heap_info.py

#!/usr/bin/python3

import sys, re, matplotlib.pyplot as plt, matplotlib.dates as mpdates, datetime

timestamps = []
heap_total = []
alloc_diff = []

re_timestamp = re.compile(r'^===(\d+)')
re_heap = re.compile(r'^\[Heap\] total number of bytes: (\d+)')
re_alloc = re.compile(r'^\[Heap\] allocs/deallocs: (\d+)/(\d+)')

with open(sys.argv[1], 'r') as f:
    for line in f:
        match = re_timestamp.search(line)
        if match:
            timestamps.append(datetime.datetime.fromtimestamp(int(match.group(1))))
        match = re_heap.search(line)
        if match:
            heap_total.append(int(match.group(1)) / 1024 / 1024)
        match = re_alloc.search(line)
        if match:
            alloc_diff.append(int(match.group(1)) - int(match.group(2)))

fig, ax1 = plt.subplots()
fig.set_size_inches(14, 10)

ax1.xaxis.set_major_formatter(mpdates.DateFormatter('%H:%M'))
ax1.plot(timestamps, heap_total, color="blue")
ax1.set_title("Nimbus heap during initial sync")
ax1.set_xlabel("time")
ax1.set_ylabel("heap total (MiB)", color="blue")
ax1.tick_params('y', colors='blue')

ax2 = ax1.twinx()
ax2.xaxis.set_major_formatter(mpdates.DateFormatter('%H:%M'))
ax2.plot(timestamps, alloc_diff, color="red")
ax2.set_ylabel("no. allocs - no. deallocs", color="red")
ax2.tick_params('y', colors='red')

fig.tight_layout()
fig.savefig("heap.svg", dpi=100)