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

790 B

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