I'm starting to look at Racket concurrency functions (futures and places) to increase the efficiency of my application and I have a few questions. Its an OCR application so that once I've segmented the text and created a data-structure to describe the text, the processing can be done concurrently at either higher or lower levels. I.e. I can process pages of a book concurrently, or I can process the pages sequentially and process lines on a page concurrently or again I can process lines sequentially but process letters concurrently.
So my questions are: 1) Since there is no communication between my concurrent processes other than combining the results does it make more sense to use places rather than futures. 2) Is it better to do the concurrency at the highest level possible or at the lowest level possible. I.e. should I be processing pages concurrently or should I go to a much lower level and only be processing letters concurrently. Does it matter? 3) How does hyperthreading affect the number of places or futures I can run concurrently? For example if I have an i7 with 4 cores and hyperthreading, will that run 4 or 8 places concurrently? 4) Are there any "gotcha's" I need to look out for? Thanks, Harry ____________________ Racket Users list: http://lists.racket-lang.org/users
