title: Wincache extension has no impact on IIS 7.5
body: <p>On my IIS 7.5 webserver I am running PHP 5.6 together with the wincache extension (1.3.6.1) for caching the opcode of my PHP scripts. This is supposed to reduce CPU load on the server, because the PHP scripts don't have to be recompiled every time a request comes in.</p>
  
  <p>However I don't see the CPU load decreasing noticably. With 3 clients my web service is practically maxed out (80% cpu utilization on average) and that's just as much as without wincache.</p>
  
  <p>Here's the relevant section from <code>php.ini</code></p>
  
  <pre><code>[PHP_WINCACHE]
  extension=php_wincache.dll
  ; Full reference: http://php.net/manual/en/wincache.configuration.php
  wincache.fcenabled = 0
  wincache.ocenabled = 1
  wincache.ucenabled = 0
  wincache.fcachesize = 64
  wincache.fcndetect = 0
  wincache.maxfilesize = 256
  wincache.chkinterval = 10
  wincache.enablecli = 0
  </code></pre>
  
  <p>I had to disable file caching, because of this: <a href="https://serverfault.com/questions/643458/failure-in-php-minit-functionwincache-with-wordpress-microsoft-azure-and-iis">https://serverfault.com/questions/643458/failure-in-php-minit-functionwincache-with-wordpress-microsoft-azure-and-iis</a></p>
  
  <p><code>print_r(wincache_ocache_fileinfo())</code> prints this:</p>
  
  <pre><code>Array
  (
      [total_cache_uptime] =&gt; 303
      [is_local_cache] =&gt; 1
      [total_file_count] =&gt; 42
      [total_hit_count] =&gt; 32160
      [total_miss_count] =&gt; 42
      [file_entries] =&gt; Array
      ... (skipped precise file info for brevity)
  </code></pre>
  
  <p>And <code>print_r(wincache_ocache_meminfo())</code> gives me this:</p>
  
  <pre><code>Array
  (
      [memory_total] =&gt; 100663296
      [memory_free] =&gt; 99769616
      [num_used_blks] =&gt; 1677
      [num_free_blks] =&gt; 1
      [memory_overhead] =&gt; 26880
  )
  </code></pre>
  
  <p>Any suggestions on why I don't see wincache having any impact? What else can I try to reduce CPU load on my webserver?</p>