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Thread: Request: Solo CPU tests on multi-core platform

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  1. #1
    Join Date
    Feb 2010
    Posts
    2

    Post Request: Solo CPU tests on multi-core platform

    Hello.
    It would be more interesting to add some solo CPU tests when benchmarking multi-core-CPUs.
    It is today nearly impossible to see in benchmarks how fast is one core. The majority of cpu tasks are still single core today.

    Here is an example:
    http://www.phoronix.com/scan.php?pag...amd_2010&num=6
    Well we see how well povray renders on 8 cores. But how well it is with 1 thread, 2 threads, 12 threads (more threads than cores)? Are 8 threads ~8x faster than 1 (thus we can see the effectivity of this solution)?

    Another here:
    http://www.phoronix.com/scan.php?pag...rei3_530&num=7
    It would be very interesting to have results for 1,2,4,6,8 threads for each processor. Not necessarily in all tests, but at least some (povray, h264, bzip2). They can surely fit into 1 chart.

    What do you think?

  2. #2
    Join Date
    May 2007
    Location
    Third Rock from the Sun
    Posts
    6,532

    Default

    Quote Originally Posted by vmicho View Post
    Hello.
    It would be more interesting to add some solo CPU tests when benchmarking multi-core-CPUs.
    It is today nearly impossible to see in benchmarks how fast is one core. The majority of cpu tasks are still single core today.

    Here is an example:
    http://www.phoronix.com/scan.php?pag...amd_2010&num=6
    Well we see how well povray renders on 8 cores. But how well it is with 1 thread, 2 threads, 12 threads (more threads than cores)? Are 8 threads ~8x faster than 1 (thus we can see the effectivity of this solution)?

    Another here:
    http://www.phoronix.com/scan.php?pag...rei3_530&num=7
    It would be very interesting to have results for 1,2,4,6,8 threads for each processor. Not necessarily in all tests, but at least some (povray, h264, bzip2). They can surely fit into 1 chart.

    What do you think?
    There already many tests in PTS that are only single threaded and should give you an indication.

  3. #3
    Join Date
    Apr 2008
    Posts
    325

    Default

    I think he is actually asking for a benchmark of the quad core running a multi-thread application with only one thread, with 2 threads, with 4 threads, ...

    This is actually an interesting question, as it is the key to how efficient the multi-core implementation is. Linear speed up, if it's seen, would be a huge display, but I suspect it is going to be markedly less than linear.

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