IBM Data Platform Ideas Portal for Customers


This portal is to open public enhancement requests against products and services offered by the IBM Data Platform organization. To view all of your ideas submitted to IBM, create and manage groups of Ideas, or create an idea explicitly set to be either visible by all (public) or visible only to you and IBM (private), use the IBM Unified Ideas Portal (https://ideas.ibm.com).


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Status Submitted
Workspace Spectrum LSF
Components Administration
Created by Guest
Created on Dec 10, 2025

RELATED IDEAS

Request for configuration parameter “HNAME_MAX_NUM” to limit the number of hname conditions in RES_REQ.

In production environment, automated scripts (for example, Synopsys CDPL) generate very long RES_REQ strings with thousands of (hname!='hostX') conditions in the select clause, which has led to mbatchd/mbschd performance degradation and scheduling slowdowns or stalls.

Today, LSF has no built‑in parameter to limit RES_REQ length or the number of hname conditions. Administrators must rely on an esub script that parses the select string, counts hname==/!=, and aborts the job when the count exceeds a threshold.​
This works technically but requires per‑cluster deployment and does not provide a product‑level safeguard.

LSF already provides parameters like ATTR_MAX_NUM to limit the number of host attributes and protect cluster performance. In the same spirit, we would like to request a new configuration parameter as follows:​
Name: HNAME_MAX_NUM
Location: lsf.conf (cluster level) and/or lsb.queues (queue level)
Value: positive integer; 0 or undefined means “no limit”

Expected behavior:
LSF counts all hname== and hname!= conditions in the select section of RES_REQ and rejects submissions that exceed HNAME_MAX_NUM, with a clear error message.
A cluster‑level default may be overridden per queue, so stricter limits can be applied only to specific queues if needed.

Needed By Not sure -- Just thought it was cool

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