by Hello!
Look how long is following command on system with 3000 processes.
real 0m10.380s
user 0m5.511s
sys 0m4.870s
Ie, ten ps'es eat 10 secs and system had no active processes at all.
I really don't like it. Therefore, I started to implement own chardev driver
with own tool (I call it 'fast ps'). Look how long it needs:
real 0m0.992s
user 0m0.620s
sys 0m0.372s
Of course, the tool isn't ready yet, but things change ... Here is output of fast ps:
F UID PID PPID PRI NI VSIZE RSS WCHAN STAT TTY TIME COMMAND
100 0 1 0 29 0 1372 424 do_sel S ? 0:08 init [5]
040 0 2 1 30 0 0 0 contex S ? 0:07 keventd
040 0 3 1 30 0 0 0 apm_ma S ? 0:00 kapmd
040 0 4 1 40 19 0 0 ksofti SN ? 0:03 ksoftirqd
840 0 5 1 30 0 0 0 kswapd S ? 0:05 kswapd
040 0 6 1 30 0 0 0 bdflus S ? 0:00 bdflush
040 0 7 1 30 0 0 0 kupdat S ? 0:00 kupdated
040 0 11 1 30 0 0 0 end S ? 0:01 kjournald
040 0 90 1 30 0 0 0 end S ? 0:00 khubd
040 0 191 1 30 0 0 0 end S ? 0:03 kjournald
040 0 462 1 30 0 1428 492 do_sel S ? 0:00 syslogd -
140 0 467 1 30 0 1364 428 do_sys S ? 0:00 klogd -x
140 32 487 1 30 0 1512 452 do_pol S ? 0:00 portmap
140 0 517 1 30 0 1696 524 do_pol S ? 0:00 rpc.mount
140 0 522 1 30 0 0 0 end S ? 0:00 nfsd
140 0 523 1 30 0 0 0 end S ? 0:01 nfsd
040 0 524 1 30 0 0 0 end S ? 0:00 lockd
040 0 525 524 30 0 0 0 end S ? 0:00 rpciod
140 0 636 1 30 0 1488 440 do_sel S ? 0:00 /sbin/car
140 0 654 1 29 0 1360 412 do_sel S ? 0:00 /usr/sbin
140 0 723 1 29 0 2620 652 do_sel S ? 0:00 /usr/sbin
140 0 743 1 30 0 1536 536 nanosl S ? 0:00 crond
040 0 761 1 30 0 1404 464 nanosl S ? 0:00 /usr/sbin
100 0 778 1 30 0 1344 336 read_c S tty1 0:00 /sbin/min
100 0 779 1 30 0 3212 644 do_sel S ? 0:00 /usr/X11R
040 0 5499 1 30 0 0 0 end S ? 0:00 kjournald
100 0 20899 779 38 0 25260 10052 - R ? 8:57 /usr/X11R
At this moment, I have patches against 2.4.20 and 2.5.53. You may find tarball
at http://tmi.comex.ru/fastps.tgz.
I would love to hear any comments/suggestions!
with best regards, Alex
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