speed up common spmv2 tests

spmv2 uses OpenMP and defaults to number of cores for used threads
per process. This unnecessarily oversubscribes the cores on tests
with 4 processes.
Avoid this by setting OMP_NUM_THREADS to 1 for these tests, resulting
in faster tests.

tests/common/test-spmv2-4.sh

@@ -1,3 +1,3 @@
 #!/bin/sh
-${LAUNCHER-./launcher} -n 4 ../../examples/spmv2 10 3000 | LC_ALL='C' sort > test-spmv2-4.out
+OMP_NUM_THREADS=1 ${LAUNCHER-./launcher} -n 4 ../../examples/spmv2 10 3000 | LC_ALL='C' sort > test-spmv2-4.out
 cmp test-spmv2-4.out "$(dirname -- "${0}")/test-spmv2-4.expected"

tests/common/test-spmv2-shrink-4.sh

@@ -1,4 +1,4 @@
 #!/bin/sh
 # test shrinking in spmv2
-${LAUNCHER-./launcher} -n 4 ../../examples/spmv2 -s 2 10 3000 | LC_ALL='C' sort > test-spmv2-shrink-4.out
+OMP_NUM_THREADS=1 ${LAUNCHER-./launcher} -n 4 ../../examples/spmv2 -s 2 10 3000 | LC_ALL='C' sort > test-spmv2-shrink-4.out
 cmp test-spmv2-shrink-4.out "$(dirname -- "${0}")/test-spmv2-4.expected"

tests/common/test-spmv2-shrink-inc-4.sh

@@ -1,4 +1,4 @@
 #!/bin/sh
 # test shrinking with incremental partitioner
-${LAUNCHER-./launcher} -n 4 ../../examples/spmv2 -s 2 -i 10 3000 | LC_ALL='C' sort > test-spmv2-shrink-inc-4.out
+OMP_NUM_THREADS=1 ${LAUNCHER-./launcher} -n 4 ../../examples/spmv2 -s 2 -i 10 3000 | LC_ALL='C' sort > test-spmv2-shrink-inc-4.out
 cmp test-spmv2-shrink-inc-4.out "$(dirname -- "${0}")/test-spmv2-4.expected"

tests/common/test-spmv2r-4.sh

@@ -1,3 +1,3 @@
 #!/bin/sh
-${LAUNCHER-./launcher} -n 4 ../../examples/spmv2 -r 10 3000 | LC_ALL='C' sort > test-spmv2r-4.out
+OMP_NUM_THREADS=1 ${LAUNCHER-./launcher} -n 4 ../../examples/spmv2 -r 10 3000 | LC_ALL='C' sort > test-spmv2r-4.out
 cmp test-spmv2r-4.out "$(dirname -- "${0}")/test-spmv2-4.expected"