Ticket 13173

Summary:	MaxArraySize
Product:	Slurm	Reporter:	Thu-Ha Tran <thu-ha.tran>
Component:	Configuration	Assignee:	Scott Hilton <scott>
Status:	RESOLVED INFOGIVEN	QA Contact:
Severity:	4 - Minor Issue
Priority:	---
Version:	21.08.4
Hardware:	Linux
OS:	Linux
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Description Thu-Ha Tran 2022-01-11 12:41:45 MST

Hi Support,

We have specified 
MaxArraySize            = 1000

But when we submitted an array job which 1000 elements, it failed (Invalid job array specification) but it works which 999 elements.

Same with MaxCPUsPerNode that I have reported before and it is now fixed in slurm 21.08. 

To keep a specified number of elements working, I had to add 1. 

Would you please take a look?

Regards,
Thu-Ha

Comment 1 Scott Hilton 2022-01-12 09:43:40 MST

Thu-Ha,

MaxArraySize not only limits the number of elements the the max index of the elements. 

With "MaxArraySize = 1000", the only way to have 1000 elements is to use 0-999, 1-1000 will not work because 1000 is not a vaild index.

This is in our documentation: https://slurm.schedmd.com/job_array.html#overview
Note that the minimum index value is zero and the maximum value is a Slurm configuration parameter (MaxArraySize minus one)

-Scott

Comment 2 Thu-Ha Tran 2022-01-12 12:58:46 MST

Hi Scott,

So the largest array element should not be greater than "MaxArraySize -1", right?
Thanks for verification.


Regards,
Thu-Ha

Comment 3 Scott Hilton 2022-01-12 13:50:52 MST

Thu-Ha,

That is correct.

Closing ticket.

-Scott