Github user Ishiihara commented on the pull request:
https://github.com/apache/spark/pull/1871#issuecomment-51724432
@mengxr Some benchmark result
Environment: OSX 10.9, 8G memory, 2.5G i5 CPU, 4 threads
startingAlpha = 0.0025
vecterSize = 100
Driver memory 2g
syn0 and syn1 as mutable.HashMap
| numPartition | numIteration | time | total shuffle write |
| ---------------- | -----------------
|-----------|-----------------------|
|1 |1 | 9m30.828s |42.6MB |
|4 |1 | 5m47.192s |43.6MB |
|10 |1 | 6m12.333s |490.4MB|
|100 |1 | 6m24.663s |2.0G|
syn0 and syn1 as big Array
| numPartition | numIteration | time | total shuffle write |
| ---------------- | -----------------
|-----------|-----------------------|
|1 |1 | 9m1.675s |42.6MB |
|4 |1 | 5m3.130s |43.6MB |
|10 |1 | 5m24.283s |580MB|
|100 |1 | 5m52.446s | 4.1G|
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