updated changelog

[invirt/packages/invirt-remote.git] / files / usr / sbin / sipb-xen-remote-create

diff --git a/files/usr/sbin/sipb-xen-remote-create b/files/usr/sbin/sipb-xen-remote-create
index 4483ce1..32e875a 100755 (executable)
--- a/files/usr/sbin/sipb-xen-remote-create
+++ b/files/usr/sbin/sipb-xen-remote-create
@@ -1,48 +1,31 @@
 #!/usr/bin/python
+
 """
 Picks a host to "create" (boot) a VM on, and does so.
 
-For now, a very dumb algorithm for which host to boot on:
-the one with fewer machines running.
-
-TODO: load-balance based on something like actual free RAM
+Current load-balancing algorithm: wherever there's more free RAM.
 
 TODO: use a lock to avoid creating the same VM twice in a race
 """
 
-
+from invirt.remote import bcast
 from subprocess import PIPE, Popen, call
 import sys
 import yaml
 
-
 def choose_host():
     # Query each of the hosts.
-    # TODO get `servers` from a real list of all the VM hosts (instead of
-    # hardcoding the list here)
-    servers = ['black-mesa.mit.edu', 'sx-blade-2.mit.edu']
-    pipes = [(server,
-              Popen(['remctl', server, 'remote', 'web', 'info'], stdout=PIPE))
-             for server in servers]
-    outputs = [(s, p.communicate()[0]) for (s, p) in pipes]
-    for (s, p) in pipes:
-        if p.returncode != 0:
-            raise RuntimeError("remctl to host %s returned non-zero exit status %d"
-                               % (s, p.returncode)) 
-    results = [(s, yaml.load(o, yaml.CSafeLoader)) for (s, o) in outputs]
     # XXX will the output of 'xm info' always be parseable YAML?
-
-    return max( (int(o['free_memory']), s) for (s, o) in results )[1]
-
+    results = bcast('info')
+    return max((int(o['free_memory']), s) for (s, o) in results)[1]
 
 def main(argv):
     if len(argv) < 2:
-        print >>sys.stderr, "usage: sipb-xen-remote-create <machine> [<other args...>]"
+        print >> sys.stderr, "usage: sipb-xen-remote-create <machine> [<other args...>]"
         return 2
     machine_name = argv[1]
     args = argv[2:]
 
-
     p = Popen(['/usr/sbin/sipb-xen-remote-proxy-web', 'listvms'], stdout=PIPE)
     output = p.communicate()[0]
     if p.returncode != 0:
@@ -52,11 +35,10 @@ def main(argv):
 
     if machine_name in vms:
         host = vms[machine_name]['host']
-        print >>sys.stderr, ("machine '%s' is already running on host %s"
-                             % (machine_name, host))
+        print >> sys.stderr, ("machine '%s' is already running on host %s"
+                              % (machine_name, host))
         return 1
 
-
     host = choose_host()
     print 'Creating on host %s...' % host
     sys.stdout.flush()