RE: [Xen-users] Test tools for Xen

[Tim Post <tim.post@xxxxxxxxxxxxxxx>]

On Tue, 2007-02-20 at 08:37 -0800, Kraska, Joe A (US SSA) wrote:
> >I want to know the available automated test tools for xen. 
> >I know one test tool xm-test. Any other availabe tool ?
> 
> 
> Rename the below file to pingpong.py
> 

It is neat :) I did something similar but it was more of a game of hot
potato than ping pong we played locally.

It would be really cool if a bunch of us had one relocation server and
we could join in a global game of hot potato migrating around a small VM
that is doing something precise, such as calculating pi or something
else.

This would have to be nfs / iscsi based and swapless, or everyone would
have to agree on some local semantics to swapoff / swapon (to local
swap) as it migrated. I would say .. swapless, ttylinux based and tiny.

It would also need to have networking re-oriented and restarted each
time, everyone participating would need to set aside a mac for it. I
have the tools to do this easily.

This does absolutely no good other than entertain those of us who would
appreciate such a global game of hot potato :) 

Anyone interested? Could be fun!

Best,
--Tim

> Replace the hosts entries with two ips of xen dom0 hosts.
> 
> Create a dom0 on one of the hosts.
> 
> Run the program on both hosts, by typing "python pingpong.py" from
> the command line.
> 
> It will start migrating them back and forth in a game of ping pong. ☺
> 
> Only a small mutation to the code would randomly pick from hosts to
> migrate to if there were more than two dom0’s.
> 
> Joe
> 
> ----------------------
> 
> import commands
> import string
> import time
> import socket
> 
> destination_host = None
> n_migrations = 0
> 
> hosts = {
>       "10.35.39.39" : None,
>       "10.35.39.40" : None,
>       }
> 
> def main():
> 
>       init_network()
> 
>       while( 1 ):
> 
>               time.sleep(2)
>               maybe_migrate()
> 
> def init_network():
> 
>       global destination_host
> 
>       hostname = socket.gethostname( )        
>       addr = socket.gethostbyname( hostname )
>       del hosts[addr]
>       for key in hosts.keys(): destination_host = key
>       print "this host is %s, destination is %s" % ( addr, destination_host )
> 
> def maybe_migrate():
> 
>       global n_migrations
> 
>       status, output = commands.getstatusoutput ( "xm list" )
> 
>       lines = output.split('\n');
> 
>       if( len(lines) == 2 ):
>               print "nothing to migrate"
> 
>       for line in lines:
> 
>               words = line.split()
> 
>               if ( words[0] == "Name" ) : continue
>               if ( words[0] == "Domain-0" ) : continue
> 
>               print line
> 
>               name = words[0]
>               id = words[1]
>               mem = words[2]
>               vcpus = words[3]
>               state = words[4]
>               time = words[5]
> 
>               if( state == "r-----" or state == "-b----" ):
> 
>                       command = "xm migrate --live %s %s" % ( id, 
> destination_host )
>                       print "%s (migrating) ..." % command
>                       status, output = commands.getstatusoutput ( command )
>                       n_migrations += 1
>                       print "...migrated ( %d migrations total ) " % 
> n_migrations
> 
>               else:
> 
>                       print "non migratable state for: %s %s " % ( id, state )
>                       
> if( __name__ == "__main__" ): main()
> 
> 
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