SCHEDULE and high load situations
Don Lewis
truckman at FreeBSD.org
Thu Aug 12 12:44:47 PDT 2004
On 11 Aug, To: rwatson at freebsd.org wrote:
> I've noticed in fork()/exec() intensive loads like buildworld and
> building ports on a UP box that ULE favors a CPU-bound but niced process
> like setiathome over the software build. Even the longer c++ compile
> steps seem to get less CPU time, than the niced CPU-bound process, at
> least according to top. Buildworld times with ULE on my Athlon XP box
> are about 145 minutes with ULE and 82 minutes with 4BSD when competing
> with setiathome. Top shows setiathome consistently getting about 55% of
> the CPU with ULE. Without setiathome running, buildworld takes about 65
> minutes.
Here's a case where there is not much fork()/exec() activity (last pid
is stable), and there doesn't appear to be much I/O, but the niced
process is getting more than 50% of the CPU. I noticed this during a
portupgrade of editors/openoffice-1.1. The CPU% for setiathome seems to
stay right around in this range +/- a percent or so, with spikes higher
when the other processes normally competing for CPU time are waiting for
I/O.
57 processes: 3 running, 53 sleeping, 1 stopped
CPU states: 42.8% user, 56.0% nice, 1.2% system, 0.0% interrupt, 0.0% idle
Mem: 99M Active, 628M Inact, 156M Wired, 31M Cache, 111M Buf, 83M Free
Swap: 2055M Total, 84K Used, 2055M Free
Seconds to delay:
PID USERNAME PRI NICE SIZE RES STATE TIME WCPU CPU COMMAND
504 setiathome 139 15 17744K 16884K RUN 719:22 54.69% 54.69% setiathome
64008 root 139 0 4232K 3832K RUN 11:50 41.41% 41.41% dmake
568 dl 76 0 6084K 2324K select 5:08 0.00% 0.00% sshd
483 uucp 76 0 1336K 988K select 2:36 0.00% 0.00% newapc
16995 root 76 0 1284K 760K select 2:21 0.00% 0.00% script
12823 root -8 0 1200K 552K piperd 2:03 0.00% 0.00% tee
485 uucp 76 0 1308K 944K select 0:33 0.00% 0.00% upsd
53855 root 8 0 4956K 4212K wait 0:13 0.00% 0.00% perl
489 uucp 8 0 1316K 1012K nanslp 0:12 0.00% 0.00% upsmon
410 root 76 0 2876K 1500K select 0:10 0.00% 0.00% ntpd
59764 dl 76 0 2400K 1604K RUN 0:07 0.00% 0.00% top
437 root 76 0 3436K 2300K select 0:05 0.00% 0.00% sendmail
12822 root 8 0 21348K 20792K wait 0:02 0.00% 0.00% ruby18
490 uucp 8 0 1272K 908K nanslp 0:01 0.00% 0.00% upslog
1101 dl 76 0 6084K 2324K select 0:01 0.00% 0.00% sshd
454 root 8 0 1356K 1004K nanslp 0:01 0.00% 0.00% cron
657 root 20 0 2440K 1940K pause 0:01 0.00% 0.00% csh
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