Aliaksandr Valialkin
109772bdc4
lib/cgroup: round GOMAXPROCS to the lower integer value of cpuQuota
...
Rounding GOMAXPROCS to the upper interger value of cpuQuota increases chances of CPU starvation,
non-optimimal goroutine scheduling and additional CPU overhead related to context switching.
So it is better to round GOMAXPROCS to the lower integer value of cpuQuota.
2024-09-23 16:09:12 +02:00
Aliaksandr Valialkin
de9a9546c2
lib/cgroup: remove SetGOGC() function
...
GOGC can be already set via environment variable. There is no need in adding
new approaches for setting the GOGC (such as command-line flag), since they complicate operations.
2024-02-05 12:11:08 +02:00
Aliaksandr Valialkin
3409317a67
lib/cgroup: add SetGOGC() function
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This function is going to be used by VictoriaLogs
2023-06-19 22:39:00 -07:00
Aliaksandr Valialkin
9f94c295ab
all: use os.{Read|Write}File instead of ioutil.{Read|Write}File
...
The ioutil.{Read|Write}File is deprecated since Go1.16 -
see https://tip.golang.org/doc/go1.16#ioutil
VictoriaMetrics needs at least Go1.18, so it is safe to remove ioutil usage
from source code.
This is a follow-up for 02ca2342ab
2022-08-21 23:52:35 +03:00
Aliaksandr Valialkin
077193d87c
lib/cgroup: reduce the default GOGC value from 50% to 30%
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This reduces memory usage under production workloads by up to 10%,
while CPU spent on GC remains roughly the same.
The CPU spent on GC can be monitored with go_memstats_gc_cpu_fraction metric
2022-04-06 13:32:07 +03:00
Aliaksandr Valialkin
f50cf60534
lib/cgroup: fall back to runtime.NumCPU() when determining process_cpu_cores_available metric if it is impossible to determine cpu quota via cgroups
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Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/2107
2022-01-31 20:30:14 +02:00
Aliaksandr Valialkin
ead66155ef
lib/cgroup: expose process_cpu_cores_available metric
...
This metric shows the number of CPU cores available to the process.
This allows creating alerting rules on CPU saturation with the following query:
rate(process_cpu_seconds_total[5m]) / process_cpu_cores_available > 0.9
Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/2107
2022-01-31 20:24:41 +02:00
Aliaksandr Valialkin
54b9e1d3cb
lib/cgroup: set GOGC to 50 by default if it isn't set
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This should reduce memory usage for typical VictoriaMetrics workloads by up to 50%
2021-07-05 15:16:11 +03:00
Aliaksandr Valialkin
c0ec541559
lib/cgroup: document the ability to detect cgroup v2 memory and cpu limits. This is follow-up for b50024812e
2021-05-13 09:26:20 +03:00
Nikolay
b50024812e
adds cgroupsv2 support ( #1283 )
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* adds cgroupv2 limits support
https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1269
* small fix
* changes Atoi to ParseUint
2021-05-13 09:02:13 +03:00
Aliaksandr Valialkin
c5770600a2
lib/cgroup: follow-up after b9bf3cbe3e
2021-02-08 15:54:38 +02:00
Nikolay
b9bf3cbe3e
refactored cgroups limits, ( #1061 )
...
adds tests, remove os.Exec
2021-02-08 15:46:22 +02:00
Aliaksandr Valialkin
4146fc4668
all: properly handle CPU limits set on the host system/container
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This can reduce memory usage on systems with enabled CPU limits.
Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/946
2020-12-08 21:07:29 +02:00
Aliaksandr Valialkin
76b244cfcf
lib/cgroup: do not adjust the number of detected CPU cores via /sys/devices/system/cpu/online
...
The adjustement increases the resulting GOMAXPROC by 1, which looks confusing to users
as outlined at https://github.com/VictoriaMetrics/VictoriaMetrics/issues/685#issuecomment-698595309
2020-09-29 13:55:26 +03:00
Aliaksandr Valialkin
5c42965853
lib/cgroup: attempt to obtain available CPU cores via /sys/devices/system/cpu/online
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See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/685#issuecomment-674423728
2020-09-22 23:27:19 +03:00
Aliaksandr Valialkin
be6ae4b5e7
lib/memory: fall back to reading hierarchical memory limit in cgroups when the default limit isn't set
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Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/699
2020-09-04 00:05:05 +03:00
Aliaksandr Valialkin
f4c4ab811b
lib/cgroup: limit the maximum GOMAXPROCS value to the number of available CPU cores
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There is no sense in setting GOMAXPROCS to value higher than the number of available CPU cores.
2020-08-28 09:49:32 +03:00
Aliaksandr Valialkin
ef7e2af8f5
app: respect CPU limits set via cgroups
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Update GOMAXPROCS to limits set via cgroups. This should reduce CPU trashing and reduce memory usage
for cases when VictoriaMetrics components run in containers with CPU limits.
See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/685
2020-08-11 22:59:19 +03:00
