Very quick plot of passenger instance memory usage over time

passenger-memory-over-time.py

# Requires install of packages:
#   - delta
#   - leather
#
# Working with data written periodically to a file:
# `passenger-status --show=xml | python <(echo -e "import xmltodict\nimport json\nimport sys\nprint(json.dumps(xmltodict.parse(sys.stdin.read())))")`

import json
from collections import defaultdict
import leather
import delta

def get_x(point, index):
    uptime = point["uptime"]
    return delta.parse(uptime).total_seconds()

def get_y(point, index):
    return int(point.get("real_memory", -1))

def read_data():
    process_data = defaultdict(list)

    with open("statuses", "r") as file:
        for line in file.readlines():
            line_data = json.loads(line)["info"]["supergroups"]["supergroup"]["group"]["processes"]["process"]

            for point in line_data:
                pid = point["pid"]
                process_data[pid].append(point)

    return process_data

def main():
    process_data = read_data()

    chart = leather.Chart("Line")
    for pid, data in process_data.items():
        chart.add_line(data, x=get_x, y=get_y, name=pid)
    chart.to_svg("save.svg", height=2000, width=10000)

main()