[R-sig-Geo] MODIS Whittaker Smoothing multicore support

[Forrest Stevens]

Great!  Always glad to help!

Forrest

On Wed, Apr 1, 2015 at 8:38 AM Amit Boshale <amit.boshale at yahoo.com> wrote:

> Hi Forrest, that worked! Thank you so much!
> I was always getting an error that sendCall function was not found, I just
> had to load snow package and everything is fine.
> Thanks!
> Amit
>
>
>
>
>
>
>
>   Forrest Stevens <forrest at ufl.edu> schrieb am 15:26 Dienstag, 31.März
> 2015:
>
>
>
>
> Hi Amit, I can provide you with some help to get smoothing working to
> leverage multiple cores.  This is already baked into the
> whittaker.raster() function of our MODIS package and it makes sense to
> use it since the problem is of the "embarrassingly parallel" variety.
> To leverage multiple cores you can do something like the following:
>
>
> #beginCluster(type="SOCK",exclude="MODIS")
> ##  Alternatively:
> nodes <- 4
> beginCluster(nodes)
> system.time(whittaker.raster(vi=vi, wt=qa, inT=time,
> timeInfo=timeInfo, groupYears=FALSE,
> outDirPath=paste(root_path,"output/",sep="")))
> endCluster()
>
> ##  Where vi, qa, time, timeInfo are all arguments you can learn about
> in the whittaker.raster() documentation.
>
>
> Hope this helps!
>
> Sincerely,
> Forrest
>
>
> On Tue, Mar 31, 2015 at 5:33 AM Amit Boshale via R-sig-Geo
> <r-sig-geo at r-project.org> wrote:
> >
> > Dear Matteo,
> > Are there any plans to enable multicore in Whittaker smoothing function?
> I use your MODIS package on regular basis and multicore calculations would
> make my life easier.
> >
> > Keep up the great work
> > Amit
>
> >        [[alternative HTML version deleted]]
> >
> > _______________________________________________
> > R-sig-Geo mailing list
> > R-sig-Geo at r-project.org
> > https://stat.ethz.ch/mailman/listinfo/r-sig-geo
>
>
>
>

	[[alternative HTML version deleted]]