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common.js
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common.js
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function execute(name, func) {
var auto = false;
var numChunks = 1;
var chunkSize = 1;
try {
var u = new URL(window.location);
var query = u.search.substr(1);
var chunks;
var size;
if (window.URLSearchParams) {
var params = new URLSearchParams(query);
chunks = params.get('chunks');
size = ~~params.get('size');
} else {
var paramDescriptions = query.split('&');
var params = {};
for (var i = 0; i < paramDescriptions.length; ++i) {
var description = paramDescriptions[i].split('=');
params[description[0]] = description[1];
}
chunks = params['chunks'];
size = ~~params['size'];
}
if (chunks === 'auto') {
auto = true;
} else if (~~chunks > 0) {
numChunks = ~~chunks;
}
if (size > 0) {
chunkSize = size;
}
} catch(e) {
// if we can't get a numChunks override, just use default
}
function test(numChunks) {
return runTest(name, func, numChunks, chunkSize);
}
if (auto) {
numChunks = 1;
function nextTest() {
if (numChunks >= 8192) {
return;
}
numChunks *= 2;
return test(numChunks).then(nextTest);
}
test(numChunks).then(nextTest);
} else {
test(numChunks);
}
}
function runTest(name, func, numChunks, chunkSize) {
return new Promise(function(resolve, reject) {
var suite = new Benchmark.Suite();
display('---------------');
display('Testing ' + numChunks + ' chunks of ' + chunkSize + ' bytes per operation.');
suite
.add(name, function (deferred) {
func(numChunks, chunkSize).then(function() {
deferred.resolve();
});
}, { defer: true })
.on('cycle', function (event) {
display(event.target.toString());
})
.on('complete', function (event) {
display('Fastest is ' + this.filter('fastest').pluck('name'));
resolve();
})
.on('error', function (event) {
display('Error has occured: "' + event.target.error.message + '" in ' +
event.target.name);
reject(event.target);
})
.run();
});
}
function display(value) {
var resultList = document.getElementById('output');
var result = document.createElement('div');
result.textContent = value;
resultList.appendChild(result);
}
function makePromiseReader(numChunks, chunkSize) {
var data = new Array(numChunks);
for (var i = 0; i < data.length; ++i) {
data[i] = new ArrayBuffer(chunkSize);
}
var nextChunk = 0;
return {
read: function() {
if (nextChunk >= data.length) {
return Promise.resolve({ value: undefined, done: true });
}
return Promise.resolve({ value: data[nextChunk++], done: false });
}
};
}
function executePromise(numChunks, chunkSize) {
var reader = makePromiseReader(numChunks, chunkSize);
return reader.read().then(handleChunk);
function handleChunk(result) {
if (result.done) {
return;
}
// Avoid loop being optimized away
if (result.value[0] > 0) {
throw new Error('this should never happen');
}
return reader.read().then(handleChunk);
}
}
function makeSyncReader(numChunks, chunkSize) {
var data = new Array(numChunks);
for (var i = 0; i < data.length; ++i) {
data[i] = new ArrayBuffer(chunkSize);
}
var nextChunk = 0;
return {
read: function() {
if (nextChunk >= data.length) {
return { value: undefined, done: true };
}
return { value: data[nextChunk++], done: false };
}
};
}
function executeSync(numChunks, chunkSize) {
var reader = makeSyncReader(numChunks, chunkSize);
var result;
while (true) {
result = reader.read();
if (result.done) {
// Use a real promise here to note completion in async fashion. This is
// necessary to avoid benchmark.js hitting our nested setTimeout()
// throttling.
return Promise.resolve();
}
// Avoid loop being optimized away
if (result.value[0] > 0) {
throw new Error('this should never happen');
}
}
}