Coda File System

Re: private mapping a server

From: Jan Harkes <jaharkes_at_cs.cmu.edu>
Date: Wed, 22 Dec 1999 14:19:17 -0500


On Wed, Dec 22, 1999 at 10:47:46AM -0800, Phil Nelson wrote:
> I just thought some of you might be interested in the difference
> in server startup between anonymous mapping and private mapping.

Ok, I'll summarize, as probably everyone will try to duplicate this calculation at the moment

anonymous RVM data mapping


> 10:07:23 Setting Rvm Truncate threshhold to 5.
> 10:09:41 Partition /vicepa: 5346725K available (minfree=5%), 5312484K free.
> 10:09:54 File Server started Wed Dec 22 10:09:54 1999
RVM loading		 	02:18
Checking and attaching volumes	00:13
				-----
				02:31 total time

private RVM data mapping


> 10:14:12 Setting Rvm Truncate threshhold to 5.
> 10:14:12 Partition /vicepa: 5346725K available (minfree=5%), 5312484K free.
> 10:14:20 File Server started Wed Dec 22 10:14:20 1999
RVM loading			00:00
Checking and attaching volumes	00:08
				-----
				00:08 total time

I guess that in the anonymous case the additional memory pressure causes more paging and swapping, which accounts for the longer `checking and attaching' time.

Impressive, I'm temped to measure the difference on viotti, one of our servers, but it uses a partition for RVM data, and Linux won't mmap raw disks.

Jan Received on 1999-12-22 14:24:19