[fa.info-vax] Cluster overhead

iglesias@UCI-ICSA.ARPA (Mike Iglesias) (09/11/85)

Can anyone tell me how much system overhead is incurred when running
in a cluster as opposed to a non-cluster system?  I have a 4mb 780
that is going to be clustered soon and people are starting to ask
me about it.  

Thanks,

Mike Iglesias
University of California, Irvine

lerner@ISI-VAXA.ARPA (Mitchell Lerner) (09/11/85)

Dear Mike:

	Its not as simple as DEC makes it sound in the cluster literature.
Many beings have told me that they have built a clustered system and 
jobs ran actually slower due to a non optimized cluster.  From what I 
understand about clustering (which isnt much), one needs to hone everything
on the cluster to a fine edge inorder to realize any performance gains.
"What the "tweakable" variable are exactly and just how to tweak them
is a job only a "DEC cluster consultant" can tell us", I am told.

Good luck!!!

							Sincerely,

							Mitchell

iglesias@UCI-ICSA.ARPA (Mike Iglesias) (09/12/85)

Thanks for the information.

Mike