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Parallel :: ForkManager is a simple branch manager for parallel processing VERSION version 2.02 SYNTAX Using Parallel :: ForkManager; my $ pm = Parallel :: ForkManager-> new ($ MAX_PROCESSES); DATA CYCLE: foreach my $ data (@all_data) # Returns and returns pid to the child: my $ pid = $ pm-> start and next DATA_LOOP; ... work with $ data in a child process ... $ pm-> finish; # Terminate the child process This module is intended to be used in operations that may run in parallel where the number of fork processes must be limited. A typical application is a downloader that will extract hundreds thousands of files. The boot loader code will look something like this: use LWP :: Simple; use Parallel :: ForkManager; ... my @links = ( http:,rulez_data.txt, http:nowy.hostmore_data.doc,more_data.doc, ... ); ... # Up to 30 processes for parallel download my $ pm = Parallel :: ForkManager-> new (30); CUFFLINKS: foreach my $ linkarray (@links) $ pm-> start and next REFERENCES; # make a fork my ($ link, $ fn) = @ $ linkarray; warning Unable to get $ fn from $ link if getstore ($ link, $ fn)! = RC_OK; $ pm-> finish; # quits the child process $ pm-> wait_all_children; First you need to instantiate a ForkManager using the new constructor. Specify the maximum number of processes to be created. If you enter 0, there will be no fork; this is good for debugging purposes. Then use $ pm-> start to fork. $ pm returns 0 for child process and child pid for parent process (see also fork () in perlfunc (1p)). On and on skips the inner loop in the parent process. NOTE: $ pm-> start dies if the fork fails. $ pm-> finish terminates the child process (assuming the fork was done initially). NOTE. You cannot use $ pm-> start if you are already in a child process. If you want to manage a different set of subprocesses in a child process, you must create another Parallel :: ForkManager object! METHODS The comment letter indicates where to execute the method. P for parents, C for child. new $ processes Create a new Parallel :: ForkManager object. Specify the maximum number of secondary parts for the site. If you specify 0 (zero) the children will not be branched. This is for debugging purposes. The second optional $ tempdir parameter is only used when you want child elements to return a reference to some data (see GETTING DATA STRUCTURES below). If not specified, it is set by calling File :: Temp :: tempdir (). The new method will die if the temporary directory does not exist or the directory does not exist. As of version 2.00, the constructor can also be called in the usual Moo Moose style. these. my $ fm = Parallel :: ForkManager-> new ( max_prox => 4, temporary directory => ..., child_role => Parallel :: ForkManager :: CustomChild, );child_role Returns the name of the role used by the ForkManager object i.

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