broadwaylamb marked an inline comment as done.
broadwaylamb added inline comments.
================
Comment at: llvm/lib/Support/TimeProfiler.cpp:266
+ const auto BeginningOfTimeUs = SystemTime - ProcessLocalTime;
+ J.attribute("beginningOfTime",
+ BeginningOfTimeUs.time_since_epoch().count());
----------------
MaskRay wrote:
> What is the logic here?
>
> Two events in the same process may have different `beginningOfTime`. Is that
> intended?
>
> Noe that `system_clock::now()` and `steady_clock::now()` are not measured at
> the same time.
>Two events in the same process may have different beginningOfTime. Is that
>intended?
How would that be possible? We only compute `beginningOfTime` when writing the
data of the time profiler to a JSON file. AFAICT it happens only once. So, this
code is only called once.
>Noe that system_clock::now() and steady_clock::now() are not measured at the
>same time.
I understand. But the difference should be very small (certainly less than a
microsecond), since there are only a few arithmetic operations in between.
Repository:
rG LLVM Github Monorepo
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https://reviews.llvm.org/D78030/new/
https://reviews.llvm.org/D78030
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