b2g-cpulimit.sh

#!/bin/bash

# cpulimit must be installed...
# - homebrew: "brew install cpulimit"
# - make from https://github.com/opsengine/cpulimit
CPULIMIT_BIN=cpulimit

# The CPU percentage may be, e.g. 800 for an 8-core machine.
# See the docs for `cpulimit`.
PERCENT_CPU=50

# Perpetually wait for a B2G process to appear by grepping
# the process list for "shell.html".
while true; do
  # pgrep's "-f" option is used to search the argument lists as well.
  for pid in `pgrep -f shell.html`; do
    # cpulimit will block until the process exits, which is ideal when
    # running "make test-integration" as it runs one instance at a time.
    $CPULIMIT_BIN -l ${PERCENT_CPU} -p ${pid}
  done
  # and then we search again after a moment.
  sleep 0.1
done