How to get fp events and fp ops per second in skylake?

perf-fp-counters

Followed this tutorial:

http://www.bnikolic.co.uk/blog/hpc-howto-measure-flops.html



    Get the latest version of perfmon2/libpfm (h/t this developerworks article):

    git clone git://perfmon2.git.sourceforge.net/gitroot/perfmon2/libpfm4
    cd libpfm4
    make

    Run the showevtinfo program (in examples subdirectory) to get a list of all available events, and the masks and modifiers that are supported (see the output below for an example of the full output)

    Figure out what events and what with masks and modifiers you want to use. The masks are prefixed by Umask and are given as hexadecimal numbers and also symbolic names in the square brackets. The modifiers are prefixed by Modif and their names are also in square brackets.

    Use the check_events program (also in examples sub-directory) to convert the event, umask and modifiers into a raw code. You can do this by running the command as:

    check_events <event name>:<umask>[(:modifers)*]

    i.e., you supply the event name, the umask and multiple modifiers all separated by the colon character. The program will then print out, amongst other things, an raw event specification, for example:

    Codes          : 0x531003

    This hexadecimal code can be used as parameter to GNU.Linux perf tools, for example to perf stat by supplying it with -e r531003 option



FP events to profile:

FP_ARITH:SCALAR_DOUBLE 
FP_ARITH:SCALAR_SINGLE
FP_ARITH:128B_PACKED_DOUBLE
FP_ARITH:128B_PACKED_SINGLE
FP_ARITH:256B_PACKED_DOUBLE
FP_ARITH:256B_PACKED_SINGLE
FP_ARITH:512B_PACKED_DOUBLE
FP_ARITH:512B_PACKED_SINGLE

Getting the codes
FP_ARITH:SCALAR_DOUBLE FP_ARITH:SCALAR_SINGLE FP_ARITH:128B_PACKED_DOUBLE FP_ARITH:128B_PACKED_SINGLE FP_ARITH:256B_PACKED_DOUBLE FP_ARITH:256B_PACKED_SINGLE FP_ARITH:512B_PACKED_DOUBLE FP_ARITH:512B_PACKED_SINGLE

./check_events FP_ARITH:SCALAR_DOUBLE FP_ARITH:SCALAR_SINGLE FP_ARITH:128B_PACKED_DOUBLE FP_ARITH:128B_PACKED_SINGLE FP_ARITH:256B_PACKED_DOUBLE FP_ARITH:256B_PACKED_SINGLE FP_ARITH:512B_PACKED_DOUBLE FP_ARITH:512B_PACKED_SINGLE | grep Codes
    Requested Event: FP_ARITH:SCALAR_DOUBLE
    Actual    Event: skl::FP_ARITH_INST_RETIRED:SCALAR_DOUBLE:k=1:u=1:e=0:i=0:c=0:t=0:intx=0:intxcp=0
    PMU            : Intel Skylake
    IDX            : 419430470
    Codes          : 0x5301c7
    Requested Event: FP_ARITH:SCALAR_SINGLE
    Actual    Event: skl::FP_ARITH_INST_RETIRED:SCALAR_SINGLE:k=1:u=1:e=0:i=0:c=0:t=0:intx=0:intxcp=0
    PMU            : Intel Skylake
    IDX            : 419430470
    Codes          : 0x5302c7
    Requested Event: FP_ARITH:128B_PACKED_DOUBLE
    Actual    Event: skl::FP_ARITH_INST_RETIRED:128B_PACKED_DOUBLE:k=1:u=1:e=0:i=0:c=0:t=0:intx=0:intxcp=0
    PMU            : Intel Skylake
    IDX            : 419430470
    Codes          : 0x5304c7
    Requested Event: FP_ARITH:128B_PACKED_SINGLE
    Actual    Event: skl::FP_ARITH_INST_RETIRED:128B_PACKED_SINGLE:k=1:u=1:e=0:i=0:c=0:t=0:intx=0:intxcp=0
    PMU            : Intel Skylake
    IDX            : 419430470
    Codes          : 0x5308c7
    Requested Event: FP_ARITH:256B_PACKED_DOUBLE
    Actual    Event: skl::FP_ARITH_INST_RETIRED:256B_PACKED_DOUBLE:k=1:u=1:e=0:i=0:c=0:t=0:intx=0:intxcp=0
    PMU            : Intel Skylake
    IDX            : 419430470
    Codes          : 0x5310c7
    Requested Event: FP_ARITH:256B_PACKED_SINGLE
    Actual    Event: skl::FP_ARITH_INST_RETIRED:256B_PACKED_SINGLE:k=1:u=1:e=0:i=0:c=0:t=0:intx=0:intxcp=0
    PMU            : Intel Skylake
    IDX            : 419430470
    Codes          : 0x5320c7
    Requested Event: FP_ARITH:512B_PACKED_DOUBLE
    Actual    Event: skl::FP_ARITH_INST_RETIRED:512B_PACKED_DOUBLE:k=1:u=1:e=0:i=0:c=0:t=0:intx=0:intxcp=0
    PMU            : Intel Skylake
    IDX            : 419430470
    Codes          : 0x5340c7
    Requested Event: FP_ARITH:512B_PACKED_SINGLE
    Actual    Event: skl::FP_ARITH_INST_RETIRED:512B_PACKED_SINGLE:k=1:u=1:e=0:i=0:c=0:t=0:intx=0:intxcp=0
    PMU            : Intel Skylake
    IDX            : 419430470
    Codes          : 0x5380c7


perf stat -e r5301c7 -e r5302c7 -e r5304c7 -e r5308c7 -e r5310c7 -e r5320c7 -e r5340c7 -e r5380c7 -- ./main


output:
 Performance counter stats for './main':

         202502044      r5301c7                                                       (49.86%)
               749      r5302c7                                                       (49.94%)
                 2      r5304c7                                                       (50.01%)
                 2      r5308c7                                                       (50.09%)
                 0      r5310c7                                                       (50.14%)
                 0      r5320c7                                                       (50.06%)
                 0      r5340c7                                                       (49.99%)
                 0      r5380c7                                                       (49.91%)

       5.268380671 seconds time elapsed
       
modified outuput:
 Performance counter stats for './main':                                           
                                                                                   
         202502044      FP_ARITH:SCALAR_DOUBLE                                     
               749      FP_ARITH:SCALAR_SINGLE                                     
                 2      FP_ARITH:128B_PACKED_DOUBLE                                
                 2      FP_ARITH:128B_PACKED_SINGLE                                
                 0      FP_ARITH:256B_PACKED_DOUBLE                                
                 0      FP_ARITH:256B_PACKED_SINGLE                                
                 0      FP_ARITH:512B_PACKED_DOUBLE                                
                 0      FP_ARITH:512B_PACKED_SINGLE                                
                                                                                   
                 202,502,797 total FP operation events                             
                                                                                   
       5.268380671 seconds time elapsed