Measure throughput of a single mutex with all threads contending. Do not
attempt to measure fairness/starvation.
The ChanContended benchmark works somewhat well for this (interacting
with the mutex is a large contributor to its results), but it's better
to be clear about what we're attempting to measure.
For #68578
Change-Id: Ie397b4c363bfcd5afddf796a81cd6c34ebf8551b
Reviewed-on: https://go-review.googlesource.com/c/go/+/604375 Reviewed-by: David Chase <drchase@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Michael Knyszek <mknyszek@google.com>
Auto-Submit: Rhys Hiltner <rhys.hiltner@gmail.com>