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Adjust CPU runtime allocation to support multiple add-ons (#2655)

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Adjust realtime CPU runtime allocation to support multiple
add-ons/plug-ins with the runtime flag set.

The cpu.rt_runtime_us allocation is somewhat special as it
allocates the guaranteed runtime. Hence we cannot simply allocate all
time to each add-on.

Unfortunately we cannot distribute the CPU time equally based on the
number of add-ons as we don't know the number of add-ons which will use
realtime ahead of time. Also adjusting at runtime is currenlty not
supported by the Docker Python SDK (the underlying http API does
however, so this would be a possible future improvement).

This solution distributes the total available time of 950ms to up to 5
add-ons/plug-ins in equal slices. On a quad-core system this allows up
to 760ms CPU time in the real-time scheduler per 1s (76% of one CPU)
which should be sufficient for most cases.
This commit is contained in:
Stefan Agner 2021-03-01 15:29:10 +01:00 committed by GitHub
parent b288554d9c
commit 9e86eda05a
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GPG Key ID: 4AEE18F83AFDEB23
3 changed files with 15 additions and 3 deletions
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11
supervisor/const.py
View File

@ -32,6 +32,17 @@ DOCKER_NETWORK = "hassio"
DOCKER_NETWORK_MASK = ip_network("172.30.32.0/23")
DOCKER_NETWORK_RANGE = ip_network("172.30.33.0/24")
# This needs to match the dockerd --cpu-rt-runtime= argument.
DOCKER_CPU_RUNTIME_TOTAL = 950_000
# The rt runtimes are guarantees, hence we cannot allocate more
# time than available! Support up to 5 containers with equal time
# allocated.
# Note that the time is multiplied by CPU count. This means that
# a single container can schedule up to 950/5*4 = 760ms in RT priority
# on a quad core system.
DOCKER_CPU_RUNTIME_ALLOCATION = int(DOCKER_CPU_RUNTIME_TOTAL / 5)
DNS_SUFFIX = "local.hass.io"
LABEL_ARCH = "io.hass.arch"

3
supervisor/docker/addon.py
View File

@ -14,6 +14,7 @@ import requests
from ..addons.build import AddonBuild
from ..const import (
DOCKER_CPU_RUNTIME_ALLOCATION,
ENV_TIME,
ENV_TOKEN,
ENV_TOKEN_HASSIO,
@ -285,7 +286,7 @@ class DockerAddon(DockerInterface):
# If need CPU RT
if self.addon.with_realtime:
return 950000
return DOCKER_CPU_RUNTIME_ALLOCATION
return None
@property

4
supervisor/docker/audio.py
View File

@ -4,7 +4,7 @@ from typing import Dict, List, Optional
import docker
from ..const import ENV_TIME, MACHINE_ID
from ..const import DOCKER_CPU_RUNTIME_ALLOCATION, ENV_TIME, MACHINE_ID
from ..coresys import CoreSysAttributes
from ..docker.const import Capabilities
from ..hardware.const import PolicyGroup
@ -67,7 +67,7 @@ class DockerAudio(DockerInterface, CoreSysAttributes):
"""Limit CPU real-time runtime in microseconds."""
if not self.sys_docker.info.support_cpu_realtime:
return None
return 950000
return DOCKER_CPU_RUNTIME_ALLOCATION
def _run(self) -> None:
"""Run Docker image.