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From "Al Pacifico" <pacif...@drizzle.com>
Subject RE: [OT] Server error log says "Accept mutex: sysvsem"
Date Wed, 06 Feb 2002 14:34:29 GMT
Ged-
You are correct; a little more delving suggests that it has to do with
Apache, but not mod_perl. The message appears only when the server is
started.

Apache was compiled from the mod_perl source tree using only the
following options:
	APACHE_SRC=../usr/apache...
	APACHE_PREFIX=/usr/local/apache
	EVERYTHING=1
	DO_HTTPD=1
	USE_APACI=1

httpd -l produces the following output:
Compiled-in modules:
  http_core.c
  mod_env.c
  mod_log_config.c
  mod_mime.c
  mod_negotiation.c
  mod_status.c
  mod_include.c
  mod_autoindex.c
  mod_dir.c
  mod_cgi.c
  mod_asis.c
  mod_imap.c
  mod_actions.c
  mod_userdir.c
  mod_alias.c
  mod_access.c
  mod_auth.c
  mod_setenvif.c
  mod_perl.c
suexec: disabled; invalid wrapper /usr/local/apache/bin/suexec

A Google groups search on 'accept mutex' yields plenty of posts
reporting this message, but most of them involve apache not starting and
other configuration/permissions errors.

The changes file (since 1.3.22) mentions the following:

  *) Addition of the AcceptMutex runtime directive. The accept mutex
     method is now runtime controllable. The suite of available methods
     per platform is defined at compile time (with
HAVE_FOO_SERIALIZED_ACCEPT
     noting that the method is available and works, and
     USE_FOO_SERIALIZED_ACCEPT noting that it should be the default
     method in absense of any AcceptMutex line, or via AcceptMutex
default)
     and selectable at runtime. The full (current) suite is uslock,
     pthread, sysvsem, fcntl, flock, os2sem, tpfcore and none, but
     not all platforms accept all methods. [Jim Jagielski]

However, the sample configuration file supplied with Apache contains no
AcceptMutex runtime directive nor did I come across documentation
suggesting how it should be used or where I would learn the options for
my system (linux, i686, kernel 2.4.7-10).

Any apache gurus on this list?

-al
Al Pacifico
Seattle, WA

-----Original Message-----
From: Ged Haywood [mailto:ged@www2.jubileegroup.co.uk] 
Sent: Wednesday, February 06, 2002 4:55 AM
To: Rafiq Ismail (ADMIN)
Cc: Al Pacifico; modperl@apache.org
Subject: Re: [OT] Server error log says "Accept mutex: sysvsem"

Hi there,

On Wed, 6 Feb 2002, Rafiq Ismail (ADMIN) wrote:

> > The following message keeps appearing in my server error log
> guess would be that it's harmless.

Nothing to do with mod_perl, check the Apache docs (performance tuning
guide).
Presumably this only happens when you restart the server?

73,
Ged.




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