Application not working in multi core platform Post: 302911797

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Operating Systems Solaris Application not working in multi core platform Post 302911797 by Don Cragun on Sunday 3rd of August 2014 08:11:53 AM

08-03-2014

Registered User

You say you have a multi-process application and you say you are using the POSIX threads library. These are two very different things, but you have the same issue either way. You have multiple threads (or processes) updating data that has not been properly protected against simultaneous access. If you have a multi-process application, the shared data could be in a file or could be in a shared memory segment. If you have a multi-threaded single process application, the shared data could be in a file, a shared memory segment, or any non-thread-local storage in the process. It could be caused by using an api like read() into a global buffer. It could caused by a statement like a++; for some variable shared by more than one thread/process. It could be thousands of other things in you millions of LOC.

If you can figure out what data is being screwed up on a multi-processor system, start by looking at everything that references that data.

Good luck...

Don Cragun

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multi

fileutil::multi(n)						  file utilities						fileutil::multi(n)

__________________________________________________________________________________________________________________________________________________

NAME

       fileutil::multi - Multi-file operation, scatter/gather, standard object

SYNOPSIS

       package require Tcl  8.4

       package require fileutil::multi	?0.1?

       package require fileutil::multi::op  ?0.1?

       package require wip  ?1.0?

       ::fileutil::multi ?word...?

_________________________________________________________________

DESCRIPTION

       This  package provides a single command to perform actions on multiple files selected by glob patterns. It is a thin layer over the package
       fileutil::multi::op which provides objects for the same. This package simply creates a single such object and directs all file commands	to
       it.

       At the core is a domain specific language allowing the easy specification of multi-file copy and/or move and/or deletion operations. Alter-
       nate names would be scatter/gather processor, or maybe even assembler.  For the detailed specification  of  this  language,  and  examples,
       please see the documention for the package fileutil::multi::op.

PUBLIC API

       The main command of the package is:

       ::fileutil::multi ?word...?
	      This command interprets the specified words as file commands to execute. See the section FILE API of the documentation for the pack-
	      age fileutil::multi::op for the set of acceptable commands, their syntax, and semantics.

	      The result of the command is the result generated by the last file command it executed.

BUGS, IDEAS, FEEDBACK
       This document, and the package it describes, will undoubtedly contain bugs and other problems.  Please report such in the category fileutil
       of the Tcllib SF Trackers [http://sourceforge.net/tracker/?group_id=12883].  Please also report any ideas for enhancements you may have for
       either package and/or documentation.

KEYWORDS

       copy, file utilities, move, multi-file, remove

CATEGORY

       Programming tools

fileutil								0.1							fileutil::multi(n)