Instantly share code, notes, and snippets.

# todbot/raise_vs_return_code.py

Created May 14, 2024 20:45
Show Gist options
• Save todbot/6a3c8e5633a7267465775aa3afda99fd to your computer and use it in GitHub Desktop.
Attempt to estimate cost of exception raise vs return in CircuitPython
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters. Learn more about bidirectional Unicode characters
 # raise_vs_return_code.py -- Attempt to estimate cost of exception raise vs return in CircuitPython # 14 May 2024 - @todbot import time import random import gc num_runs = 50000 # functions that do a small amount of something but really nothing def do_something_return(): nstr = str(random.random()) return nstr def do_something_raise(): nstr = str(random.random()) raise Exception(nstr) print("num_runs:", num_runs) gc.collect() m1s = gc.mem_free() st = time.monotonic() for i in range(num_runs): do_something_return() t1 = time.monotonic() - st m1 = m1s - gc.mem_free() print("return t:", t1, "mem:", m1) gc.collect() m2s = gc.mem_free() st = time.monotonic() for i in range(num_runs): try: do_something_raise() except Exception: pass t2 = time.monotonic() - st m2 = m2s - gc.mem_free() print(" raise t:", t2, "mem:", m2) print("delta: %.3f secs, mem: %.3f bytes" % (t2/t1, m2/m1)) while True: pass

### todbot commented May 14, 2024

On `Adafruit CircuitPython 9.0.3 on 2024-04-04; LOLIN S3 MINI 4MB Flash 2MB PSRAM with ESP32S3`, the results are pretty consistently like this:

``````num_runs: 50000
return t: 6.66699 mem: 13136
raise t: 8.86987 mem: 19232
delta: 1.330 secs, mem: 1.464 bytes
``````

That is, about 33% longer in time and about 46% more memory. The 33% longer in time is what I see in Python3.12 on MacOS too. (Python3 `gc.mem_free()` doesn't exist)