[test] Import changes to port sharedmem tables into OCaml 5.2 domain-based parallelism #926
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... and also fix some script shebangs
Since some of these tests are parallel themselves, I don't want to put to much load on the system, which might (?) artificially degrade the measurements.
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Folks at Tarides have already experimented with porting Pyre's multi-processing sharedmem library into relying on OCaml5's domain-based multi-threading mechanism.
I'm creating this PR so we have an easy way of importing the changes into Meta's internal repository. Please do not accept this change -- it's likely to require some cleanup work. But we should start experimenting & benchmarking with it and see how much perf gain we could reap (and hopefully report the numbers back to the original author).