Change the behavior of cpus-per-rank. #1995
Merged
Conversation
This file contains hidden or 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
…against the #slots. However, IBM has pointed out that "slot" is equated to the number of processes allowed to run on each node, and not the number of cpus on the node. This has been a continuing source of confusion, so make the distinction a "hard" one. Each process occupies a "slot". We automatically set #slots = #cpus if nothing else is told to us. If you want to run more procs and slots, you must tell us to allow oversubscription. A process can utilize multiple pe's if that option is given. If you try to bind more than one proc to a given pe, then we will error out unless you tell us to allow overloading.
|
Our of curiosity, if the user passes |
|
I didn't change anything about how the number of pe's is computed, so this shouldn't be impacted. |
|
I haven't checked out and built the change, but I think the description matches what I would expect. Thanks. |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
3 participants
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Outdated suggestions cannot be applied.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.
We previously counted each cpu against the #slots. However, IBM has pointed out that "slot" is equated to the number of processes allowed to run on each node, and not the number of cpus on the node. This has been a continuing source of confusion, so make the distinction a "hard" one.
Each process occupies a "slot". We automatically set #slots = #cpus if nothing else is told to us. If you want to run more procs than slots, you must tell us to allow oversubscription.
A process can utilize multiple pe's if that option is given. If you try to bind more than one proc to a given pe, then we will error out unless you tell us to allow overloading.
@markalle Please see if this matches your expectations.