v8/test/intl/overrides/caching.js

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// Copyright 2013 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// Performance test for overriden methods. Makes sure that default case
// is faster (cached) than the general case.
// Default, cached.
var startTime = new Date();
for (var i = 0; i < 1000; i++) {
'a'.localeCompare('c');
}
var endTime = new Date();
var cachedTime = endTime.getTime() - startTime.getTime();
// Not cached.
startTime = new Date();
for (var i = 0; i < 1000; i++) {
'a'.localeCompare('c', 'sr');
}
endTime = new Date();
var nonCachedTime = endTime.getTime() - startTime.getTime();
// Using collator. Faster than default, but not by much.
var collator = Intl.Collator();
startTime = new Date();
for (var i = 0; i < 1000; i++) {
collator.compare('a', 'c');
}
endTime = new Date();
collatorTime = endTime.getTime() - startTime.getTime();
// Difference is within 20%.
assertTrue(collatorTime < cachedTime);
// Non-cached time is much slower, measured to 12.5 times.
assertTrue(cachedTime < nonCachedTime);