/usr/share/yorick/i0/mpy.i is in yorick-mpy-common 2.2.04+dfsg1-9.
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* $Id: mpy.i,v 1.8 2011-02-11 05:25:42 dhmunro Exp $
* Message passing extensions to Yorick.
*/
/* Copyright (c) 2009, The Regents of the University of California.
* All rights reserved.
* This file is part of yorick (http://yorick.sourceforge.net).
* Read the accompanying LICENSE file for details.
*/
/* if (is_void(plug_in)) plug_in, "mpy"; */
if (!is_func(mp_send)) error, "mpy built with TGT=dll, must build TGT=exe";
/*= SECTION() MPI parallel processing interface ============================*/
local mp_rank;
local mp_size;
local mp_nfan;
/* DOCUMENT mp_rank, mp_size, mp_nfan
* MPI rank of this process and total number of processes.
* 0 <= mp_rank <= mp_size-1
* The variables are set at startup. DO NOT CHANGE THESE VALUES!
* If multiple processes are not present, mp_size==1 and mp_rank=0.
* mp_nfan is the fanout used to broadcast messages by the mp_exec,
* mp_handout, and mp_handin functions. See mpy_nfan.
*
* SEE ALSO: mp_send, mp_recv, mp_exec, mpy_nfan
*/
extern mp_exec;
/* DOCUMENT mp_exec, command_line
* or mp_exec, [command_line1, command_line2, ...]
* or mp_exec, char_array
* or is_serial = mp_exec()
*
* The mp_exec function is how you launch all parallel tasks.
* COMMAND_LINE is a string to be parsed and executed on every
* rank. It can be a single string, or an array of strings,
* or an array of char containing the text to be parsed.
*
* Calling mp_exec on a non-0 rank process is illegal with the
* sole exception of the call in mpy_idler. There, the call to
* mp_exec blocks until the matching call to mp_exec on rank 0
* broadcasts the command(s) to all ranks. At that point, all
* non-zero ranks exit their idler, and execute the command;
* returning to the idle loop to wait for the next call to mp_exec
* on rank 0 to re-awaken them.
*
* On rank 0, mp_exec executes the command in immediate mode,
* as if by include,[command_line],1. Hence, the commands are
* parsed and executed before mp_exec returns. Outside of the
* mp_exec function calls (and after startup), rank 0 is always
* in serial mode -- any activity, particularly include, require,
* or #include, affect only rank 0. It is only "inside" a call
* to mp_exec that rank 0 is in parallel mode, where the include
* functions are collective operations. The mp_exec function
* may only be called in serial mode (which means it cannot be
* called recursively).
*
* However, mp_exec() may be called as a function at any time
* on any rank. It returns 1 if and only if a call to mp_exec
* as a subroutine (launching a parallel task) would be legal,
* that is, only if this is rank 0 in serial mode.
*
* SEE ALSO: mp_include, mp_send, mp_rank, mp_cd, mp_connect
*/
extern mp_send;
/* DOCUMENT mp_send, to, msg
* or mp_send, to, msg1, msg2, ...
* or mp_send, to_list, msg1, msg2, ...
*
* send MSG, MSG1, MSG2, ... to process whose rank is TO. Each
* MSG must be an array (or scalar) of type char, short, int, long,
* float, double, complex, or a scalar string.
*
* If TO_LIST is an array of rank numbers, then each MSG may be an
* equal length array of pointers to send a different message to
* each process in the TO_LIST, or one of the basic data types to
* send the same message to each process in TO_LIST.
*
* The mp_send function will not return until the msg variables can
* be discarded or reused.
*
* Messages can be arrays, but their dimension information is not
* included in the actual message (they look like 1D arrays upon
* arrival). You can use the vpack/vunpack functions to send and
* receive messages in a way the preserves their dimension
* information, and to pack several small messages together for
* improved message passing performance:
* mp_send, to, vpack(msg1, msg2, ...);
* which you receive as:
* vunpack, mp_recv(from), msg1, msg2, ...;
* String arrays and nil [] messages are permitted with vpack and
* vunpack, in addition to the array data types permitted by the
* raw mp_send and mp_recv functions.
*
* If you need to pass pointer or struct messages, use vsave:
* mp_send, to, vsave(msg1, msg2, ...);
* which you receive as:
* restore, openb(mp_recv(from)), msg1, msg2, ...;
*
* Use mp_handout to send messages from rank 0 to all ranks;
* very large TO_LIST arguments (more than a few dozen recipients)
* will be dramatically slower than mp_handout.
*
* SEE ALSO: mp_recv, mp_probe, mp_rank, mp_exec, mp_handout, vpack
*/
extern mp_recv;
/* DOCUMENT msg = mp_recv(from)
* or msg = mp_recv(from, dimlist)
* or mp_recv, from, msg1, msg2, msg3, ...;
*
* receive the next message from the process whose rank is FROM.
* Messages from a given rank are always received in the order
* they are sent with mp_send.
*
* The mp_recv function blocks until the next matching message
* arrives. Any messages from ranks other than FROM which arrive
* before the message from FROM are queued internally, and will be
* returned by subsequent calls to mp_recv order of arrival. The
* mp_probe function lets you query the state of this internal queue.
*
* Array dimensions are not part of the message; if you send an array
* x, it will be received as x(*). There are two ways to put back
* dimension information, depending on whether you want the sender
* to send the information, or whether you want the receiver to apply
* its own knowledge of what the dimensions must have been:
*
* You can use the vpack/vunpack functions to send messages that
* contain the dimension information of arrays:
* mp_send, to, vpack(msg1, msg2, ...);
* which you receive as:
* vunpack, mp_recv(from), msg1, msg2, ...;
*
* Or, you can pass mp_recv (on the receiving side) an explicit
* DIMLIST in the same format as the array function. The arriving
* message must have the correct number of elements for the DIMLIST,
* or a multiple of that number; the result will have either the
* DIMLIST dimensions, or with an extra dimension tacked on the end
* if the arriving message is a multiple. (That is, you are really
* specifying the dimensions of the "cells" of which the message is
* to be composed.) By default (and as a special case), the result of
* mp_recv will be either a scalar value, or a 1D array of the same
* type as the matching send.
*
* Called as a subroutine, mp_recv can return multiple messages; MSG1,
* MSG2, MSG3, ... are simple variable references set to the result.
* Any or all of the MSGi may be preceded by a dimlist expression
* (not a simple variable reference) to specify a dimension list for
* that MSGi output.
*
* The mp_reform function can add a DIMLIST after the mp_recv call:
* mp_reform(mp_recv(p),dimlist) is the same as mp_recv(p,dimlist).
*
* SEE ALSO: mp_probe, mp_send, mp_rank, mp_handout, mp_exec,
* mp_reform, vunpack
*/
extern mp_probe;
/* DOCUMENT ranks = mp_probe(block)
*
* return list of the ranks of processes which have sent messages
* to this process that are waiting in the mp_recv queue. If the
* queue is empty and BLOCK is nil or 0, mp_probe returns nil [].
* If BLOCK == 1 then mp_probe blocks until at least one message
* is queued, but returns immediately if the queue is not empty. If
* BLOCK >= 2 then mp_probe always blocks until the next message
* arrives, even if the queue was not empty. The returned list of
* ranks is always in the order received, so that
* mp_recv(mp_probe(1)(1))
* returns the next message to arrive from any rank (without leaving
* you any way to find out what rank sent the message -- save the
* result of mp_probe if you need to know).
*
* The mpy program always receives all available MPI messages
* before returning from any mp_recv, mp_send, or blocking mp_probe
* call, so that the MPI library message buffers are emptied as
* soon as possible.
*
* SEE ALSO: mp_recv, mp_send, mp_rank, mp_exec
*/
extern mpy_nfan;
/* DOCUMENT mp_exec, "mpy_nfan,"+print(nfan)(1);
* Resets the mp_size, mp_rank, and mp_nfan variables. The NFAN
* argument can be 0 to restore the initial fanout, otherwise NFAN
* must be between 2 and 64.
* This is a very dangerous function, and is needed only in the
* very rare circumstance that the default value for mp_nfan is not
* good enough. About the only legal way to invoke mpy_nfan is
* directly vian mp_exec.
* SEE ALSO: mp_exec, mp_boss, mp_staff, mp_handout
*/
mpy_nfan; /* special call finishes initializing mpy */
if (mp_size && mp_size<1) { mp_size=1; mp_rank=0; }
/* ------------------------------------------------------------------------ */
func mp_reform(x, ..)
/* DOCUMENT mp_reform(x, dimlist)
* returns array X reshaped according to dimension list DIMLIST.
* If x is longer than dimlist, uses dimlist as the leading
* dimensions of x, adding one trailing dimension. This is the
* same convention as the mp_recv(dimlist) function uses:
* mp_reform(mp_recv(),dimlist) is the same as mp_recv(dimlist).
* SEE ALSO: reform, array, dimsof
*/
{
local dims;
while (more_args()) accum_dimlist, dims, next_arg();
n = dims(1);
for (i=len=1 ; i<=n ; ++i) len *= dims(i+1);
if (n || numberof(x)==len) y = array(structof(x), dims);
else y = array(structof(x), dims, numberof(x)/len);
if (n || numberof(x)>len) y(*) = x(*);
else y = x;
return y;
}
func mp_boss(void)
/* DOCUMENT boss = mp_boss()
* get the rank of the "boss" for this process, or nil [] if this
* is rank 0. The boss is the process from which fanout messages are
* sent to this process.
* SEE ALSO: mp_nfan, mp_staff, mp_handout
*/
{
if (!mp_rank) return [];
return (mp_rank - 1) / mp_nfan;
}
func mp_staff(void)
/* DOCUMENT staff = mp_staff()
* get the list of ranks of the "staff" for this process, or nil [] if
* this is a leaf process. The staff are the processes to which fanout
* messages are sent by this process.
* SEE ALSO: mp_boss, mp_nfan, mp_handout
*/
{
if (!mp_nfan || mp_size<2) return [];
staff = mp_rank*mp_nfan + indgen(mp_nfan);
return staff(where(staff < mp_size));
}
func mp_handout(args)
/* DOCUMENT mp_handout, var1, var2, ...
*
* distribute VAR1, VAR2, etc. to all processes. On rank 0, the VARi
* are inputs, on all other ranks the VARi are outputs. The mp_handout
* operation is collective, so it must be called on all ranks. The
* operation uses the same logarithmic fanout as the MPY include
* operation. The VARi must be arrays of numbers or strings.
* if (!mp_rank) {
* array1 = <something>;
* array2 = <something else>;
* ...
* }
* mp_handout, array1, array2, ...;
*
* The VARi are combined into a single message using vpack, so the
* string arrays are allowed, and array dimensions are preserved.
* The VARi may not be pointers or structs.
*
* SEE ALSO: mp_handin, mp_nfan, mp_send, mp_recv
*/
{
if (!mp_size || mp_size<2) return;
if (numberof(args(-))) error, "unrecognized keyword";
n = args(0);
if (!n) error, "requires at least one argument to hand out";
boss = mp_boss();
if (is_void(boss)) {
f = vopen(,1);
for (i=1 ; i<=n ; ++i) vpack, f, args(i);
msg = vpack(f);
} else {
msg = mp_recv(boss);
}
staff = mp_staff();
if (numberof(staff)) mp_send, staff, msg;
if (mp_rank) {
for (i=1 ; ; ++i) {
if (args(0,i)) error, "arguments must be simple variable references";
args, i, vunpack(msg, -);
if (i >= n) break;
if (vunpack(msg)) error, "boss sent too few messages";
}
if (!vunpack(msg)) error, "boss sent too many messages";
}
}
wrap_args, mp_handout;
func mp_handin(part, reduce)
/* DOCUMENT mp_handin
* or result = mp_handin(part)
* or result = mp_handin(part, reduce)
* or result = mp_handin(part, min)
* or result = mp_handin(part, max)
* or result = mp_handin(part, sum)
* acknowledge completion to rank 0. The mp_handin function must be
* called on all ranks; it uses the same logarithmic fanout as mp_handout,
* but in the reverse direction, with messages beginning at the leaf ranks
* and propagating to their bosses until finally reaching rank 0.
* In the second form, PART can be any numeric array; RESULT will be
* the sum of PART for this rank and all its staff. The PART array,
* if present, must have the same dimensions on every rank.
* You may supply a REDUCE argument to get a reduction function other than
* REDUCE may be either one of the index range functions min, max, or
* sum (the default), or an interpreted function REDUCE(a,b) returning
* the combination of a and b you wish to return. The default, sum,
* returns a+b. REDUCE must be commutative and associative.
* SEE ALSO: mp_handout, mp_send, mp_recv
*/
{
if (!mp_size || mp_size<2) return part;
if (is_void(part)) part = 0;
if (is_void(reduce)) {
reduce = _sum_reduce;
} else if (is_range(reduce)) {
reduce = print(reduce)(1);
if (reduce == "min::") reduce = _min_reduce;
else if (reduce == "max::") reduce = _max_reduce;
else if (reduce == "sum::") reduce = _sum_reduce;
else error, "illegal reduction function "+reduce;
}
staff = mp_staff();
dims = dimsof(part);
part = part(*);
for (i=1 ; i<=numberof(staff) ; ++i) part = reduce(part, mp_recv(staff(i)));
boss = mp_boss();
if (!is_void(boss)) mp_send, boss, part;
return reform(part, dims);
}
func _min_reduce(a, b) { return min(a, b); }
func _max_reduce(a, b) { return max(a, b); }
func _sum_reduce(a, b) { return a + b; }
errs2caller, _min_reduce, _max_reduce, _sum_reduce;
func mp_require(filename)
/* DOCUMENT mp_require, filename
* same as mp_include, but does parallel require instead of include.
* SEE ALSO: mp_include
*/
{
mp_exec, "require,\""+filename+"\";";
}
func mp_include(filename)
/* DOCUMENT mp_include, filename
* call mp_exec with "include,filename".
*
* The ordinary #include directive and the include and require
* functions, when used as part of a parallel task (and at startup,
* which is effectively a parallel task), are collective operations
* requiring that all ranks reach them simultaneously, and in a state
* in which an mp_handout operation originating at rank 0 works.
* When rank 0 is running outside a parallel task, #include, include,
* and require happen only on rank 0. The mp_include function always
* forces the parallel include.
*
* A call to mp_include is legal only on rank 0 in serial mode.
*
* SEE ALSO: mp_exec, mp_require, include, mp_rank, mp_cd
*/
{
mp_exec, "include,\""+filename+"\";";
}
func mp_cd(dirname)
/* DOCUMENT mp_cd, dirname
* or mp_cd
*
* Change all processes to directory DIRNAME, or to the current
* working directory of the rank 0 process if DIRNAME is not
* specified. Note that DIRNAME must exist for all processes.
* Note also that the processes may start in different directories.
*
* The mp_cd function can only be called from rank 0 in serial mode.
*
* SEE ALSO: mp_handout, mp_rank, mp_include
*/
{
if (mp_rank) error, "can only be called from rank 0";
if (is_void(dirname)) dirname = get_cwd();
if (structof(dirname)!=string || strlen(dirname)<1)
error, "dirname must be a non-empty string";
mp_exec, "cd,\""+dirname+"\";";
}
func mp_set_debug(onoff)
/* DOCUMENT mp_set_debug, onoff
*
* Set mp_debug to ONOFF on all ranks. ONOFF non-zero turns on
* copious debugging messages, printed on stdout, with all ranks
* jumbled together.
*
* The mp_set_debug function is legal only from rank 0 in serial mode.
*
* SEE ALSO: mp_dbg, mp_handout, mp_rank, mp_include
*/
{
if (mp_rank) error, "can only be called from rank 0";
mp_exec, "mp_debug="+print(!(!onoff))(1)+";";
}
extern mp_dbstate; /* compiled debug printing switch */
func mp_dbg(msg)
/* DOCUMENT mp_dbg, msg
* print mpy debugging message MSG if and only if mp_debug is set.
* SEE ALSO: mp_set_debug
*/
{
if (mp_debug) write, "@"+print(mp_rank)(1)+": "+(is_void(msg)?"":msg);
}
func mp_connect(rank, prompt=)
/* DOCUMENT mp_connect, rank
* connect to non-zero RANK. Rank 0 enters a loop collecting command lines
* and sending them to this rank for execution. Exit by calling mp_disconnect.
* Do not attempt to perform other parallel operations; you are in a parallel
* task in which all ranks other than 0 and RANK happen to be finished.
* You cannot send incomplete command lines.
* The prompt (on rank 0) mp_conprompt defaults to "rank%ld> ", which you
* can change with the prompt= keyword. If prompt contains "%ld", the rank
* connected will appear in the prompt.
* SEE ALSO: mp_exec, mp_disconnect
*/
{
if (mp_rank) error, "called on non-0 rank";
prank = print(rank)(1);
if (rank<1 || rank>=mp_size) error, "no connection to rank " + prank;
_mp_connect = _mp_connect0; /* only called on rank 0 */
mp_exec, "_mp_connect,"+prank;
}
func _mp_connect0(rank)
{
/* we are still inside mp_exec, inside mp_connect */
extern _mp_conrank;
_mp_conrank = rank;
if (is_void(prompt)) prompt = "rank%ld> ";
if (strmatch(prompt, "%")) prompt = swrite(format=prompt,rank);
/* _mp_connect1 needs to be called at idle time */
_mpy_set_idler, _mp_connect1;
/* need to emulate _mp_connect for call from mp_connect */
mp_send, _mp_conrank, "_mp_conprompt=\""+prompt+"\"";
line = mp_recv(_mp_conrank);
}
func _mp_connect1
{
/* we have been called as idler to get a line and pass it on
* note that rdline fails if called inside an immediate include
* (and mp_exec does an immediate include on rank 0)
* note that prompt was issued by _mp_conrank on previous call
*/
line = rdline(prompt="");
mp_exec, "_mp_connect,"+print(_mp_conrank)(1);
}
func _mp_connect(rank)
{
if (!mp_rank) {
mp_send, _mp_conrank, line; /* line is local to _mp_connect1 */
if (mp_recv(_mp_conrank)) _mp_conrank = [];
else _mpy_set_idler, _mp_connect1;
} else if (mp_rank==rank) {
extern _mp_conprompt;
_mp_disconnect = 0n;
/* dbexit from inside immediate include longjumps (clears stack) */
dbexit = quit = mp_disconnect;
include, [mp_recv(0)], 1;
mp_send, 0, _mp_disconnect;
if (_mp_disconnect) mp_dbexit, 0;
else write, format="%s", _mp_conprompt;
}
}
if (is_void(mp_dbexit)) mp_dbexit = dbexit;
func mp_disconnect(n) /* argument to mimic dbexit */
/* DOCUMENT mp_disconnect
* disconnect to end an mp_connect session.
* SEE ALSO: mp_connect
*/
{
extern _mp_disconnect, _mp_conprompt;
_mp_disconnect = 1n;
_mp_conprompt = [];
}
/* ------------------------------------------------------------------------ */
/* mpy.i is included before stdx.i, which calls include_all,
* which uses the non-scalable function lsdir
* define _include_all_hook that makes include_all scalable
* also redefine customize function to avoid non-mpy custom.i
*/
func _include_all_hook(dir)
{
if (!mp_rank) files = include_all_ls(dir);
if (mp_size && !mp_exec()) mp_handout, files;
return files;
}
if (mp_size) customize = noop;
func mpy_get_cmdln(void)
{
m = _mpy_cmdln;
_mpy_cmdln = [];
return m;
}
func mpy_process_argv(void)
{
if (get_command_line == process_argv) return command_line;
extern _mpy_cmdln;
if (is_void(get_command_line)) _mpy_cmdln = get_argv();
else _mpy_cmdln = get_command_line();
if (numberof(_mpy_cmdln)>=2) {
command_line = _mpy_cmdln(2:);
mask = (strpart(command_line, 1:2) == "-j");
j = (command_line(0) == "-j");
if (j) mask(0) = 0;
list = where(mask);
n = numberof(list);
if (n) {
file = strpart(command_line(list), 3:);
i = where(file == "");
if (numberof(i)) {
list = list(i) + 1;
file(i) = command_line(list);
mask(list) = 1;
}
}
if (j) mask(0) = 1;
list = where(mask);
if (numberof(list)) _mpy_cmdln(list+1) = string(0);
_mpy_cmdln = _mpy_cmdln(where(_mpy_cmdln));
q = (numberof(_mpy_cmdln) && anyof(_mpy_cmdln=="-q"));
}
if (!q) write, format="mpy initialized MPI on %ld processes\n", mp_size;
for (i=numberof(file) ; i>=1 ; --i) mp_include, file(i);
get_command_line = mpy_get_cmdln;
m = process_argv();
return m;
}
func mpy_idler
{
while (_mpy_idler) {
idler = _mpy_idler;
_mpy_idler = [];
idler;
}
if (mp_rank) {
extern _mpy_count;
_mpy_count = 0;
mp_exec; /* all parallel tasks created here */
_mpy_set_idler, mpy_idler;
} else if (!mp_exec()) {
mp_exec; /* turns off parallel mode on rank 0 */
extern after_error;
after_error = [];
}
}
_mpy_count = 0;
if (mp_rank) batch, 1;
if (is_void(_mpy_set_idler)) _mpy_set_idler = set_idler;
func set_idler(idler)
{
extern _mpy_idler;
_mpy_idler = idler;
}
if (mp_size) _mpy_set_idler, mpy_idler, (mp_rank? 3 : 2);
func mpy_after_error
{
extern after_error;
if (++_mpy_count < 10) {
_mpy_set_idler, mpy_idler;
} else {
after_error = [];
batch, 1;
_mpy_set_idler, , (mp_rank!=0);
error,"(FATAL) rank " + print(mp_rank)(1) + " quitting on fault loop";
}
}
/* mp_exec sets this on rank 0 as appropriate */
if (mp_size) after_error = mpy_after_error; /* reset in mpy_idler for rank 0 */
/* this is the rank 0 after_error function */
func mpy_on_fault
{
if (!mp_rank) {
/* enter loop sending command lines to dbug mode on mpy_frank */
if (!mpy_dbauto) {
write, mpy_frank,
format="Type <RETURN> now to debug on rank %ld\n";
line = rdline(prompt="> ");
if (strlen(line)) {
include, [line];
/* following mp_exec happens before above include */
if (!mpy_frank) dbexit, 0;
else mp_exec, "if(mp_rank==mpy_frank)dbexit,0";
return;
}
}
if (!mpy_quiet)
write, mpy_frank,
format="Entering dbug mode on rank %ld, type dbexit to exit\n";
if (mpy_frank) mp_connect, mpy_frank, prompt="dbug@%ld> ";
}
}
/* set to faulting rank before mpy_on_fault called */
local mpy_frank;
/* ------------------------------------------------------------------------ */
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