tests/thread: Allow some tests to run on ports with not much heap.

tests/thread/mutate_bytearray.py

@@ -26,10 +26,11 @@ def th(n, lo, hi):
 lock = _thread.allocate_lock()
 n_thread = 4
 n_finished = 0
+n_repeat = 4 # use 40 for more stressful test (uses more heap)
 
 # spawn threads
 for i in range(n_thread):
-    _thread.start_new_thread(th, (40, i * 256 // n_thread, (i + 1) * 256 // n_thread))
+    _thread.start_new_thread(th, (n_repeat, i * 256 // n_thread, (i + 1) * 256 // n_thread))
 
 # busy wait for threads to finish
 while n_finished < n_thread:

tests/thread/mutate_instance.py

@@ -25,7 +25,7 @@ def th(n, lo, hi):
 
 lock = _thread.allocate_lock()
 n_repeat = 30
-n_range = 300
+n_range = 50 # 300 for stressful test (uses more heap)
 n_thread = 4
 n_finished = 0
 

tests/thread/thread_qstr1.py

@@ -22,10 +22,11 @@ def th(base, n):
 lock = _thread.allocate_lock()
 n_thread = 4
 n_finished = 0
+n_qstr_per_thread = 100 # make 1000 for a more stressful test (uses more heap)
 
 # spawn threads
 for i in range(n_thread):
-    _thread.start_new_thread(th, (i * 1000, 1000))
+    _thread.start_new_thread(th, (i * n_qstr_per_thread, n_qstr_per_thread))
 
 # busy wait for threads to finish
 while n_finished < n_thread: