#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# Copyright (C) 2018-present ScyllaDB
#

#
# SPDX-License-Identifier: LicenseRef-ScyllaDB-Source-Available-1.0
#

# Guess and print out a good number of compiler jobs to
# run. Note that on an interactive desktop you will want
# to reduce this to allow more memory for your desktop,
# to avoid swapping. This is oriented at continuous
# integration machines that do not serve an interactive
# load as well.

import os

procs = os.sysconf('SC_NPROCESSORS_ONLN')
mem = os.sysconf('SC_PHYS_PAGES') * os.sysconf('SC_PAGESIZE')

mem_reserve = 1000000000
job_mem = 4000000000

jobs = min(procs, (mem-mem_reserve) // job_mem)
jobs = max(jobs, 1)

print(jobs)