org
> Subject: Re: [horde] Problem of slow with server-side sorting
>
> Zitat von Jose Luis Marin Perez <jolumape_al at hotmail.com>:
>
> >
> >> Date: Thu, 4 Jun 2009 09:27:21 +0200
> >> From: rsalmon at mbpgroup.com
> >> To: jolumape_al at hotmail.com
> >> CC: horde at lists.horde.org
> >> Subject: RE: [horde] Problem of slow with server-side sorting
> >>
> >>
> >> Jose Luis Marin Perez <jolumape_al at hotmail.com> a écrit :
> >>
> >> > Thanks for your answers.
> >> >
> >> > These hardware features:
> >> >
> >> > ML370 G4
> >> > Xeon 3.6 GHz CPU
> >> > 1 GB RAM
> >> > Hard Drive 300GB - Raid 1 - EXT3
> >> SAS or SATA ?
> >> did you disable atime on ext3 (Maildirs disk) ?
> >>
> >> > When accessing one of these accounts capture a sample of the TOP
> >> > command
> >> >
> >> > top - 09:37:51 up 4 days, 15:26, 2 users, load average: 5.07,
> >> > 4.85, 4.79
> >> > Tasks: 146 total, 1 running, 145 sleeping, 0 stopped, 0
> >> > zombie
> >> > Cpu(s): 46.5% us, 19.8% sy, 0.0% ni, 19.8% id, 13.9% wa, 0.0%
> >> > hi, 0.0% si
> >> > Mem: 1034512k total, 1008464k used, 26048k free,
> >> > 55592k buffers
> >> > Swap: 2048276k total, 143232k used, 1905044k free,
> >> > 516016k cached
> >>
> >> You definitely need more RAM! The load is pretty high. What is the
> >> running process?
> >>
> >> > On our server there are about 5000 mail accounts with more than
> >> > 1000 messages per account.
> >> >
> >> > As can enable an option _imp_hook_msglist_format and that benefits
> >> > could give me to solve my problem?
> >>
> >> The fact that we have the hook _imp_hook_msglist_format enabled really
> >> slow down accessing mailboxes (especially if they contains lots of
> >> emails) has IMP reads the content of each email to see if there are
> >> any attachments.
> >>
> >>
> >> Jose, can you reply after the message(instead of before)? It is easier
> >> to keep track of the discussion. thanks.
> >>
> >> Ronan.
> >
> > Dear Ronan,
> >
> > The server has 300GB SCSI RAID 1 - Ext3
> >
> > Ext3 is the default has not changed anything in the configuration,
> > this would help?
> >
> > Based on your experience as it should increase the RAM?
> >
> > This is an example of TOP to see the process:
> >
> > top - 09:46:33 up 5 days, 15:35, 2 users, load average: 10.59, 13.92, 12.80
> > Tasks: 175 total, 2 running, 173 sleeping, 0 stopped, 0 zombie
> > Cpu(s): 36.1% us, 8.9% sy, 0.0% ni, 13.9% id, 41.1% wa, 0.0% hi, 0.0% si
> > Mem: 1034512k total, 1005808k used, 28704k free, 76620k buffers
> > Swap: 2048276k total, 163040k used, 1885236k free, 441280k cached
> >
> > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
> > 3184 mysql 15 0 886m 55m 2664 S 32.6 5.5 1732:33 mysqld
> > 3760 daemon 16 0 22640 9.9m 4224 S 27.7 1.0 0:01.36 httpd
> > 29351 daemon 16 0 28124 15m 4724 S 11.9 1.5 0:10.13 httpd
> > 30238 daemon 16 0 22992 10m 4488 S 10.9 1.0 0:02.63 httpd
>
> Your MySQL Database is bogged down and you should consider using a PHP
> accelerator. The "wait" percentage is high, this could be a sign of
> overloaded disk I/O. Check what is doing most of I/O. It *may* be
> MySQL so have a look why.
>
> Regards
>
> Andreas
>
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Thanks for your response,
I increased the RAM to 2 GB and there is a small increase to improve service.
Based on the commentary of Andreas, I have noticed through IOSTAT (%
util) the Disk I / O is high and reaches 100 when using any of these
webmail accounts that have more than 1500 messages
avg-cpu: %user %nice %sys %iowait %idle
52.87 0.00 20.20 17.96 8.98
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm %util
cciss/c0d0 2.01 194.97 58.29 34.67 1861.31 1837.19 930.65 918.59 39.78 1.83 19.82 7.95 73.87
cciss/c0d0p1
0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
cciss/c0d0p2
0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
cciss/c0d0p3
2.01 194.97 58.29 34.67 1861.31 1837.19 930.65 918.59 39.78 1.83 19.82 7.95 73.87
avg-cpu: %user %nice %sys %iowait %idle
17.25 0.00 10.50 39.75 32.50
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm %util
cciss/c0d0 5.97 160.20 59.70 41.79 1655.72 1615.92 827.86 807.96 32.24 2.30 20.74 8.06 81.79
cciss/c0d0p1
0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
cciss/c0d0p2
0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
cciss/c0d0p3
5.97 160.20 59.70 41.79 1655.72 1615.92 827.86 807.96 32.24 2.30 20.74 8.06 81.79
avg-cpu: %user %nice %sys %iowait %idle
22.31 0.00 7.77 44.36 25.56
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm %util
cciss/c0d0 12.56 0.00 102.01 0.00 2641.21 0.00 1320.60 0.00 25.89 2.92 30.45 9.84 100.35
cciss/c0d0p1
0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
cciss/c0d0p2
0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
cciss/c0d0p3
12.56 0.00 102.01 0.00 2641.21 0.00 1320.60 0.00 25.89 2.92 30.45 9.84 100.35
avg-cpu: %user %nice %sys %iowait %idle
49.00 0.00 16.50 22.25 12.25
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm %util
cciss/c0d0 7.96 0.00 289.05 0.00 16756.22 0.00 8378.11 0.00 57.97 2.30 8.02 2.85 82.24
cciss/c0d0p1
0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
cciss/c0d0p2
0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
cciss/c0d0p3
7.96 0.00 289.05 0.00 16756.22 0.00 8378.11 0.00 57.97 2.30 8.02 2.85 82.24
###############################################
total used free shared buffers cached
Mem: 2026 1989 36 0 143 1214
-/+ buffers/cache: 631 1394
Swap: 2000 0 2000
###############################################
The question is whether there is any special configuration in Horde or Courier-IMAP for not saturating the Disk I / O.
If you increase the RAM can help with anything?
Thanks
Jolumape
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