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Old 01-01-2004, 11:34 AM   #1
kublador
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openmosix clustering done, what should i do next after the setting up openmosix?


openmosix clustering done, what should i do next after the setting up openmosix?
i have two computers with redhat9 and openmosix kernel... its setup properly, i know it is because both machines says: this is openmosix cluster node 1 or node 2, something like that when i try to: service openmosix status

what should i do now? how can i do load balancing? does it mean that when i execute mozilla, it should load faster? can someone help me here thank you very much and happy new year!
 
Old 01-01-2004, 03:48 PM   #2
bdp
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somewhere in the openMosix docs you'll find this script:

for x in 1 2 3 4
do
awk 'BEGIN {for(i=0;i<10000;i++)for(j=0;j<10000;j++);}' &
done

to see openMosix in action, get openMosixview working and watch the newly patched kernel attempt to load balance the 4 processes started by the given awk script. if you are referring to cpu load balancing, openMosix attempts to do this autonomously by characterizing each system with a composite metric used by the built-in process migration optimization algorithm.

regarding starting mozilla faster, it's not likely since network limits and other sources of overhead probably exceed typical mozilla start times. however you can migrate the mozilla pid to a faster cpu, and if the cpu performance exceeds overhead constraints you may experience better mozilla performance.

an ideal use for this type of clustering is to process a large number of data processing jobs, each of which demands a large fraction of CPU for an appreciable length of time. examples include finding finite difference solutions of PDE's (i'd say this is its primary use) or perhaps converting vobs to mpg if you're into that. however note that no job can be larger than a memory space of a single machine; this is the primary disadvantage of openMosix. this issue is circumvented by using LAM/MPI, a completely different type of clustering but it has the disadvantage of requiring custom code for utilization. thus openMosix is probably preferred by home users eager to link their CPU's together and scientists that generate many small problems, whereas LAM/MPI is choice for scientists running custom code that spreads a single, large PDE across multiple boxes. i've observed that skills with the latter are more useful in industry.

Last edited by bdp; 01-01-2004 at 04:14 PM.
 
Old 01-01-2004, 04:03 PM   #3
bdp
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here's a concise intro openMosix that includes some simple test demonstrations:
http://www.samag.com/documents/s=881...313a/0313a.htm
openMosixview is essentially a front end to the control commands it details.
 
Old 01-01-2004, 09:25 PM   #4
kublador
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excellent! thank you very very much! happy new year!
 
  


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