Python script that prints the top N most executed functions in QEMU using perf.
Example Usage: topN_perf.py -n 20 -- /path/to/qemu program -program -flags If '-n' is not specified, the default is 25. Example Output: No. Percentage Name Caller ---- ---------- ------------------------- ------------------------- 1 16.25% float64_mul qemu-x86_64 2 12.01% float64_sub qemu-x86_64 3 11.99% float64_add qemu-x86_64 4 5.69% helper_mulsd qemu-x86_64 5 4.68% helper_addsd qemu-x86_64 6 4.43% helper_lookup_tb_ptr qemu-x86_64 7 4.28% helper_subsd qemu-x86_64 8 2.71% f64_compare qemu-x86_64 9 2.71% helper_ucomisd qemu-x86_64 10 1.04% helper_pand_xmm qemu-x86_64 11 0.71% float64_div qemu-x86_64 12 0.63% helper_pxor_xmm qemu-x86_64 13 0.50% 0x00007f7b7004ef95 [JIT] tid 491 14 0.50% 0x00007f7b70044e83 [JIT] tid 491 15 0.36% helper_por_xmm qemu-x86_64 16 0.32% helper_cc_compute_all qemu-x86_64 17 0.30% 0x00007f7b700433f0 [JIT] tid 491 18 0.30% float64_compare_quiet qemu-x86_64 19 0.27% soft_f64_addsub qemu-x86_64 20 0.26% round_to_int qemu-x86_64 Signed-off-by: Ahmed Karaman <ahmedkhaledkara...@gmail.com> --- scripts/performance/topN_perf.py | 115 +++++++++++++++++++++++++++++++ 1 file changed, 115 insertions(+) create mode 100755 scripts/performance/topN_perf.py diff --git a/scripts/performance/topN_perf.py b/scripts/performance/topN_perf.py new file mode 100755 index 0000000000..53fa503d8a --- /dev/null +++ b/scripts/performance/topN_perf.py @@ -0,0 +1,115 @@ +#!/usr/bin/env python3 + +# Print the top N most executed functions in QEMU using perf. +# Example Usage: +# topN_perf.py -n 20 -- /path/to/qemu program -program -flags +# +# If '-n' is not specified, the default is 25. +# +# This file is a part of the project "TCG Continuous Benchmarking". +# +# Copyright (C) 2020 Ahmed Karaman <ahmedkhaledkara...@gmail.com> +# Copyright (C) 2020 Aleksandar Markovic <aleksandar.qemu.de...@gmail.com> +# +# This program is free software: you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation, either version 2 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program. If not, see <https://www.gnu.org/licenses/>. + +import argparse +import os +import subprocess +import sys + + +# Parse the command line arguments +parser = argparse.ArgumentParser(usage='topN_perf.py [-h] [-n TOP_FUNCTIONS] --' + ' /path/to/qemu program -[flags PROGRAM_FLAGS]') + +parser.add_argument('-n', dest='top', type=int, default=25, + help='Specify the number of top functions to print.') + +parser.add_argument('command', type=str, nargs='+', help=argparse.SUPPRESS) + +args = parser.parse_args() + +# Extract the needed variables from the args +command = args.command +top = args.top + +# Insure that perf is installed +check_perf = subprocess.run(["which", "perf"], stdout=subprocess.DEVNULL) +if check_perf.returncode: + sys.exit("Please install perf before running the script!") + +# Insure user has previllage to run perf +check_previlage = subprocess.run(["perf", "stat", "ls", "/"], + stdout=subprocess.DEVNULL, stderr=subprocess.PIPE) +if check_previlage.returncode: + sys.exit(check_previlage.stderr.decode("utf-8") + + "\nOr alternatively, you can run the script with sudo privileges!") + +# Run perf record +perf_record = subprocess.run((["perf", "record"] + command), + stdout=subprocess.DEVNULL, stderr=subprocess.PIPE) +if perf_record.returncode: + os.unlink('perf.data') + sys.exit(perf_record.stderr.decode("utf-8")) + +# Save perf report output to tmp.perf.data +with open("tmp.perf.data", "w") as output: + perf_report = subprocess.run( + ["perf", "report", "--stdio"], stdout=output, stderr=subprocess.PIPE) + if perf_report.returncode: + os.unlink('perf.data') + output.close() + os.unlink('tmp.perf.data') + sys.exit(perf_report.stderr.decode("utf-8")) + +# Read the reported data to functions[] +functions = [] +with open("tmp.perf.data", "r") as data: + # Only read lines that are not comments (comments start with #) + # Only read lines that are not empty + functions = [line for line in data.readlines() if line and line[0] + != '#' and line[0] != "\n"] + +# Limit the number of top functions to "top" +number_of_top_functions = top if len(functions) > top else len(functions) + +# Store the data of the top functions in top_functions[] +top_functions = functions[:number_of_top_functions] + +# Print information headers +print('{:>4} {:>10} {:<30} {}\n{} {} {} {}'.format('No.', + 'Percentage', + 'Name', + 'Caller', + '-' * 4, + '-' * 10, + '-' * 30, + '-' * 25)) + + +# Print top N functions +for (index, function) in enumerate(top_functions, start=1): + function_data = function.split() + function_percentage = function_data[0] + function_name = function_data[-1] + function_caller = ' '.join(function_data[2:-2]) + print('{:>4} {:>10} {:<30} {}'.format(index, + function_percentage, + function_name, + function_caller)) + +# Remove intermediate files +os.unlink('perf.data') +os.unlink('tmp.perf.data') -- 2.17.1
