[Rd] serialize/unserialize vector improvement

[Michael Spiegel]

Has there been any movement on this patch? It will improve the
serialize/unserialize performance.

Thanks,
--Michael

On Mon, Oct 3, 2011 at 9:28 AM,  <luke-tierney at uiowa.edu> wrote:
> It's on my list to look at but I may not get to it for a couple of
> weeks. Someone else may get there earlier.
>
> Best,
>
> luke
>
>
> On Mon, 3 Oct 2011, Michael Spiegel wrote:
>
>> Any thoughts? I haven't heard any feedback on this patch.
>>
>> Thanks!
>> --Michael
>>
>> On Wed, Sep 28, 2011 at 3:10 PM, Michael Spiegel
>> <michael.m.spiegel at gmail.com> wrote:
>>>
>>> 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.
>>>
>>> Cheers,
>>> --Michael
>>>
>>> microbenchmark:
>>>
>>> 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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>>
>
> --
> Luke Tierney
> Chair, Statistics and Actuarial Science
> Ralph E. Wareham Professor of Mathematical Sciences
> University of Iowa                  Phone:             319-335-3386
> Department of Statistics and        Fax:               319-335-3017
>   Actuarial Science
> 241 Schaeffer Hall                  email:      luke at stat.uiowa.edu
> Iowa City, IA 52242                 WWW:  http://www.stat.uiowa.edu