On 03/08/2013 08:30 PM, Ahmad wrote: > @alex , you said that just add the "workers" in squid.conf ?? Yes, adding "workers 2" (or similar) to squid.conf will turn on SMP features. > how many workers do i need? It depends on many factors such as your hardware, core hyper-threading, offered load, disk caching needs, and other system needs (such as processing network interrupts). It is a complex question, and there is no formula that works for all cases. However, starting with 2 workers and making sure everything works is often a good idea. Keep in mind that not all Squid features are SMP-aware (the SmpScale wiki page attempts to document what workers can and cannot share): http://wiki.squid-cache.org/Features/SmpScale Once you got basic SMP working, using one worker for each otherwise idle CPU core (with cpu_affinity_map) is often (but not always) a good idea. > # Uncomment and adjust the following to add a disk cache directory. > cache_dir ufs /usr/local/squid/var/cache/squid 100 16 256 Ufs cache_dir is one of those SMP-unaware features. You cannot use a ufs cache_dir in SMP configuration without protecting it with SMP macros in squid.conf (and that trick will not allow workers to share the disk cache so it is only a hack that does not work well in many deployment enviroments). Consider using Rock store and/or shared memory caching instead if you can: http://wiki.squid-cache.org/Features/RockStore > what do i need to modify with it to get maximum cpu usage ?? Become a SETI node? :-) I assume you want to maximize Squid speed, not CPU usage. You can start with two workers and increase their number until Squid response time does not go down any more. Use cpu_affinity_map in squid.conf. Leave Cpu0 "for the OS". Be careful not to put two busy workers on sibling hyper-cores. This is just a sketch of an optimization algorithm. There are many details that depend on your setup. > @alex > also , i noted that u enclosed two files in > http://pastebin.com/dbXNEj5F > > what about the 2nd file ?? Sorry, I do not know what you mean or what those file are. I did not enclose anything on this thread IIRC. HTH, Alex.
