Originally posted by: tech100

Hello,

a program running in the system has Mthrd=Y on svmon output. Am I right it can run threads simultaneously on availabe processors in the system? Doesn't matter SMT is enabled or not in the system which have more than 1 physical/virtual processor already configured in?

Please tell me how to prove, check, monitor how many processors "are doing job" for the program at a time? Is there a command for that? nmon shows only overall procesors utilisation and I need to monitor what processors are used by such "Mthrd=Y" process at the moment...

Pid     Command             Inuse      Pin     Pgsp  Virtual 64-bit Mthrd  16MB 2818136 acommand             8658     7857        0     8658      Y     Y     N

beste regards,
R.b
#AIX-Forum

Originally posted by: tech100

any expert on the forum?
#AIX-Forum

Originally posted by: dickdunbar

You are correct. AIX will run threaded programs across processors, virtual or not.

One way you can view the usage of the processors is to use AIX "trace".
Warning: It will produce a LOT of data in a HURRY.
http://publib.boulder.ibm.com/infocenter/aix/v6r1/index.jsp?topic=/com.ibm.aix.cmds/doc/aixcmds5/trace.htm

So something like this might be helpful:

trace -C all -faj 106,10c,134,139,254,465 -L 128000000 -o trace.raw

trcon ; your_pgm ; trcstop

trcrpt -O exec=on,pid=on,tid=on,svc=on -o trace.rpt trace.raw

more trace.rpt

---

trace: is started "asynchronously", waiting for "trcon"
Option "-f" says fill the trace.raw file and stop.
trcon ... starts the trace collection
your_pgm ... if it is long running, you can start it in the background
trcstop ... stops the collection
trcrpt ... formats the binary trace data, and shows (among other things) processor dispatched.

The "trace.rpt" will be very large. The art of reading trace is knowing how
to throw uninteresting lines away:

egrep -v 'DECREMENT|DATA|trcstop' trace.rpt | more
#AIX-Forum

Originally posted by: dickdunbar

Too bad we can't edit our own posts.

-C all
Means use one trace buffer for each processor.

trcrpt must also use that option, in order to merge the multiple files
into one cohesive report file. So use:

trcrpt -C all -O exec=on,pid=on,tid=on,svc=on -o trace.rpt trace.raw

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