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#!/usr/bin/env python3
import re
import matplotlib.pyplot as plt
import numpy as np
import sys
ptr = "(?:0x)?(?P<ptr>(?:\w+)|(?:\(nil\)))"
size = "(?P<size>\d+)"
alignment = "(?P<alignment>\d+)"
malloc_re = re.compile(f"^m {size} {ptr}$")
free_re = re.compile(f"^f {ptr}$")
calloc_re = re.compile(f"^c (?P<nmemb>\d+) {size} {ptr}$")
realloc_re = re.compile(f"^r {ptr} {size} {ptr.replace('ptr', 'nptr')}$")
memalign_re = re.compile(f"^ma {alignment} {size} {ptr}$")
posix_memalign_re = re.compile(f"^p_ma {ptr} {alignment} {size} (?P<ret>\d+)$")
valloc_re = re.compile(f"^v {size} {ptr}$")
pvalloc_re = re.compile(f"^pv {size} {ptr}$")
aligned_alloc_re = re.compile(f"^a_m {alignment} {size} {ptr}$")
trace_regex = {"malloc": malloc_re, "free": free_re, "calloc": calloc_re,
"realloc": realloc_re, "memalign": memalign_re,
"posix_memalign": posix_memalign_re, "valloc": valloc_re,
"pvalloc": pvalloc_re, "aligned_alloc": aligned_alloc_re}
def record_allocation(hist, total_size, allocations, ptr, size, coll_size,
req_size, nohist, optr=None, free=False):
"""add allocation to histogram or total requested memory
hist - dict mapping allocation sizes to their occurrence
total_size - list of total requested memory till last recorded function call
allocations - dict of life allocations mapping their pointer to their size
ptr - pointer returned from function to record
size - size passed to function to record
coll_size - should the total memory be tracked
req_size - track only allocations of requested size
nohist - don't create a histogram
optr - pointer passed to funtion to record
free - is recorded function free(ptr)"""
if not free:
size = int(size)
# realloc returns new pointer
if optr and optr in allocations:
size -= allocations[optr]
del(allocations[optr])
allocations[ptr] = size
if not nohist:
hist[size] = hist.get(size, 0) + 1
if type(total_size[-1]) != int or type(size) != int:
print("invalid type", type(total_size[-1]), type(size))
return
if coll_size:
if not req_size or size == req_size:
total_size.append(total_size[-1] + size)
elif req_size:
total_size.append(total_size[-1])
# free of a valid pointer
elif ptr != "(nil)" and ptr in allocations:
size = allocations[ptr]
if coll_size:
if not req_size or size == req_size:
total_size.append(total_size[-1] - size)
elif req_size:
total_size.append(total_size[-1])
del(allocations[ptr])
# free of invalid pointer
elif coll_size:
total_size.append(total_size[-1])
def parse(path="chattymalloc.txt", coll_size=True, req_size=None, nohist=False):
# count function calls
calls = {"malloc": 0, "free": 0, "calloc": 0, "realloc": 0, "memalign": 0,
"posix_memalign": 0, "valloc": 0, "pvalloc": 0, "aligned_alloc": 0}
# Dictionary to track all live allocations
allocations = {}
# List of total live memory per operation
requested_size = [0]
# Dictionary mapping allocation sizes to the count of their appearance
hist = {}
ln = 0
def record(ptr, size, optr=None, free=False):
"""Wrapper around record_allocation using local variables from parse"""
record_allocation(hist, requested_size, allocations, ptr, size,
coll_size, req_size, nohist, optr, free)
with open(path, "r") as f:
for i, l in enumerate(f.readlines()):
ln += 1
valid_line = False
for func, func_regex in trace_regex.items():
res = func_regex.match(l)
if res is not None:
calls[func] += 1
res = res.groupdict()
if func == "free":
record(res["ptr"], 0, free=True)
elif func == "calloc":
record(res["ptr"], int(res["nmemb"]) * int(res["size"]))
elif func == "realloc":
record(res["nptr"], res["size"], optr=res["ptr"])
else:
record(res["ptr"], res["size"])
valid_line = True
break
if not valid_line:
print("\ninvalid line at", ln, ":", l)
return hist, calls, np.array(requested_size)
def plot(path):
hist, calls, total_sizes = parse(path=path, req_size=None)
plot_hist_ascii(path+".hist", hist, calls)
top5 = [t[1] for t in sorted([(n, s) for s, n in hist.items()])[-5:]]
del hist
del calls
plot_profile(total_sizes, path, path + ".profile.png", top5)
def plot_profile(total_sizes, trace_path, plot_path, sizes):
x_vals = range(0, len(total_sizes))
plt.plot(x_vals, total_sizes / 1000, marker='',
linestyle='-', label="Total requested")
for s in sizes:
_, _, total_size = parse(path=trace_path, nohist=True, req_size=s)
plt.plot(x_vals, total_size / 1000, label=s)
plt.legend(loc="lower center")
plt.xlabel("Allocations")
plt.ylabel("mem in kb")
plt.title("Memusage profile")
plt.savefig(plot_path)
plt.clf()
def plot_hist_ascii(path, hist, calls):
bins = {}
for size in sorted(hist):
bin = int(size / 16)
bins[bin] = bins.get(bin, 0) + hist[size]
total = sum(calls.values()) - calls["free"]
with open(path, "w") as f:
print("Total function calls:", total, file=f)
for func in trace_regex:
print(func, calls[func], file=f)
print(file=f)
print("allocations <= 64", sum([n for s, n in hist.items() if s <= 64]), file=f)
print("allocations <= 1024", sum([n for s, n in hist.items() if s <= 1024]), file=f)
print("allocations <= 4096", sum([n for s, n in hist.items() if s <= 4096]), file=f)
print(file=f)
print("Histogram of sizes:", file=f)
sbins = sorted(bins)
binmaxlength = str(len(str(sbins[-1])) + 1)
amountmaxlength = str(len(str(sorted(bins.values())[-1])))
for b in sbins:
perc = bins[b]/total*100
binsize = "{:<" + binmaxlength + "} - {:>" + binmaxlength + "}"
print(binsize.format((b)*16, (b+1)*16-1), end=" ", file=f)
amount = "{:<" + amountmaxlength + "} {:.2f}% {}"
print(amount.format(bins[b], perc, '*'*int(perc/2)), file=f)
if __name__ == "__main__":
if len(sys.argv) != 2:
print("chattyparser: parse chattymalloc output and create size histogram and memory profile", file=sys.stderr)
print(f"Usage: {sys.argv[0]} chattymalloc-file", file=sys.stderr)
exit(1)
plot(sys.argv[1])
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