On Saturday 31 March 2001 03:09, Brian J. Beesley wrote:
> On 30 Mar 2001, at 15:53, [EMAIL PROTECTED] wrote:
> > processes are running. However, under Solaris, something
> > run at priority 19 still tends to get a
> > not-insignificant share of CPU time - a typical number
> > is 15% on a system with one other full-priority job
> > running.
>
> I sort of didn't really believe this until I checked it. But you're
> right!
Under Linux, it is only slightly better. (note, however, that the 'other'
job is not a particularly kind one in CPU terms!)
PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME COMMAND
5528 nathan 14 0 464 464 376 R 85.0 0.3 2:47 yes
200 nathan 19 19 11720 11M 336 R N 5.3 8.9 1436m mprime
4126 root 0 0 32860 32M 2180 S 4.9 25.1 4:11 X
5467 nathan 0 0 14452 14M 10572 S 3.0 11.0 0:08 kmail
4262 nathan 0 0 9552 9552 7888 S 0.4 7.3 0:17 kdeinit
4488 nathan 0 0 4524 4524 3440 S 0.3 3.4 0:28 gaim
4277 nathan 0 0 7140 7140 6360 S 0.2 5.4 0:13 kdeinit
5514 nathan 1 0 920 920 696 R 0.2 0.7 0:00 top
> > This has caused me to have to restrict my GIMPS
> > work to only our least-used (read: slowest) Sparcs,
> > since people running actual work-related jobs don't
> > want to be slowed down by a recreational-math program.
>
> Sensible attitude ... doesn't bother me much on the two Solaris
> systems I have access to, since the other jobs running tend to be I/O
> bound rather than compute bound.
I wish the admins here would allow distributed computing - they say that
whenever the machine is slow they were getting flames about the distributed
client 'raising the load average'.
(big snip)
> I think the load average limit for starting the process should be
> about one half less than the number of processors - say 0.5 on a
> uniprocessor system - and the load average limit for stopping it
> should be a little less than one more than the number of processors -
> say 1.8 on a uniprocessor system.
I don't know much about such things, but I would note that I was working
quite comfortably during the above test with load averages in the 2.3 range.
However, the typical 'uniprocessor system' is not a P3 with a single user
typing email!
> Regards
> Brian Beesley
Nathan
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