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.
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.
Note: Current software implementation didn't reflect that. But no slower than other tabled based CRC-32.
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
sse4_crc32c for inputs 1024B x 1,882,511 ops/sec ±0.91% (96 runs sampled)
sse4_crc32c for inputs 16696054B, avg 2038B x 161 ops/sec ±0.80% (85 runs sampled)
js_crc32c for inputs 1024B x 357,426 ops/sec ±1.09% (93 runs sampled)
js_crc32c for inputs 16696054B, avg 2038B x 21.91 ops/sec ±1.64% (41 runs sampled)
js_crc32 for inputs 1024B x 360,304 ops/sec ±0.94% (93 runs sampled)
js_crc32 for inputs 16696054B, avg 2038B x 23.17 ops/sec ±0.49% (43 runs sampled)
| Impl | 1024B | 16696054B, avg 2038B |
|---|---|---|
| sse4_crc32c | 1,882,511 ops/sec | 161 ops/sec |
| js_crc32c | 357,426 ops/sec | 21.91 ops/sec |
| js_crc32 | 360,304 ops/sec | 23.17 ops/sec |
npm install fast-crc32c --savevar crc32 = require('fast-crc32c');
var result = crc32.calculate(data, initial);- data required, String|Buffer, data to digest
- initial optional, Number, initial CRC-32C digest