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:
[hidden email]
> [mailto:
[hidden email]] On Behalf Of Radford Neal
> Sent: Friday, August 10, 2012 9:49 AM
> To:
[hidden email]
> 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" <
[hidden email]>
>> To: <
[hidden email]>
>> 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,
[hidden email]
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)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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