[libfabric-users] Using libfabric on Titan
jswaro at cray.com
Thu May 3 12:38:18 PDT 2018
I would add that you can also attach my name to the issue.
Feel free to reach out. I'd have answered earlier, but Howard already caught what I was going to say.
On 5/3/18, 2:36 PM, "Pritchard Jr., Howard" <howardp at lanl.gov> wrote:
Yes. If you hit bugs please open issues on
and @hppritcha in the issue.
Don’t expect very good performance on theta for small transfers.
On theta, you’ll want to use the --enable-ugni-static
configure option to help a little bit with those slow processors.
You may also want to peruse
Office 9, 2nd floor Research Park
TA-03, Building 4200, Room 03U
Los Alamos National Laboratory
On 5/3/18, 1:24 PM, "Philip Davis" <philip.e.davis at rutgers.edu> wrote:
>Thanks for the quick reply. That’s disappointing, but understandable. Is
>the GNI provider supported on Cori and Theta?
>> On May 3, 2018, at 2:49 PM, Pritchard Jr., Howard <howardp at lanl.gov>
>> the GNI provider isn’t supposed on Titan - OS is too old.
>> Howard Pritchard
>> B Schedule
>> Office 9, 2nd floor Research Park
>> TA-03, Building 4200, Room 03U
>> Los Alamos National Laboratory
>> On 5/3/18, 11:21 AM, "Hefty, Sean" <sean.hefty at intel.com> wrote:
>>> Copying ofiwg, Howard, and Jim.
>>>> Apologies if this has been asked before.
>>>> I am trying to use the GNI provider for libfabric on Titan, the XK7
>>>> machine at ORNL. Is this possible/supported?
>>>> More specifically, I need to be able to communicate between aprun
>>>> instances (e.g. aprun ./writer and aprun ./reader are able to
>>>> communicate with each other) so the sharing of credentials between the
>>>> programs is necessary. I have been referring to the cray-tests repo as
>>>> an example of how to use rdma credentials for Cray in Libfabric. I
>>>> modified this code somewhat by replacing all DRC code with just
>>>> setting the cookie manually, and had hoped that would work.
>>>> Unfortunately, the library relies on GNI_GetPtag to set the ptag, and
>>>> this API call does not seem to work on Titan. I can get the
>>>> auth_keys_test to pass by adding a ptag field to the
>>>> fi_gni_raw_auth_key struct along with appropriate language to handle
>>>> that, but I was wondering if there was some inherently supported way
>>>> to do that same thing without modifying libfabric.
>>>> Other than credentials exchange/loading, i am wondering what I can
>>>> expect in trying to use the GNI provider on a non-ARIES system. Has
>>>> anyone done this successfully?
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