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'use strict';
load('jstests/libs/parallelTester.js'); // for ScopedThread and CountDownLatch
load('jstests/concurrency/fsm_libs/worker_thread.js'); // for workerThread
/**
* Helper for spawning and joining worker threads.
*/
var ThreadManager = function(clusterOptions, executionMode) {
if (!(this instanceof ThreadManager)) {
return new ThreadManager(clusterOptions, executionMode);
}
function makeThread(workloads, args, options) {
// Wrap the execution of 'threadFn' in a try/finally block
// to ensure that the database connection implicitly created
// within the thread's scope is closed.
var guardedThreadFn = function(threadFn, workloads, args, options) {
try {
return threadFn(workloads, args, options);
} finally {
db = null;
gc();
}
};
if (executionMode.composed) {
return new ScopedThread(guardedThreadFn, workerThread.composed,
workloads, args, options);
}
return new ScopedThread(guardedThreadFn, workerThread.fsm,
workloads, args, options);
}
var latch;
var initialized = false;
var threads = [];
var threadCounts = {};
var _workloads, _context;
this.init = function init(workloads, context, maxAllowedThreads) {
assert.eq('number', typeof maxAllowedThreads,
'the maximum allowed threads must be a number');
assert.gt(maxAllowedThreads, 0, 'the maximum allowed threads must be positive');
assert.eq(maxAllowedThreads, Math.floor(maxAllowedThreads),
'the maximum allowed threads must be an integer');
function computeNumThreads() {
return Array.sum(workloads.map(function(workload) {
return threadCounts[workload];
}));
}
workloads.forEach(function(workload) {
var config = context[workload].config;
threadCounts[workload] = config.threadCount;
});
var requestedNumThreads = computeNumThreads();
if (requestedNumThreads > maxAllowedThreads) {
// Scale down the requested '$config.threadCount' values to make
// them sum to less than 'maxAllowedThreads'
var factor = maxAllowedThreads / requestedNumThreads;
workloads.forEach(function(workload) {
var threadCount = threadCounts[workload];
threadCount = Math.floor(factor * threadCount);
threadCount = Math.max(1, threadCount); // ensure workload is executed
threadCounts[workload] = threadCount;
});
}
var numThreads = computeNumThreads();
assert.lte(numThreads, maxAllowedThreads);
latch = new CountDownLatch(numThreads);
var plural = numThreads === 1 ? '' : 's';
print('Using ' + numThreads + ' thread' + plural +
' (requested ' + requestedNumThreads + ')');
_workloads = workloads;
_context = context;
initialized = true;
};
this.spawnAll = function spawnAll(host, options) {
if (!initialized) {
throw new Error('thread manager has not been initialized yet');
}
var workloadData = {};
_workloads.forEach(function(workload) {
workloadData[workload] = _context[workload].config.data;
});
var tid = 0;
_workloads.forEach(function(workload) {
var workloads = [workload]; // worker thread only needs to load 'workload'
if (executionMode.composed) {
workloads = _workloads; // worker thread needs to load all workloads
}
var config = _context[workload].config;
for (var i = 0; i < threadCounts[workload]; ++i) {
var args = {
tid: tid++,
data: workloadData,
host: host,
latch: latch,
dbName: _context[workload].dbName,
collName: _context[workload].collName,
clusterOptions: clusterOptions,
seed: Random.randInt(1e13), // contains range of Date.getTime()
globalAssertLevel: globalAssertLevel
};
var t = makeThread(workloads, args, options);
threads.push(t);
t.start();
}
});
};
this.checkFailed = function checkFailed(allowedFailurePercent) {
if (!initialized) {
throw new Error('thread manager has not been initialized yet');
}
var failedThreadIndexes = [];
function handleFailedThread(thread, index) {
if (thread.hasFailed() && !Array.contains(failedThreadIndexes, index)) {
failedThreadIndexes.push(index);
latch.countDown();
}
}
while (latch.getCount() > 0) {
threads.forEach(handleFailedThread);
sleep(100);
}
var failedThreads = failedThreadIndexes.length;
if (failedThreads > 0) {
print(failedThreads + ' thread(s) threw a JS or C++ exception while spawning');
}
if (failedThreads / threads.length > allowedFailurePercent) {
throw new Error('Too many worker threads failed to spawn - aborting');
}
};
this.joinAll = function joinAll() {
if (!initialized) {
throw new Error('thread manager has not been initialized yet');
}
var errors = [];
threads.forEach(function(t) {
t.join();
var data = t.returnData();
if (data && !data.ok) {
errors.push(data);
}
});
initialized = false;
threads = [];
threadCounts = {};
return errors;
};
};
/**
* Extensions to the 'workerThread' module for executing a single FSM-based
* workload and a composition of them, respectively.
*/
workerThread.fsm = function(workloads, args, options) {
load('jstests/concurrency/fsm_libs/worker_thread.js'); // for workerThread.main
load('jstests/concurrency/fsm_libs/fsm.js'); // for fsm.run
return workerThread.main(workloads, args, function(configs) {
var workloads = Object.keys(configs);
assert.eq(1, workloads.length);
fsm.run(configs[workloads[0]]);
});
};
workerThread.composed = function(workloads, args, options) {
load('jstests/concurrency/fsm_libs/worker_thread.js'); // for workerThread.main
load('jstests/concurrency/fsm_libs/composer.js'); // for composer.run
return workerThread.main(workloads, args, function(configs) {
composer.run(workloads, configs, options);
});
};
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