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Subject[MMTests] dbench4 async on ext4
Configuration:	global-dhp__io-dbench4-async-ext4
Result: http://www.csn.ul.ie/~mel/postings/mmtests-20120424/global-dhp__io-dbench4-async-ext4
Benchmarks: dbench4

Summary
=======
Nothing majorly exciting although throughput has been declining
slightly in a number of cases. However, this is not consistent
between machines and latency has also been variable. Broadly
speaking, there is not need to take any action here.

Benchmark notes
===============
mkfs was run on system startup. No attempt was made to age it. No
special mkfs or mount options were used.

dbench 4 was used. Tests ran for 180 seconds once warmed up. A varying
number of clients were used up to 64*NR_CPU. osync, sync-directory and
fsync were all off.

===========================================================
Machine: arnold
Result: http://www.csn.ul.ie/~mel/postings/mmtests-20120424/global-dhp__io-dbench4-async-ext4/arnold/comparison.html
Arch: x86
CPUs: 1 socket, 2 threads
Model: Pentium 4
Disk: Single Rotary Disk
===========================================================
dbench4
-------
In very vague terms, throughput has been getting worse over time but
it's very gradual. Latency has also been getting worse.

==========================================================
Machine: hydra
Result: http://www.csn.ul.ie/~mel/postings/mmtests-20120424/global-dhp__io-dbench4-async-ext4/hydra/comparison.html
Arch: x86-64
CPUs: 1 socket, 4 threads
Model: AMD Phenom II X4 940
Disk: Single Rotary Disk
Status: Ok
==========================================================
dbench4
-------
This is a mixed bag, there are gains and losses and it's hard to draw
any meaningful conclusion.

==========================================================
Machine: sandy
Result: http://www.csn.ul.ie/~mel/postings/mmtests-20120424/global-dhp__io-dbench4-async-ext4/sandy/comparison.html
Arch: x86-64
CPUs: 1 socket, 8 threads
Model: Intel Core i7-2600
Disk: Single Rotary Disk
Status:
==========================================================
dbench4
-------
For the most part, there are few changes of note. Latency has
been getting better particularly in 3.2 and later kernels.

--
Mel Gorman
SUSE Labs


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