Re: [APC-DEV] Caching file_get_contents output inside APC (Performance improvement).

hi, As caching everything obviously helps, I wonder if it makes sense to do it inside an opcode cache. What performence improvement does it bring vs: (pseudo code where my_cache* could be either APC user cache, memcached or other caching lib like Cache_Lite) if (!($cached = my_cache_get($key))) { $data = file_get_contents($path); my_cache_add($data, $ttl); } Cheers, -- Pierre On Mon, Oct 26, 2009 at 9:36 PM, Basant Kukreja <basant.kukreja@gmail.com> wrote: > Hi, >   APC creates a mmap which is used for caching compiled php response. Besides > this APC provides API to cache user data into this mmap. There are many php > apps which uses file_get_contents to read the static files. If APC can cache > these files in it's mmap, it will improve file_get_contents performance. > > Based on the above idea, I developed a patch which stores the file_get_contents > output in APC's cache. In this patch, APC intercepts the calls of > file_get_contents and replaces it with apc_file_get_contents function. If file > is a full path and entire file is requested then APC caches the content. > > To enable the caching use the following in php.ini : > apc.cache_static_contents=1 > apc.user_ttl = 30 > > apc.user_ttl will decide how long the entry will remain inside the cache.  If > apc.user_ttl is set to 0 then the entry will never be removed from cache. > > Here is the performance data collected using Studio 12 on Solaris sparc for > ecommerce php benchmark. (3500 simultaneous users) > > Excl.     Incl.     Excl.       Incl.       Excl.     Incl.      Name > User CPU  User CPU  Total LWP   Total LWP   Sys. CPU  Sys. CPU >    sec.      sec.        sec.        sec.      sec.      sec. > No Cache : >  0.831    28.660       1.141     540.018     0.030   344.311 > zif_file_get_contents > With Cache : >  1.481   181.537       1.821     282.758     0.140    12.449 > zif_apc_file_get_contents > > > User + System time before Caching = 372 seconds > User + System time after Caching = 193 seconds > Total time reduction in file_cache_contents = 48% > > Here is my blog : > > http://blogs.sun.com/basant/entry/caching_file_get_contents_output > Here is the link to the patch : > > http://blogs.sun.com/basant/resource/apc_file_cache_trunk_patch.txt > > There are many other enhancements possible in this patch. I would appreciate > any comments. > > Regards, > Basant. > > -- > APC Development Mailing List (http://pecl.php.net/APC) > To unsubscribe, visit: http://www.php.net/unsub.php > > -- Pierre http://blog.thepimp.net | http://www.libgd.org