2 <!DOCTYPE platform SYSTEM "https://simgrid.org/simgrid.dtd">
3 <platform version="4.1">
4 <zone id="world" routing="Full">
5 <!-- this platform models 3 clusters, interconnected over the Internet
7 - This example intends to be somewhat exhaustive, your platform should probably be simpler.
9 - In particular, the clusters are modeled in very different ways,
10 - but you should pick the way you prefer, and stick to it.
13 <!-- Here comes the first cluster, the simplest one.
15 Every nodes are connected through a private link to a router
16 (ie a machine that cannot host computations).
18 node-0.1core.org __[l0]__
20 node-1.1core.org __[l1]__router___(outer world)
22 node-7.1core.org __[l9]_/
24 So the route from node-0 to node-1 is {l0.UP, l1.DOWN}
26 <cluster id="simple" prefix="node-" radical="0-7" suffix=".1core.org" speed="1Gf" bw="125MBps" lat="50us">
27 <prop id="watt_per_state" value="0.0:1.0" />
28 <prop id="watt_off" value="0.0" />
32 <!-- This second cluster has a backbone link, connecting all private links:
33 node-0.2cores.org __[l0]______+
35 node-1.2cores.org __[l1]__[backbone]__ router __ (outer world)
37 node-7.2cores.org __[l7]______+
38 The route from node-0 to node-1 is: l0.UP ; backbone ; l1.DOWN
40 The route from node-0 to the outer world begins with: l0.UP ; backbone
42 <cluster id="backboned" prefix="node-" radical="0-7" suffix=".2cores.org"
44 bw="125MBps" lat="50us"
45 bb_bw="2.25GBps" bb_lat="500us">
46 <prop id="watt_per_state" value="0.0:1.0:2.0" />
47 <prop id="watt_off" value="0.0" />
51 <!-- This cluster has a backbone link, but no links are splitduplex.
52 - It means that up and down communications compete as if they
53 - were using exactly the same resource. If you send and receive
54 - at the same time, then each get half of the bandwidth.
56 - Also, the hosts have 4 cores.
58 <cluster id="halfduplex" prefix="node-" radical="0-7" suffix=".4cores.org" speed="1Gf" core="4"
59 bw="125MBps" lat="50us" sharing_policy="SHARED"
60 bb_bw="2.25GBps" bb_lat="500us" bb_sharing_policy="SHARED">
61 <prop id="watt_per_state" value="0.0:1.0:4.0" />
62 <prop id="watt_off" value="0.0" />
65 <!-- And now, we create the routes between the clusters, ie inter-zone routes -->
67 <!-- We have only one outer link, representing the internet
68 - Its sharing is FATPIPE, meaning that communications have no impact on each others.
69 - Any given comm can use the full provided bandwidth.
71 - This models the big links constituting the backbone of the internet,
72 - that users cannot saturate.
73 - Users' bandwidth is mostly limited by their outgoing connexion,
74 - not by the network backbone.
77 <link id="backbone" bandwidth="1.25GBps" latency="500us" sharing_policy="FATPIPE"/>
79 <zoneRoute src="simple" dst="backboned"
80 gw_src="node-simple_router.1core.org"
81 gw_dst="node-backboned_router.2cores.org">
82 <link_ctn id="backbone" />
85 <zoneRoute src="simple" dst="halfduplex"
86 gw_src="node-simple_router.1core.org"
87 gw_dst="node-halfduplex_router.4cores.org">
88 <link_ctn id="backbone" />
91 <zoneRoute src="backboned" dst="halfduplex"
92 gw_src="node-backboned_router.2cores.org"
93 gw_dst="node-halfduplex_router.4cores.org">
94 <link_ctn id="backbone" />