George -- any thoughts on this one?
On Feb 11, 2009, at 1:01 AM, Mike Dubman wrote:
Hello guys,
I'm running some experimental tcp btl which implements rdma GET
method and advertises it in its flags of the btl API.
The btl`s send() method returns rc=1 to select fast path for PML.
(this optimization was added in revision 18551 in v1.3)
It seems that in PML/ob1, mca_pml_ob1_send_request_start_rdma()
function does not treat right such combination (btl GET + fastpath
rc>0) and going into deadlock, i.e.
+++ pml_ob1_sendreq.c +670
At this line, sendreq->req_state is 0
+++ pml_ob1_sendreq.c +800
At this line, if btl has GET method and btl`s send() returned
fastpath hint - the call to mca_pml_ob1_rndv_completion_request()
will decrement sendreq->req_state by one, leaving it to -1.
This value of -1 will keep send_request_pml_complete_check() from
completing request on PML level.
The PML logic (in mca_pml_ob1_send_request_start_rdma) for PUT
operation initializes req_state to "2" in pml_ob1_sendreq.c +791,
but leaves req_state to 0 for GET operations.
Please suggest.
Thanks
Mike.
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Jeff Squyres
Cisco Systems
