[ re-adding bug-coreutils]
On Wed, 26 Sep 2007, Ken Naim wrote:
I created a test case similar to my nightly job which removes 130 or
so 5gb files. The apps* files are identical to files I remove nightly
and are 4.3 gb in size, the ctx files are 20mb, and the single letter
files are 0 byte files. Based on the strace there is a correlation
between file size and unlink time. 4.3gb takes 10 seconds, 20mb take
less than .1 seconds and 0 byte files take no time.
unlink("apps_ts_tx_data_2.270.632954231") = 0 <10.418224>
unlink("apps_ts_tx_data_2.271.632954231") = 0 <10.691083>
unlink("ctxd.367.632955010") = 0 <0.051140>
unlink("ctxd.367.632955011") = 0 <0.078666>
unlink("d") = 0 <0.000059>
unlink("e") = 0 <0.000050>
As I thought, rm is limited by the speed of the underlying I/O. I'd
suggest some performance tuning for your filesystem and SAN, but that's
very dependent on your current setup. unlink shouldn't cause much I/O
compared to other read/write operations, so I'm surprised you only
noticed issues with rm.
Cheers,
Phil
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