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Asked: 2026-05-10T16:59:58+00:00

I decided to install APC to speed up the site that I work for.

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I decided to install APC to speed up the site that I work for. Sadly, I found out that it was already installed and enabled(The developer who first worked on the servers has moved on).

Then I decided to check the usage of it to see if it needs more memory allocated to it or not. This is when I discovered something weird. A simple file with this code:

<?php     print_r(apc_cache_info()); ?>

It would not work when served from apache. I get Error 320 (net::ERR_INVALID_RESPONSE): Unknown error. And there is nothing in the error log. From the cli on the server, it works fine. But it only says that my check_apc.php file is cached(name of the script that I was running).

So it looks like APC has not fully/correctly been set up. Any one know what the problem could be?

Contents of /etc/php.d/apc.ini:

; Enable apc extension module extension = apc.so ; Options for the apc module apc.enabled=1 apc.shm_segments=1 apc.optimization=0 apc.shm_size=32 apc.ttl=7200 apc.user_ttl=7200 apc.num_files_hint=1024 apc.mmap_file_mask=/tmp/apc.XXXXXX apc.enable_cli=1 apc.cache_by_default=1

The server is running CentOS

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1 Answer

  1. Has anyone upgraded the version of php on the server since apc.so was created? It may be that apc.so was compiled against a different version of php.

    If possible, try re-compiling apc.so against the current version of php. Or if you are using a package manager, try removing the apc package entirely and reinstall it.

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