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POAPC File Cache not working but user cache is fine
 

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  1. POAPC File Cache not working but user cache is fine
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    <p><strong>Summary:</strong> I have PHP(5.3.8) installed as an Apache Module, and installed APC via PECL. The User cache is working fine but the File Cache is not working ( I do have apc.cache_by_default set to 1 so that's not the issue)</p> <p><strong>Detail:</strong> I have just got a VPS (with cPanel/WHM) to test what gains i could get in my application with using apc file cache AND user cache. </p> <p>So I got the PHP 5.3 compiled in as a DSO (apache module).</p> <p>Then installed APC via PECL through SSH. (First I tried with WHM Module installer, it also had the same problem, so I tried it via ssh)</p> <p>All seemed fine and phpinfo showed apc loaded and enabled.</p> <p>Then I checked with apc.php. All seemed OK</p> <p>But as I started testing my php application, the stats in apc for File Cache Information state:</p> <pre><code>Cached Files 0 ( 0.0 Bytes) Hits 1 Misses 0 Request Rate (hits, misses) 0.00 cache requests/second Hit Rate 0.00 cache requests/second Miss Rate 0.00 cache requests/second Insert Rate 0.00 cache requests/second Cache full count 0 </code></pre> <p>Which meant no PHP files were being cached, even though I had browsed through over 10 PHP files having multiple includes. So there must have been some Cached Files.</p> <p>But the user cache is functioning fine. </p> <pre><code>User Cache Information Cached Variables 0 ( 0.0 Bytes) Hits 1000 Misses 1000 Request Rate (hits, misses) 0.84 cache requests/second Hit Rate 0.42 cache requests/second Miss Rate 0.42 cache requests/second Insert Rate 0.84 cache requests/second Cache full count 0 </code></pre> <p>The above user cache output is from an APC caching test script which tries to retrieve and store 1000 entries and gives me the times. A sort of simple benchmark.</p> <p>Can anyone help me here.<br> Even though apc.cache_by_default = 1, no php files are being cached.</p> <p>This is <strong>my apc config</strong> </p> <pre><code>Runtime Settings apc.cache_by_default 1 apc.canonicalize 1 apc.coredump_unmap 0 apc.enable_cli 0 apc.enabled 1 apc.file_md5 0 apc.file_update_protection 2 apc.filters apc.gc_ttl 3600 apc.include_once_override 0 apc.lazy_classes 0 apc.lazy_functions 0 apc.max_file_size 1M apc.mmap_file_mask apc.num_files_hint 1000 apc.preload_path apc.report_autofilter 0 apc.rfc1867 0 apc.rfc1867_freq 0 apc.rfc1867_name APC_UPLOAD_PROGRESS apc.rfc1867_prefix upload_ apc.rfc1867_ttl 3600 apc.serializer default apc.shm_segments 1 apc.shm_size 32M apc.slam_defense 1 apc.stat 1 apc.stat_ctime 0 apc.ttl 0 apc.use_request_time 1 apc.user_entries_hint 4096 apc.user_ttl 0 apc.write_lock 1 </code></pre> <p>Also most php files are under 20KB, thus, apc.max_file_size = 1M is not the cause.</p> <p>I've tried following things with no luck.</p> <ol> <li>Using 'apc_compile_file ' to force some files into opcode cache with no luck. </li> <li>re-installed APC with Debugging enabled, but nothing shows in the error_log </li> <li>setting mmap_file_mask to /dev/zero and /tmp/apc.xxxxxx, i have also set /tmp permissions to 777 to no avail </li> <li>set apc.enable_cli = 1 AND run a script from cli </li> <li>Set apc.max_file_size = 5M (just in case) </li> <li>switched php handler from dso to FastCGI in WHM (then switched it back to dso as it did not solve the problem) </li> <li>Even tried restarting the container </li> </ol> <p>Any clue anyone.</p> <p><strong>Note:</strong> I had posted the question on serverfault.com but did not get much views or an answer so I'm posting here (as stackoverflow seems to be more active and I have only got 1 month to test my VPS and see if it is of any use over shared)</p>
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