Re: [K12OSN] Mosix and K12ltsp HOWTO

Richard Camp (rcamp@campworld.net)
Sun, 17 Mar 2002 08:34:17 -0800 

On the clients there isn't much to migrate.  The terminal is just a 
linux based X terminal.  Local app support may cloud the issue. 
Although if you are running a local app you prob don't want to migrate 
it anyway.

I don't use the clients as workstations so user poweroff is not an 
issue.  But client crashes or hardware going bad does happen.  Ive seen 
many things happen with processes.  Some have lived and some have died. 
  It will depend on the application.

I was compiling a kernel and lost a node.  Yikes, make hung waiting for 
the process to end.

Compiling a kernel is a great way to show the good and bad side of 
mosix.  Many pieces of the kernel have short compile times and don't get 
migrated.  Other parts get migrated since they run longer.  I run a dual 
PII 266 for my server so it takes almost 2 hours to compile a kernel.  I 
have 3 nodes with celeron 366 CPUs.  My kernel compile time goes to less 
than 20 mins.

 > make modules

changes to

 > make -j6 modules

The server load gets high at times.  But I don't like waiting :)

Richard

James Jensen wrote:

> Thanks for this How-To!  I now see some things that I am missing on my
> LTSP+MOSIX test kit.  I hope to give it a go on Monday and with a little
> luck see some success...
> 
> I notice that client processes do not migrate in your configuration, which I
> am thinking is not going to be a problem in achieving the goal of taking
> some of the workstation load off of the server because all the client PCs
> are really doing is displaying Xwindows anyway, right?
> 
> It would appear to me that an intense application with many threads that
> user A is running on the server might get moved to user B's client PC if
> it's just sitting there idle.  I guess the question remains, what will
> happen to user A if user B does a hard shutdown while user A's application
> is still running.  Will that be the end of the processes that it was running
> for user A?  The question of failover is still an issue for those that want
> to use the LT clients/MOSIX nodes as workstations.  If you've using your
> nodes as workstations in this manner what has been your experience?
> 
> Again, (and I think I speak for all of us interested in LTSP+MOSIX) thank
> you very much Richard for providing this guide.  Can't wait to try it!
> 
> James Jensen
> 
> 




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