@VisibleForTesting
void init(LinuxContainerExecutor lce, ResourceCalculatorPlugin plugin) throws IOException {
initConfig();
// mount cgroups if requested
if (cgroupMount && cgroupMountPath != null) {
ArrayList<String> cgroupKVs = new ArrayList<String>();
cgroupKVs.add(CONTROLLER_CPU + "=" + cgroupMountPath + "/" + CONTROLLER_CPU);
lce.mountCgroups(cgroupKVs, cgroupPrefix);
}
initializeControllerPaths();
// cap overall usage to the number of cores allocated to YARN
yarnProcessors = NodeManagerHardwareUtils.getContainersCores(plugin, conf);
int systemProcessors = plugin.getNumProcessors();
if (systemProcessors != (int) yarnProcessors) {
LOG.info("YARN containers restricted to " + yarnProcessors + " cores");
int[] limits = getOverallLimits(yarnProcessors);
updateCgroup(CONTROLLER_CPU, "", CPU_PERIOD_US, String.valueOf(limits[0]));
updateCgroup(CONTROLLER_CPU, "", CPU_QUOTA_US, String.valueOf(limits[1]));
} else if (cpuLimitsExist()) {
LOG.info("Removing CPU constraints for YARN containers.");
updateCgroup(CONTROLLER_CPU, "", CPU_QUOTA_US, String.valueOf(-1));
}
}
