-----Original Message-----
From: Alex Rousskov
Sent: Wednesday, February 06, 2013 11:01 PM
To: Scott Baker
Cc: squid-users@xxxxxxxxxxxxxxx
Subject: Re: cache_dir on /dev/shm?
On 02/06/2013 02:48 PM, Scott Baker wrote:
I want to store all my cache dir on a ram disk. I have this in my config:
cache_dir ufs /dev/shm/squid 1024 16 256
Is there any reason NOT to do this?
Yes, memory cache is generally faster than any cache_dir cache.
All the stuff in my cache is time
sensitive (expires after 15 minutes) so I'm not worried about losing
data, just worried about best practices.
If you do not need the cache to survive Squid crashes, use memory cache.
cache_mem 1024 MB
in my config. With ONLY this entry, everything results in a TCP_MISS.
I'm guessing the cache_mem isn't used the same way as a cache_dir?
You need to figure out why Squid does not want to use your memory cache.
This will help even if you later decide to use a cache_dir in addition
to the memory cache (for some valid reason).
I do not know of a simple way to answer that question (I always look at
cache.log with high debug levels), but I hope others on this list do. If
that way does not exist, we should add code to Squid to support such
answers.
Good luck,
Alex.
Better is to use cache_mem because this is the master cache used by all
squid instances when using SMP.
I have tested
1) With 5.000 users using 5GB tmpfs for each process ( 4 CPUs) 5GB by
CPU...
2) Dramatically increase cache_mem instead using cache_dir
30% faster for the second way....
