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Follow the number of CPU set by taskset/cpuset

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Administrators may wish to constrain the set of cores that BIND 9 runs
on via the 'taskset', 'cpuset' or 'numactl' programs (or equivalent on
other O/S), for example to achieve higher (or more stable) performance
by more closely associating threads with individual NIC rx queues. If
the admin has used taskset, it follows that BIND ought to
automatically use the given number of CPUs rather than the system wide
count.

Co-Authored-By: Ray Bellis <ray@isc.org>
This commit is contained in:
Ondřej Surý
2024-08-22 17:23:09 +02:00
parent b65533beff
commit 5a2df8caf5
9 changed files with 247 additions and 4 deletions
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16
bin/tests/system/cpu/clean.sh Normal file
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#!/bin/sh
# Copyright (C) Internet Systems Consortium, Inc. ("ISC")
#
# SPDX-License-Identifier: MPL-2.0
#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, you can obtain one at https://mozilla.org/MPL/2.0/.
#
# See the COPYRIGHT file distributed with this work for additional
# information regarding copyright ownership.
set -e
rm -f ./named.run.*

20
bin/tests/system/cpu/ns1/named.conf.in Normal file
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/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* SPDX-License-Identifier: MPL-2.0
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, you can obtain one at https://mozilla.org/MPL/2.0/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*/
options {
query-source address 10.53.0.1;
port @PORT@;
pid-file "named.pid";
listen-on { 10.53.0.1; };
listen-on-v6 { none; };
};

21
bin/tests/system/cpu/prereq.sh Normal file
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#!/bin/sh
# Copyright (C) Internet Systems Consortium, Inc. ("ISC")
#
# SPDX-License-Identifier: MPL-2.0
#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, you can obtain one at https://mozilla.org/MPL/2.0/.
#
# See the COPYRIGHT file distributed with this work for additional
# information regarding copyright ownership.
. ../conf.sh
command -v cpuset >/dev/null || command -v numactl >/dev/null || command -v taskset >/dev/null || {
echo_i "This test requires cpuset, numactl, or taskset." >&2
exit 255
}
exit 0

21
bin/tests/system/cpu/setup.sh Normal file
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#!/bin/sh -e
# Copyright (C) Internet Systems Consortium, Inc. ("ISC")
#
# SPDX-License-Identifier: MPL-2.0
#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, you can obtain one at https://mozilla.org/MPL/2.0/.
#
# See the COPYRIGHT file distributed with this work for additional
# information regarding copyright ownership.
# shellcheck source=conf.sh
. ../conf.sh
set -e
$SHELL clean.sh
copy_setports ns1/named.conf.in ns1/named.conf

65
bin/tests/system/cpu/tests.sh Executable file
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#!/bin/sh
# Copyright (C) Internet Systems Consortium, Inc. ("ISC")
#
# SPDX-License-Identifier: MPL-2.0
#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, you can obtain one at https://mozilla.org/MPL/2.0/.
#
# See the COPYRIGHT file distributed with this work for additional
# information regarding copyright ownership.
# shellcheck source=conf.sh
. ../conf.sh
status=0
n=0
CPUSET=$(command -v cpuset)
NUMACTL=$(command -v numactl)
TASKSET=$(command -v taskset)
cpulist() (
if [ -n "$CPUSET" ]; then
cpuset -g | head -1 | sed -e "s/.*: //" | tr -s ', ' '\n'
elif [ -n "$NUMACTL" ]; then
numactl --show | sed -ne 's/^physcpubind: //p' | tr -s ' ' '\n'
elif [ -n "$TASKSET" ]; then
# shellcheck disable=SC2046
seq $(taskset -c -p $$ | sed -e 's/.*: //' | tr -s ' -' ' ')
else
echo 0
fi
)
cpulimit() (
set -x
min_cpu="${1}"
shift
max_cpu="${1}"
shift
if [ -n "$CPUSET" ]; then
cpuset -l "${min_cpu}-${max_cpu}" "$@" 2>&1
elif [ -n "$NUMACTL" ]; then
numactl --physcpubind="${min_cpu}-${max_cpu}" "$@" 2>&1
elif [ -n "$TASKSET" ]; then
taskset -c "${min_cpu}-${max_cpu}" "$@" 2>&1
fi
)
ret=0
for cpu in $(cpulist); do
n=$((n + 1))
echo_i "testing that limiting CPU sets to 0-${cpu} works ($n)"
cpulimit 0 "$cpu" "$NAMED" -g >named.run.$n 2>&1 || true
ncpus=$(sed -ne 's/.*found \([0-9]*\) CPU.*\([0-9]*\) worker thread.*/\1/p' named.run.$n)
[ "$ncpus" -eq "$((cpu + 1))" ] || ret=1
done
test "$ret" -eq 0 || echo_i "failed"
status=$((status + ret))
echo_i "exit status: $status"
[ $status -eq 0 ] || exit 1

14
bin/tests/system/cpu/tests_sh_cpu.py Normal file
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# Copyright (C) Internet Systems Consortium, Inc. ("ISC")
#
# SPDX-License-Identifier: MPL-2.0
#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, you can obtain one at https://mozilla.org/MPL/2.0/.
#
# See the COPYRIGHT file distributed with this work for additional
# information regarding copyright ownership.
def test_cpu(run_tests_sh):
run_tests_sh()