[libfabric-users] Minimum size/alignment of RMA

[Biddiscombe, John A.]

I have a strange bug that goes away if I rma a buffer of 128 bytes, but appears to be causing a memory corruption with 64/32/16/8/4 bytes


If I RMA get a buffer of 4 bytes - and my receive buffer is only 4 bytes - will 4 bytes be fetched, or does the provider actually do a cache line or more (128 would be 2). I can't rule out a bug in my code somewhere, but it looks as though I'm getting more memory than I expect.


After writing the above and before clicking send. I suddenly thought - alignment - I bet memory needs to be aligned properely - otherwise rma transfers will cause corruption. Are there such size/alignment restrictions?


thanks


JB
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openfabrics.org/pipermail/libfabric-users/attachments/20200410/cbb5f362/attachment.htm>