On 21/04/2010 04:43, Ben Rockwood wrote:
I'm doing a little research study on ZFS benchmarking and performance
profiling. Like most, I've had my favorite methods, but I'm
re-evaluating my choices and trying to be a bit more scientific than I
have in the past.
To that end, I'm curious if folks wouldn't mind sharing their work on
the subject? What tool(s) to you prefer in what situations? Do you
have a standard method of running them (tool args; block sizes, thread
counts, ...) or procedures between runs (zpool import/export, new
dataset creation,...)? etc.
Any feedback is appreciated. I want to get a good sampling of opinions.
I haven't heard from you in a while! Good to see you here again :)
Sorry for stating obvious but at the end of a day it depends on what
your goals are.
Are you interested in micro-benchmarks and comparison to other file systems?
I think the most relevant filesystem benchmarks for users is when you
benchmark a specific application and present results from an application
point of view. For example, given a workload for Oracle, MySQL, LDAP,
... how quickly it completes? How much benefit there is by using SSDs?
What about other filesystems?
Micro-benchmarks are fine but very hard to be properly interpreted by
most users.
Additionally most benchmarks are almost useless if they are not compared
to some other configuration with only a benchmarked component changed.
For example, knowing that some MySQL load completes in 1h on ZFS is
basically useless. But knowing that on the same HW with Linux/ext3 and
under the same load it completes in 2h would be interesting to users.
Other interesting thing would be to see an impact of different ZFS
setting on a benchmark results (aligned recordsize for database vs.
default, atime off vs. on, lzjb, gzip, ssd). Also comparison of
benchmark results with all default zfs setting compared to whatever
setting you did which gave you the best result.
--
Robert Milkowski
http://milek.blogspot.com
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