Ray Tracing in a week-end - Julia vs SIMD-optimized C++

General Usage Performance
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my link had a typo, an admin fixed it but it broke the link :slight_smile:

I had bad C++ compiler flags and that version now runs in about 1 minute, not 9

So my single threaded Julia, at 2m30s is now not so good as I thought.

but the code is well suited to multi-threading

10 threads at 27s real and 20 threads take 17s real and 40 threads (my max) take 15s real - so clearly it is not a linear speedup.

julia> versioninfo()
Julia Version 1.7.0
Commit 3bf9d17731 (2021-11-30 12:12 UTC)
Platform Info:
  OS: Linux (x86_64-pc-linux-gnu)
  CPU: Intel(R) Xeon(R) CPU E5-2660 v3 @ 2.60GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-12.0.1 (ORCJIT, haswell)
Environment:
  JULIA_CPU_THREADS = 40
  JULIA_NUM_THREADS = 40

It has two physical CPUs

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