| Cache Replacement Policy | Heap LFUDA |
| Low-Water Mark in % | 90 |
| High-Water Mark in % | 95 |
| Do Not Cache | steampowered.com steamcommunity.com steamgames.com steamusercontent.com steamcontent.com steamstatic.com |
| Enable Offline Mode | Not checked |
| External Cache Managers |
| Hard Disk Cache Size | 50000 |
| Hard Disk Cache System | aufs |
| Level 1 Directories | 64 |
| Hard Disk Cache Location | /var/squid/cache |
| Minimum Object Size | 0 |
| Maximum Object Size | 1024 |
| Memory Cache Size | 3072 |
| Maximum Object Size in RAM | 1024 |
| Memory Replacement Policy | Heap GDSF |
| Memory Replacement Policy | Checked |
| Custom refresh_patterns | # 1 year = 525600 mins, 1 month = 43800 mins, 1 week = 10080 min, 1 day = 1440 min #Optional: dont cache wordpress admin panel refresh_pattern (wp-admin) 0 0% 0 # All Files. refresh_pattern -i \.(3gp|7z|ace|asx|avi|bin|inc|cab|dat|qt|deb|rpm|divx|dvr-ms)(\?|$) 43800 100% 129600 ignore-no-cache ignore-no-store ignore-private override-expire override-lastmod reload-into-ims ignore-reload refresh_pattern -i \.(rar|jar|gz|tgz|tar|bz2|iso|arj|lha|lzh|iop|nzp|pak|mar)(\?|$) 43800 100% 129600 ignore-no-cache ignore-no-store ignore-private override-expire override-lastmod reload-into-ims ignore-reload refresh_pattern -i \.(m1v|m2(v|p)|mo(d|v)|(x-|)flv)(\?|$) 43800 100% 129600 ignore-no-cache ignore-no-store ignore-private override-expire override-lastmod reload-into-ims ignore-reload refresh_pattern -i \.(jp(e?g|e|2)|gif|pn[pg]|bm?|tiff?|ico|swf)(\?|$) 43800 100% 129600 ignore-no-cache ignore-no-store ignore-private override-expire override-lastmod reload-into-ims ignore-reload refresh_pattern -i \.(mp(e?g|a|e|1|2|3|4)|mk(a|v)|ms(i|u|p))(\?|$) 43800 100% 129600 ignore-no-cache ignore-no-store ignore-private override-expire override-lastmod reload-into-ims ignore-reload refresh_pattern -i \.(og(x|v|a|g)|rar|rm|r(a|p)m|snd|vob|wav|ac4)(\?|$) 43800 100% 129600 ignore-no-cache ignore-no-store ignore-private override-expire override-lastmod reload-into-ims ignore-reload refresh_pattern -i \.(pp(s|t)(x?)|wax|wm(a|v)|wmx|wpl|zip|cb(r|z|t))(\?|$) 43800 100% 129600 ignore-no-cache ignore-no-store ignore-private override-expire override-lastmod reload-into-ims ignore-reload refresh_pattern -i \.(woff|txt|exe|dll|dmg|webm)(\?|$) 43800 100% 129600 ignore-no-cache ignore-no-store ignore-private override-expire override-lastmod reload-into-ims ignore-reload refresh_pattern -i \.(pdf|rtf|xls(x?)|doc(x?))(\?|$) 43800 100% 129600 ignore-no-cache ignore-no-store ignore-private override-expire override-lastmod reload-into-ims ignore-reload refresh_pattern -i \.(css)(\?|$) 10080 60% 43800 ignore-no-cache ignore-no-store ignore-private override-expire override-lastmod reload-into-ims ignore-reload refresh_pattern -i \.(js)(\?|$) 10080 60% 10080 ignore-no-cache ignore-no-store ignore-private override-expire override-lastmod reload-into-ims ignore-reload refresh_pattern -i \.(html|htm)(\?|$) 1440 60% 10080 ignore-no-cache ignore-no-store ignore-private override-expire reload-into-ims #refresh_pattern -i \.(doc|pdf)(\?|$) 10080 90% 43200 ignore-no-cache ignore-no-store ignore-private override-expire reload-into-ims refresh_pattern -i \.(cdn) 10800 100% 43800 override-expire override-lastmod reload-into-ims ignore-reload ignore-no-cache ignore-private refresh_pattern -i (cdn) 10800 100% 43800 override-expire override-lastmod reload-into-ims ignore-reload ignore-no-cache ignore-private refresh_pattern \.ytimg\? 10800 90% 10800 override-expire ignore-reload ignore-no-cache refresh_pattern ^http://*.facebook.com/* 720 100% 4320 refresh_pattern ^http://*.yahoo.*/.* 720 100% 4320 refresh_pattern ^http://*.yimg.*/.* 720 100% 4320 refresh_pattern ^http://*.gmail.*/.* 720 100% 4320 refresh_pattern ^http://*.google.*/.* 720 100% 4320 refresh_pattern ^http://*.googlesyndication.*/.* 720 100% 4320 refresh_pattern ^http://*.apple.*/.* 720 100% 4320 refresh_pattern ^ftp: 1440 20% 10080 refresh_pattern ^gopher: 1440 0% 1440 # Dynamic Content. refresh_pattern -i (/cgi-bin/|\?) 0 0% 0 # Catch all. #refresh_pattern . 360 90% 1440 override-lastmod reload-into-ims refresh_pattern . 0 20% 4320 |
This is one of the top two options as far as performance impact goes.
The default value here is 8 MB, which is a safe option for just about any system size.
But since your box is not lacking in memory it can safely be raised to 32 MB, and even 48 if you have stripped all other services off of your server.
If your box is lacking in memory, go back to the hardware section and reread the part about memory…you need a bunch of memory for a fast web cache.
You should be aware that cache_mem does not limit the process size of squid. This sets how much memory squid is allowed to set aside for “hot objects” which are the most recently used objects.
Having said all that, keep in mind that the buffer cache in Linux is also quite good, so the gains you'll see by raising this are very small, but still measurable.
This is where you set the directories you will be using.
You should have already mkreiserfs'd your cache directory partitions, so you'll have an easy time deciding the values here.
First, you will want to use about 80% or less of each cache directory for the web cache.
If you use any more than that you will begin to see a slight degradation in performance.
Remember that cache size is not as important as cache speed, since for maximum effectiveness your cache needs only store about a weeks worth of traffic.
You'll also need to define the number of directories and sub-directories. The formula for deciding that is this:
x=Size of cache dir in KB (i.e. 6GB=~6,000,000KB) y=Average object size (just use 13KB) z=Number of directories per first level directory (((x / y) / 256) / 256) * 2 = # of directories As an example, if 6GB of the drives is used, so: 6,000,000 / 13 = 461538.5 / 256 = 1802.9 / 256 = 7 * 2 = 14 So my cache_dir line would look like this: cache_dir 6000 14 256