>
> In recent 6.X versions, you can use 'S' to show system threads too.
> For an even more fine-grained view, you can use 'H' to show
> each thread separately.
>
> Then there is also the 'CPU' mode (as opposed to the default 'WCPU'
> mode of top).
>
> > I've the same issue with FBSD 5.4 and TOP. In fact, the
> load averages
> > are so irrelevant now that I barely pay attention to them.
> The server
> > goes to 4 or 6 load averages without slowing down, and
> other times the
> > load average would be 0.8 and the server is running slow.
>
> Probably because the work it does at the moment is not CPU-bounded?
>
> > An example of unmatching TOP:
> >
> > last pid: 17889; load averages: 0.60, 0.52, 0.50
> up 3+17:22:33 00:41:45
> > 186 processes: 2 running, 183 sleeping, 1 lock CPU states:
> 30.0% user,
> > 0.0% nice, 1.7% system, 0.1% interrupt, 68.3% idle
> > Mem: 1678M Active, 1110M Inact, 287M Wired, 87M Cache, 112M
> Buf, 103M
> > Free
> > Swap: 8762M Total, 1584K Used, 8760M Free
> >
> > PID USERNAME PRI NICE SIZE RES STATE C TIME
> WCPU CPU COMMAND
> > 5071 nobody 101 0 43124K 35180K CPU2 2 0:07
> 14.89% 14.89% httpd
> > 14409 nobody 4 0 43940K 36076K sbwait 0 0:01
> 1.22% 1.22% httpd
> > 95515 nobody 4 0 39892K 32188K sbwait 1 0:08
> 0.29% 0.29% httpd
>
> Try hitting 'S'. Perhaps the system spends too much time in
> system threads (i.e. the "syncer") :)
>
I think TOP and load averages are no longer accurate on FBSD 5.x and 6.x with
SMP kernel. As far as I've seen. Load averages hit sometimes 8.0 without a
noticable degradation in performance.
This is one TOP that freaked me out, notice Idle CPU is 70% while the process
is showing it is using 99% of CPU. systat draws more accurate picture, however,
load average is still useless as far as performance monitoring :
last pid: 10174; load averages: 1.63, 1.44, 1.20
up 4+00:25:19 00:39:20
169 processes: 2 running, 166 sleeping, 1 zombie
CPU states: 25.8% user, 0.0% nice, 0.7% system, 0.1% interrupt, 73.4% idle
Mem: 1316M Active, 1445M Inact, 297M Wired, 127M Cache, 112M Buf, 79M Free
Swap: 8762M Total, 2096K Used, 8760M Free
PID USERNAME PRI NICE SIZE RES STATE C TIME WCPU CPU COMMAND
13362 root 111 0 36444K 34196K CPU3 3 50:06 98.88% 98.88% perl5.8.7
90391 root 96 0 27356K 26236K select 2 0:06 0.54% 0.54% perl5.8.7
79619 nobody 4 0 209M 84640K sbwait 1 0:09 0.39% 0.39% httpd
10161 root 97 0 6712K 4752K select 2 0:00 1.40% 0.20% exim-4.62-0
79649 nobody 20 0 210M 84464K lockf 0 0:06 0.15% 0.15% httpd
10158 mailnull 4 0 6760K 3992K sbwait 2 0:00 0.81% 0.15% exim-4.62-0
79654 nobody 4 0 208M 68660K sbwait 0 0:08 0.05% 0.05% httpd
79660 nobody 4 0 208M 58144K sbwait 0 0:06 0.05% 0.05% httpd
10170 sshd 117 0 4768K 2052K select 0 0:00 1.00% 0.05% sshd
1123 mysql 96 0 346M 214M select 2 114:48 0.00% 0.00% mysqld
1123 mysql 20 0 346M 214M kserel 3 114:48 0.00% 0.00% mysqld
1123 mysql 20 0 346M 214M kserel 3 114:48 0.00% 0.00% mysqld
1123 mysql 20 0 346M 214M kserel 2 114:48 0.00% 0.00% mysqld
1123 mysql 20 0 346M 214M kserel 0 114:48 0.00% 0.00% mysqld
1123 mysql 20 0 346M 214M kserel 2 114:48 0.00% 0.00% mysqld
1123 mysql 20 0 346M 214M kserel 1 114:48 0.00% 0.00% mysqld
1123 mysql 20 0 346M 214M kserel 0 114:48 0.00% 0.00% mysqld
1123 mysql 20 0 346M 214M kserel 0 114:48 0.00% 0.00% mysqld
1123 mysql 20 0 346M 214M kserel 3 114:48 0.00% 0.00% mysqld
1123 mysql 20 0 346M 214M kserel 3 114:48 0.00% 0.00% mysqld
1123 mysql 20 0 346M 214M kserel 0 114:48 0.00% 0.00% mysqld
1123 mysql 20 0 346M 214M kserel 1 114:48 0.00% 0.00% mysqld
1123 mysql 20 0 346M 214M kserel 2 114:48 0.00% 0.00% mysqld
1123 mysql 20 0 346M 214M kserel 1 114:48 0.00% 0.00% mysqld
1123 mysql 20 0 346M 214M kserel 1 114:48 0.00% 0.00% mysqld
1123 mysql 20 0 346M 214M kserel 0 114:48 0.00% 0.00% mysqld
1123 mysql 20 0 346M 214M kserel 0 114:48 0.00% 0.00% mysqld
1123 mysql 20 0 346M 214M kserel 2 114:48 0.00% 0.00% mysqld
1123 mysql 20 0 346M 214M kserel 1 114:48 0.00% 0.00% mysqld
1123 mysql 20 0 346M 214M kserel 0 114:48 0.00% 0.00% mysqld
1123 mysql 20 0 346M 214M kserel 2 114:48 0.00% 0.00% mysqld
1123 mysql 20 0 346M 214M kserel 0 114:48 0.00% 0.00% mysqld
1123 mysql 20 0 346M 214M kserel 1 114:48 0.00% 0.00% mysqld
1123 mysql 20 0 346M 214M kserel 0 114:48 0.00% 0.00% mysqld
1123 mysql 20 0 346M 214M kserel 1 114:48 0.00% 0.00% mysqld
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