node-redis/buffer_bench.js

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");
}