I wrote a new read-lock implementation that's optimized for uncontended multi-reader or single writer usecases. It's really meant for large in-memory data structures that are read-mostly, with occasional updates. As such, it should be benchmarked with big-iron type hardware. I'm also interested to see how it does on non-intel hardware (both correctness and performance). Locking is also a very OS dependent thing (threads, parking, etc), so having data on that would be awesome too.
Unfortunately, I don't have big-iron hardware. Something like a 32+ core Xeon setup, or even an AMD threadripper would be interesting to see.
So I'm asking for help from the community. If you have about 8 minutes and want to help, please follow these directions:
git clone https://github.com/mohrezaei/widerwlock
cd widerwlock
cargo test
cargo test --release
cargo +nightly bench
And post your results in this thread. Please note your CPU, OS and rust toolchain. Here are my results:
intel i7-7700K, Windows 10, nightly-x86_64-pc-windows-msvc
test bench_2_reader_grwl ... bench: 12,035,099 ns/iter (+/- 1,851,445)
test bench_2_reader_pk ... bench: 28,803,382 ns/iter (+/- 423,200)
test bench_2_reader_std ... bench: 28,386,442 ns/iter (+/- 1,316,308)
test bench_4_reader_grwl ... bench: 14,991,882 ns/iter (+/- 5,051,984)
test bench_4_reader_pk ... bench: 58,448,153 ns/iter (+/- 837,085)
test bench_4_reader_std ... bench: 56,011,028 ns/iter (+/- 1,106,178)
test bench_8_reader_grwl ... bench: 21,986,720 ns/iter (+/- 4,930,849)
test bench_8_reader_pk ... bench: 128,697,642 ns/iter (+/- 4,848,127)
test bench_8_reader_std ... bench: 108,676,567 ns/iter (+/- 2,381,390)
test bench_mixed_hundreth_work10_1_grwl ... bench: 26,082,803 ns/iter (+/- 1,373,453)
test bench_mixed_hundreth_work10_1_pk ... bench: 20,867,510 ns/iter (+/- 1,788,476)
test bench_mixed_hundreth_work10_1_std ... bench: 23,517,335 ns/iter (+/- 1,168,930)
test bench_mixed_hundreth_work10_4_grwl ... bench: 70,482,765 ns/iter (+/- 5,733,574)
test bench_mixed_hundreth_work10_4_pk ... bench: 94,416,212 ns/iter (+/- 5,646,173)
test bench_mixed_hundreth_work10_4_std ... bench: 101,117,698 ns/iter (+/- 3,081,084)
test bench_mixed_tenth_work100_4_grwl ... bench: 29,531,374 ns/iter (+/- 1,187,823)
test bench_mixed_tenth_work100_4_pk ... bench: 32,086,846 ns/iter (+/- 1,075,212)
test bench_mixed_tenth_work100_4_std ... bench: 40,456,188 ns/iter (+/- 704,694)
test bench_mixed_tenth_work10_1_grwl ... bench: 27,482,565 ns/iter (+/- 2,266,590)
test bench_mixed_tenth_work10_1_pk ... bench: 20,712,666 ns/iter (+/- 184,322)
test bench_mixed_tenth_work10_1_std ... bench: 23,800,789 ns/iter (+/- 584,405)
test bench_mixed_tenth_work10_4_grwl ... bench: 220,569,891 ns/iter (+/- 6,972,154)
test bench_mixed_tenth_work10_4_pk ... bench: 94,027,579 ns/iter (+/- 4,944,653)
test bench_mixed_tenth_work10_4_std ... bench: 102,399,700 ns/iter (+/- 4,858,920)
test bench_uncontended_mutex ... bench: 15,171,497 ns/iter (+/- 118,918)
test bench_uncontended_read_grwl ... bench: 9,596,682 ns/iter (+/- 126,181)
test bench_uncontended_read_pk ... bench: 14,058,431 ns/iter (+/- 126,530)
test bench_uncontended_read_std ... bench: 13,382,540 ns/iter (+/- 146,634)
test bench_uncontended_write_grwl ... bench: 10,114,534 ns/iter (+/- 531,415)
test bench_uncontended_write_pk ... bench: 8,028,946 ns/iter (+/- 38,759)
test bench_uncontended_write_std ... bench: 14,276,519 ns/iter (+/- 163,786)
test bench_work10 ... bench: 10 ns/iter (+/- 0)
test bench_work100 ... bench: 102 ns/iter (+/- 3)
Thanks a lot 