/usr/share/octave/packages/parallel-2.2.0/bw_start.m is in octave-parallel 2.2.0-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 | ## Copyright (C) 2009 Olaf Till <i7tiol@t-online.de>
##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 3 of the License, or
## (at your option) any later version.
##
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program; if not, see <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File} {} bw_start ()
## @deftypefnx {Function File} {} bw_start (@var{f}, @var{argfile})
## Start parallel computation in a beowulf cluster.
##
## With no arguments, restart all unfinished jobs.
##
## With two arguments, (re)start job. String @var{f} names a function to
## be started multiple times in parallel. @var{argfile} names a data-file in
## the configured data directory containing a one-dimensional cell-array
## with arguments for @var{f}, one entry for each invocation of @var{f}. @var{f}
## must be of one of the following forms
##
## @example
## function @var{ret} = f (@var{args})
##
## function @var{ret} = f (@var{args}, @var{idx})
## @end example
##
## where @var{args} is an entry of the argument cell-array, @var{idx} is the
## index of this entry, and @var{ret} contains the result of computation.
##
## Users can put configuration commands into the file "~/.bwrc".
## Variable "data_dir" contains the configured data directory, default
## is "~/bw-data/". Directory given in variable "state_dir", default
## "~/.bw-state/", is used internally to read and write state
## information. If this directory does not exist it is created, which
## will fail if there would be more than one level to create.
## @seealso {bw_list, bw_retrieve, bw_clear}
## @end deftypefn
function bw_start (varargin)
if ((nargs = length (varargin)) > 2 || nargs == 1)
error "bw_start: incorrect number of arguments";
endif
for id = 1:nargs
if (! ischar (varargin{id}) || size (varargin{id}, 1) > 1)
error ("bw_start: argument %i not a (single) string", id);
endif
endfor
## default directories
data_dir = tilde_expand ("~/bw-data/");
state_dir = tilde_expand ("~/.bw-state/");
## configuration files
systemrc = fullfile (OCTAVE_HOME (), "share/octave/site/m/startup/bwrc");
userrc = "~/.bwrc";
## Read system-wide configuration, should provide
## "computing_machines", a cell-array with addresses, and
## "central_machine", a single address.
source (systemrc);
if (! exist ("central_machine"))
error ("bw_start: system configuration file should give \"central_machine\"");
endif
## Read per-user configuration.
if (! isempty (stat (userrc)))
source (userrc);
endif
data_dir = tilde_expand (data_dir);
state_dir = tilde_expand (state_dir);
if (isempty (stat (state_dir)))
mkdir (state_dir);
endif
if (nargs == 2)
job_tbl = {varargin{1}, varargin{2}};
n_j = 1;
state_files = {(sprintf ("%s-%s.state", job_tbl{1}, job_tbl{2}))};
else
n_j = length ...
((state_files = glob (fullfile (state_dir, "*.state"))));
job_tbl = cell (n_j, 2);
for id = 1:n_j
[discarded, discarded, discarded, tp] = ...
regexp (state_files{id}, "[^/]+$");
state_files{id} = tp{1};
job_tbl(id, :) = cellstr (split (state_files{id}, "-", 2))';
job_tbl{id, 2} = regexprep (job_tbl{id, 2}, '\.state$', "");
endfor
endif
n_s = 0;
for id = 1:n_j
if (nargs == 2 && ...
isempty (stat (fullfile (state_dir, state_files{1}))))
ready = 0;
elseif (all (__bw_load_variable__ ...
(fullfile (state_dir, state_files{id})) . ...
ready))
ready = 1;
else
ready = 0;
endif
if (! ready)
if ((tp = exist (job_tbl{id, 1})) < 2 || tp > 5)
error ("bw_start: no function %s", job_tbl{id, 1});
endif
if (isempty (stat (fullfile (data_dir, job_tbl{id, 2}))))
error ("bw_start: no such file %s", ...
fullfile (data_dir, job_tb{id, 2}));
endif
n_s++;
[estat, output] = ...
system (sprintf ("ssh %s \"nohup octave -q --eval \\\"__bw_scheduler__ (\\\\\\\"%s\\\\\\\", \\\\\\\"%s\\\\\\\")\\\" &> /dev/null &\"", ...
central_machine, ...
job_tbl{id, 1}, ...
job_tbl{id, 2}));
if (estat == 0)
printf ("function %s, datafile %s: job started\n", ...
job_tbl{id, 1}, job_tbl{id, 2});
else
error ("function %s, datafile %s: ssh returned exit status %i, output: %s", ...
job_tbl{id, 1}, job_tbl{id, 2}, estat, output);
endif
endif
endfor
if (nargs == 2 && n_s == 0)
printf ("bw_start: computation is ready\n");
endif
endfunction
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