On Wednesday 11 July 2007 20:19:46 Aleksey Cheusov wrote:
> > Just noticed something peculiar with a recently compiled (after 25th
> > June) kernel/userland for NetBSD 4.0_beta2. ps seems to report some
> > process elapsed times to generally be zero which doesn't tally with top
> > etc. say. e.g
> >
> > root(anduin)tmp$ ps -ax |head -20
> >   PID TTY    STAT    TIME COMMAND
> >     0 ?      DKs  0:00.00 [swapper]
> >     1 ?      Is   0:00.00 init
> >     2 ?      DK   0:00.00 [atabus0]
> >     3 ?      DK   0:00.00 [atabus1]
> >     4 ?      DK   0:00.00 [usb0]
> >     5 ?      DK   0:00.00 [usbtask-hc]
> >     6 ?      DK   0:00.00 [usbtask-dr]
> >     7 ?      DK   0:00.00 [cryptoret]
> >     8 ?      DK   0:00.00 [pagedaemon]
> >     9 ?      DK   0:00.00 [ioflush]
> >    10 ?      DK   0:00.00 [aiodoned]
> >    44 ?      DK   0:00.00 [physiod]
> >    97 ?      I    0:00.00 /usr/pkg/sbin/httpd -k start
> >    98 ?      I    0:00.00 /usr/pkg/sbin/httpd -k start
> >    99 ?      I    0:00.00 /usr/pkg/sbin/httpd -k start
> >   253 ?      Is   0:00.00 /sbin/dhclient
> >   285 ?      I    0:00.00 /usr/pkg/sbin/httpd -k start
> >   315 ?      Ss   0:00.00 /usr/sbin/syslogd -s
> >   474 ?      Ss   0:00.00 /usr/sbin/ntpd
>
> [skipped]
>
> > Anyone else seeing this?
>
> I see the same. Most processes (77 from 82) have 0:00.00 at TIME column.
>
> But
>
> 0 ~>yes > /dev/null &
> [1] 7659
> [1]  0 ~>sleep 10
> [1]  0 ~>ps -ax | grep yes
> 7233 ttyp1 R+   0:00.00 grep yes (ksh)
> 7659 ttyp1 R    0:16.74 yes
> [1]  0 ~>

Thanks for the feedback, I thought I had seriously screwed up a build. I see 
the correct output for the looping process above, but most other processes
except compute bound ones like dnetc report 0:00.00. Yet a copy of ps from 
last year seems to report times which tally with top. I have put the latter
binary on an ftp server (ftp://ftp.liv.ac.uk/pub/dtyson/ps), it would be 
useful if you could see if it reports more sensible times on your system.
I'll have a look at differences between the versions and see if I can spot 
where the error lies and put in a PR.

Cheers,
Dave

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