__init__.py 文件源码

def check_idle_cpu_usage(duration, allowed_part):
    if resource is None:
        # TODO: use https://code.google.com/p/psutil/
        from nose.plugins.skip import SkipTest
        raise SkipTest('CPU usage testing not supported (`import resource` failed)')

    r1 = resource.getrusage(resource.RUSAGE_SELF)
    eventlet.sleep(duration)
    r2 = resource.getrusage(resource.RUSAGE_SELF)
    utime = r2.ru_utime - r1.ru_utime
    stime = r2.ru_stime - r1.ru_stime

    # This check is reliably unreliable on Travis, presumably because of CPU
    # resources being quite restricted by the build environment. The workaround
    # is to apply an arbitrary factor that should be enough to make it work nicely.
    if os.environ.get('TRAVIS') == 'true':
        allowed_part *= 1.2

    assert utime + stime < duration * allowed_part, \
        "CPU usage over limit: user %.0f%% sys %.0f%% allowed %.0f%%" % (
            utime / duration * 100, stime / duration * 100,
            allowed_part * 100)