431 | | |

| 431 | [[Image(example6-smaller.png)]] |

| 432 | |

| 433 | 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. |

| 434 | |

| 435 | 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. |

| 436 | |

| 437 | There are two ways to fit our topology onto fewer nodes. The first is to put slightly more slop into the packing factors: |

| 438 | |

| 439 | |

| 440 | || __Pass__ || __Packing Factor__ || |

| 441 | || 0 || 1|| |

| 442 | || 1 || 20 || |

| 443 | || 2 || 11 || |

| 444 | || 3 || 6 || |

| 445 | |

| 446 | {{{ |

| 447 | users:~$ /share/containers/containerize.py --pass-pack 0:1,1:20,2:11,3:6 DeterTest example6 ~/example6.tcl |

| 448 | Containerized experiment DeterTest/example6 successfully created! |

| 449 | Access it via http://www.isi.deterlab.net//showexp.php3?pid=DeterTest&eid=example6 |

| 450 | }}} |