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Expand the section on changing thread affinity (#3653)

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* Expand the section on changing thread affinity

* Clarify the methods for configuring allocatable memory settings

* Small correction
This commit is contained in:
Jeffrey Novotny
2024-08-29 09:45:50 -04:00
committed by GitHub
parent a19fe8bb31
commit 66211e27b6
1 changed files with 19 additions and 5 deletions
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24
docs/how-to/system-optimization/mi300a.rst
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@@ -145,15 +145,26 @@ This section describes performance-based settings.
sudo modprobe amdttm pages_limit=134217728 page_pool_size=134217728
sudo modprobe amdgpu
These settings can also be hardcoded in the ``/etc/modprobe.d/amdttm.conf`` file. To use this method,
These settings can also be hardcoded in the ``/etc/modprobe.d/amdttm.conf`` file or specified as boot
parameters.
To use the hardcoded method,
the filesystem must already be set up when the kernel driver is loaded.
Add the following lines to ``/etc/modprobe.d/amdttm.conf``:
To hardcode the settings, add the following lines to ``/etc/modprobe.d/amdttm.conf``:
.. code-block:: shell
options amdttm pages_limit=134217728
options amdttm page_pool_size=134217728
If the filesystem is not already set up when the kernel driver is loaded, then the options
must be specified as boot parameters. To specify the settings
as boot parameters when loading the kernel, use this example as a guideline:
.. code-block:: shell
vmlinux-[...] amdttm.pages_limit=134217728 amdttm.page_pool_size=134217728 [...]
To verify the new settings and confirm the change, use this command:
.. code-block:: shell
@@ -240,10 +251,13 @@ This section describes performance-based settings.
* **Change affinity of ROCm helper threads**
This change prevents internal ROCm threads from having their CPU core affinity mask
Changing the affinity prevents internal ROCm threads from having their CPU core affinity mask
set to all CPU cores available. With this setting, the threads inherit their parent's
CPU core affinity mask. If you have any questions regarding this setting,
contact your MI300A platform vendor. To enable this setting, enter the following command:
CPU core affinity mask. Before adjusting this setting, ensure you thoroughly understand
your system topology and how the application, runtime environment, and batch system
set the thread-to-core affinity. If you have any questions regarding this setting,
contact your MI300A platform vendor or the AMD support team.
To enable this setting, enter the following command:
.. code-block:: shell