11,567 questions
You must start the process first.
Like in the MS sample for threads : ProcessThread.ProcessorAffinity
InvalidOperationException when processor affinity is being set.
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Narendra V
1
Reputation point
After creation of the process as shown below . I am getting the following exception "System.InvalidOperationException: 'No process is associated with this object.'". Please let me know
how to resolve this exception.
Process cmdline = new Process();
cmdline.ProcessorAffinity = (IntPtr)0x0001;
Developer technologies C#
{count} votes
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Jack J Jun 25,296 Reputation points2022-05-04T03:03:52.14+00:00 @Narendra V , is any update? Do you have any question about the exception?
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Narendra V 1 Reputation point
2022-05-04T08:32:03.91+00:00 Hi,
I haven't received any satisfactory reply regarding why the "InvalidOperationException" exception is happening. Below is the code for which I am getting the exception.
using (Process cmdline = new Process())
{
cmdline.StartInfo.FileName = "cmd";
cmdline.StartInfo.Arguments = "/C " + "mkdir C:\dummy";
cmdline.Start();
cmdline.ProcessorAffinity = (IntPtr)0x0001;
} -
Castorix31 90,521 Reputation points2022-05-04T09:13:49.26+00:00 You change the code on each message
You said you had the exception with 0x0010 not 0x0001 an I explained why with 0x0010. -
Narendra V 1 Reputation point
2022-05-04T09:46:19.763+00:00 Exception is coming for both 0x0010 and 0x0001. I have a server which has 32 cores So setting it to 0x0010 should not be a problem. What if somebody else here in this forum who is try to solve this issue has a system with only 4 cores. If that is the case then 0x0010 which maps to 5th core might cause some other issue.
To make things more simple can you explain why the exception is coming for 0x0001 case ?. Can you suggest necessary changes to the below code to make it work without any exception?
using (Process cmdline = new Process())
{
cmdline.StartInfo.FileName = "cmd";
cmdline.StartInfo.Arguments = "/C " + "mkdir C:\dummy";
cmdline.Start();
cmdline.ProcessorAffinity = (IntPtr)0x0001;
} -
Castorix31 90,521 Reputation points
2022-05-04T11:14:22.467+00:00 I cannot reproduce the problem with 0x0001 on my OS (Windows 10 21H1, 2 cores)
Except if I set a break point, then the process has exited and I can add :if (!cmdline.HasExited) cmdline.ProcessorAffinity = (IntPtr)0x0001;
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2 answers
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Castorix31 90,521 Reputation points
2022-04-29T13:57:10.437+00:00 -
Narendra V 1 Reputation point
2022-04-30T07:42:17.473+00:00 Now the same error is coming during the execution of "cmd.Threads"
cmd.Start();
ProcessThreadCollection threads;
threads = cmd.Threads; -
Narendra V 1 Reputation point
2022-04-30T07:54:45.397+00:00 Instead of setting the affinity via threads, why cannot we set the process affinity after process start. But with the below code the same exception is observed.
cmd.Start();
cmd.ProcessorAffinity = (IntPtr)0x0001; -
Castorix31 90,521 Reputation points
2022-04-30T08:43:17.51+00:00 Of course you can, but where is your process name ?!
A simple test with Notepad : (you can check that Affinity is changed with Process Explorer)
using (Process p = new Process()) { p.StartInfo.FileName = "notepad"; p.Start(); p.ProcessorAffinity = (IntPtr)0x0001; } -
Narendra V 1 Reputation point
2022-04-30T14:28:24.88+00:00 This is what I am trying for which I am getting an exception:
using (Process cmdline = new Process()) { cmdline.StartInfo.FileName = "cmd"; cmdline.StartInfo.Arguments = "/C " + "mkdir C:\\dummy"; cmdline.Start(); cmdline.ProcessorAffinity = (IntPtr)0x0010; } -
Castorix31 90,521 Reputation points
2022-05-01T06:04:49.337+00:00 The affinity 0x0010 is incorrect
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Narendra V 1 Reputation point
2022-05-01T06:34:30.603+00:00 Why cann't we set the Process affinity to 2nd core?
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Castorix31 90,521 Reputation points
2022-05-01T07:53:30.16+00:00 You can see the table at system.diagnostics.process.processoraffinity
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Narendra V 1 Reputation point
2022-05-01T08:14:04.43+00:00 Looks like I am being taken for a ride here. With no clear explanation.
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Castorix31 90,521 Reputation points
2022-05-01T08:15:43.957+00:00 If 0x0001 =>1 and 0x0003 => 1 and 2
then 2 is 0x0002... -
Narendra V 1 Reputation point
2022-05-01T08:56:40.247+00:00 This doesn't explain the exception
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Castorix31 90,521 Reputation points
2022-05-01T10:09:26.08+00:00 But you set 0x0010, not 0x0002
Then on your system, 0x0010 = ERROR_INVALID_PARAMETER
then System.ComponentModel.Win32Exception -
Narendra V 1 Reputation point
2022-05-01T10:20:45.627+00:00 Why setting of priority to 5th core should be invalid.
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Castorix31 90,521 Reputation points
2022-05-01T11:47:14.16+00:00 Can you set it with Task Manager or Process Explorer on cmd.exe ?
For example, you modify your command line to add a Pause and remove ProcessorAffinity (or set a valid value) to avoid exception :
cmdline.StartInfo.Arguments = "/C " + "mkdir C:\\dummy&PAUSE"; -
Narendra V 1 Reputation point
2022-05-01T12:04:29.357+00:00 As we are automating the process and we don't want to set it manually via task manager. We want to do this via command line only.
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Castorix31 90,521 Reputation points
2022-05-01T12:27:44.46+00:00 Yes, but the purpose is to test if you can change the affinity with this value with Task Manager or Process Explorer,
to see if you get invalid parameter on your Core 5.
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Narendra V 1 Reputation point
2022-05-01T02:38:34.433+00:00 Can you please explain what is normal here and why exception is being thrown?