Slurm::Hostlist(3) Hostlist functions in libslurm


use Slurm;
$hostnames = "node1,node[2-5,12]";
$hl = Slurm::Hostlist::create($hostnames);
$cnt = $hl->count;
while($host = $hl->shift()) {
print $host, "\n";
print $hl->ranged_string(), "\n";


The Slurm::Hostlist class is a wrapper of the hostlist functions in libslurm. This package is loaded and bootstrapped with package Slurm.


$hl = Slurm::Hostlist::new($str);

Create a new hostlist from a string representation. Returns an opaque hostlist object. This is a CLASS METHOD.

The string representation ($str) may contain one or more hostnames or bracketed hostlists separated by either `,' or whitespace. A bracketed hostlist is denoted by a common prefix followed by a list of numeric ranges contained within brackets: e.g. ``tux[0-5,12,20-25]''.

To support systems with 3-D topography, a rectangular prism may be described using two three digit numbers separated by ``x'': e.g. ``bgl[123x456]''. This selects all nodes between 1 and 4 inclusive in the first dimension, between 2 and 5 in the second, and between 3 and 6 in the third dimension for a total of 4*4*4=64 nodes.

If $str is omitted, and empty hostlist is created and returned.

$cnt = $hl->count();

Return the number of hosts in the hostlist.

$pos = $hl->find($hostname);

Searches hostlist $hl for the first host matching $hostname and returns position in list if found.

Returns -1 if host is not found.

$cnt = $hl->push($hosts);

Push a string representation of hostnames onto a hostlist. The $hosts argument may take the same form as in create().

Returns the number of hostnames inserted into the list,

$cnt = $hl->push_host($hostname);

Push a single host onto the hostlist hl.

This function is more efficient than slurm_hostlist_push() for a single hostname, since the argument does not need to be checked for ranges.

Return value is 1 for success, 0 for failure.

$str = $hl->ranged_string();

Return the string representation of the hostlist $hl. ranged_string() will write a bracketed hostlist representation where possible.

$host = $hl->shift();

Returns the string representation of the first host in the hostlist or `undef' if the hostlist is empty or there was an error allocating memory. The host is removed from the hostlist.


Sort the hostlist $hl and remove duplicate entries.


This library is created by Hongjia Cao, <hjcao(AT)> and Danny Auble, <da(AT)>. It is distributed with SLURM.


This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.8.4 or, at your option, any later version of Perl 5 you may have available.