SZUCS Gábor wrote: > Alexandre, > > I missed your orig. post, but AFAIK multiprocessing kernels will handle HT > CPUs as 2 CPUs each. Thus, our dual Xeon 2.4 is recognized as 4 Xeon 2.4 > CPUs. > > This way, I don't think HT would improve any single query (afaik no postgres > process uses more than one cpu), but overall multi-query performance has to > improve.
When you use hyperthreading, each virtual cpu runs at 70% of a full CPU, so hyperthreading could be slower than non-hyperthreading. On a fully loaded dual cpu system, you are looking at 2.8 cpu's (0.70 * 4), while if it isn't loaded, you are looking at slowing down if you are only using 1 or 2 cpu's. -- Bruce Momjian | http://candle.pha.pa.us [EMAIL PROTECTED] | (610) 359-1001 + If your life is a hard drive, | 13 Roberts Road + Christ can be your backup. | Newtown Square, Pennsylvania 19073 ---------------------------(end of broadcast)--------------------------- TIP 6: Have you searched our list archives? http://archives.postgresql.org
