LinuxQuestions.org
Share your knowledge at the LQ Wiki.
Go Back   LinuxQuestions.org > Forums > Linux Forums > Linux - Server
User Name
Password
Linux - Server This forum is for the discussion of Linux Software used in a server related context.

Notices



Reply
 
Search this Thread
Old 07-27-2012, 03:17 AM   #1
iashkan
LQ Newbie
 
Registered: Jun 2011
Location: Tehran, Iran
Distribution: Centos, Debian, Freebsd
Posts: 24

Rep: Reputation: Disabled
Lightbulb Single System Image (SSI) Cluster help request


Hi all

I have a small cluster network (96 cores).
Cluster management software is oracle grid engine.

this cluster is using for MRI analyses with FSL and Freesurfer and of course matlab on all linux nodes.

now I have a simple problem. oge distribute jobs on computers. it means paralleling. but some of analyzes are very heavy for a single core.

I need some thing to simulate my network as a very big computer. I googled and found SSI solutions. OpenMosix and OpenSSI. sadly it openmosix is off.
OpenSSI i don't know.


1- is any alternative solution?
2- Is SSI means at last I have a big CPU? Is run my analyzes faster?
 
Old 07-27-2012, 08:01 PM   #2
syg00
LQ Veteran
 
Registered: Aug 2003
Location: Australia
Distribution: Lots ...
Posts: 12,500

Rep: Reputation: 1077Reputation: 1077Reputation: 1077Reputation: 1077Reputation: 1077Reputation: 1077Reputation: 1077Reputation: 1077
1) I don't know of anything like you seem to be describing.
2) NO. SSI is to give the impression of one large computer (rather than your grid of nodes). Nothing can make your cores "bigger" from a process scheduling perspective. At least not yet - maybe some smart researcher is looking at it ...
 
Old 07-28-2012, 12:17 AM   #3
iashkan
LQ Newbie
 
Registered: Jun 2011
Location: Tehran, Iran
Distribution: Centos, Debian, Freebsd
Posts: 24

Original Poster
Rep: Reputation: Disabled
Quote:
Originally Posted by syg00 View Post
2) NO. SSI is to give the impression of one large computer (rather than your grid of nodes). Nothing can make your cores "bigger" from a process scheduling perspective.
thank you for reply
what do you mean by large computer?
large computer can process faster or means just more ram size?
 
Old 07-28-2012, 12:37 PM   #4
btmiller
Senior Member
 
Registered: May 2004
Location: In the DC 'burbs
Distribution: Arch, Scientific Linux, Debian, Ubuntu
Posts: 4,165

Rep: Reputation: 330Reputation: 330Reputation: 330Reputation: 330
SSI means single system image. Basically it means that all your cores, memory, disk, etc. on the network are under the control of a single OS image, so the whole network looks like one big SMP (symmetric-multiprocessor) machine. In theory this machine can process much faster, but only if the software is written to use multiple cores. A more traditional alternative is to use something like MPI to run your software in parallel. You might want to check if any of the programs that you're using have MPI support. Either way, the speed and latency of the network can dramatically impact performance, as your nodes must communicate heavily over it.
 
  


Reply

Tags
clustering, grid


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
[SOLVED] Converting Windows node cluster to Linux Cent0S 5.5 cluster do I kickstart or image ? cdrolet Linux - Newbie 1 11-18-2011 11:44 AM
Getting a single system cluster installed for 32 bit. Burrild Linux - General 2 07-28-2011 10:17 PM
is it possible to monitor every single dns request from my box deathalele Linux - Networking 1 05-31-2009 06:54 AM
From single server to cluster littlebigman Linux - Server 2 08-25-2008 06:55 AM
now a question about Single-System Image altarazul Linux - Newbie 5 07-27-2008 01:20 AM


All times are GMT -5. The time now is 03:20 AM.

Main Menu
Advertisement
My LQ
Write for LQ
LinuxQuestions.org is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
Syndicate
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
identi.ca: @linuxquestions
Facebook: linuxquestions Google+: linuxquestions
Open Source Consulting | Domain Registration