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#!/usr/bin/env python
import gc
from io import BytesIO
import tracemalloc
try:
import psutil
except ImportError as err:
raise ImportError("This script requires psutil") from err
import numpy as np
def run_memleak_test(bench, iterations, report):
tracemalloc.start()
starti = min(50, iterations // 2)
endi = iterations
malloc_arr = np.empty(endi, dtype=np.int64)
rss_arr = np.empty(endi, dtype=np.int64)
rss_peaks = np.empty(endi, dtype=np.int64)
nobjs_arr = np.empty(endi, dtype=np.int64)
garbage_arr = np.empty(endi, dtype=np.int64)
open_files_arr = np.empty(endi, dtype=np.int64)
rss_peak = 0
p = psutil.Process()
for i in range(endi):
bench()
gc.collect()
rss = p.memory_info().rss
malloc, peak = tracemalloc.get_traced_memory()
nobjs = len(gc.get_objects())
garbage = len(gc.garbage)
open_files = len(p.open_files())
print(f"{i: 4d}: pymalloc {malloc: 10d}, rss {rss: 10d}, "
f"nobjs {nobjs: 10d}, garbage {garbage: 4d}, "
f"files: {open_files: 4d}")
if i == starti:
print(f'{" warmup done ":-^86s}')
malloc_arr[i] = malloc
rss_arr[i] = rss
if rss > rss_peak:
rss_peak = rss
rss_peaks[i] = rss_peak
nobjs_arr[i] = nobjs
garbage_arr[i] = garbage
open_files_arr[i] = open_files
print('Average memory consumed per loop: {:1.4f} bytes\n'.format(
np.sum(rss_peaks[starti+1:] - rss_peaks[starti:-1]) / (endi - starti)))
from matplotlib import pyplot as plt
from matplotlib.ticker import EngFormatter
bytes_formatter = EngFormatter(unit='B')
fig, (ax1, ax2, ax3) = plt.subplots(3)
for ax in (ax1, ax2, ax3):
ax.axvline(starti, linestyle='--', color='k')
ax1b = ax1.twinx()
ax1b.yaxis.set_major_formatter(bytes_formatter)
ax1.plot(malloc_arr, 'C0')
ax1b.plot(rss_arr, 'C1', label='rss')
ax1b.plot(rss_peaks, 'C1', linestyle='--', label='rss max')
ax1.set_ylabel('pymalloc', color='C0')
ax1b.set_ylabel('rss', color='C1')
ax1b.legend()
ax2b = ax2.twinx()
ax2.plot(nobjs_arr, 'C0')
ax2b.plot(garbage_arr, 'C1')
ax2.set_ylabel('total objects', color='C0')
ax2b.set_ylabel('garbage objects', color='C1')
ax3.plot(open_files_arr)
ax3.set_ylabel('open file handles')
if not report.endswith('.pdf'):
report = report + '.pdf'
fig.tight_layout()
fig.savefig(report, format='pdf')
class MemleakTest:
def __init__(self, empty):
self.empty = empty
def __call__(self):
import matplotlib.pyplot as plt
fig = plt.figure(1)
if not self.empty:
t1 = np.arange(0.0, 2.0, 0.01)
y1 = np.sin(2 * np.pi * t1)
y2 = np.random.rand(len(t1))
X = np.random.rand(50, 50)
ax = fig.add_subplot(221)
ax.plot(t1, y1, '-')
ax.plot(t1, y2, 's')
ax = fig.add_subplot(222)
ax.imshow(X)
ax = fig.add_subplot(223)
ax.scatter(np.random.rand(50), np.random.rand(50),
s=100 * np.random.rand(50), c=np.random.rand(50))
ax = fig.add_subplot(224)
ax.pcolor(10 * np.random.rand(50, 50))
fig.savefig(BytesIO(), dpi=75)
fig.canvas.flush_events()
plt.close(1)
if __name__ == '__main__':
import argparse
parser = argparse.ArgumentParser('Run memory leak tests')
parser.add_argument('backend', type=str, nargs=1,
help='backend to test')
parser.add_argument('iterations', type=int, nargs=1,
help='number of iterations')
parser.add_argument('report', type=str, nargs=1,
help='filename to save report')
parser.add_argument('--empty', action='store_true',
help="Don't plot any content, just test creating "
"and destroying figures")
parser.add_argument('--interactive', action='store_true',
help="Turn on interactive mode to actually open "
"windows. Only works with some GUI backends.")
args = parser.parse_args()
import matplotlib
matplotlib.use(args.backend[0])
if args.interactive:
import matplotlib.pyplot as plt
plt.ion()
run_memleak_test(
MemleakTest(args.empty), args.iterations[0], args.report[0])
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