On 10/08/2012 17:50, Eberle, Anthony wrote:
Yes, the T4 physical host that the zone is configured on is SPARC. Are
you saying that this is a function of the hardware or would possibly
updating to a newer version of gcc help? I'm actually going to see if I
can build a newer version of gcc anyway just to eliminate that variable.
It is a function of the hardware.
You will likely do better (I do on a T2) with the native compiler
(Solaris Studio) than any version of gcc on Sparc, but things involving
long doubles are going to be slow. However, they are a very small part
of a typical mix of R work (if e.g. what CRAN packages do is typical).
In any case, I would suggest using a recent version of gcc, as R-patched
does not compile with gcc3/g77: we have finally required a more modern
Fortran (and there are C things like inlining that require more C99
compliance than gcc3 has).
I picked the "sd" and "R-Benchmark" tests as I am new to R and
functioning more as an administrator than a modeler or statistical
engineer. I too have seen that some operations do perform better on
certain systems than others. This makes sense as I know different
hardware and CPU's are better at some things than others. However I'm
not familiar enough with R yet to know what the functions are doing
under the hood and which would be more performing on what hardware.
However I will try to check into the specs for the T4 and see if
anything is mentioned about the "long double" or something along these
lines. Thanks.
Anthony
-----Original Message-----
From: r-devel-boun...@r-project.org
[mailto:r-devel-boun...@r-project.org] On Behalf Of Radford Neal
Sent: Friday, August 10, 2012 9:49 AM
To: r-devel@r-project.org
Subject: [Rd] Performance issues with R2.15.1 built from source on
Solaris
Is this a SPARC system? On at least some SPARC systems, the "long
double"
type in C is implemented very slowly in software, and it seems that it
is used for the sums done when calculating standard deviations with
"sd".
Radford Neal
Date: Wed, 8 Aug 2012 18:55:37 -0500
From: "Eberle, Anthony" <ae...@allstate.com>
To: <r-devel@r-project.org>
Subject: [Rd] Performance issues with R2.15.1 built from source on
Solaris?
I have a question about building R (2.15.1) from source on a Solaris
10 64bit virtual server with 2 cores and 16GB memory that is running
on an Oracle T4 server. Based on several tests I have done this
configuration has been several orders of magnitude slower than any
other configuration I've tested.
A simple test of some code to calculate the standard deviation 10000
times (simple code to consume resources) takes on average 121.498
seconds on the Solaris server where the next worst system (Redhat
Linux) takes 1.567 seconds:
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Brian D. Ripley, rip...@stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
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