How to find if hyperthreading is enabled using WMI
Hi,
I want to use WMI to check if hyperthreading is enabled for a list of machines. I am not sure if WMI can be reliably used for this.
This is the code i figured out after reading a lot of forums.
private int IsHyperThreadingEnabled(string MachineName)
{
try
{
Sockets = new List<string>();
int PhysicalCPU = 0;
int LogicalCPU = 0;
int returnValue = 0;
//Connection credentials to the remote computer - not needed if the logged in account has access
ConnectionOptions oConn = new ConnectionOptions();
//connect to remote machine
ManagementScope oMs = new ManagementScope(@"\\" + MachineName + @"\root\cimv2", oConn);
//query for remote machine
ObjectQuery oQuery = new ObjectQuery("Select * from Win32_Processor");
//Execute the query
ManagementObjectSearcher oSearcher = new ManagementObjectSearcher(oMs, oQuery);
//Get the results
ManagementObjectCollection oReturnCollection = oSearcher.Get();
//loop through found drives and write out info
foreach (ManagementObject mo in oReturnCollection)
{LogicalCPU++;
string SocketDesignation = mo.Properties["SocketDesignation"].Value.ToString();
//We will count the unique SocketDesignations to find
//the number of physical CPUs in the system.
if (!Sockets.Contains(SocketDesignation))
{
Sockets.Add(SocketDesignation);
}
}
PhysicalCPU = Sockets.Count;
//Are there more logical than physical cpus?
//If so, obviously we are hyperthreading.
if (LogicalCPU > PhysicalCPU)
{
returnValue = 1;
}
return returnValue;
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
return 0;
}
}
Will this code work for all kinds of processors, i mean Dual core,Core to duo, Quad core, machines with many processors etc.
Thanks in advance.
All Replies
This has been an issue for some time with Server 2003 and below (can't speak for Vista/2008 yet...). I have used a tool called HTdump which will tell you physical versus logical CPU's and then parsed the output. WMI will output logical CPU's because thats what shows up in most all places, device manager, task manger, sysinfo, etc. One other issue I have seen with this is servers with multiple cores and hyperthreading. HTDump is the way to go, IMO, unless someone else can jump in.
Thanks for your help Nick.
