Changes between Version 24 and Version 25 of UsersGuide

Timestamp:

Oct 24, 2012 5:35:36 PM (12 years ago)

Author:

Ted Faber

Comment:

--

UsersGuide

@@ -429 +429 @@
 The output shows the topology with boxes drawn around the containers that share a physical node:
 
-
+[[Image(example6-smaller.png)]]
+
+That partitioning is surprising in that {{{lan-1}}} is split into 3 partitions of 6 & 7 nodes rather than 2 parititons of 10.  Similarly {{{lan-2}}} is split into 5 groups of 4 rather than 4 groups of 5.  The packing system is built on the [http://glaros.dtc.umn.edu/gkhome/metis/metis/overview metis] graph paritioning software.  Metis takes a graph and a number of partitions and finds the most balanced partitioning that has roughly equal node counts in each partition as well as low inter-partition communication costs.  The containers system calls metis with increasing numbers of paritions until a partitioning is found that meets the packing factor limits.
+
+When the system attempts to pack {{{lan-1}}} into 2 partitions, metis balances the node counts and the communications costs to produce a partition with 9 containers in one machine and 11 on the other.  That partitioning does not meet the 10 node limit, so it tries again with 3 partitions and succeeds.
+
+There are two ways to fit our topology onto fewer nodes.  The first is to put slightly more slop into the packing factors:
+
+
+|| __Pass__ || __Packing Factor__ ||
+|| 0 || 1||
+|| 1 || 20 ||
+|| 2 || 11 ||
+|| 3 || 6 ||
+
+{{{
+users:~$ /share/containers/containerize.py --pass-pack 0:1,1:20,2:11,3:6 DeterTest example6 ~/example6.tcl 
+Containerized experiment DeterTest/example6 successfully created!
+Access it via http://www.isi.deterlab.net//showexp.php3?pid=DeterTest&eid=example6
+}}}
 
 == Further Reading ==