Efficient logging of time measurements


 
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Old 03-10-2013
Instead of pipes -- if you're worried about resources or blocking, simply use a single thread that reads a message queue. Once a message queue (SYSV or POSIX) is set up there is a single syscall ( e.g., msgsnd, no blocking ) that is mt-safe and a mutex is not required.

The buffersize, unlike, a pipe, can be any size. The message queue buffer is kernel persistent, so if the entire set of threads/processes using the message queue die, the data is still available. Pipes are closed on process termination.
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Agent::Driver::Syslog(3pm)				User Contributed Perl Documentation				Agent::Driver::Syslog(3pm)

NAME
Log::Agent::Driver::Syslog - syslog logging driver for Log::Agent SYNOPSIS
use Log::Agent; require Log::Agent::Driver::Syslog; my $driver = Log::Agent::Driver::Syslog->make( -prefix => prefix, -facility => "user", -showpid => 1, -socktype => "unix", -logopt => "ndelay", ); logconfig(-driver => $driver); DESCRIPTION
The syslog logging driver delegates logxxx() operations to syslog() via the Sys::Syslog(3) interface. The creation routine make() takes the following switches: "-facility" => facility Tell syslog() which facility to use (e.g. "user", "auth", "daemon"). Unlike the Sys::Syslog(3) interface, the facility is set once and for all: every logging message will use the same facility. If you wish to log something to "auth" for instance, then do so via Sys::Syslog directly: there is no guarantee that the application will configure its Log::Agent to use syslog anyway! "-logopt" => syslog options Specifies logging options, under the form of a string containing zero or more of the words ndelay, cons or nowait. "-prefix" => prefix The prefix here is syslog's identification string. "-showpid" => flag Set to true to have the PID of the process logged. It is false by default. "-socktype" => (unix | inet) Specifies the logging socket type to use. The default behaviour is to use Sys:Syslog's default. CHANNELS
All the channels go to syslog(), of course. AUTHOR
Raphael Manfredi <Raphael_Manfredi@pobox.com> SEE ALSO
Log::Agent::Driver(3), Log::Agent::Channel::Syslog(3). perl v5.10.0 2002-03-09 Agent::Driver::Syslog(3pm)