command piped into bzip not using all available CPU

[Scott Lambert]

On Mon, Apr 19, 2004 at 09:09:21AM -0500, Jim C. Nasby wrote:
> Why would I expect to see it only use one CPU? It was CPU bound, not
> disk bound. There were two CPU-intensive processes running, why wouldn't
> they each use a different CPU?
> 
> On Mon, Apr 19, 2004 at 12:08:32AM -0700, Aaron Seelye wrote:
> > I'm not sure the exact technical reason, but as I understand that, it's
> > 47% idle on the total cpu power of the machine, which would indicate
> > that one cpu was 100% full, and the other was 3%, due to system usage,
> > i/o, or whatever else was running.  This is quite normal in my
> > experience, and what you should expect to see.

At the time you took the snapshot, both processes were running on the
same CPU.  FreeBSD 4.x or 5.2?  If 5.2, SCHED_4BSD or SCHED_ULE?

> > > The command I'm running is:
> > > pg_dump -vZ0 ogr | bzip2 > ogr-20040416.sql.bz2
> > >
> > >   PID USERNAME PRI NICE   SIZE    RES STATE  C   TIME   WCPU    CPU COMMAND
> > > 17334 decibel  109    0 10856K  7164K CPU0   0  11:05 65.77% 65.77% bzip2
> > > 17335 pgsql      4    0   154M   124M sbwait 0   5:54 34.03% 34.03% postgres
> > > 17333 decibel   -8    0 20128K  3236K pipdwt 0   0:46  2.88%  2.88% pg_dump

-- 
Scott Lambert                    KC5MLE                       Unix SysAdmin
lambert at lambertfam.org