Re: Performance tuning

Jens-S. Voeckler wrote:
>
> On Sun, 21 Nov 1999, Henrik Nordstrom wrote:
>
> ]> - number of L1 and L2 directories for on-disk cache?
> ]
> ]L2 = 256
> ]L1 at least cache_dir_size * 2 / store_avg_object_size / L2 / L2 + 1
>
> Could you please set a few parenthesis for people like me?

Normal rules apply. Calculated straight left to right.

> cache_dir_size * 2 := 134217728 [Byte]
> store_avg_object_size := 13312 [Byte]
> L2 := 256
>
> L1 = 1.1538 ???

Yes, or actually 1 since only integers are allowed. The +1 is to guard
the calculation from any rouning/truncation error (will be enought
irregardless if the result is rounded or truncated).

Put another way:

Squid will use one L1 directory for each 416 MB of cache_dir space with
the default store_avg_object_size setting of 13 KB. More L1 directories
will only waste inodes, less will create an inbalance in how the L1
directories are populated by Squid.

--
Henrik Nordstrom
Squid hacker