Hi Tim, Thank you so much for your advice! Finally the problem is solved, and my eyes are filled with tears T T.
Can I really get a pink elephant? Again, thank you! Yijing > On Dec 1, 2014, at 9:08 PM, Tim Holy <[email protected]> wrote: > > John is right that if you change to > > B=fill!(Array(Vector{Int},5,5),Int64[]) > > then you don't see the weird allocations. (Note: you probably really want > > B = Vector{Int}[Int[] for i = 1:5, j = 1:5] > > so each element of B is independent.) > > > Still, this one should win some kind of prize for "strangest allocation > result > of 2014." Where would you like your plastic pink elephant mailed to :-)? > > --Tim > > On Monday, December 01, 2014 06:45:33 PM Yijing Wu wrote: >> Sorry it seems that I simplified my problem too much in the previous code. >> Actually I am running something similar to the following, and I run it as a >> function and it starts to have allocation since i=512. I am really unsure >> if it's my coding problem(so it can be improved to 0 bytes) or it is >> natural in the system that allocations appear. Thank you so much! >> >> function test() >> >> B=fill!(cell(5,5),Int64[]) >> >> >> for i=1:513 >> >> push!(B[2,3],i) >> >> end >> >> >> T=zeros(Int64,513) >> >> >> for i=1:513 >> >> @time T[i]=B[2,3][i] >> >> println(T[i]) >> >> end >> >> end >> >> >> >> 在 2014年12月1日星期一UTC-6下午7时24分31秒，John Myles White写道： >> >>> Did you run this inside a function? If not, your results are not going to >>> be useful indicators of how code will perform inside a function. >>> >>> Inside of a function body, I see 0 bytes being allocated. >>> >>> -- John >>> >>> On Dec 1, 2014, at 4:53 PM, Yijing Wu <[email protected] >>> <http://gmail.com/> <javascript:>> >>> wrote: >>> >>> Hi all, I found a strange problem about a very simple code in julia and >>> hopefully I can get some help from you, here is the code: >>> >>> >>> B=[1:1000] >>> >>> T=zeros(Int64,1000) >>> >>> for i=1:1000 >>> >>> @time T[i]=B[i] >>> >>> println(T[i]) >>> >>> end >>> >>> >>> And when I run the code, the @time shows that it require 48 bytes >>> allocation when i is larger than or equal to 512, and 0 bytes when >>> smaller. Is this a problem that can be improved or I have to accept that >>> it is designed to take some allocations when larger than 512? >>> >>> >>> Thanks a lot for your help!
