path_tracer | Experimental path tracing with C20 and SYCL | Game Engine library

by triSYCL C++ Version: Current License: Apache-2.0

X-Ray Key Features Code Snippets Community Discussions(1)Vulnerabilities Install Support

kandi X-RAY | path_tracer Summary

path_tracer is a C++ library typically used in Gaming, Game Engine applications. path_tracer has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. You can download it from GitHub.

Experimental path tracing with C++20 and SYCL

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Quality

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Support

path_tracer has a low active ecosystem.

It has 8 star(s) with 4 fork(s). There are 11 watchers for this library.

It had no major release in the last 6 months.

There are 4 open issues and 6 have been closed. On average issues are closed in 15 days. There are 2 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of path_tracer is current.

Quality

path_tracer has no bugs reported.

Security

path_tracer has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

License

path_tracer is licensed under the Apache-2.0 License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

path_tracer releases are not available. You will need to build from source code and install.

Installation instructions are not available. Examples and code snippets are available.

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path_tracer Key Features

No Key Features are available at this moment for path_tracer.

path_tracer Examples and Code Snippets

No Code Snippets are available at this moment for path_tracer.

Community Discussions

Trending Discussions on path_tracer

Initializing std::vector outside of main() causes performance drop (multithreading)

QUESTION

Initializing std::vector outside of main() causes performance drop (multithreading)

Asked 2020-Jul-09 at 17:45

I'm writing a path tracer as a programming exercise. Yesterday I finally decided to implement multithreading - and it worked well. However, once I wrapped the test code I wrote inside main() in a separate renderer class, I noticed a significant and consistent performance drop. In short - it would seem that filling std::vector anywhere outside of main() causes threads using its elements to perform worse. I managed to isolate and reproduce the issue with simplified code, but unfortunately I still don't know why it happens or what to do in order to fix it.

Performance drop is quite visible and consistent:

...

ANSWER

Answered 2020-Jul-09 at 17:45

There is a race condition with foo::buf - one thread makes stores into it, anther reads it. This is undefined behaviour, but on x86-64 platform that is harmless in this particular code.

I cannot reproduce your observations on Intel i9-9900KS, both variants print the same per sample stats.

Compiled with gcc-8.4, g++ -o release/gcc/test.o -c -pthread -m{arch,tune}=native -std=gnu++17 -g -O3 -ffast-math -falign-{functions,loops}=64 -DNDEBUG test.cc

With int N = 50000000; each thread operates on its own array of float[N] which occupies 200MB. Such a data set doesn't fit in CPU caches and the program incurs a lot of data cache misses because it needs to fetch the data from memory:

Source https://stackoverflow.com/questions/62818038

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

No vulnerabilities reported

Install path_tracer

You can download it from GitHub.

Support

For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .

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