On Thu, Jan 17, 2002 at 05:06:07PM -0600, Dan Nelson wrote:
> In the last episode (Jan 17), Jeremy Zawodny said:
> > On Thu, Jan 17, 2002 at 04:37:40PM +0200, Heikki Tuuri wrote:
> > > The maximum process space of Linux x86 is 2 GB, and better play
> > > safe.
> > >
> > > Jeremy, I think some Intel x86 processors support segmented memory
> > > above > 4 GB. Is that supported in Linux?
> > Not sure. Most of what I've heard has always come back to the 2GB
> > limit for a single process. There's probably some discussion of it
> > in the linux-kernel archives.
> You can shift the kernel/userland split point; make it 3gb userland,
> 1gb kernel, but you probably don't want to go any more than that.
> Oracle has used multiple shared memory segments to allow a single
> process to access more than 4GB of memory on a 32-bit machines for
> years. You allocate (say) 10 600MB segments, but only map two in at
> a time. This approach wouldn't work well for Mysql since it's a
> single process. Threads all share the same address space, so all
> the threads would have to agree on which 2 segments to use at any
> point in time.
Well, it's a good thing that affordable 64 bit hardware is on the
Jeremy D. Zawodny, <jzawodn@stripped>
Technical Yahoo - Yahoo Finance
Desk: (408) 349-7878 Fax: (408) 349-5454 Cell: (408) 685-5936
MySQL 3.23.41-max: up 14 days, processed 347,170,435 queries (267/sec. avg)