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Writing fast and efficiently - how ?

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Top Forums Programming Writing fast and efficiently - how ?
# 8  
Old 06-10-2002
I would look to the existing problem in a different way. The problem as stated intially is "formulating a faster technique for transfer of data from Shared Memory to a file" .
I would suggest to divide the shared memory into small segments and allow a pair of thread to read/write from each domain, in sync. Hence multiple threads operates on the data together but at mapped memory address. Each thread pointers should be intialized once to the domain bounday (addresses space). Once done a write thread of each process can write to a specific region incrementing a global resource each for itself. Meanwhile a read thread for each data division conditionally waits for the global variable to reach its max or upper domain limit. Once the event is initiated the write thread should conditionally wait for the variable to be initialized to the lower boud limit meanwhile the read thread should write the data to the file. Hence block I/O would be possible , which I think could be faster than the existing.
But however I do take an assumption that the order in which data has to writen to the file is immaterial.
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LEARN ABOUT DEBIAN

sub::exporter::globexporter

Sub::Exporter::GlobExporter(3pm)			User Contributed Perl Documentation			  Sub::Exporter::GlobExporter(3pm)

NAME

       Sub::Exporter::GlobExporter - export shared globs with Sub::Exporter collectors

VERSION

       version 0.002

SYNOPSIS

       First, you write something that exports globs:

	 package Shared::Symbol;

	 use Sub::Exporter;
	 use Sub::Exporter::GlobExport qw(glob_exporter);

	 use Sub::Exporter -setup => {
	   ...
	   collectors => { '$Symbol' => glob_exporter(Symbol => '_shared_globref') },
	 };

	 sub _shared_globref { return *Common }

       Now other code can import $Symbol and get their *Symbol made an alias to *Shared::Symbol::Symbol.

       If you don't know what this means or why you'd want to do it, you may want to stop reading now.

       The other class can do something like this:

	 use Shared::Symbol '$Symbol';

	 print $Symbol; # prints the scalar entry of *Shared::Symbol::Symbol

       ...or...

	 use Shared::Symbol '$Symbol' => { -as => 'SharedSymbol' };

	 print $SharedSymbol; # prints the scalar entry of *Shared::Symbol::Symbol

OVERVIEW

       Sub::Exporter::GlobExporter provides only one routine, "glob_exporter", which may be called either by its full name or may be imported on
       request.

	 my $exporter = glob_exporter( $default_name, $globref_locator );

       The routine returns a collection validator that will export a glob into the importing package.  It will export it under the name
       $default_name, unless an alternate name is given (as shown above).  The glob that is installed is specified by the $globref_locator, which
       can be either the globref itself, or a reference to a string which will be called on the exporter

       For an example, see the "SYNOPSIS", in which a method is defined to produce the globref to share.  This allows the glob-exporting package
       to be subclassed, for for the subclass to choose to re-use the same glob when exporting or to export a new one.

       If there are entries in the arguments to the globref-exporting collector other than those beginning with a dash, a hashref of them will be
       passed to the globref locator.  In other words, if we were to write this:

	 use Shared::Symbol '$Symbol' => { arg => 1, -as => 2 };

       It would result in a call like the following:

	 my $globref = Shared::Symbol->_shared_globref({ arg => 1 });

AUTHOR

       Ricardo Signes <rjbs@cpan.org>

COPYRIGHT AND LICENSE

       This software is copyright (c) 2010 by Ricardo Signes.

       This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

perl v5.10.1							    2010-11-23					  Sub::Exporter::GlobExporter(3pm)