ssh-vs-rsh benchmark result

[Junichi Uekawa <dancer@netfort.gr.jp>]

Hi,

I've tried running ssh and rsh on a local cluster, for your interest.

The experiment was ran on 60 nodes of a idle PC cluster,
each node is a dual-Pentium III 1GHz, memory 512MB,
interconnected with 100BASE-TX connection.


I have timed the following cases:

dsh -a w       3.748  -- running  "rsh w" on all hosts sequentially 
dsh -a -c w     1.170  -- running "rsh w" on all hosts parallelly


dsh -a -rssh w   23.051 -- running "ssh w" on all hosts sequentially
dsh -a -rssh -c w  4.306 -- running "ssh w" on all hosts parallelly


The time is in seconds.
I think it is rather significant.
Starting a job using rsh for 60 nodes takes only 4 seconds,
but running ssh for 60 nodes in sequence takes more than 20 
seconds.



regards,
	junichi

-- 
dancer@debian.org  http://www.netfort.gr.jp/~dancer