public virtual void TestGetContainerCores()
{
YarnConfiguration conf = new YarnConfiguration();
float ret;
int numProcessors = 4;
ResourceCalculatorPlugin plugin = Org.Mockito.Mockito.Mock <ResourceCalculatorPlugin
>();
Org.Mockito.Mockito.DoReturn(numProcessors).When(plugin).GetNumProcessors();
conf.SetInt(YarnConfiguration.NmResourcePercentagePhysicalCpuLimit, 0);
try
{
NodeManagerHardwareUtils.GetContainersCores(plugin, conf);
NUnit.Framework.Assert.Fail("getContainerCores should have thrown exception");
}
catch (ArgumentException)
{
}
// expected
conf.SetInt(YarnConfiguration.NmResourcePercentagePhysicalCpuLimit, 100);
ret = NodeManagerHardwareUtils.GetContainersCores(plugin, conf);
NUnit.Framework.Assert.AreEqual(4, (int)ret);
conf.SetInt(YarnConfiguration.NmResourcePercentagePhysicalCpuLimit, 50);
ret = NodeManagerHardwareUtils.GetContainersCores(plugin, conf);
NUnit.Framework.Assert.AreEqual(2, (int)ret);
conf.SetInt(YarnConfiguration.NmResourcePercentagePhysicalCpuLimit, 75);
ret = NodeManagerHardwareUtils.GetContainersCores(plugin, conf);
NUnit.Framework.Assert.AreEqual(3, (int)ret);
conf.SetInt(YarnConfiguration.NmResourcePercentagePhysicalCpuLimit, 85);
ret = NodeManagerHardwareUtils.GetContainersCores(plugin, conf);
NUnit.Framework.Assert.AreEqual(3.4, ret, 0.1);
conf.SetInt(YarnConfiguration.NmResourcePercentagePhysicalCpuLimit, 110);
ret = NodeManagerHardwareUtils.GetContainersCores(plugin, conf);
NUnit.Framework.Assert.AreEqual(4, (int)ret);
}
/// <summary>Returns the fraction of CPU cores that should be used for YARN containers.
/// </summary>
/// <remarks>
/// Returns the fraction of CPU cores that should be used for YARN containers.
/// The number is derived based on various configuration params such as
/// YarnConfiguration.NM_RESOURCE_PERCENTAGE_PHYSICAL_CPU_LIMIT
/// </remarks>
/// <param name="conf">- Configuration object</param>
/// <returns>Fraction of CPU cores to be used for YARN containers</returns>
public static float GetContainersCores(Configuration conf)
{
ResourceCalculatorPlugin plugin = ResourceCalculatorPlugin.GetResourceCalculatorPlugin
(null, conf);
return(NodeManagerHardwareUtils.GetContainersCores(plugin, conf));
}
internal virtual void Init(LinuxContainerExecutor lce, ResourceCalculatorPlugin plugin
)
{
InitConfig();
// mount cgroups if requested
if (cgroupMount && cgroupMountPath != null)
{
AList <string> cgroupKVs = new AList <string>();
cgroupKVs.AddItem(ControllerCpu + "=" + cgroupMountPath + "/" + ControllerCpu);
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(ControllerCpu, string.Empty, CpuPeriodUs, limits[0].ToString());
UpdateCgroup(ControllerCpu, string.Empty, CpuQuotaUs, limits[1].ToString());
}
else
{
if (CpuLimitsExist())
{
Log.Info("Removing CPU constraints for YARN containers.");
UpdateCgroup(ControllerCpu, string.Empty, CpuQuotaUs, (-1).ToString());
}
}
}