Add config var to allow disabling automatic CPU group assignment for threads #38568
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Member
kouvel
commented
Jun 29, 2020
kouvel
commented
- 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
kouvel
force-pushed
the
AssignCpuGroupConfig
branch
from
c32e07c
to
49e3f99
Compare
mangod9
reviewed
Jun 29, 2020
| @@ -554,6 +554,8 @@ RETAIL_CONFIG_DWORD_INFO(INTERNAL_ThreadSuspendInjection, W("INTERNAL_ThreadSusp | |||
| RETAIL_CONFIG_DWORD_INFO(INTERNAL_DefaultStackSize, W("DefaultStackSize"), 0, "Stack size to use for new VM threads when thread is created with default stack size (dwStackSize == 0).") | |||
| 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.") | |||
There was a problem hiding this comment.
do these get auto documented, or needs manual doc updates?
There was a problem hiding this comment.
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
reviewed
Jun 29, 2020
mangod9
approved these changes
Jun 29, 2020
kouvel
added
the
NO-MERGE
|
Flagged as no-merge for now, waiting for the change to go into .NET Framework first |
kouvel
removed
the
NO-MERGE
Jacksondr5
pushed a commit
to Jacksondr5/runtime
that referenced
this pull request
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
ghost
locked as resolved and limited conversation to collaborators
Sign up for free
to subscribe to this conversation on GitHub.
Already have an account?
Sign in.
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.