Futures will let you share data, but you'd have to try to avoid allocation in the futures (not completely, just mostly) for good performance (so you'd probably want to build vectors to save the results into). For places, you cannot share the database, you'd have to send if over a place channel to be able to use it in multiple cores at once.
It is hard to say which is going to be better for your task; probably futures will be easier to try, so you might start there. They are more limited, tho, so you might end up switching to places. Have you read the section on performance in the Guide? That provides an overview that you might find helpful. Robby 2011/9/30 Ivanyi Peter <piva...@freemail.hu>: > Hi All, > > I would like to ask for some advice. > I have a problem in which I have several lists containing some data. These > lists are created by one > "process" and this part should be sequential. Then these lists should be > checked against some > large "database", list or hash table, and as a result some new lists must be > built, which at the end must > be merged. I would like to do this later processing concurrently on several > cores. > I am a little unsure which method to use: futures, places, threads, > processes??? > (I am kind of familiar with parallel programming in C and MPI, but not this > fine grained level.) > > I am not sure a couple of things here: > - how to "distribute" the several lists to the "processes" ? (I do not want > to use files for this) Is it possible? > - how to merge the resulting lists at the end? Is it possible? > - how to share, if it is possible at all, the common "database", list or > hash table? If this is not really > possible, it is not a problem I can "load" it in on each "process". (At > least I hope.) > > Any suggestions? > > Thanks in advance, > > Peter Ivanyi > _________________________________________________ > For list-related administrative tasks: > http://lists.racket-lang.org/listinfo/users > _________________________________________________ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/users
