Create aligned buffers to make faster disk io with less iops
npm install aligned-bufferAligned buffers will allow you to read data from disk much faster than you think you can.
For example, if you read 64k blocks from disk to aligned buffers, you may get 50% speed-up.
Install it as usual from npm:
``
npm install aligned-buffer
Require module:
`javascript`
var aligned = require("aligned-buffer");
Getting alignment:
`javascript`
var alignment = aligned.alignment();
Getting aligned buffer:
`javascript`
var buf = aligned.buffer(/ alignment, don't change/ aligned.alignment(), / size / 1024 * 64);
You will need at least node-0.8.9 to support O_DIRECT flag.
If you want to use it with older node, you need to find out O_DIRECT
value by yourself (fgrep O_DIRECT /usr/include on linux for linux).
`javascript
var fs = require("aligned");
constants = process.binding("constants"),
fd = fs.openSync("/my_big_file", constants.O_RDONLY | constants.O_DIRECT),
size = 64 * 1024, // 64k blocks
buf = aligned.buffer(aligned.alignment(), size),
offset = 0;
// offset should be aligned to buf.length,
// so allowed values are: 0, 64k, 128k, 172k
// if offset is not aligned you will receive no boost
fs.read(fd, buf, 0, buf.length, offset, function(error) {
if (error) {
console.log(error);
return;
}
console.log("successful read!");
});
``