APC caching different files with same names in different directories as same file
<p>I'm having trouble with my APC config. It seems like APC caches files with the same name, in different directories, as if they were the same file. </p>

<p>The directory structure is as follows:</p>

<pre><code>src/
  development/
  edge/
  stable/
    tag-20101101/
    tag-20101115/
    ...
</code></pre>

<p>The code resides in development, edge and in each of the tag directories. What seems to happen is that when APC caches for example src/stable/foo/bar/quux.php, it uses the same cache for src/development/foo/bar/quux.php, even though they're not the same file. Some files may be included using a relative path, though I have not yet determined if there is any connection between files included relatively, and the APC caching problems.</p>

<p>My APC config (as reported by apc.php) is as follows:</p>

<pre><code>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             5M
apc.mmap_file_mask            /tmp/apc.tKRzKb
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.shm_segments              1
apc.shm_size                  128
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>I am using PHP 5.3.2, and APC 3.1.3p1, with PHP-FPM. The server is a virtualized RHEL 5.4 with 4GB of allocated RAM, running on another RHEL 5.4 server with 32 GB RAM and 12 AMD Opteron 2.4 GHz CPU cores.</p>

<p>Does anyone have any idea what could cause this, or anything I might do to fix it?</p>
