Re: typesizes and memory usage on 64bit vs. 32bit
On 11/04/12 11:30, Stephan Bergmann wrote:
> as there is no
> process model for x86_64 with 32 bit addresses).
not yet anyway, there is a "x32" ABI under development, support for
which was recently merged into Linux 3.4 (but of course it's entirely
possible that this will never see actual use as it requires re-compiling
everything in user space):
http://lwn.net/Articles/456731/
http://sites.google.com/site/x32abi/
there is already a precendent for this, as for MIPS there is also an ABI
with 32bit pointers and 64bit registers ("N32").
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Re: typesizes and memory usage on 64bit vs. 32bit
On 04/11/2012 11:10 AM, Enrico Weigelt wrote: does anybody has some knowledge about LO's memory usage increase comparing 32 to 64 bit ? (heap data, not code). I've seen a massive memory consumption increase on Chromium since moved from 32bit to 64bit userland. Seems they quite frequently used plain int types which of course gets doubled in size then. "plain int" stays 32 bits in the LP64 model (where only long int and pointers go 64 bits), so the main increase in memory consumption is typically due to the larger pointers. In general, the main motivation to switch an application from 32 to 64 bit on a platform that would support executing either (which is true at least for all the x86/x86_64 based Linux, Mac OS X, Windows) should be a demand for a large number of threads per process (as the need to allocate stack space for them easily conflicts with a small address space; but LO is not in need here, I'd say) or removal of legacy 32 bit versions of libraries from the system (as apparently happens on Mac, e.g. with in-process JVM). Or, esp. on x86/x86_64 architectures, improved application performance due to the larger register set (which needs to be judged against the larger pointer size, as there is no process model for x86_64 with 32 bit addresses). Anyway, the trend apparently is to go 64 bit regardless. Stephan ___ LibreOffice mailing list LibreOffice@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/libreoffice
typesizes and memory usage on 64bit vs. 32bit
Hi folks, does anybody has some knowledge about LO's memory usage increase comparing 32 to 64 bit ? (heap data, not code). I've seen a massive memory consumption increase on Chromium since moved from 32bit to 64bit userland. Seems they quite frequently used plain int types which of course gets doubled in size then. I'm just curious if we've got the same problem in LO. cu -- Mit freundlichen Grüßen / Kind regards Enrico Weigelt VNC - Virtual Network Consult GmbH Development Äußere Bayreuther Str. 55, D - 90409 Nürnberg Tel: +49 911 72303-30 Fax: +49 911 72303-50 enrico.weig...@vnc.biz; www.vnc.de ___ LibreOffice mailing list LibreOffice@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/libreoffice
