github.com/b-2019-apt-test/divider

Divider

Divider is a tiny CLI tool intended for passing aptitude test. Divider reads a stream of JSON-encoded jobs from file, processes them with call to external library and writes results to another file in CSV format.

Getting started

Install with go install:

$ go get -u github.com/b-2019-apt-test/divider
$ go install github.com/b-2019-apt-test/divider/cmd/divider

Usage

The only required argument is the path to the file with jobs:

$ divider -i jobs.json

By default, divider writes results to divider.csv file at the same directory level. You can specify alternative path:

$ divider -i jobs.json -o results.csv

You can specify division method with -m flag:

$ divider -i jobs.json -m cgo

Available methods: go, cgo, syscall (default). Option -z has precedence over the -m flag: if both defined, go method will be used.

Run divider without arguments to see the full usage info.

Dependencies

Divider depends on external library math.dll: it's assumed that the library is already installed on the system. Although, you can run divider with its own division implementation using -z option:

$ divider -i jobs.json -z

For cgo method to work, the library must be installed on the system as magic.dll.

Benchmarks

Benchmarks for calldiv and cgodiv demonstrate almost linear scaling:

$ go test github.com/b-2019-apt-test/divider/pkg/div/... -v -run none -bench=Parallel$ -benchmem -benchtime=5s -cpu 1,2,4,8,16,32,64,128

Build and test

pkg-config is used for cgo dependencies management. You can find sample config under the build directory of the repository.