Alan Stange wrote:
Here's a few numbers from the Opteron 250. If I get some time I'll post a more comprehensive comparison including some other systems.
The system is a Sun v20z. Dual Opteron 250, 2.4Ghz, Linux 2.6, 8 GB memory. I did a compile and install of pg 8.0 beta 3. I created a data base on a tmpfs file system and ran pgbench. Everything was "out of the box", meaning I did not tweak any config files.
I used this for pgbench: $ pgbench -i -s 32
and this for pgbench invocations: $ pgbench -s 32 -c 1 -t 10000 -v
clients tps 1 1290 2 1780 4 1760 8 1680 16 1376 32 904
The same test on a Dell PowerEdge 1750, Dual Xeon 3.2 GHz, 512k cache, HT on, Linux 2.4.21-20.ELsmp (RHEL 3), 4GB memory, pg 7.4.5:
$ pgbench -i -s 32 pgbench $ pgbench -s 32 -c 1 -t 10000 -v
clients tps avg CS/sec
------- ----- ----------
1 601 48,000
2 889 77,000
4 1006 80,000
8 985 59,000
16 966 47,000
32 913 46,000Far less performance that the Dual Opterons with a low number of clients, but the gap narrows as the number of clients goes up. Anyone smarter than me care to explain?
Anyone have a 4-way Opteron to run the same benchmark on?
-Bill
How are these results useful? In some sense, this is a speed of light number for the Opteron 250. You'll never go faster on this system with a real storage subsystem involved instead of a tmpfs file system. It's also a set of numbers that anyone else can reproduce as we don't have to deal with any differences in file systems, disk subsystems, networking, etc. Finally, it's a set of results that anyone else can compute on Xeon's or other systems and make a simple (and naive) comparisons.
Just to stay on topic: vmstat reported about 30K cs / second while this was running the 1 and 2 client cases.
-- Alan
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