Re: Joel's Performance Issues WAS : Opteron vs Xeon

From: Jim C. Nasby
Subject: Re: Joel's Performance Issues WAS : Opteron vs Xeon
Date: ,
Msg-id: 20050423020151.GW58835@decibel.org
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In response to: Re: Joel's Performance Issues WAS : Opteron vs Xeon  ("Joel Fradkin")
Responses: Re: Joel's Performance Issues WAS : Opteron vs Xeon  (Kevin Brown)
List: pgsql-performance

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Re: Opteron vs Xeon (Was: What to do with 6 disks?)  ("Anjan Dave", )
 Re: Opteron vs Xeon (Was: What to do with 6 disks?)  ("Joel Fradkin", )
  Re: Joel's Performance Issues WAS : Opteron vs Xeon  (Josh Berkus, )
   Re: Joel's Performance Issues WAS : Opteron vs Xeon  ("Joel Fradkin", )
    Re: Joel's Performance Issues WAS : Opteron vs Xeon  (Josh Berkus, )
     Re: Joel's Performance Issues WAS : Opteron vs Xeon  (Vivek Khera, )
    Re: Joel's Performance Issues WAS : Opteron vs Xeon  (John A Meinel, )
     Re: Joel's Performance Issues WAS : Opteron vs Xeon  ("Joel Fradkin", )
      Re: Joel's Performance Issues WAS : Opteron vs Xeon  (John A Meinel, )
       Re: Joel's Performance Issues WAS : Opteron vs Xeon  (Tom Lane, )
        Re: Joel's Performance Issues WAS : Opteron vs Xeon  ("Joel Fradkin", )
       Re: Joel's Performance Issues WAS : Opteron vs Xeon  ("Joel Fradkin", )
        Re: Joel's Performance Issues WAS : Opteron vs Xeon  ("Jim C. Nasby", )
         Re: Joel's Performance Issues WAS : Opteron vs Xeon  (Kevin Brown, )
          Re: Joel's Performance Issues WAS : Opteron vs Xeon  (Josh Berkus, )
           Re: Joel's Performance Issues WAS : Opteron vs Xeon  (Kevin Brown, )
            Re: Joel's Performance Issues WAS : Opteron vs Xeon  ("Jim C. Nasby", )
      Re: Joel's Performance Issues WAS : Opteron vs Xeon  (Josh Berkus, )
      Re: Joel's Performance Issues WAS : Opteron vs Xeon  (Andreas Pflug, )

Hrm... I was about to suggest that for timing just the query (and not
output/data transfer time) using explain analyze, but then I remembered
that explain analyze can incur some non-trivial overhead with the timing
calls. Is there a way to run the query but have psql ignore the output?
If so, you could use \timing.

In any case, it's not valid to use pgadmin to time things.
--
Jim C. Nasby, Database Consultant               
Give your computer some brain candy! www.distributed.net Team #1828

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From: Kevin Brown
Date:
Subject: Re: Joel's Performance Issues WAS : Opteron vs Xeon
From: Greg Stark
Date:
Subject: Re: Bad n_distinct estimation; hacks suggested?