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Tue, 25 Mar 2008

Second filesystem contest is over.

Although I plan to run additional couple of tests for btrfs, namely all tests for nodatacow option and without ssd option, which will likely take part of the day. But all others were already completed, so expect nice graphs tomorrow.

There was number of surprises during that testing. For example reiser4 constantly freezes the test box in dbench workload with 150-200 threads. There are no messages in dmesg, but nothing is turned on in kernel hacking section of the config. Both btrfs and reiser4 are very slow creating and writing into lots of small (4k) files. Reiser4 is two times faster than btrfs, the latter creates/writes/syncs/closes about 10 files per second average when 10k-30k files are created one-by-one.
Ext4 is also slower than any other (except above two) filesystem in this microbenchmark. Something strange was made during 2.6.20-2.6.24 kernel: above file creation microbenchmark produced much worse results for all filesystems (magnitude of 10 in some cases) compared to previous contest. Maybe sync code was implemented correctly, I do not know...

I will likely drop maildir benchmark results, since perl script which works there constantly tells me, that fsync() has invalid parameter...

So, wait about 12 hours (I have to have some sleep: do not mix absinthe with different red wines and beer, when I did that yesterday/today night, it was quite tasty, but not todays morning)

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