Coda File System

Re: RVM_ENOT_MAPPED with 1GB RVM at startup

From: Jan Harkes <>
Date: Sat, 19 Jul 2003 12:06:13 -0400
On Fri, Jul 18, 2003 at 10:21:04AM -0700, Tim Hasson wrote:
> Ok, so if I really wanted to store 16 million files, that would be 16,000,000 
> * 500 = 7.5GB (plus 3000b * num.of.dirs)
> Is that even possible? I understand I cannot make a RVM partition larger than 
> ~ 1.7GB, so what if I made a RVM file 10GB large. Would that be pushing it 
> beyond the point of failure?

RVM is completely read into allocated memory (anonymous mmap) or uses a
private mmap of the whole file. Because a 32-bit CPU only has 4GB of
addressable space, and large parts of this space are already taken up by
reserved kernel space, shared libraries, multiple thread stacks and the
malloc heap.

So no, 10GB will definitely never work on a 32-bit CPU. Perhaps it would
be possible on a 64-bit CPU, but a lot of code won't compile correctly
on a 64-bit system (a lot of this results from rpc2_integers which are
defined as long int instead of int32_t).

Received on 2003-07-19 12:09:03