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REINDEX using only 1 CPU (of 2)

From: ogjunk-pgjedan(at)yahoo(dot)com
To: pgsql-admin(at)postgresql(dot)org
Subject: REINDEX using only 1 CPU (of 2)
Date: 2007-04-14 00:55:04
Message-ID: 532476.32746.qm@web50303.mail.re2.yahoo.com (view raw or flat)
Thread:
Lists: pgsql-admin
Hi,

I've got PG 8.2.3 running on a dual-core P4, and I noticed that, at least during reindexing, postgreSQL REINDEX process is using only 1 of those 2 cores.  You can clearly see this from this snippet from top:

Cpu0  : 93.3% us,  6.7% sy,  0.0% ni,  0.0% id,  0.0% wa,  0.0% hi,  0.0% si
Cpu1  :  0.0% us,  2.6% sy,  0.0% ni, 85.5% id, 11.8% wa,  0.0% hi,  0.0% si


  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND                                                                                                                                                      
21909 pg  25   0  116m  89m  42m R 98.9  9.2   1:01.92 postgres: pg mydb [local] REINDEX



This PG 8.2.3 was compiled from sources on this box, so if there is anything in the config/install process that should pick up that this box has "2" CPUs, perhaps that didn't happen?  I know I didn't manually instruct the config/install that the box is a dual-core box.  This is running on a Linux box with the SMP-aware kernel.

Is this a known limitation?  Am I reading this wrong?

Thanks,
Otis



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