[OpenAFS-devel] good and bad performance of memory cache
Edward Moy
emoy@apple.com
Thu, 6 Feb 2003 18:27:51 -0800
On Thursday, February 6, 2003, at 03:09 PM, chas williams wrote:
> the default chunksize for memcache is too small. some results i posted
> earlier about tuning memcache:
>
>
> Version 1.02c ------Sequential Output------ --Sequential Input-
> --Random-
> -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
> Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP
> /sec %CP
>
> linux/memcache=18m
> 256M 3669 68 7695 33 1413 7 1566 24 1739 2 218.5
> 2
> linux/memcache=18m,chunksize=15
> 256M 3968 70 8966 32 2935 12 3381 50 4310 5 96.7
> 1
>
> solaris8/memcache=146m
> 256M 2415 41 3054 34 1546 13 1966 17 1895 8 155.0
> 6
> solaris8/memcache=146m,chunksize=15
> 256M 4666 56 6339 41 3457 20 4465 39 5447 15 87.3
> 5
A good suggestion. However, any value other than 13 that I make
-chucksize, cause a kernel panic. This is probably related to the
problem I had with setting the blocks to 100000.
------------------------------------------------------------------------
--
Edward Moy
Apple Computer, Inc.
emoy@apple.com
(This message is from me as a reader of this list, and not a statement
from Apple.)