Cached benchmark file I/O - #1700
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ASV BenchmarkingBenchmark Comparison ResultsBenchmarks that have improved:
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asv preimports the benchmark suite before it runs any setup_cache (asv/runner.py, spawner.preimport() ahead of the run loop), so on a cold cache bench_connectivity's import-time preload_topologies is what fills it -- serially, in the forkserver parent, before a single benchmark starts. CachedFixtures.setup_cache then finds everything already built, and prime(workers=...) never runs on the path it was written for. Filling it from the CLI first puts those reads back in the parallel prime. Worth a second or two on the GitHub runners, which only see the oQU grids; worth rather more on a machine that can reach the four dyamond grids on campaign storage. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Closes #1698
Overview
This PR is a large-scale overhaul of the benchmarks to support single-loads of files per benchmark suite.
Currently, the ASV benchmark suite runs a new process per benchmark, requiring full-scale loads of files for every single benchmark. There are a limited number of files that are actually used to benchmark, so we end up loading many files dozens of times, running up wallclock time on the benchmark suite as a whole. This PR instead has a unified approach, where a parent process is launched for the whole benchmark suite, uncached files are retrieved into
/uxarray/benchmarks/_io_cache/, and benchmarks are spawned on forked processes that inherit visibility into the file cache and some other properties.Simultaneously, this reorganization of file I/O will help to expand the scope of what most non-I/O benchmarks are able to test, since some of them were artificially restricted to smaller grids. That raises another question about how many benchmarks really need to be run at every resolution, but I think that's out of scope for this PR, since it would alter the actual benchmark suite, rather than just changing how they are run.
General CI runs should see a wallclock improvement for whole benchmark suites. CI benchmark runs are showing improvements of about 19 minutes so far (38min -> 19min). Runs on HPC can expect larger improvements. Larger benchmark suites will benefit more from cached file I/O, while benchmarks run individually won't see much improvement.
Other general speed improvements:
This PR has merged in PR #1708 already, since it is a precondition for the optimizations here to be thread-safe.
PR Checklist
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Testing & Benchmarking
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AI Usage: Claude Opus 5