Re: [RFC] extents support for EXT3
From: Alex Tomas
Date: Fri Aug 29 2003 - 13:05:41 EST
>>>>> Ed Sweetman (ES) writes:
ES> Throughput 221.812 MB/sec 16 procs ext2
ES> Throughput 159.495 MB/sec 16 procs ext3-extents (definitely enabled)
ES> Throughput 147.598 MB/sec 16 procs ext3 (patched but disabled)
ES> There is an obvious improvement, but nothing near the 70+% increase
ES> you saw. Subsequent runs run anything from a little lower than above
ES> for extents to 167MB/s.
it seems one of my scsi drive is a bit broken (caching, at least).
sorry for invalid numbers. on another drive I see following:
w/o extents:
[root@zefir root]# /root/db2.sh 2 16
Throughput 119.199 MB/sec 16 procs
Throughput 106.09 MB/sec 16 procs
Average: 112.64450
with extents:
[root@zefir root]# /root/db2.sh 2 16
Throughput 156.846 MB/sec 16 procs
Throughput 170.591 MB/sec 16 procs
Average: 163.71850
so, this time improvement is about 45%
I can't explain this yet. need to be investigated carefully
ES> By the way, what's the behavior of opening an existing non-extent file
ES> and writing and reading to it while the partition is mounted with
ES> extents enabled?
those files are handled usual way
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