On 10-12-06 09:00 PM, Josh Berkus wrote:
Steve,
If you tell me which options to pgbench and which .conf file settings
you'd like to see I can probably arrange to run some tests on AIX.
Compile and run test_fsync in PGSRC/src/tools/fsync.
Attached are runs against two different disk sub-systems from a server
running AIX 5.3.
The first one is against the local disks
Loops = 10000
Simple write:
8k write 60812.454/second
Compare file sync methods using one write:
open_datasync 8k write 162.160/second
open_sync 8k write 158.472/second
8k write, fdatasync 158.157/second
8k write, fsync 45.382/second
Compare file sync methods using two writes:
2 open_datasync 8k writes 79.472/second
2 open_sync 8k writes 80.095/second
8k write, 8k write, fdatasync 159.268/second
8k write, 8k write, fsync 44.725/second
Compare open_sync with different sizes:
open_sync 16k write 162.017/second
2 open_sync 8k writes 79.709/second
Test if fsync on non-write file descriptor is honored:
(If the times are similar, fsync() can sync data written
on a different descriptor.)
8k write, fsync, close 45.361/second
8k write, close, fsync 36.311/second
================================
The below profile is from the same machine using an IBM DS 6800 SAN for
storage.
Loops = 10000
Simple write:
8k write 75933.027/second
Compare file sync methods using one write:
open_datasync 8k write 2762.801/second
open_sync 8k write 2453.822/second
8k write, fdatasync 2867.331/second
8k write, fsync 1094.048/second
Compare file sync methods using two writes:
2 open_datasync 8k writes 1287.845/second
2 open_sync 8k writes 1332.084/second
8k write, 8k write, fdatasync 1966.411/second
8k write, 8k write, fsync 1048.354/second
Compare open_sync with different sizes:
open_sync 16k write 2281.425/second
2 open_sync 8k writes 1401.561/second
Test if fsync on non-write file descriptor is honored:
(If the times are similar, fsync() can sync data written
on a different descriptor.)
8k write, fsync, close 1298.404/second
8k write, close, fsync 1188.582/second
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