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yannis ats updated MAHOUT1431:

Description:
Hi all,
i tested mahout 0.8 and 0.9 in mahout emr with a large dataset as input and
i performed kmeans experiments with both versions in amazon EMR.
What i found is that mahout 0.8 is faster than mahout 0.9
in particular i observed that mahout 0.8 is performing less iterations and every iteration
of kmeans is faster than mahout 0.9.Every iteration in mahout 0.8 is twice as fast as that
of 0.9
the hadoop version was 1.0.x and the input of the data was roughly 2 million datapoints with
dimensionality of 1800.
The input parameters in both experiments were exactly the same,modulo the initialization which
was random in both cases and i can understand that this may affect the convergence(the amount
of iterations),but i am baffled by the fact that every iteration takes almost twice the time
in 0.9 vs 0.8
Is this normal?is this expected?
thank you in advance for your time.
was:
Hi all,
i tested mahout 0.8 and 0.9 in mahout emr with a large dataset as input and
i performed kmeans experiments with both versions in amazon EMR.
What i found is that mahout 0.8 is faster than mahout 0.9
in particular i observed that mahout 0.8 is performing less iterations and every iteration
of kmeans is faster than mahout 0.9.Every iteration in mahout 0.8 is twice as fast as that
of 0.9
the hadoop version was 1.0.x and the input of the data was roughly 2 million datapoints with
dimensionality of 1800.
The input parameters in both experiments were exactly the same,modulo the initialization which
was random in both cases and i can understand that this may affect the convergence(the amount
of iterations),but i am buffled by the fact that every iteration takes almost twice the time
in 0.9 vs 0.8
Is this normal?is this expected?
thank you in advance for your time.
> Comparison of Mahout 0.8 vs mahout 0.9 in EMR
> 
>
> Key: MAHOUT1431
> URL: https://issues.apache.org/jira/browse/MAHOUT1431
> Project: Mahout
> Issue Type: Question
> Components: Clustering
> Affects Versions: 0.8, 0.9
> Reporter: yannis ats
> Labels: performance
>
> Hi all,
> i tested mahout 0.8 and 0.9 in mahout emr with a large dataset as input and
> i performed kmeans experiments with both versions in amazon EMR.
> What i found is that mahout 0.8 is faster than mahout 0.9
> in particular i observed that mahout 0.8 is performing less iterations and every iteration
of kmeans is faster than mahout 0.9.Every iteration in mahout 0.8 is twice as fast as that
of 0.9
> the hadoop version was 1.0.x and the input of the data was roughly 2 million datapoints
with dimensionality of 1800.
> The input parameters in both experiments were exactly the same,modulo the initialization
which was random in both cases and i can understand that this may affect the convergence(the
amount of iterations),but i am baffled by the fact that every iteration takes almost twice
the time in 0.9 vs 0.8
> Is this normal?is this expected?
> thank you in advance for your time.

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