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a2466896dd
Adds additional `targetStart`, `targetEnd`, `sourceStart, and `sourceEnd` arguments to `Buffer.prototype.compare` to allow comparison of sub-ranges of two Buffers without requiring Buffer.prototype.slice() Fixes: https://github.com/nodejs/node/issues/521 PR-URL: https://github.com/nodejs/node/pull/5880 Reviewed-By: Trevor Norris <trev.norris@gmail.com>
59 lines
1.6 KiB
JavaScript
59 lines
1.6 KiB
JavaScript
'use strict';
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const common = require('../common.js');
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const v8 = require('v8');
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const bench = common.createBenchmark(main, {
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method: ['offset', 'slice'],
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size: [16, 512, 1024, 4096, 16386],
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millions: [1]
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});
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function compareUsingSlice(b0, b1, len, iter) {
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// Force optimization before starting the benchmark
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Buffer.compare(b0.slice(1, len), b1.slice(1, len));
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v8.setFlagsFromString('--allow_natives_syntax');
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eval('%OptimizeFunctionOnNextCall(Buffer.compare)');
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eval('%OptimizeFunctionOnNextCall(b0.slice)');
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eval('%OptimizeFunctionOnNextCall(b1.slice)');
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Buffer.compare(b0.slice(1, len), b1.slice(1, len));
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doCompareUsingSlice(b0, b1, len, iter);
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}
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function doCompareUsingSlice(b0, b1, len, iter) {
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var i;
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bench.start();
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for (i = 0; i < iter; i++)
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Buffer.compare(b0.slice(1, len), b1.slice(1, len));
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bench.end(iter / 1e6);
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}
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function compareUsingOffset(b0, b1, len, iter) {
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len = len + 1;
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// Force optimization before starting the benchmark
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b0.compare(b1, 1, len, 1, len);
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v8.setFlagsFromString('--allow_natives_syntax');
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eval('%OptimizeFunctionOnNextCall(b0.compare)');
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b0.compare(b1, 1, len, 1, len);
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doCompareUsingOffset(b0, b1, len, iter);
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}
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function doCompareUsingOffset(b0, b1, len, iter) {
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var i;
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bench.start();
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for (i = 0; i < iter; i++)
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b0.compare(b1, 1, len, 1, len);
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bench.end(iter / 1e6);
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}
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function main(conf) {
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const iter = (conf.millions >>> 0) * 1e6;
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const size = (conf.size >>> 0);
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const method = conf.method === 'slice' ?
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compareUsingSlice : compareUsingOffset;
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method(Buffer.alloc(size, 'a'),
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Buffer.alloc(size, 'b'),
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size >> 1,
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iter);
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}
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