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Document new threading settings #47575

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7fc191e
Document new threading settings
MichalStrehovsky Jul 25, 2025
2c938ed
Update threading.md
MichalStrehovsky Jul 25, 2025
d9cc746
Update docs/core/runtime-config/threading.md
jkotas Aug 15, 2025
50b6ae0
Update docs/core/runtime-config/threading.md
jkotas Aug 15, 2025
63c259c
Update docs/core/runtime-config/threading.md
jkotas Aug 15, 2025
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11 changes: 11 additions & 0 deletions docs/core/runtime-config/threading.md
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Expand Up @@ -31,6 +31,17 @@ This article details the settings you can use to configure threading in .NET.
| **runtimeconfig.json** | N/A | N/A |
| **Environment variable** | `COMPlus_Thread_AssignCpuGroups` or `DOTNET_Thread_AssignCpuGroups` | `0` - disabled<br/>`1` - enabled |

## Set the stack size for threads created by the .NET runtime

- The default stack size is dictated by .NET and OS policies. The default stack size for .NET apps is 1.5 MB on Windows and macOS, and 8 MB on Linux. The default stack size when .NET runtime is hosted (for example, COM components) is dictated by the hosting process.
- This setting allows overriding the default for threads created by .NET runtime. For example, threads created by the <xref:System.Threading.Thread.%23ctor*> API.
- The specified size should be between 64 kB and 2 GB and a multiple of the natural allocation granularity of the OS.
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@jkotas jkotas Jul 25, 2025

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a multiple of the natural allocation granularity of the OS

Can we align the size up in the implementation so that this does not need to be documented? I think it is only a problem on Windows. This should behave just like the stackSize argument for System.Threading.Thread constructor where we do the same.

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@jkotas jkotas Aug 15, 2025

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Suggested change
- The specified size should be between 64 kB and 2 GB and a multiple of the natural allocation granularity of the OS.
- The specified size should be between 64 kB and 2 GB.


| | Setting name | Values | Version introduced |
| - | - | - | - |
| **runtimeconfig.json** | `System.Threading.DefaultStackSize` | A decimal integer that specifies the size of stack | .NET 10 |
| **Environment variable** | `DOTNET_Thread_DefaultStackSize` | A hexadecimal integer that specifies the size of stack | .NET 10 |

## Minimum threads

- Specifies the minimum number of threads for the worker thread pool.
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