I have been using 64 OSG on both linux and windows environment without any issues. For our modeler we had to build 64 bit OSG for Max OSG exporter on his 64 bit machine.
As he had plenty of memory on his machine we were able to export large dataset in a single step which was not possible earlier with his 32 bit machine. ~Aashish On Nov 29, 2007 7:05 PM, Donald Tidrow <[EMAIL PROTECTED]> wrote: > > > Zach Deedler wrote: > > This site explains it all: > > http://en.wikipedia.org/wiki/64-bit > > > > 2^32 = 4GB > > 2^64 = 17,179,869,184GB or 16 exabytes > > (I was wrong before). > > > Actually this depends on whether the CPU you're using can really address > this much memory - I seem to recall that AMD cpu's are limited to 48-bit > physical addresses. > > > Some operating systems reserve portions of process address space for OS > use, > > effectively reducing the total address space available for mapping > memory > > for user programs. For instance, Windows XP DLLs and userland OS > components > > are mapped into each process's address space, leaving only 2 to 3.8 GB > > (depending on the settings) address space available, even if the > computer > > has 4 GB of RAM. This restriction is not present in 64-bit Windows. > > > > Not sure what linux does. But, you can't get past the 4GB ceiling for a > > process on a 32-bit OS. > > Last I checked, Linux allowed 3GB/process of user-addressable memory > running a 32-bit kernel. > > Another advantage that you can get from running in 64-bit mode, at least > with x86-64 cpu's, is the use of twice as many processor registers (all > 64-bits wide). This can sometimes speed up programs if you use the > right optimization flags. > > Don > > > > > -----Original Message----- > > From: [EMAIL PROTECTED] > > [mailto:[EMAIL PROTECTED] On Behalf Of Robert > > Balfour > > Sent: Thursday, November 29, 2007 9:54 AM > > To: OpenSceneGraph Users > > Subject: Re: [osg-users] 64-bit OSG > > > > Gordon Tomlinson wrote: > > > >>Note on 32 bit even though the system may let you get to 3gb of memory > > > > seen > > > >>Your addressable memory space per process will be limited to around > 1.8gb > > > > on > > > >>a 32bit system > >> > > > > > > Why is that? And is that per process, or per thread? > > > > > > Bob. > > -- > "A government that is big enough to give you all you want > is big enough to take it all away." > -- Barry Goldwater > > +----------------------------------------+ > | Don Tidrow | > | Visualization Software Engineer | > | SAIC | > | ph: 703-253-1094 | > +----------------------------------------+ > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >
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