cuda - Required buffer for cuFFT -


this question buffer required cufft. in user guide documented that

in worst case, cufft library allocates space 8*batch*n[0]*..*n[rank-1] cufftcomplex or cufftdoublecomplex elements (where batch denotes number of transforms executed in parallel, rank number of dimensions of input data (see multidimensional transforms) , n[] array of transform dimensions) single , doubleprecision transforms respectively.

what "array of transform dimensions" mean? how buffer cufft need? understand above needs @ least 8x size of array being ffted not make sense me

thanks in advance

daniel

the "array of transform dimensions" array containing problem size in each dimension, see section on multidimensional transforms more information.

cufft allocating temporary space able accommodate intermediate data, part of doc quoted says "the worst case", it's not "at least 8x", it's @ most. doc goes on say:

depending on configuration of plan, less memory may used. in specific cases, temporary space allocations can low 1*batch*n[0]*..*n[rank-1] cufftcomplex or cufftdoublecomplex elements.

so nxm 2d single precision transform:

1*n*m*sizeof(cufftcomplex) <= space tmp data <= 8*n*m*sizeof(cufftcomplex)

Comments

Post a Comment

Popular posts from this blog

Why does Ruby on Rails generate add a blank line to the end of a file? -

running rails generate controller foo home results in: class foocontroller < application controller def home end end (there's nothing on line in actual file, blank line) is there purpose blank line? it's common use newline indicate end of line, last line. many editors (like vi, use) add in newline silently. consensus text files (especially in unix world) should end in newline, , there have been problems historically if wasn't present. why should text files end newline? the tool used count lines in file "wc" counts newlines in file, without trailing newline show 3 instead of 4. it improves readability of templates used in generator. consider: https://github.com/rails/rails/blob/master/railties/lib/rails/generators/rails/controller/templates/controller.rb to remove trailing newline, template have last line of: end<% end -%> instead of: end <% end -%> that seems less readable me. the discussion below refers
Read more

keyboard - Smiles and long press feature in Android -

i've created android keyboard. how add features inserting smilies, , using long keypresses display symbols? to create long-press behavior allows select several options pop-up menu, follow guide (specifically pop-up menu section): http://developer.android.com/guide/topics/ui/menus.html smileys (also known emoticons) combination of keys, understood programs , parsed same way. have do, when clicks smiley face on keyboard, simulate pressing of key combination matching emoticon. example, when clicks smiley, should simulate key presses ':' , ')' :). here's list of emoticons: http://en.wikipedia.org/wiki/list_of_emoticons
Read more

node.js - Bad Request - node js ajax post -

i'm using express 3.0 , node v0.11.0. have button submits form , i'm using ajax post data json object node server. client code is: $('#contact').submit(function(e) { console.log('submit called'); var formdata = json.stringify($('form').serializeobject()); console.log(formdata); $.ajax({ url: "http://localhost:3000/savedata/", type: "post", datatype: 'json', data: {objectdata: formdata}, contenttype: "application/json", complete: function() { console.log('process complete'); }, success: function(data) { console.log('process sucess'); }, error: function() { console.log('process error'); }, }); return false; }); then on server: var express = require('express'); var app = express(); app.set('views', __dirname + '/views'); app.set('view engine', 'jade'); app.use(express.bodyparser());
Read more