[Gems-users] slow down using pthreads

["Brad Moore" <brad.t.moore@xxxxxxxxx>]

Hey all,

I've been going through a bunch of the "too slow" threads, and I haven't been able to figure out if people
solved their issues, or just dealt with it being slow.

I've been working with MSI_MOSI_CMP_directory, on Sarek, with 64 cores/processors on a single chip.

I have a benchmark I've run (using pthreads).  It spawns two threads, and then the main thread
waits for their completion.  Each thread executes an empty function.

The execution took 8hrs, here's a clip of the stats file:

Total_misses: 9769
total_misses: 9769 [ 1909 74 61 63 60 57 61 67 58 64 61 65 71 60 56 64 59 60 59 
66 60 62 60 694 5595 5 5 5 6 5 5 4 5 5 5 6 5 6 6 5 5 6 5 5 5 5 6 5 6 4 6 4 5 6 6
 5 5 5 6 4 6 4 6 5 ]
user_misses: 862 [ 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 147 715 0 0 0 0
 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ]
supervisor_misses: 8907 [ 1909 74 61 63 60 57 61 67 58 64 61 65 71 60 56 64 59 6
0 59 66 60 62 60 547 4880 5 5 5 6 5 5 4 5 5 5 6 5 6 6 5 5 6 5 5 5 5 6 5 6 4 6 4 
5 6 6 5 5 5 6 4 6 4 6 5 ]

instruction_executed: 1297255830 [ 742697 20746903 20744087 20750036 20753361 20
762925 20744119 20734758 20751076 20741291 20745643 20741295 20704298 20755676 2
0764321 20749043 20750176 20759319 20753849 20733527 20750740 20743099 20571572 
17260854 435687 21096508 21096659 21095505 21094517 21096362 21096307 21097062 2
1094905 21096437 21095760 21094580 21097473 21096164 21095831 21095639 21095560 
21094589 21095370 21095410 21096449 21095421 21095607 21096475 21094764 21096264
 21094548 21096134 21095489 21095448 21095393 21095571 21095687 21095840 2109483
6 21097020 21094194 21097636 21094171 20927893 ]

Thanks,
-Brad