But I guarantee you that a smaller form factor devices will appear in short order, and they won't use 64-bit CPUs, because in the beginning they won't have anywhere close to 4GB RAM, so a 64-bit memory bus and MMU will be an overkill for them. And the cycle will repeat... Even in the phones and PCs, many sub-components contain their own 32-bit controllers, and those need to be programmed too. And Rust is aiming for this niche, doesn't it?
I think you are getting dangerously close to the argument that "we don't need to optimize code, because Moore's law will take care of performance" :-) On Wed, Nov 13, 2013 at 3:03 PM, Daniel Micay <danielmi...@gmail.com> wrote: > On Wed, Nov 13, 2013 at 5:51 PM, Bill Myers <bill_my...@outlook.com> > wrote: > > Although, on second thought, one could just free the unused part of the > user > > mode stack whenever a thread blocks, either in the user mode code (i.e. > > using madvise MADV_DONTNEED or equivalent to discard everything below the > > stack pointer modulo the page size, perhaps minus the page size) or > > automatically in a modified kernel, and thus greatly reduce the worst > case. > > > > It's still going to have higher overhead than the CPS continuations on > the > > heap, because the stack will tend to have holes where dead variables > live, > > for aligning to page boundaries, and you also keep around the kernel > stack > > and kernel scheduler objects. > > > > And it doesn't work on 32-bit, because you cannot have more than around > 2048 > > tasks with megabyte-sized task stacks (which is way too low for several > > usages), and unfortunately there are lots of 32-bit-only smartphones and > > tablets that should probably be supported. > > > > We don't need to worry about scaling on existing phones and tablets. > They have short lifetimes, and most of them don't even receive > security updates. The iPhone 5S is already 64-bit and Android vendors > will move too, especially since they traditionally ship a lot more > memory in even mid-level phones. > _______________________________________________ > Rust-dev mailing list > Rust-dev@mozilla.org > https://mail.mozilla.org/listinfo/rust-dev >
_______________________________________________ Rust-dev mailing list Rust-dev@mozilla.org https://mail.mozilla.org/listinfo/rust-dev
