I agree. I'm not completely clear what is being proposed, but it sounds
to me like its more of a hint than a fixed parameter. In any event, I
think we should consider a well-designed PVFS hints mechanism that
allows greater flexibility to be added for experimentation and even
permanent use.
Walt
Rob Ross wrote:
We should think about whether we really want these new parameters to be
optional (and thus *hints*) or mandatory (and thus new parameters), but
I do like the idea of providing a clean way to get extensions into the
calls for research purposes like this.
Rob
Murali Vilayannur wrote:
Hi Julian,
Yes they are, but if we extend the system interface then we could
easily add
another parameter if necessary and pending changes to the system
interfaces
can be done in one modification. Thats why I was asking.
Ok, if you say so :).
I suppose if everybody agrees to this interface change do
send a patch ;)!
Can you tell us what exactly was the problem with the new distribution?
I was thinking that all distributions could benefit from such a
mechanism.
Maybe the metatdata server for that file could be selected on the
same way,
too ?
Within the distribution itself the server names are not available I
guess, so
there has to be some hack code outside. Also, I think due to dynamic
migration etc. it is no good idea to write a distribution which
fixated the
datafiles.
This might be possible and is a another cool way, however we want the
user to
set it for example with MPI_hints before the file is opened and only
to set
it for a single file. For example somehow to use dedicated servers
for this
file of a single file system, this might be used to place the
datafiles on
the same nodes if the client also acts as a server or to place the
datafiles "close" to the client on a dataserver. It seems to be rather
inefficent to change the extended attributes of a directory then
create the
file and change it back.
I am not sure how many people are going to use or require this
feature. I really wish we could come up with something cleaner though.
Perhaps, we can create a new structure like PVFS_hints (that groups all
these extra parameters as they come by) and pass an optional
pointer to that at the time of sys_create, sys_mkdir and sys_symlink()?
thanks,
Murali
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--
Dr. Walter B. Ligon III
Associate Professor
ECE Department
Clemson University
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