[test] change memory sampling interval to 0.1 on benchmarks

1 files changed, 44 insertions, 0 deletions

diff --git a/testing/tests/benchmarks/README.md b/testing/tests/benchmarks/README.md
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+Benchmark tests
+===============
+
+This folder contains benchmark tests for Soledad. It aims to provide a fair
+account on the time and resources taken to perform some actions.
+
+These benchmarks are built on top of `pytest-benchmark`, a `pytest` fixture that
+provides means for running test functions multiple times and generating
+reports. The results are printed to screen and also posted to elasticsearch.
+
+`pytest-benchmark` runs tests multiple times so it can provide meaningful
+statistics for the time taken for a tipical run of a test function. The number
+of times that the test is run can be manually or automatically configured. When
+automatically configured, the number of runs is decided by taking into account
+multiple `pytest-benchmark` configuration parameters. See the following page
+for more details on how `pytest-benchmark` works:
+
+  https://pytest-benchmark.readthedocs.io/en/stable/calibration.html
+
+Some graphs and analysis resulting from these tests can be seen on:
+
+  https://benchmarks.leap.se/
+
+
+Resource consumption
+--------------------
+
+For each test, CPU and memory usage statistics are also collected, by querying
+`cpu_percent()` and `memory_percent()` from `psutil.Process` for the current
+test process. Some notes about the current resource consumption estimation process:
+
+* Currently, resources are measured for the whole set of rounds that a test
+  function is run. That means that the CPU and memory percentage include the
+  `pytest` and `pytest-benchmark` machinery overhead. Anyway, for now this might
+  provide a fair approximation of per-run test function resource usage.
+
+* CPU is measured before and after the run of the benchmark function and
+  returns the percentage that the currnet process occupied of the CPU time
+  between the two calls.
+
+* Memory is sampled during the benchmark run by a separate thread. Sampling
+  interval might have to be configured on a per-test basis, as different tests
+  take different times to execute (from milliseconds to tens of seconds). For
+  now, an interval of 0.1s seems to cover all tests.