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Add config var to allow disabling automatic CPU group assignment for threads - #38568
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kouvel
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Jun 29, 2020
Contributor
- When CPU groups are enabled through config, some new threads (Thread.Start, thread pool threads) are automatically assigned to a CPU group, starting with the process' CPU group and once it is filled up, assigning new threads to a different CPU group. An app may have native components that also use threads, and may want to do its own thread-spreading (for instance in DllMain), this config allows such apps to disable the automatic CPU group assignment which would otherwise override an assignment made in DllMain. The new config var does not affect GC threads.
- This was requested for .NET Framework, porting to .NET Core as well
…threads - When CPU groups are enabled through config, some new threads (Thread.Start, thread pool threads) are automatically assigned to a CPU group, starting with the process' CPU group and once it is filled up, assigning new threads to a different CPU group. An app may have native components that also use threads, and may want to do its own thread-spreading (for instance in DllMain), this config allows such apps to disable the automatic CPU group assignment which would otherwise override an assignment made in DllMain. The new config var does not affect GC threads. - This was requested for .NET Framework, porting to .NET Core as well
mangod9
reviewed
Jun 29, 2020
| RETAIL_CONFIG_DWORD_INFO(INTERNAL_Thread_DeadThreadCountThresholdForGCTrigger, W("Thread_DeadThreadCountThresholdForGCTrigger"), 75, "In the heuristics to clean up dead threads, this threshold must be reached before triggering a GC will be considered. Set to 0 to disable triggering a GC based on dead threads.") | ||
| RETAIL_CONFIG_DWORD_INFO(INTERNAL_Thread_DeadThreadGCTriggerPeriodMilliseconds, W("Thread_DeadThreadGCTriggerPeriodMilliseconds"), 1000 * 60 * 30, "In the heuristics to clean up dead threads, this much time must have elapsed since the previous max-generation GC before triggering another GC will be considered") | ||
| RETAIL_CONFIG_DWORD_INFO(EXTERNAL_Thread_UseAllCpuGroups, W("Thread_UseAllCpuGroups"), 0, "Specifies whether to query and use CPU group information for determining the processor count.") | ||
| RETAIL_CONFIG_DWORD_INFO(EXTERNAL_Thread_AssignCpuGroups, W("Thread_AssignCpuGroups"), 1, "Specifies whether to automatically distribute threads created by the CLR across CPU Groups. Effective only when Thread_UseAllCpuGroups and GCCpuGroup are enabled.") |
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do these get auto documented, or needs manual doc updates?
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Looks like it will need manual update to https://docs.microsoft.com/en-us/dotnet/framework/configure-apps/file-schema/runtime/thread-useallcpugroups-element and to add a similar element in the docs repo
mangod9
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Jun 29, 2020
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mangod9
approved these changes
Jun 29, 2020
kouvel
commented
Jul 2, 2020
ContributorAuthor
Flagged as no-merge for now, waiting for the change to go into .NET Framework first |
Jacksondr5 pushed a commit
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Aug 10, 2020
…threads (dotnet#38568) - When CPU groups are enabled through config, some new threads (Thread.Start, thread pool threads) are automatically assigned to a CPU group, starting with the process' CPU group and once it is filled up, assigning new threads to a different CPU group. An app may have native components that also use threads, and may want to do its own thread-spreading (for instance in DllMain), this config allows such apps to disable the automatic CPU group assignment which would otherwise override an assignment made in DllMain. The new config var does not affect GC threads. - This was requested for .NET Framework, porting to .NET Core as well
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