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From Apache Wiki <wikidi...@apache.org>
Subject [Hama Wiki] Trivial Update of "Architecture" by udanax
Date Fri, 13 Mar 2009 01:53:34 GMT
Dear Wiki user,

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The following page has been changed by udanax:

  The Hadoop/Hbase is designed to efficiently process large data set by connecting many commodity
computers together to work in parallel but, If there's a inter-node communication, the elapsed
run time will be slower with more nodes. Consequently, an "effective" algorithm should avoid
large amounts of communication.
  == Algorithms ==
+ === Dense Matrix-Matrix addition ===
+ ==== The addition of multiple matrices ===
+  * https://issues.apache.org/jira/browse/HAMA-154
  === Dense Matrix-Matrix multiplication ===
  To mutliply two dense matrices A and B, We collect the blocks to 'collectionTable' firstly
using map/reduce. Rows are named as c(i, j) with sequential number ((N^2 * i) + ((j * N) +
k) to avoid duplicated records. Each row has a two sub matrices of a(i, k) and b(k, j) so
that minimized data movement and network cost. Finally, We multiply and sum sequentially.

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