public void GroupMasksAreNotZero()
{
var groupInfo = MultiProcessorInformation.GetGroupsInfo();
foreach (var group in groupInfo.Groups)
{
Assert.True(group.ActiveProcessorMask != UIntPtr.Zero);
}
}
public void CanSetProcessorGroup()
{
// get the first group so we can extract its affinity
var firstGroup = MultiProcessorInformation.GetGroupsInfo().Groups.First();
foreach (ProcessThread pt in Process.GetCurrentProcess().Threads)
{
// set the thread affinity to the first group on the system (group 0)
pt.SetProcessorGroup(0, firstGroup.ActiveProcessorMask);
// only process the first thread
break;
}
}
static void Main(string[] args)
{
// print information about group affinities for processor packages
var packages = MultiProcessorInformation.GetProcessorPackageInfo();
for (int i = 0; i < packages.Length; i++)
{
Console.WriteLine($"Processor Package {i}:");
foreach (var affinity in packages[i].Affinities)
{
Console.WriteLine($"\tAffinity: {affinity.Group} (mask: {affinity.Mask.ToUInt64():x16})");
}
}
Console.WriteLine();
// print information about group affinities for processor cores
var cores = MultiProcessorInformation.GetProcessorCoreInfo();
Console.WriteLine($"Core Count: {cores.Length}");
for (int i = 0; i < cores.Length; i++)
{
Console.WriteLine($"Processor Core {i} (SMT: {cores[i].IsSMT}, Efficiency Class {cores[i].EfficiencyClass})");
foreach (var affinity in cores[i].Affinities)
{
Console.WriteLine($"\tAffinity: {affinity.Group} (Mask: {affinity.Mask.ToUInt64():x16})");
}
}
Console.WriteLine();
// print information about processor caches and their associated affinities
var caches = MultiProcessorInformation.GetCacheInfo();
Console.WriteLine($"Cache Count: {caches.Length}");
for (int i = 0; i < caches.Length; i++)
{
Console.WriteLine($"Cache {i}:");
Console.WriteLine($"\t Level: {caches[i].Level}");
Console.WriteLine($"\t Associativity: {caches[i].Associativity}");
Console.WriteLine($"\t Line Size: {caches[i].LineSize}");
Console.WriteLine($"\t Cache Size: {caches[i].Level}");
Console.WriteLine($"\t Group Number: {caches[i].Affinity.Group}");
Console.WriteLine($"\t Group Mask: {caches[i].Affinity.Mask.ToUInt64():x16}");
}
Console.WriteLine();
// print information about processor groups on the system
var groupInfo = MultiProcessorInformation.GetGroupsInfo();
Console.WriteLine($"Maximum Group Count: {groupInfo.MaximumGroupCount}");
Console.WriteLine($"Active Group Count: {groupInfo.ActiveGroupCount}");
Console.WriteLine("Active Groups:");
for (int i = 0; i < groupInfo.Groups.Length; i++)
{
Console.WriteLine($"\tGroup {i} (Active Count: {groupInfo.Groups[i].ActiveProcessorCount}, Maximum Count: {groupInfo.Groups[i].MaximumProcessorCount}, Mask: {groupInfo.Groups[i].ActiveProcessorMask.ToUInt64():x16})");
}
Console.WriteLine();
// get the process group numbers associated with the current process
ushort[] processGroups = Process.GetCurrentProcess().GetGroupAffinity();
Console.WriteLine("Current Process Group Numbers: {" + string.Join(", ", processGroups) + "}");
Console.WriteLine();
// print the group affinities for all native threads in the current process
foreach (ProcessThread pt in Process.GetCurrentProcess().Threads)
{
var affinity = pt.GetProcessorGroup();
Console.WriteLine($"Thread {pt.Id.ToString().PadRight(8, ' ')} is assigned group {affinity.Group.ToString().PadRight(2, ' ')} (mask {affinity.Mask.ToUInt64():x16})");
}
Console.WriteLine();
// set the processor group for a native thread to group number 0 with a mask of 0xff (the default)
Process.GetCurrentProcess().Threads[0].SetProcessorGroup(0, new UIntPtr(0xff));
}
public void GroupInfoReturnsData()
{
var groupInfo = MultiProcessorInformation.GetGroupsInfo();
Assert.NotEmpty(groupInfo.Groups);
}