Python performance: Hello numba.

python-perfs/include/collatz_length_numba.py

@@ -0,0 +1,11 @@
+from numba import njit
+
+
+@njit
+def collatz_length(n):
+    if n == 1:
+        return 0
+    if n % 2 == 0:
+        return 1 + collatz_length(n // 2)
+    elif n % 2 == 1:
+        return 1 + collatz_length(n * 3 + 1)

python-perfs/perfs.md

@@ -501,6 +501,21 @@ $ cython -a include/collatz_length_annotated.py
 
 # Numba
 
+Numba est un `JIT` : « Just In Time compiler ».
+
+```python
+#!cat include/collatz_length_numba.py
+```
+
+## Numba démo
+
+```shell
+$ python -m pyperf timeit \
+> -s 'from include.collatz_length_numba import collatz_length' \
+> 'collatz_length(837799)'
+#!cache -- python -m pyperf timeit --fast -s 'from include.collatz_length_numba import collatz_length' 'collatz_length(837799)'
+```
+
 # mypyc
 
 # Pythran

python-perfs/requirements.txt

@@ -2,3 +2,4 @@ pyperf
 cython
 snakeviz
 scalene
+numba