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## Copyright (C) 2015-2020 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} {} install_vars (@var{varname}, @dots{}, @var{connections})
## Install named variables at remote machines.
##
## The variables named in the arguments are distrubted to the remote
## machines specified by @var{connections} and installed there. The
## variables must be accessible within the calling function. If
## variables have been declared to have global scope, they will also
## have global scope at the remote machines.
##
## This function can only be successfully called at the client machine.
## See @code{pconnect} for a description of the @var{connections}
## variable. @var{connections} can contain all connections of the
## network, a subset of them, or a single connection. The local machine
## (client), if contained in @var{connections}, is ignored.
##
## To install, e.g., all visible variables,
##
## @code{install_vars (who ()@{:@}, @dots{});}
##
## can be used.
##
## Internally, this function sends the variables only to one server and
## then issues the necessary commands to distribute them to all
## specified servers over server-to-server data connections.
##
## @seealso{pconnect, pserver, sclose, rfeval, netcellfun}
## @end deftypefn
function ret = install_vars (varargin)
if ((nargs = nargin ()) < 1 || ...
! iscellstr (varnames = varargin(1 : end - 1)))
print_usage ();
endif
fname = "install_vars";
if (! isa (conns = varargin{end}, "pconnections"))
error ("%s: `connections' must be a parallel connections object", fname);
endif
## reval() will check if specified at server side
## delete local machine from connections if present
conns = conns(! [network_get_info(conns).local_machine]);
if ((nhosts = numel (conns)) == 0)
return;
endif
if ((nvars = numel (varnames)) == 0)
return;
endif
## get an index translation into the remote variable of connections
## ('sockets')
ridx = [network_get_info(conns).real_node_id] + 1;
## retrieve cell-array of variable values from variable names in
## calling function
[vars{1:nvars}] = evalin("caller",
sprintf ("{%s%s}{:}", varnames{1},
ifelse (nvars > 1,
sprintf (", %s", varnames{2:end}),
"")));
## retrieve logical vector of corresponding 'global' states
vglobal = __visglobal__ (varnames);
## construct binary tree of transfers
source_hosts = 1;
source_id = zeros (0, 1);
target_ids = zeros (0, 2);
[source_id, target_ids] = add_transfers (source_id, target_ids,
source_hosts, nhosts);
if (any (vglobal))
recv_cmd1 = sprintf ("%s%s%s",
"global ",
sprintf ("%s ", varnames{vglobal}),
"; ");
else
recv_cmd1 = "";
endif
## we need a temporary for easily sending the vars to the next server
recv_cmd2_mask = sprintf ("__pserver_tvars__ = precv (sockets(%%i)); [%s%s] = __pserver_tvars__{:}; ",
varnames{1},
ifelse (nvars > 1,
sprintf (", %s", varnames{2:end}),
""));
recv_cmd_mask = cstrcat (recv_cmd1, recv_cmd2_mask);
send_cmd_mask = "psend (__pserver_tvars__, sockets([%s]));";
## It is better to reval the recv command and the possibly following
## send commands for a specific server within the same string.
## Otherwise the client or a server might block if the command string
## does not fit into the socket buffers (and we may have long command
## strings here).
error_in_first_command = false;
ready = false;
unwind_protect
## initial transfer
recv_cmd = sprintf (recv_cmd_mask, 1);
if (nhosts > 1)
send_cmd = sprintf (send_cmd_mask,
get_ridx_string (target_ids(1, :), ridx));
else
send_cmd = "";
endif
cmd = sprintf ("%s%s", recv_cmd, send_cmd);
try
reval (cmd, conns(1));
catch
error_in_first_command = true;
error (lasterror ());
end_try_catch
psend (vars, conns(1));
## remote transfers
for ida = 1 : numel (source_id)
for idb = 1:2
if ((did = target_ids(ida, idb)) != 0)
recv_cmd = sprintf (recv_cmd_mask, ridx(source_id(ida)));
if (isempty (sid = find (source_id == did)))
send_cmd = "";
else
send_cmd = sprintf (send_cmd_mask,
get_ridx_string (target_ids(sid, :), ...
ridx));
endif
cmd = sprintf ("%s%s", recv_cmd, send_cmd);
reval (cmd, conns(did));
endif
endfor
endfor
ready = true;
unwind_protect_cleanup
if (! (ready || error_in_first_command))
sclose (conns);
endif
end_unwind_protect
endfunction
function ret = get_ridx_string (targ_idx, ridx)
ret = sprintf ("%i", ridx(targ_idx(1)));
if (targ_idx(2) != 0)
ret = sprintf ("%s, %i", ret, ridx(targ_idx(2)));
endif
endfunction
function [source_id, target_ids] = add_transfers (source_id, target_ids,
source_hosts, nhosts)
if ((left = nhosts - source_hosts(end)) == 0)
return;
endif
new_source_hosts = zeros (1, 0);
for idb = 1:2 # two branches
for ids = 1 : (nsh = numel (source_hosts))
current_target_id = nhosts + 1 - left;
if (idb == 1)
source_id = vertcat (source_id, source_hosts(ids));
target_ids = vertcat (target_ids, [current_target_id, 0]);
else
target_ids(end + ids - nsh, 2) = current_target_id;
endif
new_source_hosts = horzcat (new_source_hosts, current_target_id);
left--;
if (left == 0) break; endif
endfor # source hosts
if (left == 0) break; endif
endfor # two branches
[source_id, target_ids] = add_transfers (source_id, target_ids,
new_source_hosts,
nhosts);
endfunction
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