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hotspot.py
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hotspot.py
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#!/usr/bin/env python3
###########################################################################################################
# Copyright (C) 2021-2023 Intel Corporation
# SPDX-License-Identifier: BSD-3-Clause
###########################################################################################################
import logging
import os
import platform
import shlex
import shutil
import subprocess
import sys
from argparse import ArgumentParser
from src.common import configure_logging, crash
from src.perf_helpers import get_perf_list
def fix_path(script):
return os.path.join(
getattr(sys, "_MEIPASS", os.path.dirname(os.path.abspath(__file__))),
script,
)
def attach_perf_map_agent():
# look for java processes
try:
pids = (
subprocess.check_output(shlex.split("pgrep java"), encoding="UTF-8")
.strip()
.split("\n")
)
except subprocess.CalledProcessError:
return
if len(pids) > 0 and pids[0] != "":
logging.info("detected java processes: " + str(pids))
# setup tmp folder for storing perf-map-agent
if not os.path.exists("/tmp/perfspect"):
os.mkdir("/tmp/perfspect")
shutil.copy(fix_path("attach-main.jar"), "/tmp/perfspect")
shutil.copy(fix_path("libperfmap.so"), "/tmp/perfspect")
os.chmod("/tmp/perfspect/attach-main.jar", 0o666)
os.chmod("/tmp/perfspect/libperfmap.so", 0o666)
for pid in pids:
uid = subprocess.check_output(
shlex.split("awk '/^Uid:/{print $2}' /proc/" + pid + "/status"),
encoding="UTF-8",
)
gid = subprocess.check_output(
shlex.split("awk '/^Gid:/{print $2}' /proc/" + pid + "/status"),
encoding="UTF-8",
)
JAVA_HOME = subprocess.check_output(
shlex.split('sed "s:bin/java::"'),
input=subprocess.check_output(
shlex.split("readlink -f /usr/bin/java"), encoding="UTF-8"
),
encoding="UTF-8",
).strip()
current_dir = os.getcwd()
try:
os.chdir("/tmp/perfspect/")
subprocess.check_call(
shlex.split(
f"sudo -u \\#{uid} -g \\#{gid} {JAVA_HOME}bin/java -cp /tmp/perfspect/attach-main.jar:{JAVA_HOME}lib/tools.jar net.virtualvoid.perf.AttachOnce {pid}"
),
encoding="UTF-8", # type: ignore
)
logging.info("Successfully attached perf-map-agent to: " + pid)
except subprocess.CalledProcessError:
logging.info("Failed to attach perf-map-agent to: " + pid)
os.chdir(current_dir)
if __name__ == "__main__":
configure_logging(".")
parser = ArgumentParser(
description="hotspot: PMU based flamegraphs for hotspot analysis"
)
parser.add_argument(
"-t",
"--timeout",
required=True,
type=int,
help="collection time",
)
args = parser.parse_args()
if os.geteuid() != 0:
crash("Must run as root, please re-run")
if platform.system() != "Linux":
crash("PerfSpect currently supports Linux only")
get_perf_list()
events = ["instructions", "cycles", "branch-misses", "cache-misses"]
logging.info("collecting...")
attach_perf_map_agent()
subprocess.run(
shlex.split(
"sudo perf record -a -g -F 99 -e "
+ ",".join(events)
+ " sleep "
+ str(args.timeout)
)
)
logging.info("postprocessing...")
script = subprocess.run(
shlex.split("perf script"),
stdout=subprocess.PIPE,
)
cycles_collapse = ""
with open("cycles.col", "w") as c:
cycles_collapse = subprocess.run(
shlex.split(fix_path("stackcollapse-perf.pl") + ' --event-filter="cycles"'),
input=script.stdout,
stdout=c,
)
for event, subtitle, differential in [
["branch-misses", "What is being stalled by poor prefetching", False],
["cache-misses", "What is being stalled by poor caching", False],
["instructions", "CPI: blue = vectorized, red = stalled", True],
]:
with open(event + ".svg", "w") as f:
collapse = ""
with open(event + ".col", "w") as e:
collapse = subprocess.run(
shlex.split(
fix_path("stackcollapse-perf.pl")
+ ' --event-filter="'
+ event
+ '"'
),
input=script.stdout,
stdout=e,
)
if differential:
with open("diff.col", "w") as e:
collapse = subprocess.run(
shlex.split(
fix_path("difffolded.pl") + " " + event + ".col cycles.col"
),
stdout=e,
)
with open("diff.col" if differential else event + ".col", "r") as e:
flamegraph = subprocess.run(
shlex.split(
fix_path("flamegraph.pl")
+ ' --title="'
+ event
+ '" --subtitle="'
+ subtitle
+ '"'
),
stdin=e,
stdout=f,
)
os.remove(event + ".col")
if differential:
os.remove("diff.col")
os.chmod(event + ".svg", 0o666)
logging.info("generated " + event + ".svg")
os.remove("cycles.col")