ems-typed/Tests/barrier.js

Persistent Shared Memory and Parallel Programming Model

/*-----------------------------------------------------------------------------+
 |  Extended Memory Semantics (EMS)                            Version 1.4.0   |
 |  Synthetic Semantics       http://www.synsem.com/       mogill@synsem.com   |
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 |  Copyright (c) 2015-2016, Jace A Mogill.  All rights reserved.              |
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'use strict';
var ems = require('ems')(process.argv[2]);
var assert = require('assert');

var iter, idx, memVal;
var nIters = Math.floor(100000 / process.argv[2]);
var sums = ems.new(ems.nThreads);
sums.writeXF(ems.myID, 0);



for (iter = 0; iter < nIters; iter += 1) {
    ems.barrier();
    idx = (ems.myID + iter) % ems.nThreads;
    memVal = sums.read(idx);
    assert(memVal === iter,
        "myID=" + ems.myID + "  iter=" + iter + "  memval=" + memVal);
    sums.write(idx, memVal + 1);
}
ems.barrier(100);


for (iter = 0; iter < nIters; iter += 1) {
    ems.barrier();
    idx = (ems.myID + iter) % ems.nThreads;
    memVal = sums.read(idx);
    sums.write(idx, memVal + 1);
}
ems.barrier();

assert(sums.read(ems.myID) === (nIters * 2),
    "myID=" + ems.myID + "  wrong final  memval=" + sums.read(ems.myID) + "  expected=" + (nIters * 2));

ems.barrier();

var shared = ems.new(process.argv[2]*2, 0, "/tmp/EMS_mynewFoo");

shared.write(0, 0);
ems.barrier();
var tmp = shared.read(0);
assert(tmp === 0, "Didn't initialize to 0, got " + tmp);
ems.barrier();
shared.faa(0, 1);
ems.barrier();
assert(shared.read(0) === ems.nThreads, "Didn't count (" + shared.read(0) + ") to nnodes (" + ems.nThreads + ")");
ems.barrier();
if (ems.myID === 0) {
    shared.write(0, 0);
}
ems.barrier();
assert(shared.read(0) === 0, "reinit Didn't initialize to 0, got " + shared.read(0));
ems.barrier();

var nIter = 10000;
var i;
for (i = 0; i < nIter; i += 1) {
    shared.faa(0, 1);
}
ems.barrier();
assert(shared.read(0) === ems.nThreads * nIter, "Random wait FAA failed: count (" + shared.read(0) + ") to nnodes (" + nIter + ")");

ems.barrier();
if (ems.myID === 0) {
    shared.write(0, 0);
}
ems.barrier();
if (ems.myID !== 0) {
    assert(shared.read(0) === 0, "Didn't pass sync after clearing");
}

ems.barrier();
// nIter = 10000 / process.argv[2];

for (i = 0; i < nIter; i += 1) {
    shared.faa(0, 1);
}
ems.barrier();
var sr = shared.read(0);
ems.barrier();
assert(sr === ems.nThreads * nIter, "Fast Looped FAA failed: count (" + sr + ") to nnodes (" + nIter + ")");


var timeout = -1;
try {
    timeout = ems.barrier(0);
    console.log("Barrier timeout succeeded but should have failed");
} catch (err) {
    ems.diag("Correctly timed out at barrier:", err);
}
assert(timeout <= 0);