Re: [log4perl-devel] apache worker, mod_perl2, appender/semaphore problem under medium load

[Mike S. <m...@pe...>]

On Fri, 20 Mar 2009, fo...@ne... wrote:

> - log4perl 1.10-1 (Ubuntu)

There's been a lot of changes to the Synchronized appender between
Log4perl 1.10 (released two years ago) and the current Log4perl 1.21 --
can you try the latest?

-- Mike

Mike Schilli
m...@pe...

>
> Configuration:
> Apache:
> 	PerlRequire /apache/startup.pl
> 	PerlWarn 	On
> 	PerlTaintCheck	On
>
> 	Alias /action/ /apache/action/
> 	<Location /action/>
> 	      SetHandler perl-script
> 	      PerlResponseHandler ModPerl::Registry
> 	      PerlOptions +ParseHeaders
> 	      Options +ExecCGI
> 	      Order allow,deny
> 	      Allow from all
> 	</Location>
>
>
> Log4Perl:
> 	...
> 	my $conf = qq(
> 		log4perl.category		= $threshold, Syncer
>
> 	# File appender (unsynchronized)
> 		log4perl.appender.Logfile		= Log::Log4perl::Appender::File
> 		log4perl.appender.Logfile.autoflush	= 1
> 		log4perl.appender.Logfile.filename	= $filename
> 		log4perl.appender.Logfile.mode		= append
> 		log4perl.appender.Logfile.layout	= Log::Log4perl::Layout::PatternLayout
> 		log4perl.appender.Logfile.layout.ConversionPattern = %d{dd/MMM/yyyy:HH:mm:ss} %p %m%n
>
> 		# Synchronizing appender, using the file appender above
> 		log4perl.appender.Syncer		= Log::Log4perl::Appender::Synchronized
> 		log4perl.appender.Syncer.appender	= Logfile
> 		log4perl.appender.Syncer.destroy	= 1
> 	);
>
> 	Log::Log4perl::init( \$conf );
> 	my $logger = Log::Log4perl::get_logger();
> 	...
>
>
> The threshold is set to INFO meaning that every call results in a single
> log entry being made. The script runs for about one second.
>
> When I tried out running the script as a handler (instead of the registry method), this did not
> change the behaviour.
>
> I understand that there are performance limits and eventually failures,
> but is not that a bit early, with only ten concurrent usersr?
>
> So I guess I have a misconfigured setup. Could anybody give me a good
> hint? I googled for my error, but without luck.
>
> Regs,
>
> Christian Folini
>
>
> --
> I myself am human and free only to the extent that I acknowledge the
> humanity and liberty of all my fellows...
> --- Mikhail Bakunin
>
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