[R-sig-Debian] R slower after etch->lenny upgrade
Gary Hodges
Gary.Hodges at noaa.gov
Wed Dec 9 15:59:25 CET 2009
Charles Plessy wrote:
> Le Tue, Dec 08, 2009 at 09:06:56AM -0700, Gary Hodges a écrit :
>> Gary Hodges wrote:
>>> Hi. Last week I updated from 32 bit etch to 32 bit lenny on an AMD SMP
>>> machine. I first cloned the system disk to an identical drive, and
>>> updated the cloned drive. I still have the etch install untouched on
>>> the previous drive, which has allowed me to do some testing. After the
>>> update R has slowed down significantly. A user brought this to my
>>> attention, and at this point we have only tested one script (multiple
>>> times, different days).
>
>> Update: We just tried something a little different. My colleague's
>> script writes output to the screen. I suggested writing to pdf files
>> instead and it ran much faster; comparable to the speeds on etch. So at
>> this point I'm guessing this is not a R issue per se, but an issue with
>> graphics.
>
> Dear Gary,
>
> I think that between Etch and Lenny, R switched its default rendering system to
> use the Cairo library, which provides anti-aliasing and other improvements.
> This rendering system is slower than the previous system, Xlib. Maybe you can
> try your comparison using ‘type = "Xlib"’ when you open X11() or png() devices.
>
> Best regards,
Great suggestion. That got the script moving along again.
Cheers,
Gary
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