Re: 2.5.65: *huge* interactivity problems

From: Pavel Machek (pavel@ucw.cz)
Date: Mon Mar 24 2003 - 18:34:29 EST


Hi!

> > I'm having awfull interactivity problems. While lingvistic application
> > (slm from nltools.sf.net) is running, machine is unusable. I still can
> > read text in most, but can't login, can't run links, can't... For
> > minutes.
> >
> > slm does a lot of computation over ~250MB dataset, but during stall
> > disk was not active.
>
> Oh Pavel, this is more a whinge than a bug report. You know better
> ;)

Yes, it is whine, it is *so* horrible that I thought everyone must see
it.

Looks like scheduler problem to me. Disk is not lit.

vmstat (part):

 6 1 15352 3316 408 54164 0 0 256 0 1039 100 99 1 0 0
 6 1 15352 3316 408 54168 0 0 0 0 1033 99 100 0 0 0
procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
 r b swpd free buff cache si so bi bo in cs us sy id wa
 6 1 15352 4212 408 53132 0 0 256 0 1040 109 98 2 0 0
 6 1 15352 4044 408 53388 0 0 256 0 1051 112 99 1 0 0
 6 1 15352 3708 408 53704 0 0 312 0 1045 108 99 1 0 0
 6 1 15352 3484 408 53968 0 0 256 0 1045 130 96 4 0 0
 6 1 15352 4276 392 53012 0 0 444 0 1088 131 95 5 0 0
 6 1 15352 3828 392 53528 0 0 512 72 1034 114 100 0 0 0
 6 1 15352 3828 392 53536 0 0 0 0 1057 90 99 1 0 0
 6 1 15352 3604 392 53792 0 0 256 0 1052 87 88 12 0 0
 6 1 15352 3324 392 54052 0 0 256 0 1040 95 88 12 0 0
 6 1 15352 5340 360 52044 0 0 256 0 1031 90 93 7 0 0
 8 1 15352 5164 360 52304 0 0 256 8 1036 99 98 2 0 0
 4 1 15352 4884 360 52564 0 0 256 0 1031 118 98 2 0 0
 4 1 15352 4660 360 52828 0 0 256 0 1210 215 97 3 0 0

Login takes > 30 seconds at this point.

> - How much memory does the machine have?

256MB

> - UP/SMP/preempt?

UP

> - What do vmstat and top say?

top is hung, too.

> - Did it happen in 2.5.64? 2.5.63? 2.4.20?

Definitely not there with 2.4., and I do not think I seen it with 2.5.64.

> - Does it get better if you renice stuff?

Will try.

> - What steps should others take to reproduce it?

Quite hard to reproduce, that lingvistics tools are not really fun to
use.

> etc, etc, etc.
                                                                Pavel

-- 
Horseback riding is like software...
...vgf orggre jura vgf serr.
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This archive was generated by hypermail 2b29 : Mon Mar 31 2003 - 22:00:17 EST