James O'Beirne 58180b5fd4 tests: add utility to easily profile node performance with perf
Introduces `TestNode.profile_with_perf()` context manager which
samples node execution to produce profiling data.

Also introduces a test framework flag, `--perf`, which will run
perf on all nodes for the duration of a given test.
2019-01-22 08:55:55 -05:00
..
2018-07-27 07:15:02 -04:00
2018-07-27 07:15:02 -04:00
2018-11-07 18:07:49 +01:00