Re: [Rd] C versions of serialize/unserialize in packages

From: Roger D. Peng <rpeng_at_jhsph.edu>
Date: Thu, 31 Jul 2008 11:17:55 -0400

Hmm...I don't think so. The function I'm talking about loops over a file many times and does a lot of 'seeks'. I think just implementing the loop in C makes it faster. And besides, I see the speedup on Linux, which doesn't have the problem you mention.

-roger

On Thu, Jul 31, 2008 at 10:53 AM, Henrik Bengtsson <hb_at_stat.berkeley.edu> wrote:
> Hi,
>
> On Thu, Jul 31, 2008 at 6:35 AM, Roger D. Peng <rpeng@jhsph.edu> wrote:
>> Are the functions 'R_Unserialize' and 'R_InitFileInPStream' allowed to
>> be used in R packages? I guess I'm just not clear on the implications
>> of this comment in 'Rinternals.h':
>>
>> /* The connection interface is not yet available to packages. To
>> allow limited use of connection pointers this defines the opaque
>> pointer type. */
>>
>> I have a function in the 'filehash' package that unserializes a bunch
>> of objects from a file and it seems to run much faster in C than in R.
>> But I don't want to release something that uses a non-public
>> function/interface.
>
> You say "much faster". Could this be related to what I recently observed:
>
> July 24, 2008 thread '[Rd] serialize() to via temporary file is heaps
> faster than doing it directly (on Windows)' [
> https://stat.ethz.ch/pipermail/r-devel/2008-July/050256.html ].
>
> My $0.02
>
> /Henrik
>
>
>>
>> Thanks,
>> -roger
>> --
>> Roger D. Peng | http://www.biostat.jhsph.edu/~rpeng/
>>
>> ______________________________________________
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>>
>
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-- 
Roger D. Peng | http://www.biostat.jhsph.edu/~rpeng/

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