Thank you again, Dahua! I hope it can be changed easy. Best,
Charles On Sat, Jun 21, 2014 at 1:06 AM, Dahua Lin <linda...@gmail.com> wrote: > I have looked the codes of cumsum and friends. They are still using > old-style slice-based implementation, instead of the new cache friendly > ways (the way we are implementing reduction). > > Not sure how quickly these will be resolved. If this is not addressed in 2 > - 3 weeks, I may take a shot to reimplement them. > > Dahua > > > On Friday, June 20, 2014 5:53:44 PM UTC-5, Charles Santana wrote: > >> Hi again, >> >> Just to let you know about the issue I just opened in Github: >> >> https://github.com/JuliaLang/julia/issues/7342 >> >> Thank you for everything! >> >> Best, >> >> Charles >> >> >> On Fri, Jun 20, 2014 at 10:07 PM, Charles Novaes de Santana < >> charles...@gmail.com> wrote: >> >>> Thank you, Dahua! >>> >>> I will open an issue in Github as suggested by you. In meanwhile I will >>> see if by using sum I can get a better performance. >>> >>> Best, >>> >>> Charles >>> >>> >>> On Fri, Jun 20, 2014 at 5:54 PM, Dahua Lin <lind...@gmail.com> wrote: >>> >>>> The cumsum / cummax / cummin / cumprod, etc have suboptimal performance >>>> currently, which are about 20x slower than the sum/prod etc (which we spent >>>> a lot of efforts to optimize and tune). >>>> >>>> Please open an issue in Github, and we will try to address this problem >>>> later. >>>> >>>> Dahua >>>> >>>> >>>> On Friday, June 20, 2014 10:15:55 AM UTC-5, Charles Santana wrote: >>>>> >>>>> Dear Julia users, >>>>> >>>>> First of all, Congratulations for this amazing community and for this >>>>> impressive language! I used to program in C++ and in R, I started to >>>>> program with Julia 3 months ago and it has changed my life for better!! >>>>> Thank you!! >>>>> >>>>> By checking the profile of a program we are developing we noted that >>>>> the "bottleneck" seems to be in a cumulative sum along a dimension in a >>>>> matrix, for what we use the function cumsum. >>>>> >>>>> We are doing something like this: >>>>> >>>>> DI = rand(5,5); >>>>> Dc = cumsum(DI,2); >>>>> >>>>> Just to try to clarify what we are doing: Imagine that Matrix DI(i,j) >>>>> represents the probability of an individual to move from a site i to a >>>>> site >>>>> j. We use Dc to determine to which site an individual in site i will move, >>>>> by generating a random number between 0 and maximum(Dc[i,:]). That means, >>>>> we are trying to perform a Multinomial Distribution. >>>>> >>>>> Do you know an alternative to cumsum or do you indicate a good way to >>>>> use this function. >>>>> >>>>> Thanks in advance for any help! >>>>> >>>>> Best regards, >>>>> >>>>> Charles Novaes de Santana >>>>> -- >>>>> Um axé! :) >>>>> >>>>> -- >>>>> Charles Novaes de Santana, PhD >>>>> http://www.imedea.uib-csic.es/~charles >>>>> >>>> >>> >>> >>> -- >>> Um axé! :) >>> >>> -- >>> Charles Novaes de Santana, PhD >>> http://www.imedea.uib-csic.es/~charles >>> >> >> >> >> -- >> Um axé! :) >> >> -- >> Charles Novaes de Santana, PhD >> http://www.imedea.uib-csic.es/~charles >> > -- Um axé! :) -- Charles Novaes de Santana, PhD http://www.imedea.uib-csic.es/~charles
