Re: whats going on with the scheduler?

From: Andy Farkas <andyf_at_speednet.com.au>
Date: Tue, 8 Jul 2003 14:32:52 +1000 (EST)
On Mon, 7 Jul 2003, Dan Nelson wrote:

> > I bet those *Giants have something to do with it...
>
> Most likely.  That means they're waiting for some other process to
> release the big Giant kernel lock.  Paste in top's header so we can see
> how many processes are locked, and what the system cpu percentage is.

This is what top looks like (up to the 1st 0.00% process) when sitting
idle* with 3 setiathomes:

last pid: 50290;  load averages:  3.02,  3.07,  3.06   up 8+23:24:11  14:00:47
97 processes:  9 running, 71 sleeping, 4 zombie, 12 waiting, 1 lock
CPU states:  4.0% user, 72.0% nice,  4.6% system,  0.7% interrupt, 18.8% idle
Mem: 142M Active, 220M Inact, 116M Wired, 19M Cache, 61M Buf, 1916K Free
Swap: 64M Total, 128K Used, 64M Free

  PID USERNAME   PRI NICE   SIZE    RES STATE  C   TIME   WCPU    CPU COMMAND
42946 setiathome 139   15 16552K 15984K RUN    0  43.8H 98.00% 98.00% setiathome
42945 setiathome 139   15 16944K 15732K CPU1   1  43.0H 97.56% 97.56% setiathome
42947 setiathome 139   15 15524K 14956K CPU0   2  42.9H 94.14% 94.14% setiathome
   14 root       -16    0     0K    12K RUN    0 144.7H 21.97% 21.97% idle: cpu0
   12 root       -16    0     0K    12K RUN    2 153.5H 19.87% 19.87% idle: cpu2
   11 root       -16    0     0K    12K RUN    3 153.6H 18.60% 18.60% idle: cpu3
   13 root       -16    0     0K    12K RUN    1 150.2H 17.29% 17.29% idle: cpu1
50090 root       111    0 11884K 11084K CPU3   3   4:22 11.57% 11.57% cdparanoia
12571 andyf      100    0 20488K 19308K select 1 509:56  4.00%  4.00% XFree86
17629 andyf       97    0  2676K  1624K select 3 244:57  1.03%  1.03% xdaliclock
   16 root       -48 -167     0K    12K *Giant 1 122:57  0.39%  0.39% swi7: tty:sio clock
   38 root        20    0     0K    12K syncer 0 101:47  0.00%  0.00% syncer

*I'm running an X desktop and right now I'm ripping a cd but as you can
see its not doing much else..

Note how the seti procs are getting 94-98% cpu time.

When I do my scp thing, top looks like this:

last pid: 50322;  load averages:  1.99,  2.82,  2.98   up 8+23:39:09  14:15:45
98 processes:  8 running, 71 sleeping, 4 zombie, 12 waiting, 3 lock
CPU states:  1.7% user, 33.7% nice, 20.1% system,  0.6% interrupt, 43.9% idle
Mem: 135M Active, 224M Inact, 120M Wired, 19M Cache, 61M Buf, 1424K Free
Swap: 64M Total, 128K Used, 64M Free

  PID USERNAME   PRI NICE   SIZE    RES STATE  C   TIME   WCPU    CPU COMMAND
42946 setiathome 139   15 16552K 15984K CPU3   2  44.0H 68.41% 68.41% setiathome
50296 andyf      125    0  3084K  2176K RUN    2   7:55 64.21% 64.21% ssh
   12 root       -16    0     0K    12K CPU2   2 153.6H 48.78% 48.78% idle: cpu2
   11 root       -16    0     0K    12K CPU3   3 153.6H 48.63% 48.63% idle: cpu3
   13 root       -16    0     0K    12K RUN    1 150.2H 48.44% 48.44% idle: cpu1
   14 root       -16    0     0K    12K RUN    0 144.8H 45.31% 45.31% idle: cpu0
42947 setiathome 130   15 15524K 14956K RUN    2  43.1H 28.56% 28.56% setiathome
42945 setiathome 125   15 15916K 14700K RUN    0  43.2H 25.05% 25.05% setiathome
50090 root        -8    0  5636K  4832K cbwait 3   5:21  2.69%  2.69% cdparanoia
12571 andyf       97    0 20488K 19308K select 1 510:43  2.39%  2.39% XFree86
   16 root       -48 -167     0K    12K *Giant 0 123:11  0.98%  0.98% swi7: tty:sio clock
17629 andyf       97    0  2676K  1624K *Giant 0 245:18  0.93%  0.93% xdaliclock
   38 root        20    0     0K    12K syncer 1 101:54  0.20%  0.20% syncer
50295 andyf        8    0  2528K  1256K nanslp 0   0:03  0.05%  0.05% scp
28905 root         8    0     0K    12K nfsidl 0  93:02  0.00%  0.00% nfsiod 0

Notice how 'nice' has gone to 33.7% and 'idle' to 43.9%, and the seti
procs have dropped well below 94%.

> A truss of one of the seti processes may be useful too.  setiathome
> really shouldn't be doing many syscalls at all.

If setiathome is making lots of syscalls, then running the 3 instanses
should already show a problem, no?

--

 :{ andyf_at_speednet.com.au

        Andy Farkas
    System Administrator
   Speednet Communications
 http://www.speednet.com.au/
Received on Mon Jul 07 2003 - 19:33:06 UTC

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