> I have a server (kernel 2.0.35, debian 2.0 installation) which is
> under a rather heavy total load, even though no single subsystem
> seems to be under excessive load.
What exactly is that server doing?
> 1) The machine in question is doing quite a few context switches;
> around 1300-1400 per second in average, sometimes topping 4500 or
> more (as reported by vmstat). This is a P2-266
That's quite a lot, even though the dual-AXP with 200
simultaneous users sometimes exceeds this :)
> 2) Is it possible to see how much time a single process spends
> waiting for I/O reads and writes? I understand top on both solaris
> and HP/UX reports a percentage measurement for this.
That's not possible, but vmstat should give you enough
statistical information to help us out on this quest...
If you could send some more system info (memory, type
of disk subsystem, usage pattern) and vmstat and maybe
top output, then we can probably pinpoint the cause in
a minute or 2...
regards,
Rik -- If a Microsoft product fails, who do you sue?
+-------------------------------------------------------------------+
| Linux memory management tour guide. riel@nl.linux.org |
| Scouting Vries cubscout leader. http://www.nl.linux.org/~riel |
+-------------------------------------------------------------------+
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.tux.org/lkml/