Created
June 29, 2023 21:02
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#!/usr/bin/env python | |
# Derived from https://github.com/apangin/jstackmem/blob/master/jstackmem.py | |
import bisect | |
import re | |
import subprocess | |
import sys | |
if len(sys.argv) < 2: | |
print("Calculate stack memory used by a Java process") | |
print("Usage: python jstackmem.py <pid>") | |
sys.exit() | |
# Read memory map of the target process | |
try: | |
pid = sys.argv[1] | |
with open("/proc/" + pid + "/smaps") as f: | |
smaps = f.readlines() | |
except Exception as e: | |
print("Failed to open process memory map") | |
raise e | |
# Parse memory map | |
last_addr = None | |
addr = [] | |
pss = [] | |
shared = [] | |
for line in smaps: | |
m = re.match("([0-9a-f]+)-([0-9a-f]+) (..).+", line) | |
if m: | |
last_addr = int(m.group(1), 16) if m.group(3) == "rw" else None | |
elif last_addr: | |
m = re.match("Pss: +([0-9]+) kB", line) | |
if m: | |
addr.append(last_addr) | |
pss.append(int(m.group(1))) | |
shared.append(False) | |
# Match stack addresses from jstack output with the memory map | |
try: | |
stack_total = 0 | |
jstack = subprocess.Popen(["jstack", pid], stdout=subprocess.PIPE) | |
while True: | |
line = jstack.stdout.readline() | |
if not line: | |
break | |
line = line.decode("utf-8") | |
m = re.match("\"([^\"]*)\" .+\[0x([0-9a-f]+)\]\n", line) | |
if m: | |
addr_index = bisect.bisect(addr, int(m.group(2), 16)) - 1 | |
if shared[addr_index]: | |
# Region already counted | |
print("%6d` %s" % (pss[addr_index], m.group(1))) | |
else: | |
print("%6d %s" % (pss[addr_index], m.group(1))) | |
stack_total += pss[addr_index] | |
shared[addr_index] = True | |
except Exception as e: | |
print("Failed to execute jstack") | |
raise e | |
print("%6d (Total)" % stack_total) |
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