R SIG Fedora - Jul 2024 - libdeflate

Since the 4.4.0 release, R can make use of libdeflate. From the release 
notes:

 > memCompress() and memDecompress() will use the libdeflate library 
(https://github.com/ebiggers/libdeflate) if installed. This uses the 
same type of compression for type = "gzip" but is 1.5-2x faster than
the
system libz library on some common platforms: the speed-up may depend on 
the library version.

 >? If the libdeflate library and headers are available, libdeflate 
rather than libz is used to (de)compress R objects in lazy-load 
databases. Typically tasks spend up to 5% of their time on such 
operations, although creating lazy-data databases is one of the exceptions.
 > This can be suppressed if the library is available by the configure 
option --without-libdeflate-compression.

Would it be worth taking advantage of this in the Fedora build?

Tim

Thanks, good catch. R has been rebuilt with support for libdeflate and will
be available soon as an update.

I?aki

On Thu, 4 Jul 2024 at 08:43, Tim Taylor <tim.taylor at
hiddenelephants.co.uk>
wrote:
> Since the 4.4.0 release, R can make use of libdeflate. From the release
> notes:
>
>  > memCompress() and memDecompress() will use the libdeflate library
> (https://github.com/ebiggers/libdeflate) if installed. This uses the
> same type of compression for type = "gzip" but is 1.5-2x faster
than the
> system libz library on some common platforms: the speed-up may depend on
> the library version.
>
>  >  If the libdeflate library and headers are available, libdeflate
> rather than libz is used to (de)compress R objects in lazy-load
> databases. Typically tasks spend up to 5% of their time on such
> operations, although creating lazy-data databases is one of the exceptions.
>  > This can be suppressed if the library is available by the configure
> option --without-libdeflate-compression.
>
> Would it be worth taking advantage of this in the Fedora build?
>
> Tim
>
> _______________________________________________
> R-SIG-Fedora mailing list
> R-SIG-Fedora at r-project.org
> https://stat.ethz.ch/mailman/listinfo/r-sig-fedora
>

-- 
I?aki ?car

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