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Bug #57214 used memory in mmap mode creates confusion
Submitted: 2006-09-01 05:41 UTC Modified: 2007-02-18 02:19 UTC
From: thomas-lists at mysnip dot de Assigned:
Status: Closed Package: APC (PECL)
PHP Version: 4.4.3 OS: Linux
Private report: No CVE-ID: None
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From: thomas-lists at mysnip dot de
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 [2006-09-01 05:41 UTC] thomas-lists at mysnip dot de 
Description:
------------
http://news.php.net/php.pecl.dev/4094

I specified (coming from shm mode) to use
2 shm-segments of 30M size and was very confused to see
only 30M used in mmap mode.
Like Derick said in his post, one would expect that mmap
used 2 x 30M in that configuration, even if it would be 
one segment only.
One shouldn't loose half of the specified memory for apc when switching modes ;).

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 [2007-02-18 01:56 UTC] rasmus@php.net 
There is absolutely no point in using multiple mmap segments.  The only fix here would be to throw a warning.
 [2007-02-18 02:04 UTC] shire@php.net 
Does it make more sense to trow an error or to assume the user wants (apc.shm_segments * apc.shm_size) as suggested?  I would lean towards error just so it's clear.
 [2007-02-18 02:19 UTC] rasmus@php.net 
There is now a startup warning if a value other than 1 is seen for this shm_segments in MMAP mode.
 
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