On Mon, 2009-03-09 at 17:56 +0000, Bill Crawford wrote: > On Monday 09 March 2009 17:33:19 Matej Cepl wrote: > > On 2009-03-09, 17:00 GMT, Adam Williamson wrote: > > > Running x86-64 basically uses twice as much RAM for any given > > > workload as running x86-32 would. > > > > Sorry, but that's just not true -- the only data types which are > > twice as big on x86_64 than on i386 are pointers and (I believe) > > long int. Every other primitive C type else remains the same in > > size. There was a long discussion of this on fedora-devel (I > > believe) couple of weeks ago. > > ... and with pointers being bigger, there's a higher waste from alignment > restrictions, padding, etc., malloc() internal data structures are bigger, > libraries need more space for writable mappings like the procedure linkage > table, virtual function tables and so on. There's a fair bit extra usage that's > not immediately visible, in other words. Sorry, I may well be wrong on the exact quantity there, I should've said I wasn't 100% definite on that. It's what I'd been told by several people prior to switching, and it more or less matches what I see on this system after switching (700MB vs. 1.3GB in typical use), but I'm absolutely happy to be corrected on the issue :) -- Adam Williamson Fedora QA Community Monkey IRC: adamw | Fedora Talk: adamwill AT fedoraproject DOT org http://www.happyassassin.net -- fedora-test-list mailing list fedora-test-list@xxxxxxxxxx To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-test-list
