Interesting result. But still, I feel that the computer should be able to do some inference. This could be at runtime, at compile time or during the development. I think than expecting the user to have the knowledge about how to parallelize an application is too much asking.
I will read Charlotte's work. Alexandre On 29 Apr 2011, at 09:58, Toon Verwaest wrote: > I have a hunch that Stefan is referring to the PhD thesis of Charlotte > Herzeel without giving names. As far as I understood from my discussions with > her (and her talks), it generally doesn't really pay off to automatically > parallelize on branches. You get minimal speedups (1% at best). > > I tend to agree with Stefan / Michael / Guy Steele... Maybe you don't need > much, but the mapreduce style is the minimum requirement to give the language > enough "wiggle room" to automatically parallelize stuff. But it DOES require > you to restructure your application in a slightly more declarative fashion. > > cheers, > Toon > > On 04/29/2011 04:55 PM, Alexandre Bergel wrote: >> Hi Stefan, >> >> I though about your email. I do not understand why automatic parallelization >> is not the way to go. In my opinion, the computer has much more knowledge >> about the programmer about where side effects appear and where to cut or >> split a computation. >> >> Actually, if I want to be provocative, I would say that parallelization >> cannot be effective without being automatic. For a similar reason that the >> compiler will always know better than me how to properly allocate registers. >> >> I feel it would be cheaper for me to buy a faster computer than to learn how >> to program in a multi-core fashion. >> >> Cheers, >> Alexandre >> >> >>>> However, as I understand it, it's entirely up to user to write code >>>> exploiting parallel Process explicitly right ? >>> Sure, you have to do: n times: [ [ 1 expensiveComputation. ] fork ]. >>> >>> I don't belief in holy grails or silver bullets. >>> Automatic parallelization is something nice for the kids, like Santa Clause >>> or the Easter Bunny... >> >> > > -- _,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;: Alexandre Bergel http://www.bergel.eu ^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;._,.;:~^~:;.
