[Rd] serialize/unserialize vector improvement

From: Michael Spiegel <michael.m.spiegel_at_gmail.com>
Date: Wed, 28 Sep 2011 15:10:49 -0400

Hi folks,

I've attached a patch to the svn trunk that improves the performance of the serialize/unserialize interface for vector types. The current implementation: a) invokes the R_XDREncode operation for each element of the vector type, and b) uses a switch statement to determine the stream type for each element of the vector type. I've added R_XDREncodeVector/R_XDRDecodeVector functions that accept N elements at a time, and I've reorganized the implementation so that the stream type is not queried once per element.

In the following microbenchmark (below), I've observed performance improvements of about x2.4. In a real benchmark that is using the serialization interface to make MPI calls, I see about a 10% improvement in performance.



input <- matrix(1:100000000, 10000, 10000) output <- serialize(input, NULL)
for(i in 1:10) { print(system.time(serialize(input, NULL))) }
for(i in 1:10) { print(system.time(unserialize(output))) }

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Received on Wed 28 Sep 2011 - 19:37:14 GMT

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