Detect number of CPUs in .NET 1.1

  • Thread starter Thread starter Kevin Jackson
  • Start date Start date
K

Kevin Jackson

Hello,

How does one go about determining the number of processors a server has in
..NET???

Thanks
 
Hi,

Use WMI extensions (Remember to add reference to the System.Management.dll)

-- BEGIN CODE --

System.Management.SelectQuery query =
new System.Management.SelectQuery("SELECT NumberOfProcessors FROM
Win32_ComputerSystem");

System.Management.ManagementObjectSearcher searcher =
new System.Management.ManagementObjectSearcher(query);

System.Management.ManagementObjectCollection results = searcher.Get();

foreach (System.Management.ManagementBaseObject obj in results)
{
foreach (System.Management.PropertyData data in obj.Properties)
{
if (data.Value == null)
listBox1.Items.Add(data.Name + "=");
else
listBox1.Items.Add(data.Name + "=" + data.Value.ToString());
}
}

-- END CODE --

Hope this helps
 
You can also use WINAPI

add
using System.Runtime.InteropServices;
in using section
-- BEGIN CODE --

[StructLayout(LayoutKind.Sequential)]
public struct SYSTEM_INFO
{
public uint dwOemId;
public uint dwPageSize;
public uint lpMinimumApplicationAddress;
public uint lpMaximumApplicationAddress;
public uint dwActiveProcessorMask;
public uint dwNumberOfProcessors;
public uint dwProcessorType;
public uint dwAllocationGranularity;
public uint dwProcessorLevel;
public uint dwProcessorRevision;
}

[DllImport("kernel32")]
static extern void GetSystemInfo(ref SYSTEM_INFO pSI);

private uint GetNuberOfProcessors()
{
SYSTEM_INFO info = new SYSTEM_INFO();
GetSystemInfo(ref info);
return info.dwNumberOfProcessors;
}

-- END CODE --

hope this helps
 
Excellent, that was exactly what I was looking for.

Thanks


Milosz Skalecki said:
You can also use WINAPI

add
using System.Runtime.InteropServices;
in using section
-- BEGIN CODE --

[StructLayout(LayoutKind.Sequential)]
public struct SYSTEM_INFO
{
public uint dwOemId;
public uint dwPageSize;
public uint lpMinimumApplicationAddress;
public uint lpMaximumApplicationAddress;
public uint dwActiveProcessorMask;
public uint dwNumberOfProcessors;
public uint dwProcessorType;
public uint dwAllocationGranularity;
public uint dwProcessorLevel;
public uint dwProcessorRevision;
}

[DllImport("kernel32")]
static extern void GetSystemInfo(ref SYSTEM_INFO pSI);

private uint GetNuberOfProcessors()
{
SYSTEM_INFO info = new SYSTEM_INFO();
GetSystemInfo(ref info);
return info.dwNumberOfProcessors;
}

-- END CODE --

hope this helps
--
Milosz Skalecki
MCP, MCAD


Kevin Jackson said:
Hello,

How does one go about determining the number of processors a server has
in
..NET???

Thanks
Click to expand...
Click to expand...
 
Well, this count includes hyperthreaded procs.

Anyone know of code that can distinguish between real and hyperthreaded
procs?

Thanks

Milosz Skalecki said:
You can also use WINAPI

add
using System.Runtime.InteropServices;
in using section
-- BEGIN CODE --

[StructLayout(LayoutKind.Sequential)]
public struct SYSTEM_INFO
{
public uint dwOemId;
public uint dwPageSize;
public uint lpMinimumApplicationAddress;
public uint lpMaximumApplicationAddress;
public uint dwActiveProcessorMask;
public uint dwNumberOfProcessors;
public uint dwProcessorType;
public uint dwAllocationGranularity;
public uint dwProcessorLevel;
public uint dwProcessorRevision;
}

[DllImport("kernel32")]
static extern void GetSystemInfo(ref SYSTEM_INFO pSI);

private uint GetNuberOfProcessors()
{
SYSTEM_INFO info = new SYSTEM_INFO();
GetSystemInfo(ref info);
return info.dwNumberOfProcessors;
}

-- END CODE --

hope this helps
--
Milosz Skalecki
MCP, MCAD


Kevin Jackson said:
Hello,

How does one go about determining the number of processors a server has
in
..NET???

Thanks
Click to expand...
Click to expand...
 
Kevin said:
Well, this count includes hyperthreaded procs.

Anyone know of code that can distinguish between real and hyperthreaded
procs?

Thanks

Milosz Skalecki said:
You can also use WINAPI

add
using System.Runtime.InteropServices;
in using section
-- BEGIN CODE --

[StructLayout(LayoutKind.Sequential)]
public struct SYSTEM_INFO
{
public uint dwOemId;
public uint dwPageSize;
public uint lpMinimumApplicationAddress;
public uint lpMaximumApplicationAddress;
public uint dwActiveProcessorMask;
public uint dwNumberOfProcessors;
public uint dwProcessorType;
public uint dwAllocationGranularity;
public uint dwProcessorLevel;
public uint dwProcessorRevision;
}

[DllImport("kernel32")]
static extern void GetSystemInfo(ref SYSTEM_INFO pSI);

private uint GetNuberOfProcessors()
{
SYSTEM_INFO info = new SYSTEM_INFO();
GetSystemInfo(ref info);
return info.dwNumberOfProcessors;
}

-- END CODE --

hope this helps
--
Milosz Skalecki
MCP, MCAD


Kevin Jackson said:
Hello,

How does one go about determining the number of processors a server has
in
..NET???

Thanks
Click to expand...
Click to expand...
Click to expand...
Not just hyperthreaded CPUs (or virtual processors; and obviously two
physical CPUs too) but also dual core CPUs. Same story if you'd use WMI
to get the data. The only ways I know isn't exactly quick or simple (low
level stuff - rolling your own fancy class using various CPUID calls and
checks depending on VendorID/model; but there are also functions like
GetLogicalProcessorInformation). There's only so many ways to get the
information... I wish WMI's support improves in this area but I doubt
we'll see that unfortunately.
 
Yep you're right. I found some code snipets on Intel's site. Looks quite
involved. SQL Server is one application that knows the difference. Looks
like a challenge for someone to wrap this in a .NET class and then give it
back to the public domain. If I weren't so busy I would tackle it.

I'll keep looking to see if someone has already done it.


john smith said:
Kevin said:
Well, this count includes hyperthreaded procs.

Anyone know of code that can distinguish between real and hyperthreaded
procs?

Thanks

Milosz Skalecki said:
You can also use WINAPI

add
using System.Runtime.InteropServices;
in using section
-- BEGIN CODE --

[StructLayout(LayoutKind.Sequential)]
public struct SYSTEM_INFO
{
public uint dwOemId;
public uint dwPageSize;
public uint lpMinimumApplicationAddress;
public uint lpMaximumApplicationAddress;
public uint dwActiveProcessorMask;
public uint dwNumberOfProcessors;
public uint dwProcessorType;
public uint dwAllocationGranularity;
public uint dwProcessorLevel;
public uint dwProcessorRevision;
}

[DllImport("kernel32")]
static extern void GetSystemInfo(ref SYSTEM_INFO pSI);

private uint GetNuberOfProcessors()
{
SYSTEM_INFO info = new SYSTEM_INFO();
GetSystemInfo(ref info);
return info.dwNumberOfProcessors;
}

-- END CODE --

hope this helps
--
Milosz Skalecki
MCP, MCAD


:

Hello,

How does one go about determining the number of processors a server has
in
..NET???

Thanks
Click to expand...
Click to expand...
Not just hyperthreaded CPUs (or virtual processors; and obviously two
physical CPUs too) but also dual core CPUs. Same story if you'd use WMI to
get the data. The only ways I know isn't exactly quick or simple (low
level stuff - rolling your own fancy class using various CPUID calls and
checks depending on VendorID/model; but there are also functions like
GetLogicalProcessorInformation). There's only so many ways to get the
information... I wish WMI's support improves in this area but I doubt
we'll see that unfortunately.
Click to expand...
 
You can use WMI for this, you just have to interpret the ProcessorId
attribute (from win32_processor) returned from a call to cpuid.

For instance this is returned on my box.

ProcessorId = "178BFBFF00000F7A";

This represents the contents of the CpuInfo array index 3 and 0 for infotype
1.

The first four bytes are the index 3 DWORD values and the last four bytes
are the index 0 DWORD values.
So the first DWORD (index 3) are the feature bits.
the highest byte with value 17 (00010111) means: multicore, SSE2, SSE and
FXSAVE/FXRSTOR
Check MSDN for details on __cpuid() C runtime built-in and a sample.


The v2.0 CLR also knows the difference as it calls the (v2.0) C runtime
built-in __cpuid(). So if you realy needs the index 1 and 2 DWORDS you can
wrapp the __cpuid() call using PInvoke on V2.0


Willy.

| Yep you're right. I found some code snipets on Intel's site. Looks quite
| involved. SQL Server is one application that knows the difference. Looks
| like a challenge for someone to wrap this in a .NET class and then give it
| back to the public domain. If I weren't so busy I would tackle it.
|
| I'll keep looking to see if someone has already done it.
|
|
| | > Kevin Jackson wrote:
| >> Well, this count includes hyperthreaded procs.
| >>
| >> Anyone know of code that can distinguish between real and hyperthreaded
| >> procs?
| >>
| >> Thanks
| >>
| >> | >>> You can also use WINAPI
| >>>
| >>> add
| >>> using System.Runtime.InteropServices;
| >>> in using section
| >>> -- BEGIN CODE --
| >>>
| >>> [StructLayout(LayoutKind.Sequential)]
| >>> public struct SYSTEM_INFO
| >>> {
| >>> public uint dwOemId;
| >>> public uint dwPageSize;
| >>> public uint lpMinimumApplicationAddress;
| >>> public uint lpMaximumApplicationAddress;
| >>> public uint dwActiveProcessorMask;
| >>> public uint dwNumberOfProcessors;
| >>> public uint dwProcessorType;
| >>> public uint dwAllocationGranularity;
| >>> public uint dwProcessorLevel;
| >>> public uint dwProcessorRevision;
| >>> }
| >>>
| >>> [DllImport("kernel32")]
| >>> static extern void GetSystemInfo(ref SYSTEM_INFO pSI);
| >>>
| >>> private uint GetNuberOfProcessors()
| >>> {
| >>> SYSTEM_INFO info = new SYSTEM_INFO();
| >>> GetSystemInfo(ref info);
| >>> return info.dwNumberOfProcessors;
| >>> }
| >>>
| >>> -- END CODE --
| >>>
| >>> hope this helps
| >>> --
| >>> Milosz Skalecki
| >>> MCP, MCAD
| >>>
| >>>
| >>> "Kevin Jackson" wrote:
| >>>
| >>>> Hello,
| >>>>
| >>>> How does one go about determining the number of processors a server
has
| >>>> in
| >>>> ..NET???
| >>>>
| >>>> Thanks
| >>>>
| >>>>
| >>>>
| >>
| >>
| > Not just hyperthreaded CPUs (or virtual processors; and obviously two
| > physical CPUs too) but also dual core CPUs. Same story if you'd use WMI
to
| > get the data. The only ways I know isn't exactly quick or simple (low
| > level stuff - rolling your own fancy class using various CPUID calls and
| > checks depending on VendorID/model; but there are also functions like
| > GetLogicalProcessorInformation). There's only so many ways to get the
| > information... I wish WMI's support improves in this area but I doubt
| > we'll see that unfortunately.
|
|
 
WMI returns the (part of) cpuid stuff in the ProcessorId property of the
Win32_Process instance, this makes it possible to check if the processor is
a HT/Multicore.
See my other reply for details.

Willy.


| Kevin Jackson wrote:
| > Well, this count includes hyperthreaded procs.
| >
| > Anyone know of code that can distinguish between real and hyperthreaded
| > procs?
| >
| > Thanks
| >
| > | >> You can also use WINAPI
| >>
| >> add
| >> using System.Runtime.InteropServices;
| >> in using section
| >> -- BEGIN CODE --
| >>
| >> [StructLayout(LayoutKind.Sequential)]
| >> public struct SYSTEM_INFO
| >> {
| >> public uint dwOemId;
| >> public uint dwPageSize;
| >> public uint lpMinimumApplicationAddress;
| >> public uint lpMaximumApplicationAddress;
| >> public uint dwActiveProcessorMask;
| >> public uint dwNumberOfProcessors;
| >> public uint dwProcessorType;
| >> public uint dwAllocationGranularity;
| >> public uint dwProcessorLevel;
| >> public uint dwProcessorRevision;
| >> }
| >>
| >> [DllImport("kernel32")]
| >> static extern void GetSystemInfo(ref SYSTEM_INFO pSI);
| >>
| >> private uint GetNuberOfProcessors()
| >> {
| >> SYSTEM_INFO info = new SYSTEM_INFO();
| >> GetSystemInfo(ref info);
| >> return info.dwNumberOfProcessors;
| >> }
| >>
| >> -- END CODE --
| >>
| >> hope this helps
| >> --
| >> Milosz Skalecki
| >> MCP, MCAD
| >>
| >>
| >> "Kevin Jackson" wrote:
| >>
| >>> Hello,
| >>>
| >>> How does one go about determining the number of processors a server
has
| >>> in
| >>> ..NET???
| >>>
| >>> Thanks
| >>>
| >>>
| >>>
| >
| >
| Not just hyperthreaded CPUs (or virtual processors; and obviously two
| physical CPUs too) but also dual core CPUs. Same story if you'd use WMI
| to get the data. The only ways I know isn't exactly quick or simple (low
| level stuff - rolling your own fancy class using various CPUID calls and
| checks depending on VendorID/model; but there are also functions like
| GetLogicalProcessorInformation). There's only so many ways to get the
| information... I wish WMI's support improves in this area but I doubt
| we'll see that unfortunately.
 
Back
Top