forked from jengelh/xxhash
112 lines
3.9 KiB
Plaintext
112 lines
3.9 KiB
Plaintext
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=== test ===
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standard openSUSE xxhash packages of today
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$ make
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cat linux-6.*.tar{,,,,,,,} | time ./xh
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5df8e93736b5a2bddd0b324a455b61fc
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3.24user 6.69system 0:13.69elapsed 72%CPU (0avgtext+0avgdata 3824maxresident)k
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0inputs+0outputs (0major+178minor)pagefaults 0swaps
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14:04 f3:../xx/xxhash $ make
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cat linux-6.*.tar{,,,,,,,} | time ./xh
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5df8e93736b5a2bddd0b324a455b61fc
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3.29user 6.05system 0:13.04elapsed 71%CPU (0avgtext+0avgdata 3720maxresident)k
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0inputs+0outputs (0major+178minor)pagefaults 0swaps
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14:05 f3:../xx/xxhash $ make
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cat linux-6.*.tar{,,,,,,,} | time ./xh
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5df8e93736b5a2bddd0b324a455b61fc
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3.20user 6.29system 0:13.19elapsed 72%CPU (0avgtext+0avgdata 3664maxresident)k
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0inputs+0outputs (0major+177minor)pagefaults 0swaps
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14:05 f3:../xx/xxhash $ make
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cat linux-6.*.tar{,,,,,,,} | time ./xh
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5df8e93736b5a2bddd0b324a455b61fc
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3.38user 5.91system 0:12.89elapsed 72%CPU (0avgtext+0avgdata 3712maxresident)k
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0inputs+0outputs (0major+178minor)pagefaults 0swaps
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Mean/Spread: 13.20 ± 0.31 sec (2.3% error)
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=== switch packages ===
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# rpm -U ...
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=== verify AVX512 is now in use ===
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Watch this space closely.
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$ gdb xh
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Reading symbols from xh...
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(gdb) b main
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Breakpoint 1 at 0x4010b0: file xh.cpp, line 7.
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(gdb) r <xh.cpp
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Starting program: /home/jengelh/obs_nosave/zu/home/jengelh/xx/xxhash/xh <xh.cpp
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[Thread debugging using libthread_db enabled]
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Using host libthread_db library "/lib64/libthread_db.so.1".
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Breakpoint 1, main () at xh.cpp:7
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7 auto state = XXH3_createState();
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(gdb) b XXH_setDispatch
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Breakpoint 2 at 0x7ffff7f9a6f4: file /usr/src/debug/xxHash-0.8.2/xxh_x86dispatch.c, line 706.
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(gdb) r
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Restart?-yes
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Starting program: /home/jengelh/obs_nosave/zu/home/jengelh/xx/xxhash/xh <xh.cpp
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[Thread debugging using libthread_db enabled]
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Using host libthread_db library "/lib64/libthread_db.so.1".
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Breakpoint 2, XXH_setDispatch () at /usr/src/debug/xxHash-0.8.2/xxh_x86dispatch.c:706
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706 {
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(gdb) bt
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#0 XXH_setDispatch () at /usr/src/debug/xxHash-0.8.2/xxh_x86dispatch.c:706
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#1 0x00007ffff7fca53e in call_init (env=0x7fffffffd998, argv=0x7fffffffd988, argc=1, l=<optimized out>) at dl-init.c:74
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#2 call_init (l=<optimized out>, argc=1, argv=0x7fffffffd988, env=0x7fffffffd998) at dl-init.c:26
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#3 0x00007ffff7fca63c in _dl_init (main_map=0x7ffff7fbe000, argc=1, argv=0x7fffffffd988, env=0x7fffffffd998) at dl-init.c:121
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#4 0x00007ffff7fe2ba0 in _dl_start_user () from /lib64/ld-linux-x86-64.so.2
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#5 0x0000000000000001 in ?? ()
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#6 0x00007fffffffde8c in ?? ()
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#7 0x0000000000000000 in ?? ()
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(gdb) n
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707 int vecID = XXH_featureTest();
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(gdb)
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719 XXH_g_dispatch = XXH_kDispatch[vecID];
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(gdb) p vecID
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$1 = 3 [= XXH_AVX512!]
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=== test ===
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$ make test
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cat linux-6.*.tar{,,,,,,,} | time ./xh
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5df8e93736b5a2bddd0b324a455b61fc
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3.37user 6.16system 0:13.23elapsed 72%CPU (0avgtext+0avgdata 3708maxresident)k
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0inputs+0outputs (0major+177minor)pagefaults 0swaps
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14:07 f3:../xx/xxhash $ make test
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cat linux-6.*.tar{,,,,,,,} | time ./xh
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5df8e93736b5a2bddd0b324a455b61fc
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3.23user 6.27system 0:13.27elapsed 71%CPU (0avgtext+0avgdata 3664maxresident)k
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0inputs+0outputs (0major+176minor)pagefaults 0swaps
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14:07 f3:../xx/xxhash $ make test
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cat linux-6.*.tar{,,,,,,,} | time ./xh
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5df8e93736b5a2bddd0b324a455b61fc
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3.26user 6.77system 0:13.75elapsed 73%CPU (0avgtext+0avgdata 3712maxresident)k
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0inputs+0outputs (0major+178minor)pagefaults 0swaps
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14:07 f3:../xx/xxhash $ make test
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cat linux-6.*.tar{,,,,,,,} | time ./xh
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5df8e93736b5a2bddd0b324a455b61fc
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3.19user 6.07system 0:12.96elapsed 71%CPU (0avgtext+0avgdata 3712maxresident)k
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0inputs+0outputs (0major+178minor)pagefaults 0swaps
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Mean/Spread: 13.30 ± 0.34s (2.5% error)
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== Lessons learned ==
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Prerequisite for good measurement:
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* consistent(!) error rate (4 individual measurements is a bit on the low side, but ... anyway)
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Result:
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* The observed 13.2s mean is within the margin of measurement error of the 13.3 mean and viceversa
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Conclusion:
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* DISPATCH=1 made no impact on this machine
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