Register to reply

Finding Core Number On Queue and LSF

by Soaring Crane
Tags: core, number, queue
Share this thread:
Soaring Crane
#1
Feb9-13, 11:29 AM
P: 484
Iím trying to find out the largest number of cores that can be used on a specific queue in LSF with the bqueues command. Iíve used the option Ėl after reading the manual, but I donít see any information about cores listed. Any suggestions?

Thanks.
Phys.Org News Partner Science news on Phys.org
Security CTO to detail Android Fake ID flaw at Black Hat
Huge waves measured for first time in Arctic Ocean
Mysterious molecules in space
AlephZero
#2
Feb9-13, 02:54 PM
Engineering
Sci Advisor
HW Helper
Thanks
P: 6,957
It's a while since I used LSF, but IIRC, LSF works with more general concepts than "number of cores". Remember one LSF job queue might be starting jobs on several different computers with different hardware specifications, and also one LSF job might be running in parallel on several computers (not just several cores of one computer).

LSF has the concept of the number of "processors" that a each computer has, and the number of "processor slots" that each job requests. It's up to the humans who configure LSF how to map those onto the actual hardware available. For example the number of "processors" might be used as measure of different CPU speeds on different single-processor computers, not necessarily the number of physical cores.

IIRC LSF doesn't know anything about how a job uses multiprocessinig or multi-threading once it is running. If you want to control that (e.g. run four job streams with 4, 2, 1, 1 cores available on a single 8-core machine) either you have to trust your users not to abuse the system, or you write shell scripts to set the approporiate environment variables or whatever, to tell and/or enforce what resources a program can use when it runs. That still means trusting the software developers to do it right - and of course the users and developers may be the same people, in sone situations.


Register to reply

Related Discussions
How to creaate a priority queue using print queue Engineering, Comp Sci, & Technology Homework 6
Finding the force of a magnetic field using an air core solenoid Introductory Physics Homework 0
How to Calculate the Number of Turns of Wire needed on a Iron Core Magnetic Solenoid General Physics 3
New Finding: Light element layer in Earth's outer core Earth 0
Number of Coreís vs CPU Hz Speed. What give fastest and most efficient rendering Computing & Technology 5