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Re: High load average in 64-core server , no I/O wait and CPU is idle

From: Stephen Frost <sfrost(at)snowman(dot)net>
To: "Rajesh Kumar(dot) Mallah" <mallah(at)tradeindia(dot)com>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: High load average in 64-core server , no I/O wait and CPU is idle
Date: 2012-05-24 15:57:37
Message-ID: 20120524155737.GP1267@tamriel.snowman.net (view raw or flat)
Thread:
Lists: pgsql-performance
Rajesh,

* Rajesh Kumar. Mallah (mallah(at)tradeindia(dot)com) wrote:
> We are  puzzled why the CPU and DISK I/O system are not being utilized 
> fully and would seek lists' wisdom on that.

What OS is this?  What kernel version?

> just a thought, will it be a good idea to partition the host hardware 
> to 4 equal  virtual environments , ie 1 for master (r/w) and 3 slaves r/o
> and distribute the r/o load on the 3 slaves ?

Actually, it might help with 9.1, if you're really running into some
scalability issues in our locking area..  You might review this:

http://rhaas.blogspot.com/2012/04/did-i-say-32-cores-how-about-64.html

That's a pretty contrived test case, but I suppose it's possible your
case is actually close enough to be getting affected also..

	Thanks,

		Stephen

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Subject: Re: High load average in 64-core server , no I/O wait and CPU is idle
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