On Jul 3, 2009, at 1:20 PM, Greg Guerin wrote: > [useful comments excised, thank you very much]
I will try lseek and write at the end. > Exactly what problem is solved by initially writing multiple > gigabytes of zeros to disk? As for what I am doing, I have a parallel Scheme system (Wraith Scheme, see the "Software" page of my web site, URL in the .sig), and I use mmap to obtain a shared Scheme main memory. By "parallel", I mean separate Unix processes, not threads. I am setting things up so that a user who wishes to do so can choose a memory size large enough to drag the application to a screeching halt from swapping, and the way to do that seems to be for one process to create a file of the desired size, then have that process and all the others mmap it. I am not saying that it is wise to choose such a large Scheme main memory, but some users may want to do it. If there is a better way, I would love to hear about it; I am by no means an mmap wizard. -- Jay Reynolds Freeman --------------------- jay_reynolds_free...@mac.com http://web.mac.com/jay_reynolds_freeman (personal web site) _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
