Building Linux cluster for mechanical engineering software Post: 302918888

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Special Forums UNIX and Linux Applications High Performance Computing Building Linux cluster for mechanical engineering software Post 302918888 by Don Cragun on Friday 26th of September 2014 03:34:02 AM

09-26-2014

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Some of your questions are so vague that it is hard to make any informed suggestions. How would you respond if you got a request from someone to tell them how to choose the best vehicle? (Who is going to be driving it? How many passengers do you need to carry? How much weight do you need to be able to tow? How much secured cargo space do you need? What are the weather conditions where it will be driven? What type of terrain does it need to traverse? ...)

I know very little about about ME and nothing about Ansys CFD. Are you trying to build a cluster to support hundreds of users submitting thousands of jobs? Are you trying to build a cluster than can break a single huge job into thousands of threads and run all of those threads simultaneously? Do you have any experience writing thread-safe code?

Can you use only open-source software? Of course you can! You can write all of the code you need and make it available for everyone to use as they see fit.

Does open-source software already exist for all of the code you want to run? How can we guess at that from what you've told us? We have no idea what all of the code you want to run needs to do.

If you don't know the difference between a heterogeneous cluster and a homogeneous cluster, you probably don't have the background needed to design the cluster you want. Please consider hiring an architect with experience setting up and running an HPC data center who you can sit down with and discuss budget, capabilities, computing projects to be run, users to be supported, software to be run, software to be written, etc., etc., etc. Setting up an HPC data center is a very complex, expensive undertaking.

Don Cragun

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LEARN ABOUT DEBIAN

groupd

GROUPD(8)							      cluster								 GROUPD(8)

NAME

       groupd - compatibility daemon for fenced, dlm_controld and gfs_controld

SYNOPSIS

       groupd [OPTIONS]

DESCRIPTION

       The  groupd  daemon  and  libgroup  library  are used by the fenced, dlm_controld and gfs_controld daemons when they are operating in clus-
       ter2-compatible mode to perform a rolling cluster upgrade from cluster2 to cluster3.

       See cman(5) for more information on the upgrading configuration option needed to perform a rolling upgrade.

       When the upgrading option is enabled, cman adds the following to the online configuration:

	    <group groupd_compat="1"/>

       This setting causes the cman init script to start the groupd daemon, and causes the groupd, fenced, dlm_controld and  gfs_controld  daemons
       to operate in the old cluster2 mode so they will be compatible with cluster2 nodes in the cluster that have not yet been upgraded.

       The  upgrading setting, including the groupd_compat setting, cannot be changed in a running cluster.  The entire cluster must be taken off-
       line to change these because the new cluster3 default modes are not compatible with the old cluster2 modes.  The upgrading/compat  settings
       cause the new cluster3 daemons to run the old cluster2 code and protocols.

OPTIONS

       Command line options override a corresponding setting in cluster.conf.

       -D     Enable debugging to stderr and don't fork.

       -L     Enable debugging to log file.

       -g num groupd compatibility mode, 0 off, 1 on. Default 0.

       -h     Print a help message describing available options, then exit.

       -V     Print program version information, then exit.

SEE ALSO

       cman(5), fenced(8), dlm_controld(8), gfs_controld(8)

cluster 							    2009-01-19								 GROUPD(8)