comex_nbacc undefined

[jeffdaily]

This was originally reported via email from Luke Roskop from the GAMESS team.

Using GA --with-dmapp.

I am looking at different armci network setups that employ ComEx. On Titan (Cray Gemini network), I run into the following link error.

armci.c:(.text+0xfba): undefined reference to `comex_nbacc'

Looking at the following libraries:

nm --demangle libarmci.a |grep -ir comex_nbacc
                 U comex_nbacc
                 U comex_nbaccs
                 U comex_nbaccv
0000000000002092 T comex_nbaccs
00000000000025b3 T comex_nbaccv

nm --demangle libcomex.a |grep -ir comex_nbacc
0000000000002092 T comex_nbaccs
00000000000025b3 T comex_nbaccv

In my GA build, it does not appear that `comex_nbacc’ is defined.

Any Ideas?

[jeffhammond]

ARMCI_NbAcc used to be a #define to ARMCI_NbAccS back in the day and I suspect that is the issue here. You just have to add comex_nbacc that calls comex_nbaccs or something like that.

[jeffdaily]

We fixed this same issue in other comex implementations, like #44. Clearly we don't use test or use our dmapp one. Cray provides a cray-ga module. I advised this user to avoid our dmapp implementation.

[jeffhammond]

@jeffdaily It depends on the workload but I recall that the NWChem team uses MPI-PR instead of a DMAPP/uGNI version of ARMCI/ComEx on Cray machines. The DMAPP/uGNI ports have never worked reliably for me. Normally, I'd say that ARMCI-MPI is reliable, but it is currently blocked by a Cray MPI bug 🙁