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153881bdae
* Add resctrl collector Expose the Linux resctrl monitoring counters (Intel RDT, AMD PQoS, ARM MPAM): per L3 domain memory bandwidth (mbm_total_bytes, mbm_local_bytes) and last level cache occupancy (llc_occupancy). Parsing is done by the procfs resctrlfs package (procfs v0.22.0). The collector is disabled by default because the resctrl filesystem must be mounted first (mount -t resctrl resctrl /sys/fs/resctrl). The mountpoint is configurable via --collector.resctrl.path. Counters a CPU does not support (for example mbm_local_bytes on Arm MPAM) or that read "Unavailable" are skipped per sample. The hardware counters wrap; Prometheus treats the wrap as a counter reset, so no correction is applied. Signed-off-by: René Treffer <treffer@measite.de> * Describe steps needed to use the resctrl exporter Signed-off-by: René Treffer <treffer@measite.de> * Shorten resctrl documentation Signed-off-by: René Treffer <treffer@measite.de> --------- Signed-off-by: René Treffer <treffer@measite.de>
92 lines
2.7 KiB
Go
92 lines
2.7 KiB
Go
// Copyright The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//go:build !noresctrl
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package collector
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import (
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"io"
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"log/slog"
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"strings"
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"testing"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/client_golang/prometheus/testutil"
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)
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type testResctrlCollector struct {
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rc Collector
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}
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func (c testResctrlCollector) Collect(ch chan<- prometheus.Metric) {
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c.rc.Update(ch)
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}
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func (c testResctrlCollector) Describe(ch chan<- *prometheus.Desc) {
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prometheus.DescribeByCollect(c, ch)
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}
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func newTestResctrlCollector(logger *slog.Logger) (prometheus.Collector, error) {
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rc, err := NewResctrlCollector(logger)
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if err != nil {
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return testResctrlCollector{}, err
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}
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return testResctrlCollector{rc}, nil
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}
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func TestResctrlMetrics(t *testing.T) {
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*resctrlPath = "fixtures/resctrl"
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// Domain 1 reports "Unavailable" for mbm_local_bytes, so that sample is
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// absent.
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testcase := `# HELP node_resctrl_llc_occupancy_bytes Last level cache bytes occupied in this domain.
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# TYPE node_resctrl_llc_occupancy_bytes gauge
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node_resctrl_llc_occupancy_bytes{domain="0"} 4.4040192e+07
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node_resctrl_llc_occupancy_bytes{domain="1"} 8.388608e+06
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# HELP node_resctrl_memory_bandwidth_bytes_total Bytes moved between the last level cache and memory. scope=total includes remote sockets, scope=local is memory attached to this domain.
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# TYPE node_resctrl_memory_bandwidth_bytes_total counter
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node_resctrl_memory_bandwidth_bytes_total{domain="0",scope="local"} 2.10196273664e+11
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node_resctrl_memory_bandwidth_bytes_total{domain="0",scope="total"} 3.15294410752e+11
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node_resctrl_memory_bandwidth_bytes_total{domain="1",scope="total"} 1.05098136832e+11
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`
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logger := slog.New(slog.NewTextHandler(io.Discard, nil))
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c, err := newTestResctrlCollector(logger)
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if err != nil {
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t.Fatal(err)
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}
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if err := testutil.CollectAndCompare(c, strings.NewReader(testcase)); err != nil {
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t.Fatal(err)
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}
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}
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func TestResctrlNotMounted(t *testing.T) {
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*resctrlPath = t.TempDir()
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logger := slog.New(slog.NewTextHandler(io.Discard, nil))
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c, err := NewResctrlCollector(logger)
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if err != nil {
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t.Fatal(err)
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}
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ch := make(chan prometheus.Metric, 16)
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err = c.Update(ch)
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close(ch)
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if err != ErrNoData {
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t.Fatalf("expected ErrNoData, got %v", err)
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}
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}
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