Solved

apc.shm_segments setting ignored in MMAP mode

Posted on 2011-02-22
6
2,071 Views
Last Modified: 2013-12-13
Hi there:

This is an error message I am getting in my apache log file:

PHP Warning:  PHP Startup: apc.shm_segments setting ignored in MMAP mode in Unknown on line 0

I have my php.ini file APC as follows:

extension=apc.so
[apc]
apc.ttl="7200"
apc.user_ttl="7200"
apc.shm_segments="3"
apc.shm_size="32"

May that be related to an error in my config file?

Thank you very much in advance.

Javier Faus
0
Comment
Question by:javierfaus
  • 3
  • 3
6 Comments
 
LVL 14

Accepted Solution

by:
svgmuc earned 125 total points
ID: 35006154
From http://php.net/manual/en/apc.configuration.php

When APC is compiled with mmap support (Memory Mapping), it will use only one memory segment, unlike when APC is built with SHM (SysV Shared Memory) support that uses multiple memory segments. MMAP does not have a maximum limit like SHM does in /proc/sys/kernel/shmmax. In general MMAP support is recommeded because it will reclaim the memory faster when the webserver is restarted and all in all reduces memory allocation impact at startup.
0
 

Author Comment

by:javierfaus
ID: 35011103
So if my APC is working in MMAP mode I just set the apc.shm_segments="1", is it?

Thanks in advance.
Javier.
0
 
LVL 14

Expert Comment

by:svgmuc
ID: 35011370
Yes, that's the only acceptable setting.
0
Backup Your Microsoft Windows Server®

Backup all your Microsoft Windows Server – on-premises, in remote locations, in private and hybrid clouds. Your entire Windows Server will be backed up in one easy step with patented, block-level disk imaging. We achieve RTOs (recovery time objectives) as low as 15 seconds.

 

Author Comment

by:javierfaus
ID: 35023305
Hi svgmuc:

Thanks for your help here. Is there any way to make sure my APC is actually configured to use MMAP? I would say it is because of the error message but still not 100% sure.

Thanks a lot for your support in this one.
Javier.
0
 

Author Closing Comment

by:javierfaus
ID: 35205380
Just partial answer.
0
 
LVL 14

Expert Comment

by:svgmuc
ID: 35206334
The error would not show if not in MMAP mode.
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

If you've heard about htaccess and it sounds like it does what you want, but you're not sure how it works... well, you're in the right place. Read on. Some Basics #1. It's a file and its filename is .htaccess (yes, with a dot in the front). #…
Since pre-biblical times, humans have sought ways to keep secrets, and share the secrets selectively.  This article explores the ways PHP can be used to hide and encrypt information.
Learn how to match and substitute tagged data using PHP regular expressions. Demonstrated on Windows 7, but also applies to other operating systems. Demonstrated technique applies to PHP (all versions) and Firefox, but very similar techniques will w…
The viewer will learn how to look for a specific file type in a local or remote server directory using PHP.

930 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

14 Experts available now in Live!

Get 1:1 Help Now