[libfabric-users] CQ permission denied (-EACCES)

[Ezra Kissel]

Hi Howard,

This looks nice, good idea to port the OSU microbenchmarks.  I could see 
adding multi-threaded benchmarks within this framework, but I imagine 
integrating with the ofiwg/fabtests will require some agreement on 
generalizing collectives and launcher support.

- ezra

On 2/10/2016 5:51 PM, Howard wrote:
> Ezra
>
> Check out ported/omb in
> ofi-cray/fabtests-cray on github and see if that's what you're wanting. Does need a pmi library though.
>
> Howard
>
>
> Von meinem iPhone gesendet
>
>> Am 10.02.2016 um 12:48 schrieb Ezra Kissel <ezkissel at indiana.edu>:
>>
>> Great, I will test those changes soon.  Getting some form of distributed, threaded test cases in fabtests would be very helpful, I think.  I agree the MPI dependence is annoying, needing some general job launching and allgather/barrier support instead.  Once I have some free cycles again, I might look at integrating some tests myself.
>>
>> I also have a list of psm issues that have come out of this recent debugging... :)
>>
>>> On 02/10/2016 02:30 PM, Jose, Jithin wrote:
>>> I think the race was because of an unprotected call to get-mr-key. I was able to reproduce it occasionally.
>>>
>>> The following patch fixes it, and the test seems to run fine with it; still running in a loop :)
>>> https://github.com/jithinjosepkl/libfabric/commit/a3a66678cffb376b4cd2bf033ae65fe05df30af0
>>>
>>>
>>> I have also updated the tx_size_left() to check for the CQ availability. All the patches are in https://github.com/jithinjosepkl/libfabric/commits/pr/sockets. Can you give it a try?
>>>
>>> Btw, in the application, do you make sure that some other thread is not issuing any TX operations between fi_tx_size_left() and fi_rma* calls? Otherwise, it can still result in -FI_EAGAIN.
>>>
>>> - Jithin
>>>
>>>
>>>
>>>
>>>
>>>
>>> -----Original Message-----
>>> From: <libfabric-users-bounces at lists.openfabrics.org> on behalf of Ezra Kissel <ezkissel at indiana.edu>
>>> Date: Wednesday, February 10, 2016 at 8:45 AM
>>> To: "libfabric-users at lists.openfabrics.org" <libfabric-users at lists.openfabrics.org>
>>> Subject: [libfabric-users] CQ permission denied (-EACCES)
>>>
>>>> Starting a new thread with the issue I was originally trying to debug.
>>>> We (IU) have libfabric integrated into a task-based runtime system via
>>>> an intermediate RDMA middleware library and one of our unit tests was
>>>> often failing with the following error:
>>>>
>>>> ALL:ERR: 1 (cq_readerr:53): > local CQ: 13 Permission denied
>>>> ALL:ERR: 1 (cq_readerr:54): > local CQ: prov_err: Permission denied (-13)
>>>>
>>>> Obviously, -EACCES is an appropriate CQ error if the incorrect rkey is
>>>> specified in an associated RMA op.  I've spent a lot of time debugging
>>>> this, making sure we are passing the correct rkeys, etc.  I've finally
>>>> been able to reproduce this issue in a small distributed, threaded test
>>>> using the sockets provider again, but unfortunately in a
>>>> non-deterministic way.
>>>>
>>>> https://github.com/disprosium8/fi_thread_test/blob/master/fi_rma_thread_mr.c
>>>>
>>>> Our unit test that fails causes a lot of memory pressure, and lots of
>>>> concurrent memory registrations interleaved with RMA ops.  I tried to
>>>> reproduce this in the above test and it will fail with the CQ error
>>>> after some number of repeated runs.
>>>>
>>>> I get the sense that there's a race condition somewhere, and/or the
>>>> fi_mr descriptors are getting corrupted.  I can't reproduce the error
>>>> without the "alloc_thread" running (athreads=0) in the test, and indeed
>>>> all our other integrated runtime unit tests that have less memory
>>>> pressure are passing OK.
>>>>
>>>> Now that I have a stripped-down test, I can try to more closely trace
>>>> the root cause but I thought I'd ask for thoughts.
>>>>
>>>> - ezra
>>>> _______________________________________________
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