[ resend with fixed mail headers, sorry ] > From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx> > > Here's third RFC. Thanks everybody for feedback. > > The patchset is pretty big already and I want to stop generate new > features to keep it reviewable. Next I'll concentrate on benchmarking and > tuning. Okay, here's first test results for the patchset (I did few minor fixes). I run iozone using mmap files (-B) with different number of threads. The test machine is 4s Westmere - 4x10 cores + HT. ** Initial writers ** threads: 1 2 4 8 16 32 64 128 256 baseline: 1103360 912585 500065 260503 128918 62039 34799 18718 9376 patched: 2127476 2155029 2345079 1942158 1127109 571899 127090 52939 25950 speed-up(times): 1.93 2.36 4.69 7.46 8.74 9.22 3.65 2.83 2.77 ** Rewriters ** threads: 1 2 4 8 16 32 64 128 256 baseline: 1391599 1167340 1040505 484431 225883 108426 53239 28133 15007 patched: 2284535 1943774 2245681 1288542 438100 308559 115641 64990 30638 speed-up(times): 1.64 1.67 2.16 2.66 1.94 2.85 2.17 2.31 2.04 ** Readers ** threads: 1 2 4 8 16 32 64 128 256 baseline: 1344180 1339641 1094513 604079 273020 129403 76666 41785 20111 patched: 1790010 1807535 2039022 1884901 1470841 874517 429414 207033 99853 speed-up(times): 1.33 1.35 1.86 3.12 5.39 6.76 5.60 4.95 4.97 ** Re-readers ** threads: 1 2 4 8 16 32 64 128 256 baseline: 1402398 1239448 1105293 653823 273997 130629 75943 40588 20456 patched: 1928768 2076134 1791750 1907793 1494477 876014 432898 207279 102002 speed-up(times): 1.38 1.68 1.62 2.92 5.45 6.71 5.70 5.11 4.99 ** Reverse readers ** threads: 1 2 4 8 16 32 64 128 256 baseline: 1545930 1443504 1175183 604320 277178 128694 76734 40956 20345 patched: 1907933 1827041 1919202 1734568 1497661 862046 429960 208326 93213 speed-up(times): 1.23 1.27 1.63 2.87 5.40 6.70 5.60 5.09 4.58 ** Random_readers ** threads: 1 2 4 8 16 32 64 128 256 baseline: 1069364 968029 887646 570211 257909 124713 74354 40663 20213 patched: 1881762 2144045 1989631 2057963 1560892 867901 424109 205934 98021 speed-up(times): 1.76 2.21 2.24 3.61 6.05 6.96 5.70 5.06 4.85 ** Random_writers ** threads: 1 2 4 8 16 32 64 128 256 baseline: 1236302 1033694 882697 475439 231973 113590 65675 35458 17890 patched: 2778110 2484373 2454243 1329193 706394 353300 173871 86194 42815 speed-up(times): 2.25 2.40 2.78 2.80 3.05 3.11 2.65 2.43 2.39 Minimal speed up is in 1-thread reverse readers - 23%. Maximal is 9.2 times in 32-thread initial writers. It's probably due batched radix tree insert - we insert 512 pages a time. It reduces mapping->tree_lock contention. I wounder why rewriters are slower then initial writers. Readers also slower then initial writers for low number of threads. It requires further investigation. In overall looks pretty impressive to me. :) -- Kirill A. Shutemov -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>