5.38 BCC工具之ugc.py解读

一，工具简介

ugc工具跟踪包括Java、Python、Ruby和Node在内的高级语言中的垃圾回收事件。如果可用，每个GC事件都会附带打印一些由该语言的运行时提供的附加信息。同时还会提供GC事件的持续时间。

二，代码示例

#!/usr/bin/python
from __future__ import print_function
import argparse
from bcc import BPF, USDT, utils
import ctypes as ct
import time
import os
languages = ["java", "node", "python", "ruby"]
examples = """examples:
    ./ugc -l java 185        # trace Java GCs in process 185
    ./ugc -l ruby 1344 -m    # trace Ruby GCs reporting in ms
    ./ugc -M 10 -l java 185  # trace only Java GCs longer than 10ms
"""
parser = argparse.ArgumentParser(
    description="Summarize garbage collection events in high-level languages.",
    formatter_class=argparse.RawDescriptionHelpFormatter,
    epilog=examples)
parser.add_argument("-l", "--language", choices=languages,
    help="language to trace")
parser.add