f7b54703d0
This improves the spectralnorm shootout benchmark through a few vectors after looking at the leading C implementation: * The simd-based f64x2 is now used to parallelize a few computations * RWLock usage has been removed. A custom `parallel` function was added as a form of stack-based fork-join parallelism. I found that the contention on the locks was high as well as hindering other optimizations. This does, however, introduce one `unsafe` block into the benchmarks, which previously had none. In terms of timings, the before and after numbers are: ``` $ time ./shootout-spectralnorm-before ./shootout-spectralnorm-before 2.07s user 0.71s system 324% cpu 0.857 total $ time ./shootout-spectralnorm-before 5500 ./shootout-spectralnorm-before 5500 11.88s user 1.13s system 459% cpu 2.830 total $ time ./shootout-spectralnorm-after ./shootout-spectralnorm-after 0.58s user 0.01s system 280% cpu 0.210 tota $ time ./shootout-spectralnorm-after 5500 ./shootout-spectralnorm-after 5500 3.55s user 0.01s system 455% cpu 0.783 total ``` |
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| .. | ||
| auxiliary | ||
| bench | ||
| codegen | ||
| compile-fail | ||
| compile-fail-fulldeps | ||
| debuginfo | ||
| pretty | ||
| run-fail | ||
| run-make | ||
| run-pass | ||
| run-pass-fulldeps | ||