vtune Amplifier XE 2011 and taskset

amgastineau1 · ‎11-30-2010

Hello,

I need to profile an application which requires to be run with the taskset command. Indeed, this application shares critical data between threads. These data are very frequently used/updates by the all threads. So we benefit to share caches by the multiple threads.

I run it with the following command :

taskset -c 0-7 myapplication

To profile, I want to use the following command vtune Amplifier XE 2011to collect porfiling data but it does report anything :

amplxe-cl -collect hotspotstaskset -c 0-7 myapplication

Collecting "hotspots" is not supported by "-target-pid".

How can I profile my application which requires to be placed on processors with taskset ?

Mickal

Peter_W_Intel · ‎11-30-2010

Hi,

The purpose of using "-target-pid" is to attach a running process, but I assume that you want to launch your application by the tool.

Since myapplication is not child process of taskset, you can use command like as - (use lightweight hotspots analysis)

amplxe-cl -collectlightweight-hotspots -result-dir r0001lh -- taskset -c 0-7 myapplication

Then view result like as -
amplxe-cl -report pmu-events -r r0001lh -filter module=myapplication -group-by function

Otherwise, manually run "taskset -c 0-7 myapplication", thenrun hotspots to attach running app-
amplxe-cl -collect hotspots -result-dir r0001hs -target-pid 1234
amplxe-cl -report hotspots -result-dir r001hs -group-by function -filter module=myapplication

Hope it helps.

Regards, Peter

Hope it helps

Mark_D_Intel · ‎12-01-2010

I tried running a simple example with taskset under amplxe-cl, and it seems to work fine:

amplxe-cl -collect hotspots taskset -c 0-4 tests/few_thread
START
STOP
Using result path `r005hs'
Executing actions 74 % Generating a report

Summary
-------

Elapsed Time: 7.414
CPU Time: 12.368
Executing actions 99 % done

Which Linux distribution are you using?

Can you give more details about how it fails? Does the application run? Is a result directory produced (should be something like 'r000hs')? Does it work without taskset?