--- /dev/null
+# Copyright (c) 2010-2022. The SimGrid Team. All rights reserved.
+#
+# This program is free software; you can redistribute it and/or modify it
+# under the terms of the license (GNU LGPL) which comes with this package.
+
+from simgrid import Actor, Comm, Engine, Host, Mailbox, Link, this_actor
+import sys
+
+# This example demonstrates how to attach a profile to a host or a link, to specify external changes to the resource speed.
+# The first way to do so is to use a file in the XML, while the second is to use the programmatic interface.
+
+def watcher():
+ jupiter = Host.by_name("Jupiter")
+ fafard = Host.by_name("Fafard")
+ lilibeth = Host.by_name("Lilibeth")
+ link1 = Link.by_name("1")
+ link2 = Link.by_name("2")
+
+ (links, lat) = jupiter.route_to(fafard)
+ path = ""
+ for l in links:
+ path += ("" if len(path)==0 else ", ") + "link '" + l.name + "'"
+ this_actor.info(f"Path from Jupiter to Fafard: {path} (latency: {lat:.6f}s).")
+
+ for i in range(10):
+ this_actor.info("Fafard: %.0fMflops, Jupiter: %4.0fMflops, Lilibeth: %3.1fMflops, Link1: (%.2fMB/s %.0fms), Link2: (%.2fMB/s %.0fms)" % (
+ fafard.speed * fafard.available_speed / 1000000,
+ jupiter.speed * jupiter.available_speed / 1000000,
+ lilibeth.speed * lilibeth.available_speed / 1000000,
+ link1.bandwidth / 1000, link1.latency * 1000,
+ link2.bandwidth / 1000, link2.latency * 1000))
+ this_actor.sleep_for(1)
+
+if __name__ == '__main__':
+ e = Engine(sys.argv)
+ # Load the platform description
+ e.load_platform(sys.argv[1])
+
+ # Add a new host programmatically, and attach a simple speed profile to it (alternate between full and half speed every two seconds
+ lili = e.get_netzone_root().create_host("Lilibeth", 25e6)
+ lili.set_speed_profile("""
+0 1.0
+2 0.5
+""", 2)
+ lili.seal()
+
+ # Add a watcher of the changes
+ Actor.create("watcher", Host.by_name("Fafard"), watcher)
+
+ e.run()
