From: Amos Jeffries <[email protected]>
> Actual experienced measurements from some general-purpose web caches. On
> 32-bit
> systems. Newer 64-bit systems have reported a 15MB/GB requirement.
> It's the amount of data seen to be used for index meta data and other types
> of
> index.
> ...
> The average average size of web traffic items here is around 64KB.
> ...
> Assuming what sized object?
> An (empty) web HTML 0.9 page has as few as 14 bytes. XML files likewise may
> only
> have 20 bytes or so.
> For a cache full of those (think dynamic web app gone downright evil), you
> would
> need about 1MB memory per MB of cache.
> Whereas at the other end, if you are caching only ISO DVD images. Your memory
> drops to under 1KB memory per GB of cache.
> Its a 'rule-of-thumb', which means we recommend to newbies that they use it
> to
> plan and configure their system memory. And over time watch their squid to
> see
> how it needs adjusting for best performance.
Hi,
replying to an old post...
We finaly bought our squid servers (540GB of disk, 48GB of RAM)... and I am a
bit scared...
I know it is just a rule of thumb but, if I re-apply the formula (for 64KB
average object sizes) and, having 16KB average object sizes, multiply the
required RAM by 4 (64/16), I get...
-------------------------+----------------+-------------
cache_dir (best) | RAM for DISK | cache_mem
-------------------------+----------------+-------------
613 GB ( 306 GB) | 36 GB | 1 GB
544 GB ( 272 GB) | 32 GB | 6 GB
476 GB ( 238 GB) | 28 GB | 11 GB
408 GB ( 204 GB) | 24 GB | 16 GB
340 GB ( 170 GB) | 20 GB | 21 GB
271 GB ( 135 GB) | 16 GB | 26 GB
203 GB ( 101 GB) | 12 GB | 31 GB
135 GB ( 67 GB) | 8 GB | 36 GB
66 GB ( 33 GB) | 4 GB | 41 GB
-------------------------+----------------+-------------
do these values look mostly correct?
Thx,
JD
