openstack/arch-design
Code Issues Proposed changes

Add memory overcommit caution

Browse Source 
Change-Id: I6645f091a3f989a797d787a0f283d7f964c35cc0
This commit is contained in:
Peter Matulis 2022-09-14 10:57:31 -04:00
parent 2d5f4e78e4
commit b3afedda77
1 changed files with 7 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
doc/source/design-compute/design-compute-overcommit.rst
View File

@ -10,6 +10,13 @@ following ratios by default:
* CPU allocation ratio: 16:1
* RAM allocation ratio: 1.5:1
.. caution::
Using a RAM allocation ratio above 1:1 can impact running VMs if all
available memory on the hypervisor is used. If sufficient swap space is not
available the system will have to rely on OOM killer to free space which can
have a detrimental effect on running VMs.
The default CPU allocation ratio of 16:1 means that the scheduler
allocates up to 16 virtual cores per physical core. For example, if a
physical node has 12 cores, the scheduler sees 192 available virtual