* pfaults.stp
@ 2013-09-04 21:14 Paddie O'Brien
2013-09-05 15:11 ` pfaults.stp William Cohen
0 siblings, 1 reply; 2+ messages in thread
From: Paddie O'Brien @ 2013-09-04 21:14 UTC (permalink / raw)
To: systemtap
Hi,
I'm running a simple program and attempting to use examples/memory/pfaults.stp
to see the page faults it generates. The program runs but pfaults.stp
stays quiet
every time (even the first). I know I'm missing something stupid but...
Shouldn't I see something?!
Thanks,
Paddie
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: pfaults.stp
2013-09-04 21:14 pfaults.stp Paddie O'Brien
@ 2013-09-05 15:11 ` William Cohen
0 siblings, 0 replies; 2+ messages in thread
From: William Cohen @ 2013-09-05 15:11 UTC (permalink / raw)
To: Paddie O'Brien; +Cc: systemtap
On 09/04/2013 05:14 PM, Paddie O'Brien wrote:
> Hi,
>
> I'm running a simple program and attempting to use examples/memory/pfaults.stp
> to see the page faults it generates. The program runs but pfaults.stp
> stays quiet
> every time (even the first). I know I'm missing something stupid but...
>
> Shouldn't I see something?!
>
> Thanks,
> Paddie
>
Hi Paddie,
On Fedora 19 running on an x86_64 machine I just ran the example and I got the expected output like:
$ stap pfaults.stp
...
18974551:2368:0x7f6e429bf000:w:minor:11
18974610:2368:0x7f6e429c0000:w:minor:1
18974671:2368:0x7f6e429c1000:w:minor:1
18974743:2368:0x7f6e429c2000:w:minor:11
18974801:2368:0x7f6e429c3000:w:minor:1
18974858:2368:0x7f6e429c4000:w:minor:0
18974920:2368:0x7f6e429c5000:w:minor:1
You might also do "stap -v pfaults.stp" to see if is just taking a while to get the instrumentation started. On a machine that everything has been running a while you might not get much output. Did you try to start a new program to trigger some page faults? You can check that you are getting some page faults doing something like:
$ /usr/bin/time calc
/usr/bin/time: cannot run calc: No such file or directory
0.00user 0.00system 0:00.00elapsed 0%CPU (0avgtext+0avgdata 248maxresident)k
0inputs+0outputs (0major+49minor)pagefaults 0swaps
Could you provide a bit more information about the environment you are running things in as listed on https://sourceware.org/systemtap/wiki/HowToReportBugs?
-Will
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