topic Question on GS140 in Operating System - Tru64 Unix

Question on GS140

abhay_7 — Mon, 27 Oct 2003 10:02:52 GMT

Is AlphaServer GS140 ( Digital Unix 4.0F) a true SMP system ?

Also, what does the field CPU in the output of ps -ef tell - CPU busy %age or CPU utilization by a process

Re: Question on GS140

Cortes Albertino — Mon, 27 Oct 2003 10:44:34 GMT

hello,

Have a look to "psr" field.

# psrinfo -n
number of processors on system = 2

#sizer -v
Digital UNIX V4.0F (Rev. 1229); Thu Sep 11 16:45:01 MET DST 2003
#ps -eopid,ppid,psr,state,pcpu,vsize,rssize,start,time,command

or
# ps -opid,ppid,psr,state,pcpu,vsize,rssize,start,time,command
PID PPID PSR S %CPU VSZ RSS STARTED TIME COMMAND
28659 1 ~0 I + 0.0 472K 104K Oct 18 0:00.01 /usr/sbin/getty console console vt100
18337 18355 1 I + 0.0 2.05M 352K Oct 02 0:00.92 -csh (csh)
25468 25431 1 S 0.0 2.05M 320K 16:33:42 0:00.23 -csh (csh)
25594 25468 0 R + 0.0 1.84M 280K 16:44:04 0:00.01 ps -opid,ppid,psr,state,pcpu,vsize,rssize,start,time,com
#

Hope it helps,

Best regards,

Albertino Cortes

Re: Question on GS140

abhay_7 — Mon, 27 Oct 2003 10:53:36 GMT

Well - so what does CPU% signifies. %age of time CPU was busy or %age of CPU quota used by the particular process ?

Re: Question on GS140

Cortes Albertino — Mon, 27 Oct 2003 11:43:34 GMT

Hello,

pcpu %CPU

Percent CPU usage. This is a decaying
average of up to a minute of previous
(real) time. Since the time base over
which this is computed varies (since
processes may be very young), it is possi-
ble for the sum of all %CPU fields to
exceed 100%.
Also possible
# ps -eO SCHED

Regards,
Albertino Cortes

Re: Question on GS140

Hein van den Heuvel — Mon, 27 Oct 2003 15:38:55 GMT

The GS140 is a true SMP system.
All CPUs and Memory sit on a single backplane.
All memory access times are equal.

Memory benchwidth is 1.2 - 2.0 gb/sec depending on clock speed and interleaving.

For maximum memory performance please strive to have 4 memory modules and avoid 3 modules, unless you really really need that memory to be there.

Hein.