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Add benchmark to measure gc collection of a big chain of cycles #243

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Merged
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Nov 7, 2022
Merged

Add benchmark to measure gc collection of a big chain of cycles #243

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9 changes: 9 additions & 0 deletions pyperformance/data-files/benchmarks/bm_gc_collect/pyproject.toml
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[project]
name = "pyperformance_bm_gc_collect"
requires-python = ">=3.8"
dependencies = ["pyperf"]
urls = {repository = "https://github.com/python/pyperformance"}
dynamic = ["version"]

[tool.pyperformance]
name = "gc_collect"
64 changes: 64 additions & 0 deletions pyperformance/data-files/benchmarks/bm_gc_collect/run_benchmark.py
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import pyperf
import gc

CYCLES = 100
LINKS = 20


class Node:
def __init__(self):
self.next = None
self.prev = None

def link_next(self, next):
self.next = next
self.next.prev = self


def create_cycle(node, n_links):
"""Create a cycle of n_links nodes, starting with node."""

if n_links == 0:
return

current = node
for i in range(n_links):
next_node = Node()
current.link_next(next_node)
current = next_node

current.link_next(node)


def create_gc_cycles(n_cycles, n_links):
"""Create n_cycles cycles n_links+1 nodes each."""

cycles = []
for _ in range(n_cycles):
node = Node()
cycles.append(node)
create_cycle(node, n_links)
return cycles


def benchamark_collection(loops, cycles, links):
total_time = 0
for _ in range(loops):
gc.collect()
all_cycles = create_gc_cycles(cycles, links)

# Main loop to measure
del all_cycles
t0 = pyperf.perf_counter()
collected = gc.collect()
total_time += pyperf.perf_counter() - t0

assert collected >= cycles * (links + 1)

return total_time


if __name__ == "__main__":
runner = pyperf.Runner()
runner.metadata["description"] = "GC link benchmark"
runner.bench_time_func("create_gc_cycles", benchamark_collection, CYCLES, LINKS)