[PVFS2-developers] last email

[neillm at mcs.anl.gov]

On Wed, Mar 10, 2004 at 08:23:54PM -0600, Rob Ross wrote:
> I realize that was a PVFS1 bug, but it sounded like an interesting case, 
> and Neill was already looking at it, so I thought I would let everyone see 
> what he figured out.

Do we have access to his code (or know what it's doing in more
detail)?  Multi-threaded apps/execution in the general case is not a
problem for pvfs2, as I regularly compile and execute iozone on pvfs2
volumes and test runs using something like:

iozone -t 4 [ use processes ]
and 
iozone -T 4 [ use pthreads ]

[ where '4' is tested most often, but other variations of are tested
occasionally, i.e. '8' ]

And mostly unrelated to that: since we only have mmap read support it
doesn't matter how many people mmap it and access it from the page
cache, no?  Though we can invalidate the page cache as often as we
like at the cost of performance, until I see a case where we need to
do that, I'd rather not (... it *really* kills our performance even in
the simple execution case).

-Neill.