91 lines
4.2 KiB
Markdown
91 lines
4.2 KiB
Markdown
Scheduler Performance Test
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======
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Motivation
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------
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We already have a performance testing system -- Kubemark. However, Kubemark requires setting up and bootstrapping a whole cluster, which takes a lot of time.
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We want to have a standard way to reproduce scheduling latency metrics result and benchmark scheduler as simple and fast as possible. We have the following goals:
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- Save time on testing
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- The test and benchmark can be run in a single box.
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We only set up components necessary to scheduling without booting up a cluster.
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- Profiling runtime metrics to find out bottleneck
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- Write scheduler integration test but focus on performance measurement.
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Take advantage of go profiling tools and collect fine-grained metrics,
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like cpu-profiling, memory-profiling and block-profiling.
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- Reproduce test result easily
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- We want to have a known place to do the performance related test for scheduler.
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Developers should just run one script to collect all the information they need.
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Currently the test suite has the following:
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- density test (by adding a new Go test)
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- schedule 30k pods on 1000 (fake) nodes and 3k pods on 100 (fake) nodes
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- print out scheduling rate every second
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- let you learn the rate changes vs number of scheduled pods
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- benchmark
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- make use of `go test -bench` and report nanosecond/op.
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- schedule b.N pods when the cluster has N nodes and P scheduled pods. Since it takes relatively long time to finish one round, b.N is small: 10 - 100.
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How To Run
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------
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## Density tests
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```shell
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# In Kubernetes root path
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make test-integration WHAT=./test/integration/scheduler_perf KUBE_TEST_VMODULE="''" KUBE_TEST_ARGS="-alsologtostderr=true -logtostderr=true -run=." KUBE_TIMEOUT="--timeout=60m" SHORT="--short=false"
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```
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## Benchmark tests
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```shell
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# In Kubernetes root path
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make test-integration WHAT=./test/integration/scheduler_perf KUBE_TEST_VMODULE="''" KUBE_TEST_ARGS="-alsologtostderr=false -logtostderr=false -run=^$$ -benchtime=1ns -bench=BenchmarkPerfScheduling"
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```
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The benchmark suite runs all the tests specified under config/performance-config.yaml.
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Once the benchmark is finished, JSON file with metrics is available in the current directory (test/integration/scheduler_perf). Look for `BenchmarkPerfScheduling_YYYY-MM-DDTHH:MM:SSZ.json`.
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You can use `-data-items-dir` to generate the metrics file elsewhere.
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In case you want to run a specific test in the suite, you can specify the test through `-bench` flag:
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Also, bench time is explicitly set to 1ns (`-benchtime=1ns` flag) so each test is run only once.
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Otherwise, the golang benchmark framework will try to run a test more than once in case it ran for less than 1s.
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```shell
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# In Kubernetes root path
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make test-integration WHAT=./test/integration/scheduler_perf KUBE_TEST_VMODULE="''" KUBE_TEST_ARGS="-alsologtostderr=false -logtostderr=false -run=^$$ -benchtime=1ns -bench=BenchmarkPerfScheduling/SchedulingBasic/5000Nodes/5000InitPods/1000PodsToSchedule"
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```
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To produce a cpu profile:
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```shell
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# In Kubernetes root path
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make test-integration WHAT=./test/integration/scheduler_perf KUBE_TIMEOUT="-timeout=3600s" KUBE_TEST_VMODULE="''" KUBE_TEST_ARGS="-alsologtostderr=false -logtostderr=false -run=^$$ -benchtime=1ns -bench=BenchmarkPerfScheduling -cpuprofile ~/cpu-profile.out"
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```
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### How to configure benchmark tests
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Configuration file located under `config/performance-config.yaml` contains a list of templates.
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Each template allows to set:
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- node manifest
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- manifests for initial and testing pod
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- number of nodes, number of initial and testing pods
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- templates for PVs and PVCs
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- feature gates
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See `op` data type implementation in [scheduler_perf_test.go](scheduler_perf_test.go)
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for available operations to build `WorkloadTemplate`.
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Initial pods create a state of a cluster before the scheduler performance measurement can begin.
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Testing pods are then subject to performance measurement.
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The configuration file under `config/performance-config.yaml` contains a default list of templates to cover
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various scenarios. In case you want to add your own, you can extend the list with new templates.
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It's also possible to extend `op` data type, respectively its underlying data types
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to extend configuration of possible test cases.
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