On Tue, Mar 13, 2007 at 09:19:08PM +0100, Martin wrote: > > Also some more discussion would be useful, e.g. you appear to be > > testing on different machines so the most important thing to > > understand is how, or whether, the hardware differs. You do link to > > the dmesgs, but it's hard to process this into a summary form whereas > > you presumably know the details. > > > I use the same hw (3 dell 1435 server) > > > > I am also unfamiliar with the benchmark itself, can you give me a > > pointer to the software? > > I used sql-bench > /usr/ports/databases/mysql50-server/work/mysql-5.0.33/sql-bench/ > (at this time) > the default Makefile of port have "--without-bench" options so u need > to make manually
Hmm. This seems to be a single-user test, so while it's presumably testing some relevant basic ingredients of database performance it's probably not a realistic measure of server performance. i.e. if you really only have a maximum of one client accessing your database then your 4-core system is being more than 75% wasted :) > > If it is doing disk I/O then you may be > > mostly measuring the speed of your disks, which is why the previous > > paragraph is so important to understand. > > the disk was the same of 3 test OK, cool. The difference between i386 and amd64 is actually kind of surprising. I would have expected amd64 to be slower. One thing that is missing is an estimate of standard deviation of the data points: some benchmarks have very high variance, meaning the numbers vary a lot between runs; this makes direct comparison more difficult without statistical work. In FreeBSD the /usr/src/tools/tools/ministat utility is excellent for this purpose. Kris
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