fix link problem with file backend

- must build benchmarks twice, once with pmdk back end and once with
  file backend
- rpath in executable keeps a fixed library linkage otherwise

perf-regression/cooley/bake-kove.qsub

@@ -22,6 +22,7 @@ spack load -r mvapich2
 
 module list
 
+echo "### NOTE: all results in this output are using Kove XPD volumes"
 echo "### NOTE: ALL BAKE RESULTS BELOW are using 2nd socket on cooley nodes: cores 6-11, also using numactl to constrain memory allocations"
 
 kdsa_manage connect mlx5_0.1/260535867639876.8:124391e4-a843-4cc8-ab28-39a93c7cc9e8 xpdha
@@ -62,8 +63,9 @@ mpirun -f $COBALT_NODEFILE -n 2 numactl -N 1 -m 1 ./bake-p2p-bw -x 16777216 -m 3
 kdsa_manage disconnect xpdha
 kdsa_manage connect mlx5_0.1/260535867639876.8:124391e4-a843-4cc8-ab28-39a93c7cc9e8 xpdha
 
-# reset to use file backend
-
+# reset to use file backend. Note that we use a different name for the
+# benchmark executable as well for the one that was linked against this
+# backend and has it's rpath set accordingly.
 spack unload $BAKE_STABLE_VER
 spack load bake@dev-file-backend
 
@@ -72,7 +74,7 @@ sleep 1
 dd bs=4M if=/projects/RAN/toonen/mochi-100GiB-xfs.img of=/dev/xpdha oflag=direct
 mount /kovefs/xfsa
 bake-mkpool /kovefs/xfsa/bake.dat
-mpirun -f $COBALT_NODEFILE -n 2 numactl -N 1 -m 1 ./bake-p2p-bw -x 16777216 -m 34359738368 -n "verbs://" -p /kovefs/xfsa/bake.dat -c 12 -i
+mpirun -f $COBALT_NODEFILE -n 2 numactl -N 1 -m 1 ./bake-p2p-bw-file -x 16777216 -m 34359738368 -n "verbs://" -p /kovefs/xfsa/bake.dat -c 12 -i
 umount /kovefs/xfsa
 
 kdsa_manage disconnect xpdha
@@ -83,7 +85,7 @@ sleep 1
 dd bs=4M if=/projects/RAN/toonen/mochi-100GiB-xfs.img of=/dev/xpdha oflag=direct
 mount /kovefs/xfsa
 bake-mkpool /kovefs/xfsa/bake.dat
-mpirun -f $COBALT_NODEFILE -n 2 numactl -N 1 -m 1 ./bake-p2p-bw -x 16777216 -m 34359738368 -n "verbs://" -p /kovefs/xfsa/bake.dat -c 12 -r 4 -i
+mpirun -f $COBALT_NODEFILE -n 2 numactl -N 1 -m 1 ./bake-p2p-bw-file -x 16777216 -m 34359738368 -n "verbs://" -p /kovefs/xfsa/bake.dat -c 12 -r 4 -i
 umount /kovefs/xfsa
 
 kdsa_manage disconnect xpdha

perf-regression/cooley/run-regression.sh

@@ -82,6 +82,17 @@ cd build
 make -j 3
 make install
 
+# switch bake versions and build another copy with file backend
+echo "=== BUILDING SDS TEST PROGRAMS WITH FILE BACKEND ==="
+spack unload $BAKE_STABLE_VER
+spack load bake@dev-file-backend
+cd $SANDBOX/sds-tests
+mkdir build-file
+cd build-file
+../configure --prefix=${PREFIX}-file CC=mpicc
+make -j 3
+make install
+
 # mercury-runner benchmark
 # echo "=== BUILDING MERCURY-RUNNER BENCHMARK ==="
 # cd $SANDBOX/mercury-runner
@@ -96,6 +107,7 @@ echo "=== SUBMITTING AND WAITING FOR JOB ==="
 cp $PREFIX/bin/margo-p2p-latency $JOBDIR
 cp $PREFIX/bin/margo-p2p-bw $JOBDIR
 cp $PREFIX/bin/bake-p2p-bw $JOBDIR
+cp ${PREFIX}-file/bin/bake-p2p-bw $JOBDIR/bake-p2p-bw-file
 cp $PREFIX/bin/pmdk-bw $JOBDIR
 # cp $PREFIX/bin/mercury-runner $JOBDIR
 cd $JOBDIR