/// <summary>
/// Adjust scheduling options.
/// </summary>
/// <param name="settings">The new scheduling options. </param>
public void SetSchedulingOptions(MultiThreadSchedulingSettings settings)
{
if (_disposalComplete != null)
{
throw new ObjectDisposedException("Cannot set the number of threads for a disposed scheduler. ");
}
int numThreads;
if ((settings.Mode & MultiThreadCreationMode.OneThreadPerLogicalCpu) != 0)
{
// FIXME filter this list based on process CPU affinity
var cpuInfo = CpuTopologyInfo.GetList();
if ((settings.Mode & MultiThreadCreationMode.OneThreadPerCpuCore) == MultiThreadCreationMode.OneThreadPerCpuCore)
{
numThreads = CpuTopologyInfo.CountNumberOfCores(cpuInfo);
}
else
{
numThreads = cpuInfo.Length;
}
settings.NumberOfThreads = numThreads;
}
else
{
numThreads = settings.NumberOfThreads;
if (numThreads <= 0)
{
throw new ArgumentOutOfRangeException($"{nameof(MultiThreadSchedulingSettings)}.{nameof(MultiThreadSchedulingSettings.NumberOfThreads)} is out of range: {numThreads}");
}
}
// Cap at CPU quota, if requested.
// FIXME For dynamic updates to CPU quota we should read the quota ourselves
if ((settings.Mode & MultiThreadCreationMode.CapThreadsAtCpuQuota) != 0)
{
numThreads = Math.Min(numThreads, Environment.ProcessorCount);
}
if (numThreads == 0)
{
numThreads = 1;
}
SetNumberOfThreads(numThreads, settings.ThreadPriority);
// Publish new options, if SetNumberOfThreads does not fail
SchedulingOptions = settings;
}
private static CpuTopologyInfo[] Linux_GetList()
{
var cpuMask = new BitMask(stackalloc ulong[512]);
int cpuCount = 0;
foreach (var fullDirName in Directory.EnumerateDirectories("/sys/devices/system/cpu/"))
{
if (Linux_IsSysFsCpuDirectory(fullDirName, out var cpuIdShort))
{
cpuMask[cpuIdShort] = true;
cpuCount++;
}
}
var infoArray = new CpuTopologyInfo[cpuCount];
int cpuId = -1;
for (int i = 0; (cpuId = cpuMask.GetIndexOfNextOnBit(++cpuId)) >= 0; ++i)
{
infoArray[i] = Linux_ReadFromSysFsFile(cpuId);
}
return(infoArray);
}
