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jonathanstrong friedroman goirad raygon-renderer xguerin icodein

clocksource's Issues

Release Request

Would it be possible to have a new release of clocksource?

possible to convert these clock readings to a time?

hey -

Perhaps this should be obvious but to me it is not. How can I convert these clock readings to represent the number of nanoseconds since 1970? Is that possible? Perhaps they are only for timing things but would be nice to get a more precise and fast time out of it as part of the same deal.

Thanks!

Swapping in clocks calibrated off thread

hey,

I spent a couple hours tonight trying to work up a struct interface to a thread that periodically calibrates a Clocksource and sends clones around to any subscribing threads. However, I was surprised to find that neither of two approaches I tried ended up being faster than calling std::time::SystemTime::now(). It seems that the overhead of concurrency is more costly than the marginal speedup of rdtsc.

This branch has the code. Would be interested in any thoughts you have. Happy to eventually submit as a pull request if you'd like but figured I would check in first since 1) it didn't work quite as expected, 2) no idea if you want something like this in the library.

Here are some bench results:

i7 laptop:

$ RUSTFLAGS="-C target-cpu=native" cargo bench
# ...
running 11 tests
test tests::test_raw ... ignored
test tests::test_reference ... ignored
test tests::test_source ... ignored
test calibrator::tests::calibrates_a_realtime_counter_clocksource       ... ignored
test calibrator::tests::cloning_a_clocksource                           ... bench:           1 ns/iter (+/- 0)
test calibrator::tests::mpsc_calibrator_hot_path_loop_overhead          ... bench:          28 ns/iter (+/- 1)
test calibrator::tests::triple_buffer_calibrator_hot_path_loop_overhead ... bench:          28 ns/iter (+/- 3)
test tests::calls_rdtsc_directly                                        ... bench:          11 ns/iter (+/- 0)
test tests::calls_std_instant_now                                       ... bench:          20 ns/iter (+/- 1)
test tests::calls_std_system_time_now                                   ... bench:          20 ns/iter (+/- 0)
test tests::it_creates_a_duration                                       ... bench:           1 ns/iter (+/- 0)

xeon server:

$ RUSTFLAGS="-C target-cpu=native" cargo bench
# ...
running 11 tests
test tests::test_raw ... ignored
test tests::test_reference ... ignored
test tests::test_source ... ignored
test calibrator::tests::calibrates_a_realtime_counter_clocksource       ... ignored
test calibrator::tests::cloning_a_clocksource                           ... bench:           1 ns/iter (+/- 0)
test calibrator::tests::mpsc_calibrator_hot_path_loop_overhead          ... bench:          35 ns/iter (+/- 0)
test calibrator::tests::triple_buffer_calibrator_hot_path_loop_overhead ... bench:          28 ns/iter (+/- 0)
test tests::calls_rdtsc_directly                                        ... bench:          14 ns/iter (+/- 0)
test tests::calls_std_instant_now                                       ... bench:          25 ns/iter (+/- 0)
test tests::calls_std_system_time_now                                   ... bench:          25 ns/iter (+/- 3)
test tests::it_creates_a_duration                                       ... bench:           1 ns/iter (+/- 0)

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