Especially on windows, direct output to `cout` via `<<` is very expensive.
Instead, use fmtlib to do all formatting into a no-alloc `fmt::memory_buffer`,
and output that with one call to `cout`.
timeit utilities are not used much by default, but during development or
profiling one often uncomments macros like `DEBUG_TIME` that then enable
`SCOPED_TIMER` or `SCOPED_TIMER_AVERAGED`.
Having one `SCOPED_TIMER_AVERAGED` inside sequencer `draw_channels`, with
empty timeline and all default channels; the overhead in % of `draw_channels`
duration of said scoped timer before and after this change:
- Windows: 29% -> 5%
- Mac: 5.0% -> 4.4%
Pull Request: https://projects.blender.org/blender/blender/pulls/115233
When using `SCOPED_TIMER` or `SCOPED_TIMER_AVERAGED`
the display would switch from ns to ms
once the value is over 0.1 ms with a precision of 1.
So when the timer value is hovering in the range of 0.1 - 0.2 ms it is
not giving any useful information.
Fix this by adding another digit to the precision of ms.
Pull Request: https://projects.blender.org/blender/blender/pulls/114724
Listing the "Blender Foundation" as copyright holder implied the Blender
Foundation holds copyright to files which may include work from many
developers.
While keeping copyright on headers makes sense for isolated libraries,
Blender's own code may be refactored or moved between files in a way
that makes the per file copyright holders less meaningful.
Copyright references to the "Blender Foundation" have been replaced with
"Blender Authors", with the exception of `./extern/` since these this
contains libraries which are more isolated, any changed to license
headers there can be handled on a case-by-case basis.
Some directories in `./intern/` have also been excluded:
- `./intern/cycles/` it's own `AUTHORS` file is planned.
- `./intern/opensubdiv/`.
An "AUTHORS" file has been added, using the chromium projects authors
file as a template.
Design task: #110784
Ref !110783.
A lot of files were missing copyright field in the header and
the Blender Foundation contributed to them in a sense of bug
fixing and general maintenance.
This change makes it explicit that those files are at least
partially copyrighted by the Blender Foundation.
Note that this does not make it so the Blender Foundation is
the only holder of the copyright in those files, and developers
who do not have a signed contract with the foundation still
hold the copyright as well.
Another aspect of this change is using SPDX format for the
header. We already used it for the license specification,
and now we state it for the copyright as well, following the
FAQ:
https://reuse.software/faq/
Many existing importers/exporters do log the time it takes to system
console (some others log more information too). In particular, OBJ
(C++ & python), STL (C++ & python), PLY, glTF2 all log the time it
takes. However, neither USD nor Alembic do. And also it's harder to
know the time it takes there from a profiler, since all the work
normally is done on a background job and is split between several
threads (so you can't just find some top-level function and see how
much time it took).
This change:
- Adds import/export time logging to USD & Alembic importer/exporter,
- In the time utility class (also used by OBJ & STL), improve the
output formatting: 1) print only one decimal digit, 2) for long
times, print seconds and also produce a hours:minutes:seconds form.
Reviewed By: Michael Kowalski, Kévin Dietrich
Differential Revision: https://developer.blender.org/D15170
This is useful to save time manually averaging many timing results.
The minimum is included because often it can be more stable than an
average, and it can help to expose calls from other contexts with lower
times that would make the average useless.
Differential Revision: https://developer.blender.org/D14417
Use a shorter/simpler license convention, stops the header taking so
much space.
Follow the SPDX license specification: https://spdx.org/licenses
- C/C++/objc/objc++
- Python
- Shell Scripts
- CMake, GNUmakefile
While most of the source tree has been included
- `./extern/` was left out.
- `./intern/cycles` & `./intern/atomic` are also excluded because they
use different header conventions.
doc/license/SPDX-license-identifiers.txt has been added to list SPDX all
used identifiers.
See P2788 for the script that automated these edits.
Reviewed By: brecht, mont29, sergey
Ref D14069
This adds a simple timer that can be used for performance measurements in C++.
More sophisticated timers are possible (e.g. one that takes averages, logs the results, ...).
However, I found that this simple timer is good enough for 99% of my use cases.
To use it just write `SCOPED_TIMER("my timer name");` or more commonly `SCOPED_TIMER(__func__);`
into some scope.
Reviewers: sergey
Differential Revision: https://developer.blender.org/D7491
