Re: postgresql-performance using sysbench

At 03:46 PM 1/28/2008, Claus Guttesen wrote:

I had (allready) saved the thread in my mail-account so I could look
it up before I started testing. :-) So I compiled postgresql with the
option WITH_THREADSAFE=true and used sysbench with --pgsql-host="" .
As pointed out by Ivan my test also involved r/w whereas the thread
you (probably) mention at
http://groups.google.com/group/mailing.freebsd.stable/browse_thread/thread/e224cd4f76e9ec2d
is a read-only test.

I forgot to mention in my first post that I'm using ULE. The p800
controller has a (factory set) 25/75 read/write cache ratio.


I am still going through my own testing. One thing I noticed, on a 4G RAM machine (still waiting for the RAM to test with 8G), the disks are not that busy. It seems to be the CPU that is the bottleneck on FreeBSD. I tried the test with 900,000 rows instead.

procs memory page disks faults cpu
r b w avm fre flt re pi po fr sr ad5 da0 in sy cs us sy id
38 1 0 271024 3439656 6329 0 0 0 4 0 0 1703 1709 120725 41505 44 18 37
0 38 0 271024 3438860 9590 0 0 0 8 0 0 1932 1938 183844 47958 70 28 3
6 33 0 271024 3438120 7814 0 0 0 0 0 0 1823 1827 169969 44914 62 25 13
39 0 0 271024 3437960 1530 0 0 0 0 0 0 994 998 36521 14927 13 8 79
38 1 0 271024 3437244 7374 0 0 0 0 0 0 2724 2731 173493 51821 71 20 9
0 39 0 271024 3436620 4773 0 0 0 8 0 0 2727 2734 125699 39962 47 20 33
37 1 0 271024 3435836 6884 0 0 0 8 0 0 2796 2804 177453 58430 70 26 4

I am also using ULE, pgsql with WITH_THREADSAFE=true and not using TCP to connect. How busy were your disks in your testing ?

---Mike


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