Minor changes to mdrun -h descriptions

Hopefully these are easier to understand. The suggested application
for -pinoffset is covered in the new mdrun performance section
of the user guide, on release-5-0 branch.

Change-Id: I7bc6172a70c39c02f6ca6db17e26b08d2ca3b444

diff --git a/src/programs/mdrun/mdrun.cpp b/src/programs/mdrun/mdrun.cpp
index b3df7ca4a826700b949550dada55fa7f3a213f51..52d866fdf89a4809163d10bd0823b04a061a8ee7 100644 (file)
--- a/src/programs/mdrun/mdrun.cpp
+++ b/src/programs/mdrun/mdrun.cpp
@@ -517,9 +517,9 @@ int gmx_mdrun(int argc, char *argv[])
         { "-ntomp_pme", FALSE, etINT, {&hw_opt.nthreads_omp_pme},
           "Number of OpenMP threads per MPI rank to start (0 is -ntomp)" },
         { "-pin",     FALSE, etENUM, {thread_aff_opt},
-          "Set thread affinities" },
+          "Whether mdrun should try to set thread affinities" },
         { "-pinoffset", FALSE, etINT, {&hw_opt.core_pinning_offset},
-          "The starting logical core number for pinning to cores; used to avoid pinning threads from different mdrun instances to the same core" },
+          "The lowest logical core number to which mdrun should pin the first thread" },
         { "-pinstride", FALSE, etINT, {&hw_opt.core_pinning_stride},
           "Pinning distance in logical cores for threads, use 0 to minimize the number of threads per physical core" },
         { "-gpu_id",  FALSE, etSTR, {&hw_opt.gpu_opt.gpu_id},