I should have allowed the iozone run to go futher. What is really
interesting is that performance is very much tied to file size:
KB reclen write rewrite read reread
33554432 64 76688 27870 552106 555438
33554432 128 103120 369527 538206 555049
33554432 256 355237 366563 534333 553660
33554432 512 379515 364515 535635 553940
67108864 64 354186 41313 553426 555094
67108864 128 354590 352197 551686 555935
67108864 256 357401 351549 552545 556920
67108864 512 359299 356335 551557 555180
This machine has 20GB of RAM and I notice that arcsz is frozen at 10GB
during the benchmark. Notice that with the 32GB file the performance
is very poor with short record lengths but for some reason performance
becomes very nice with all tested record lengths with a file size of
64GB.
I am running across a broader span of file sizes now to see what is
going on.
Bob
--
Bob Friesenhahn
bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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