Package Exports

fast-crc32c
fast-crc32c/impls/js_crc32c

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (fast-crc32c) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

fast-crc32c

fast-crc32c is a CRC-32C algorithm implementation for node.js, which uses hardware acceleration (via voxer/sse4_crc32 by Anand Suresh), and fallback to software implementation when hardware acceleration fails.

Performance

CRC-32C is faster then CRC-32, which could take advantage of full CPU operand register width (64bit) instead of CRC-32's 8bit.

When using hardware acceleration, CRC-32C is about 7x ~ 9x faster than software implemented CRC-32C.

Benchmark

The 3 tested implementations are:

sse4_crc32c Hardware accelerated CRC-32C from sse4_crc32
js_crc32c Javascript implemented CRC-32C
js_crc32 Javascript implemented CRC-32 from buffer-crc32

$ npm run-script benchmark

> fast-crc32c@1.0.2 benchmark /Users/xshi/Projects/node-fast-crc32c
> node benchmark

sse4_crc32c_hw for inputs 1024B x 1,837,024 ops/sec ±1.76% (83 runs sampled)
sse4_crc32c_hw for inputs 16856835B, avg 2057B x 203 ops/sec ±2.37% (78 runs sampled)
sse4_crc32c_sw for inputs 1024B x 911,096 ops/sec ±1.07% (85 runs sampled)
sse4_crc32c_sw for inputs 16856835B, avg 2057B x 72.74 ops/sec ±1.29% (72 runs sampled)
js_crc32c for inputs 1024B x 356,253 ops/sec ±1.07% (86 runs sampled)
js_crc32c for inputs 16856835B, avg 2057B x 22.40 ops/sec ±1.09% (41 runs sampled)
js_crc32 for inputs 1024B x 351,668 ops/sec ±0.94% (87 runs sampled)
js_crc32 for inputs 16856835B, avg 2057B x 22.25 ops/sec ±1.11% (40 runs sampled)

	1024B	16856835B, avg 2057B
sse4_crc32c_hw	1,837,024 ops/sec	203 ops/sec
sse4_crc32c_sw	911,096 ops/sec	72.74 ops/sec
js_crc32c	356,253 ops/sec	22.40 ops/sec
js_crc32	351,668 ops/sec	22.25 ops/sec

Install

npm install fast-crc32c --save

Usage

var crc32 = require('fast-crc32c');
var result = crc32.calculate(data, initial);

data required, String|Buffer, data to digest
initial optional, Number, initial CRC-32C digest