一，工具简介

zfsslower 显示慢于阈值的 ZFS 读取、写入、打开和 fsyncs 操作。

二，代码示例

#!/usr/bin/env pythonfrom __future__ import print_function
from bcc import BPF
import argparse
from time import strftime# arguments
examples = """examples:./zfsslower             # trace operations slower than 10 ms (default)./zfsslower 1           # trace operations slower than 1 ms./zfsslower -j 1        # ... 1 ms, parsable output (csv)./zfsslower 0           # trace all operations (warning: verbose)./zfsslower -p 185      # trace PID 185 only
"""
parser = argparse.ArgumentParser(description="Trace common ZFS file operations slower than a threshold",formatter_class=argparse.RawDescriptionHelpFormatter,epilog=examples)
parser.add_argument("-j", "--csv", action="store_true",help="just print fields: comma-separated values")
parser.add_argu