Re: mmap: Cannot allocate memory?

[Donn Cave <donn@u.washington.edu>]

On Wednesday, April 14, 2004, at 01:34 PM, Quanah Gibson-Mount wrote:
> --On Wednesday, April 14, 2004 1:58 PM -0500 "Armbrust, Daniel C." 
> <Armbrust.Daniel@mayo.edu> wrote:
>
> > > What OS are you using?
> >
> > > --Quanah
> >
> > Redhat 9  on a dual cpu AMD based 32 bit system
>
> Linux has a hard coded 1.9GB upper limit on shared memory segments.  I 
> also have found that BDB itself in a 32 bit linux environment won't 
> let me allocate 2 GBs of cache, disk or otherwise.  One of my goals is 
> to track down where BDB is hard coding that in.  It definitely does 
> not have that limit under Solaris.

We have that limitation on some of our Linux hosts, not on others.
Not on Redhat Enterprise, for example.  I was given to understand
that it's a build parameter to the kernel, which might be set to
different values according to the intended application - a server
platform would get a larger limit.

	Donn Cave, donn@u.washington.edu