Re: tsan execution time for 2 threads over 1

[Dmitry Vyukov]

Yes, this is expected because Valgrind is single-threaded, so it can't take any advantage of threads/cores.

Valgrind-based TSan is deprecated in favor of new compiler-based TSan:

https://code.google.com/p/thread-sanitizer/

The new TSan works with gcc or llvm compiler and is fully parallel.

On Thu, Apr 4, 2013 at 6:10 PM, Marco Paniconi <mar...@google.com> wrote:

Hi,

   I'm running an encoder test with tsan, and the execution time

   of the test is ~1.6 times longer when the codec is using with 2 threads vs 1.

   Is the longer execution time expected if the codec is using multi-threads for encoding?

   Also, what does 2 bug_57266c/68 bug_57266a mean in the 2-thread case output?

thanks,

// FOR 1 THREAD encoding //

09:45:10 common.py [INFO] process ended, did not time out

09:45:10 common.py [INFO] flushing stdout

09:45:10 common.py [INFO] collecting result code

-----------------------------------------------------

Suppressions used:

  count name

      1 bug_103711a

-----------------------------------------------------

09:45:10 tsan_analyze.py [INFO] PASS: No reports found

09:45:10 valgrind_test.py [INFO] Test execution completed successfully.

09:45:10 valgrind_test.py [INFO] Analysis completed successfully.

09:45:10 valgrind_test.py [INFO] elapsed time: 00:15:24

// FOR 2 THREAD encoding //

10:13:53 common.py [INFO] process ended, did not time out

10:13:53 common.py [INFO] flushing stdout

10:13:53 common.py [INFO] collecting result code

-----------------------------------------------------

Suppressions used:

  count name

      1 bug_103711a

      2 bug_57266c

     68 bug_57266a

-----------------------------------------------------

10:13:53 tsan_analyze.py [INFO] PASS: No reports found

10:13:53 valgrind_test.py [INFO] Test execution completed successfully.

10:13:53 valgrind_test.py [INFO] Analysis completed successfully.

10:13:53 valgrind_test.py [INFO] elapsed time: 00:25:06

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