Building Linux cluster for mechanical engineering software Post: 302920299

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Special Forums UNIX and Linux Applications High Performance Computing Building Linux cluster for mechanical engineering software Post 302920299 by DGPickett on Wednesday 8th of October 2014 03:18:17 PM

10-08-2014

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VNC on XWindows platforms creates a local virtual XWindow desktop that supports your choice of window managers, has low latency and can be viewed by a phelora of platform supporting viewers off your client machine of choice. I am using a JAVA viewer, as I lack local admin. The X tcp or unix sockets run inside the host for min laatency (unless you point off-host X clients to it), and a VNC socket connects the viewer. You can run the VNC tcp though an ssh tunnel for security.

Heterogenous clustering requires smarter load balancing and code compatability or porting. Java is portable, compared to C++/g++, which produces code specific to the CPU and O/S, but still is very widely available to compile locally compatible code.

VM makes sense. In practice, very few modern systems page much, and it makes the environment that much more robust. It can support huge sparse matrixes in an mmap()'d space, key to many problems.

Going highly parallel on cpu and ram suggest that net and file access will become bottlenecks, so yes, you need to put lots of work into making them as parallel as possible, too. Network fabric needs to be many path switches and high bandwidth. If you go fiber with either, remember that with its higher speeds comes higher latency, so problems may need to be structured to avoid that. Net and file have been becoming the same problem, as more and more file is remote from the host.

DGPickett

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LEARN ABOUT LINUX

pam_issue

PAM_ISSUE(8)							 Linux-PAM Manual						      PAM_ISSUE(8)

NAME

       pam_issue - PAM module to add issue file to user prompt

SYNOPSIS

       pam_issue.so [noesc] [issue=issue-file-name]

DESCRIPTION

       pam_issue is a PAM module to prepend an issue file to the username prompt. It also by default parses escape codes in the issue file similar
       to some common getty's (using x format).

       Recognized escapes:

       d
	   current day

       l
	   name of this tty

       m
	   machine architecture (uname -m)

       

	   machine's network node hostname (uname -n)

       o
	   domain name of this system

       
	   release number of operating system (uname -r)

       	
	   current time

       s
	   operating system name (uname -s)

       u
	   number of users currently logged in

       U
	   same as u except it is suffixed with "user" or "users" (eg. "1 user" or "10 users")

       v
	   operating system version and build date (uname -v)

OPTIONS

       noesc
	   Turns off escape code parsing.

       issue=issue-file-name
	   The file to output if not using the default.

MODULE TYPES PROVIDED

       Only the auth module type is provided.

RETURN VALUES

       PAM_BUF_ERR
	   Memory buffer error.

       PAM_IGNORE
	   The prompt was already changed.

       PAM_SERVICE_ERR
	   A service module error occurred.

       PAM_SUCCESS
	   The new prompt was set successfully.

EXAMPLES

       Add the following line to /etc/pam.d/login to set the user specific issue at login:

		   auth optional pam_issue.so issue=/etc/issue

SEE ALSO

       pam.conf(5), pam.d(5), pam(7)

AUTHOR

       pam_issue was written by Ben Collins <bcollins@debian.org>.

Linux-PAM Manual						    06/04/2011							      PAM_ISSUE(8)