* 2.5.52, load and process in D state
@ 2002-12-21 20:32 Paolo Ciarrocchi
2002-12-21 23:20 ` Andrew Morton
0 siblings, 1 reply; 3+ messages in thread
From: Paolo Ciarrocchi @ 2002-12-21 20:32 UTC (permalink / raw
To: akpm, linux-kernel
Hi all,
I booted 2.5.52 with the following parmater:
apm=off mem=32M (not sure about the amount, anyway I can reproduce
the problem for sure with 32M and 40M)
Then I tried the osdb (www.osdb.org) benchmark with
40M of data.
$./bin/osdb-pg --nomulti
the result is that aftwer a few second running top I see the postmaster
process in D state and a lot if iowait.
I tried to understand if with 2.5* my hd is too slow,
but hdparm -t -T gives me better results then 2.4.19.
I _can not_ reproduce this issue with 2.4.19
Following a part of the top -b > foo output, if you need I can post
the entire output.
Is it a known issue ? And, is it a problem or am I just trying
to run the kernel with too few memory?
If you want to replay this email please cc me ;-)
Ciao,
Paolo
21:59:09 up 6 min, 3 users, load average: 0.91, 0.57, 0.28
34 processes: 33 sleeping, 1 running, 0 zombie, 0 stopped
CPU states: 24.9% user 7.9% system 0.0% nice 63.7% iowait 3.3% idle
Mem: 21216k av, 20700k used, 516k free, 0k shrd, 324k buff
11748k active, 4388k inactive
Swap: 272120k av, 1848k used, 270272k free 8960k cached
PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME CPU COMMAND
1135 postgres 15 0 7228 2924 6252 D 30.9 13.7 0:03 0 postmaster
6 root 15 0 0 0 0 DW 0.7 0.0 0:00 0 kswapd0
1136 root 15 0 2016 1028 1888 R 0.3 4.8 0:00 0 top
930 root 15 0 2020 744 1888 S 0.1 3.5 0:00 0 top
1 root 15 0 1292 244 1244 S 0.0 1.1 0:06 0 init
2 root 34 19 0 0 0 SWN 0.0 0.0 0:00 0 ksoftirqd/0
3 root 15 0 0 0 0 SW 0.0 0.0 0:00 0 events/0
4 root 15 0 0 0 0 SW 0.0 0.0 0:00 0 pdflush
5 root 15 0 0 0 0 SW 0.0 0.0 0:00 0 pdflush
7 root 25 0 0 0 0 SW 0.0 0.0 0:00 0 aio/0
8 root 25 0 0 0 0 SW 0.0 0.0 0:00 0 kseriod
10 root 21 0 0 0 0 SW 0.0 0.0 0:00 0 reiserfs/0
486 root 15 0 1360 368 1280 S 0.0 1.7 0:00 0 syslogd
494 root 15 0 2120 1024 1232 S 0.0 4.8 0:00 0 klogd
525 root 15 0 1340 276 1288 S 0.0 1.3 0:00 0 gpm
596 xfs 15 0 5052 3036 2232 S 0.0 14.3 0:00 0 xfs
611 daemon 18 0 1316 256 1268 S 0.0 1.2 0:00 0 atd
625 root 16 0 2076 388 1792 S 0.0 1.8 0:00 0 xinetd
678 root 15 0 1488 324 1428 S 0.0 1.5 0:00 0 crond
787 root 15 0 2252 428 1892 S 0.0 2.0 0:00 0 login
788 root 15 0 2252 412 1892 S 0.0 1.9 0:00 0 login
789 root 15 0 2252 520 1892 S 0.0 2.4 0:00 0 login
790 root 15 0 1252 188 1220 S 0.0 0.8 0:00 0 mingetty
791 root 15 0 1252 188 1220 S 0.0 0.8 0:00 0 mingetty
792 root 15 0 1252 188 1220 S 0.0 0.8 0:00 0 mingetty
795 root 15 0 2736 520 2336 S 0.0 2.4 0:00 0 bash
828 root 16 0 2264 504 1920 S 0.0 2.3 0:00 0 su
829 postgres 15 0 2704 1160 2336 S 0.0 5.4 0:00 0 bash
864 root 15 0 2740 724 2336 S 0.0 3.4 0:00 0 bash
890 root 15 0 2748 1204 2336 S 0.0 5.6 0:00 0 bash
1092 postgres 15 0 6808 1400 6252 S 0.0 6.5 0:00 0 postmaster
1094 postgres 15 0 7800 1380 6252 S 0.0 6.5 0:00 0 postmaster
1095 postgres 15 0 6844 1424 6252 S 0.0 6.7 0:00 0 postmaster
1104 postgres 15 0 1780 692 1528 S 0.0 3.2 0:00 0 osdb-pg
21:59:14 up 6 min, 3 users, load average: 0.91, 0.58, 0.29
34 processes: 31 sleeping, 3 running, 0 zombie, 0 stopped
CPU states: 26.2% user 8.3% system 0.0% nice 57.7% iowait 7.5% idle
Mem: 21216k av, 20576k used, 640k free, 0k shrd, 280k buff
11044k active, 4992k inactive
Swap: 272120k av, 1848k used, 270272k free 8932k cached
PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME CPU COMMAND
1135 postgres 15 0 7228 2928 6252 R 32.8 13.8 0:04 0 postmaster
6 root 15 0 0 0 0 SW 0.7 0.0 0:00 0 kswapd0
930 root 16 0 2020 744 1888 S 0.3 3.5 0:00 0 top
1 root 15 0 1292 244 1244 S 0.0 1.1 0:06 0 init
2 root 34 19 0 0 0 SWN 0.0 0.0 0:00 0 ksoftirqd/0
3 root 15 0 0 0 0 RW 0.0 0.0 0:00 0 events/0
4 root 15 0 0 0 0 SW 0.0 0.0 0:00 0 pdflush
5 root 15 0 0 0 0 SW 0.0 0.0 0:00 0 pdflush
7 root 25 0 0 0 0 SW 0.0 0.0 0:00 0 aio/0
8 root 25 0 0 0 0 SW 0.0 0.0 0:00 0 kseriod
10 root 21 0 0 0 0 SW 0.0 0.0 0:00 0 reiserfs/0
486 root 15 0 1360 368 1280 S 0.0 1.7 0:00 0 syslogd
494 root 15 0 2120 1024 1232 S 0.0 4.8 0:00 0 klogd
525 root 15 0 1340 276 1288 S 0.0 1.3 0:00 0 gpm
596 xfs 15 0 5052 3036 2232 S 0.0 14.3 0:00 0 xfs
611 daemon 18 0 1316 256 1268 S 0.0 1.2 0:00 0 atd
625 root 16 0 2076 388 1792 S 0.0 1.8 0:00 0 xinetd
678 root 15 0 1488 324 1428 S 0.0 1.5 0:00 0 crond
787 root 15 0 2252 428 1892 S 0.0 2.0 0:00 0 login
788 root 15 0 2252 412 1892 S 0.0 1.9 0:00 0 login
789 root 15 0 2252 520 1892 S 0.0 2.4 0:00 0 login
790 root 15 0 1252 188 1220 S 0.0 0.8 0:00 0 mingetty
791 root 15 0 1252 188 1220 S 0.0 0.8 0:00 0 mingetty
792 root 15 0 1252 188 1220 S 0.0 0.8 0:00 0 mingetty
795 root 15 0 2736 520 2336 S 0.0 2.4 0:00 0 bash
828 root 16 0 2264 504 1920 S 0.0 2.3 0:00 0 su
829 postgres 15 0 2704 1160 2336 S 0.0 5.4 0:00 0 bash
864 root 15 0 2740 724 2336 S 0.0 3.4 0:00 0 bash
890 root 15 0 2748 1204 2336 S 0.0 5.6 0:00 0 bash
1092 postgres 15 0 6808 1400 6252 S 0.0 6.5 0:00 0 postmaster
1094 postgres 15 0 7800 1380 6252 S 0.0 6.5 0:00 0 postmaster
1095 postgres 15 0 6844 1424 6252 S 0.0 6.7 0:00 0 postmaster
1104 postgres 15 0 1780 692 1528 S 0.0 3.2 0:00 0 osdb-pg
1136 root 15 0 2016 1028 1888 R 0.0 4.8 0:00 0 top
21:59:20 up 6 min, 3 users, load average: 1.00, 0.60, 0.29
34 processes: 31 sleeping, 3 running, 0 zombie, 0 stopped
CPU states: 24.3% user 7.7% system 0.0% nice 63.5% iowait 4.3% idle
Mem: 21216k av, 20592k used, 624k free, 0k shrd, 248k buff
10484k active, 5552k inactive
Swap: 272120k av, 2216k used, 269904k free 9088k cached
PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME CPU COMMAND
1135 postgres 16 0 7228 2620 6252 D 31.0 12.3 0:06 0 postmaster
6 root 15 0 0 0 0 DW 0.6 0.0 0:00 0 kswapd0
1136 root 15 0 2016 824 1888 R 0.4 3.8 0:00 0 top
5 root 15 0 0 0 0 SW 0.1 0.0 0:00 0 pdflush
930 root 15 0 2020 684 1888 R 0.1 3.2 0:00 0 top
1 root 15 0 1292 196 1244 S 0.0 0.9 0:06 0 init
2 root 34 19 0 0 0 SWN 0.0 0.0 0:00 0 ksoftirqd/0
3 root 15 0 0 0 0 RW 0.0 0.0 0:00 0 events/0
4 root 15 0 0 0 0 SW 0.0 0.0 0:00 0 pdflush
7 root 25 0 0 0 0 SW 0.0 0.0 0:00 0 aio/0
8 root 25 0 0 0 0 SW 0.0 0.0 0:00 0 kseriod
10 root 21 0 0 0 0 SW 0.0 0.0 0:00 0 reiserfs/0
486 root 15 0 1360 324 1280 S 0.0 1.5 0:00 0 syslogd
494 root 15 0 2120 1008 1232 S 0.0 4.7 0:00 0 klogd
525 root 15 0 1340 260 1288 S 0.0 1.2 0:00 0 gpm
596 xfs 15 0 5052 3008 2232 S 0.0 14.1 0:00 0 xfs
611 daemon 18 0 1316 228 1268 S 0.0 1.0 0:00 0 atd
625 root 16 0 2076 360 1792 S 0.0 1.6 0:00 0 xinetd
678 root 15 0 1488 284 1428 S 0.0 1.3 0:00 0 crond
787 root 15 0 2252 396 1892 S 0.0 1.8 0:00 0 login
788 root 15 0 2252 376 1892 S 0.0 1.7 0:00 0 login
789 root 15 0 2252 476 1892 S 0.0 2.2 0:00 0 login
790 root 15 0 1252 168 1220 S 0.0 0.7 0:00 0 mingetty
791 root 15 0 1252 164 1220 S 0.0 0.7 0:00 0 mingetty
792 root 15 0 1252 164 1220 S 0.0 0.7 0:00 0 mingetty
795 root 15 0 2736 476 2336 S 0.0 2.2 0:00 0 bash
828 root 16 0 2264 472 1920 S 0.0 2.2 0:00 0 su
829 postgres 15 0 2704 984 2336 S 0.0 4.6 0:00 0 bash
864 root 15 0 2740 632 2336 S 0.0 2.9 0:00 0 bash
890 root 15 0 2748 980 2336 S 0.0 4.6 0:00 0 bash
1092 postgres 15 0 6808 1124 6252 S 0.0 5.2 0:00 0 postmaster
1094 postgres 15 0 7800 1108 6252 S 0.0 5.2 0:00 0 postmaster
1095 postgres 15 0 6844 1096 6252 S 0.0 5.1 0:00 0 postmaster
1104 postgres 15 0 1780 560 1528 S 0.0 2.6 0:00 0 osdb-pg
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: 2.5.52, load and process in D state
2002-12-21 20:32 2.5.52, load and process in D state Paolo Ciarrocchi
@ 2002-12-21 23:20 ` Andrew Morton
0 siblings, 0 replies; 3+ messages in thread
From: Andrew Morton @ 2002-12-21 23:20 UTC (permalink / raw
To: Paolo Ciarrocchi; +Cc: linux-kernel
Paolo Ciarrocchi wrote:
>
> Hi all,
> I booted 2.5.52 with the following parmater:
> apm=off mem=32M (not sure about the amount, anyway I can reproduce
> the problem for sure with 32M and 40M)
>
> Then I tried the osdb (www.osdb.org) benchmark with
> 40M of data.
>
> $./bin/osdb-pg --nomulti
>
> the result is that aftwer a few second running top I see the postmaster
> process in D state and a lot if iowait.
What exactly _is_ the issue? The machine is achieving 25% CPU utilisation
in user code, 6-9% in system code. It is doing a lot of I/O, and is
getting work done.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: 2.5.52, load and process in D state
@ 2002-12-22 1:09 Paolo Ciarrocchi
0 siblings, 0 replies; 3+ messages in thread
From: Paolo Ciarrocchi @ 2002-12-22 1:09 UTC (permalink / raw
To: akpm, arashi; +Cc: linux-kernel
From: Andrew Morton <akpm@digeo.com>
> Paolo Ciarrocchi wrote:
> >
> > Hi all,
> > I booted 2.5.52 with the following parmater:
> > apm=off mem=32M (not sure about the amount, anyway I can reproduce
> > the problem for sure with 32M and 40M)
> >
> > Then I tried the osdb (www.osdb.org) benchmark with
> > 40M of data.
> >
> > $./bin/osdb-pg --nomulti
> >
> > the result is that aftwer a few second running top I see the postmaster
> > process in D state and a lot if iowait.
>
> What exactly _is_ the issue? The machine is achieving 25% CPU utilisation
> in user code, 6-9% in system code. It is doing a lot of I/O, and is
> getting work done.
The issue it that with 2.4.19 the postmaster process never go in D state
and iowait always reports 0%.
Sounds strange with me.
Ciao,
Paolo
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