Script to calculate Ansible forks based on the number of CPUs.

ansible_forks.sh

#!/bin/bash -eux

if nproc &>/dev/null; then
  CPUS=$(nproc)
elif grep -qc processor /proc/cpuinfo; then
  CPUS=$(grep -c processor /proc/cpuinfo)
elif sysctl -n hw.ncpu &>/dev/null; then
  CPUS=$(sysctl -n hw.ncpu)
else
  CPUS=1
fi

FORKS=$(( CPUS * 4 ))

if [[ "${FORKS}" -lt 5 ]]; then
  FORKS=5
fi

export ANSIBLE_FORKS="${FORKS}"