tests/perf_bench: Add some configurations for N=32, M=10.

For STM32L072 and similar, very low end targets.

The other perf_bench tests run out of memory, crash, or fail on
prerequisite features.

Signed-off-by: Angus Gratton <gus@projectgus.com>

tests/perf_bench/bm_fannkuch.py

@@ -51,6 +51,7 @@ def fannkuch(n):
 # Benchmark interface
 
 bm_params = {
+    (32, 10): (3,),
     (50, 10): (5,),
     (100, 10): (6,),
     (500, 10): (7,),

tests/perf_bench/bm_nqueens.py

@@ -46,7 +46,7 @@ def n_queens(queen_count):
 # Benchmark interface
 
 bm_params = {
-    (50, 25): (1, 5),
+    (32, 10): (1, 5),
     (100, 25): (1, 6),
     (1000, 100): (1, 7),
     (5000, 100): (1, 8),

tests/perf_bench/bm_pidigits.py

@@ -36,6 +36,7 @@ def gen_pi_digits(n):
 # Benchmark interface
 
 bm_params = {
+    (32, 10): (1, 20),
     (50, 25): (1, 35),
     (100, 100): (1, 65),
     (1000, 1000): (2, 250),

tests/perf_bench/core_import_mpy_multi.py

@@ -73,7 +73,7 @@ def test(r):
 # Benchmark interface
 
 bm_params = {
-    (100, 10): (50,),
+    (32, 10): (50,),
     (1000, 10): (500,),
     (5000, 10): (5000,),
 }

tests/perf_bench/core_qstr.py

@@ -10,7 +10,7 @@ def test(r):
 # Benchmark interface
 
 bm_params = {
-    (100, 10): (400,),
+    (32, 10): (400,),
     (1000, 10): (4000,),
     (5000, 10): (40000,),
 }

tests/run-perfbench.py

@@ -260,7 +260,9 @@ def main():
     )
     cmd_parser.add_argument("--via-mpy", action="store_true", help="compile code to .mpy first")
     cmd_parser.add_argument("--mpy-cross-flags", default="", help="flags to pass to mpy-cross")
-    cmd_parser.add_argument("N", nargs=1, help="N parameter (approximate target CPU frequency)")
+    cmd_parser.add_argument(
+        "N", nargs=1, help="N parameter (approximate target CPU frequency in MHz)"
+    )
     cmd_parser.add_argument("M", nargs=1, help="M parameter (approximate target heap in kbytes)")
     cmd_parser.add_argument("files", nargs="*", help="input test files")
     args = cmd_parser.parse_args()