[Pvfs2-developers] trouble with shared memory regions

[Robert Latham]

On Wed, May 31, 2006 at 02:47:55PM -0500, Robert Latham wrote:
> I don't know a whole lot about shared memory regions.  Can anyone
> suggest what's wrong with the test program, or why it might fail?
> lain does have a tmpfs mounted on /dev/shm, and /dev/shm has the same
> permissions as on other machines. the kernel has SYSV IPC support
> built in. 

Murali pointed out that if you do all these shm commands as root once,
you can then do them as regular users.  I'll add this to the faq:  if
you are running pvfs2-server as a non-root user and get "resource
temporarily unavailable", run as root once, then run as a non-root
user. 

Since I had no problems on my workstation (where I have no root
access), perhaps lain's restrictive permissions on SysV shared memory
is not common?

==rob

-- 
Rob Latham
Mathematics and Computer Science Division    A215 0178 EA2D B059 8CDF
Argonne National Labs, IL USA                B29D F333 664A 4280 315B