I just made another test with a second Gentoo machine: Pentium 4 3.0Ghz Prescott GCC 4.1.1 Glibc 2.4 PostgreSQL 8.1.5 Kernel 2.6.17 Same postgresql.conf as yesterday's. First test ========== GLIBC: -O2 -march=i686 PostgreSQL: -O2 -march=i686 Results: 974.638731 975.602142 975.882051 969.142503 992.914167 983.467131 983.231575 994.901330 970.375221 978.377467 Average (error): 980 tps (13 tps) Second test =========== GLIBC: -O2 -march=i686 PostgreSQL: -O2 -march=prescott Results: 988.319643 976.152973 1006.482553 992.431322 983.090838 992.674065 989.216746 990.897615 987.129802 975.907955 Average (error): 988 tps (15 tps) Third test ========== GLIBC: -O2 -march=prescott PostgreSQL: -O2 -march=i686 Results: 969.085400 966.187309 994.882325 968.715150 956.766771 970.151542 960.090571 967.680628 986.568462 991.756520 Average (error): 973 tps (19 tps) Forth test ========== GLIBC: -O2 -march=prescott PostgreSQL: -O2 -march=prescott Results: 980.888371 978.128269 969.344669 978.021509 979.256603 993.236457 984.078399 981.654834 976.295925 969.796277 Average (error): 979 tps (11 tps) The results showed no significant change. The conclusion of today's test would be that there are no improvement at PostgreSQL when using -march=prescott. I only see 3 diferences between yesterday's server and today's: the kernel version (y: 2.6.18, t:2.6.17), the server uses an IDE harddrive (yesterday was SATA), and the gcc version (3.4.6 -> 4.1.1). I don't know why yesterday we had improved and today we had not. Best Daniel On 12/12/06, Daniel van Ham Colchete <daniel.colchete@xxxxxxxxx> wrote:
I'm making some other tests here at another hardware (also Gentoo). I found out that PostgreSQL stops for a while if I change the -t parameter on bgbench from 600 to 1000 and I have ~150 tps instead of ~950tps.
