Hi Christina,
With our latest releases 2.8.*, PVFS has generic hint fields that can
be passed through from end-to-end. All of the PVFS system interface
calls on the client now take a PVFS_hint parameter. This can actually
be a list of hints. Once a hint is passed into a PVFS_sys_* call, it
will be handed around to the different components that take part in
that call, including being sent around to the servers.
To construct pre-defined hints or create your own, have a look at
include/pvfs2-hint.h. The pre-defined hints are listed at the top
of that file. You can define a bunch of hints easily by doing
something like:
int myid = 100;
PVFS_hint ph = PVFS_HINT_NULL;
PVFS_hint_add(
&ph,
"me.hints.myhint",
sizeof(myid),
&myid);
Other hints you define can be added to the same ph variable in the
same fashion. Once you have the hints you want, you can just pass
that ph variable to the PVFS_sys_* calls.
To access the hints you've added within PVFS, have a look at src/
common/misc/pint-hint.h. Especially PINT_hint_get_value_by_name.
That should get you started.
-sam
On Mar 3, 2009, at 9:18 PM, Christina Patrick wrote:
Hi Everybody,
I have some questions to ask regarding the implementation of hints
in PVFS2.
Like the file "src/mpi/romio/adio/include/adioi.h" in the mpich2 src
tree, is there any similar file in the pvfs2 src tree which has a hint
structure. Basically, I want to know if there is any generic hint
structure in pvfs2 which can take care of (accept) hints passed by
higher layers such as MPI, and if so, which files? (whether pvfs2 acts
on it or not does not matter) I want to know if such an infrastructure
exists already?
I was just browsing through the pvfs2 code and I found that there is
some PINT_hint_info structure. Is this a generic hint structure or is
this related to some specific component in pvfs2? (I understand that
there are more than one hint structures in pvfs2 such as related to
metadata)
Is there any documenation on hints in pvfs2 (docs, papers) where I
could read about it? I am not familiar with the pvfs2 src code and
would really appreciate all the help that I could get from you'll.
Thanks and Regards,
Christina.
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