fastcommp

Filecoin fast piece commitment summation tool.

usage

package main

import (
    "fmt"
    "github.com/application-research/fastcommp"
)

func main() {
    fast := new(fastcommp.CommpWriter)
    fast.Write(data)
    sum, err := fast.Sum()
    if err != nil {
        panic(err)
    }
    fmt.Printf("commP: %s\n", sum.PieceCID.String())
}

build

make build

execute

./fastcommp <carfile.car>

optional: create car dummy data

1. create an 8 GiB test file

dd if=/dev/urandom of=8G-payload.bin bs=1M count=8192

2. car it up with https://github.com/ipld/go-car (install with go install github.com/ipld/go-car/cmd/car@latest)

car c --version 1 -f 8G-payload.bin.car 8G-payload.bin

benchmarks

* benchmarks run on optimized AMD hardware with ~1TB available memory