5.38 BCC工具之ugc.py解读

一，工具简介

ugc工具跟踪包���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/pythonfrom __future__ import print_functionimport argparsefrom bcc import BPF, USDT, utilsimport ctypes as ctimport timeimport oslanguages = ["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