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OMP UIA example issue

Amanullah Ghazi
Prodigy 50 points
Other Parts Discussed in Thread: TMS320C6670

Hi

I am trying to run the OMP UIA example project on TMS320C6670 EVM using instructions from http://processors.wiki.ti.com/index.php/SystemAnalyzerTutorial7. 

I am able to build and run the project. In Live Session view, I can even find"OMP PARALLEL FOR...." events. But the Duration view of CCS is blank.

So, I used the filter in the live session view to filter the required events only and computed manually (substracting the stop time from start time). The results didn't make any sense.

40655851262 C66xx_0 Start: Reference time start 
40774170418 C66xx_0 Stop: Reference time stop 
40774176260 C66xx_0 Start: OMP PARALLEL FOR start, using 1 cores 
40892555187 C66xx_0 Stop: OMP PARALLEL FOR stop, using 1 cores 
40892556608 C66xx_0 Start: OMP PARALLEL FOR start, using 2 cores 
47044820977 C66xx_0 Stop: OMP PARALLEL FOR stop, using 2 cores 
47044822384 C66xx_0 Start: OMP PARALLEL FOR start, using 3 cores 
49220830945 C66xx_0 Stop: OMP PARALLEL FOR stop, using 3 cores 
49220832380 C66xx_0 Start: OMP PARALLEL FOR start, using 4 cores 
53700382053 C66xx_0 Stop: OMP PARALLEL FOR stop, using 4 cores 

Event Duration Duration/ref
Reference time 118319156
Using 1 Core 118378927 1.000505168
Using 2 Core 6152264369 51.9971962
Using 3 Core 2176008561 18.39100814
Using 4 Core 4479549673 37.85988528

So, it seems that using more cores have somehow decreased the performance. Am I doing something wrong here?

System info:
CCS v5.5.0.00077, Compiler v7.4.4, XDCtools v3.25.3.72, IPC v1.24.3.32, MCSDK PDK TMS320C6670 v1.1.2.6, OpenMP BIOS runtime library v1.1.3.02, SYS/BIOS v6.35.4.50, System Analyzer (UIA Target) v1.3.1.08

--Amanullah Ghazi

  • 0
    Prodigy 50 points

    Found the issue. I was following instrction from the wiki:

    • run all of the other cores. When core 0 detects that all cores are running, it will hit main and stop.
    • manually halt all the other cores
    • Start System Analyzer->Live to capture events
    • run CPU 0 and then the other core

    Halting slave core was the issue. The wiki may need to be updated.


     

  • 0 in reply to Amanullah Ghazi
    TI__Guru* 81335 points
    We are glad that the issue is resolved. Thank you for the update.