freebsd stable - May 2009 - maximum mmap()

Hi,
i found that my rrdtool does not work with mmap() with rra files size
more than 2GB.
my question: on i386 arch,  what's maximum size of file to be able to mmap()
?
do i have to change from i386 to amd64? or added 4GB RAM?

thanks!
-- 
-dikx-

On Wednesday 13 May 2009 7:10:29 am dikshie wrote:
> Hi,
> i found that my rrdtool does not work with mmap() with rra files size
> more than 2GB.
> my question: on i386 arch,  what's maximum size of file to be able to
mmap() ?
> do i have to change from i386 to amd64? or added 4GB RAM?
The amount of RAM is not the issue, it is the size of the virtual address
space.  You can lower maxdsiz on i386 to leave more room for mmap, and you
can also change KVA_PAGES in the kernel to leave more address space for
userland than for the kernel perhaps, but you won't get a whole lot more
space that way (you might be able to map 2.5GB or so).  Moving to amd64 gives
you a 64-bit virtual address space and you will be able to easily mmap()
much, much more than 4GB out of the box.

-- 
John Baldwin

On Wednesday 13 May 2009 06:10:29 am dikshie wrote:
> i found that my rrdtool does not work with mmap() with rra files size
> more than 2GB.
Umm, one of the goals of rrdtool was to create databases with a finite (and 
relatively small) maximum size.  What on earth are you doing with it? :-)
-- 
Kirk Strauser