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Test the speed of different ways of copying a small buffer.

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Matt Ranney
2010-09-17 01:17:19 -07:00
parent 64ad8b1bb8
commit 09465ff6be
1 changed files with 37 additions and 0 deletions
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buffer_bench.js Normal file
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var source = new Buffer(100),
dest = new Buffer(100), i, j, k, count = 1000000, bytes = 100;
for (i = 99 ; i >= 0 ; i--) {
source[i] = 120;
}
for (i = bytes ; i > 0 ; i--) {
var start = new Date();
for (j = count ; j > 0 ; j--) {
for (k = i ; k > 0 ; k--) {
dest[k] = source[k];
}
}
var end = new Date();
console.log("Manual copy " + i + " bytes " + (end - start) + " ms");
}
for (i = bytes ; i > 0 ; i--) {
var start = new Date();
for (j = count ; j > 0 ; j--) {
for (k = i ; k > 0 ; k--) {
dest[k] = 120;
}
}
var end = new Date();
console.log("Direct assignment " + i + " bytes " + (end - start) + " ms");
}
for (i = bytes ; i > 0 ; i--) {
var start = new Date();
for (j = count ; j > 0 ; j--) {
source.copy(dest, 0, 0, i);
}
var end = new Date();
console.log("Buffer.copy() " + i + " bytes " + (end - start) + " ms");
}