On Tue, 17 Jul 2012, Michael Hase wrote:
To work around these caching effects just use a file > 2 times the size of
ram, iostat then shows the numbers really coming from disk. I always test
like this. a re-read rate of 8.2 GB/s is really just memory bandwidth, but
quite impressive ;-)
Ok, the iozone benchmark finally completed. The results do suggest
that reading from mirrors substantially improves the throughput.
This is interesting since the results differ (better than) from my
'virgin mount' test approach:
Command line used: iozone -a -i 0 -i 1 -y 64 -q 512 -n 8G -g 256G
KB reclen write rewrite read reread
8388608 64 572933 1008668 6945355 7509762
8388608 128 2753805 2388803 6482464 7041942
8388608 256 2508358 2331419 2969764 3045430
8388608 512 2407497 2131829 3021579 3086763
16777216 64 671365 879080 6323844 6608806
16777216 128 1279401 2286287 6409733 6739226
16777216 256 2382223 2211097 2957624 3021704
16777216 512 2237742 2179611 3048039 3085978
33554432 64 933712 699966 6418428 6604694
33554432 128 459896 431640 6443848 6546043
33554432 256 444490 430989 2997615 3026246
33554432 512 427158 430891 3042620 3100287
67108864 64 426720 427167 6628750 6738623
67108864 128 419328 422581 6666153 6743711
67108864 256 419441 419129 3044352 3056615
67108864 512 431053 417203 3090652 3112296
134217728 64 417668 55434 759351 760994
134217728 128 409383 400433 759161 765120
134217728 256 408193 405868 763892 766184
134217728 512 408114 403473 761683 766615
268435456 64 418910 55239 768042 768498
268435456 128 408990 399732 763279 766882
268435456 256 413919 399386 760800 764468
268435456 512 410246 403019 766627 768739
Bob
--
Bob Friesenhahn
bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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