def test_gc_diagnosis_cpu_time():
diag = GCDiagnosis(warn_over_frac=0.75)
diag.N_SAMPLES = 3 # shorten tests
with enable_gc_diagnosis_and_log(diag, level="WARN") as sio:
# Spend some CPU time doing only full GCs
for i in range(diag.N_SAMPLES):
gc.collect()
assert not sio.getvalue()
gc.collect()
lines = sio.getvalue().splitlines()
assert len(lines) == 1
# Between 80% and 100%
assert re.match(
r"full garbage collections took (100|[89][0-9])% "
r"CPU time recently",
lines[0],
)
with enable_gc_diagnosis_and_log(diag, level="WARN") as sio:
# Spend half the CPU time doing full GCs
for i in range(diag.N_SAMPLES + 1):
t1 = thread_time()
gc.collect()
dt = thread_time() - t1
run_for(dt, timer=thread_time)
# Less than 75% so nothing printed
assert not sio.getvalue()
def test_gc_diagnosis_cpu_time():
diag = GCDiagnosis(warn_over_frac=0.75)
diag.N_SAMPLES = 3 # shorten tests
with enable_gc_diagnosis_and_log(diag, level='WARN') as sio:
# Spend some CPU time doing only full GCs
for i in range(diag.N_SAMPLES):
gc.collect()
assert not sio.getvalue()
gc.collect()
lines = sio.getvalue().splitlines()
assert len(lines) == 1
# Between 80% and 100%
assert re.match(r"full garbage collections took (100|[89][0-9])% "
r"CPU time recently", lines[0])
with enable_gc_diagnosis_and_log(diag, level='WARN') as sio:
# Spend half the CPU time doing full GCs
for i in range(diag.N_SAMPLES + 1):
t1 = thread_time()
gc.collect()
dt = thread_time() - t1
run_for(dt, timer=thread_time)
# Less than 75% so nothing printed
assert not sio.getvalue()
def test_gc_diagnosis_rss_win():
diag = GCDiagnosis(info_over_rss_win=10e6)
def make_refcycle(nbytes):
l = [b"x" * nbytes]
l.append(l)
return
with enable_gc_diagnosis_and_log(diag) as sio:
make_refcycle(100 * 1024)
gc.collect()
# Too small, nothing printed
assert not sio.getvalue()
# NOTE: need to allocate a very large value to make sure RSS
# really shrinks (depending on the system memory allocator,
# "small" memory deallocations may keep the memory in the pool)
make_refcycle(200 * 1024 * 1024)
gc.collect()
lines = sio.getvalue().splitlines()
assert len(lines) == 1
# Several MB released, and at least 1 reference cycles
assert re.match(
r"full garbage collection released [\d\.]+ MB "
r"from [1-9]\d* reference cycles",
lines[0],
)