From: knohr <just_a_techie200x@...>
Date: 2007-05-08T03:30:12+09:00
Subject: Net::SSH performance question.

I am using Net::SSH to execute scripts on a remote server.  The script
that it executes takes a long time to complete, and dumps allot of
stuff to stdout.  If i allow the script to run as is, this causes ruby
(on the local machine) to eat up massive amounts of cycles, as it
parses the stdout.  Redirecting the stdout to /dev/null on the remote
box will fix the performance issue, but will cause me to lose my SSH
session due to inactivity.

Is there is a way to optimize the following code, (maybe having STDOUT
have a low buffer size)?
keep in mind:
A: i need ssh session to be persistent
B: i cannot modify the settings on the server
C: i really don't want to rewrite the perl script *~2000 lines*
D: i would prefer that the script does not move past the shell.perl
line until the script has completed on the remote box.


Net::SSH.start('foo', :username=>'bar', :password=>'') do |session|
copy_file(session, '/tmp/file')
shell = session.shell.sync
shell.mv ("/tmp/file .")
shell.perl "test"
puts "done"
end