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| -rw-r--r-- | src/test/bench/task-perf-jargon-metal-smoke.rs | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/src/test/bench/task-perf-jargon-metal-smoke.rs b/src/test/bench/task-perf-jargon-metal-smoke.rs new file mode 100644 index 00000000000..c2e25c5e5e3 --- /dev/null +++ b/src/test/bench/task-perf-jargon-metal-smoke.rs @@ -0,0 +1,32 @@ +// Test performance of a task "spawn ladder", in which children task have many +// many ancestor taskgroups, but with only a few such groups alive at a time. +// Each child task has to enlist as a descendant in each of its ancestor +// groups, but that shouldn't have to happen for already-dead groups. +// +// The filename is a reference; google it in quotes. + +fn child_generation(gens_left: uint) { + // This used to be O(n^2) in the number of generations that ever existed. + // With this code, only as many generations are alive at a time as tasks + // alive at a time, + do task::spawn_supervised { + if gens_left & 1 == 1 { + task::yield(); // shake things up a bit + } + if gens_left > 0 { + child_generation(gens_left - 1); // recurse + } + } +} + +fn main(args: ~[~str]) { + let args = if os::getenv(~"RUST_BENCH").is_some() { + ~[~"", ~"100000"] + } else if args.len() <= 1u { + ~[~"", ~"100"] + } else { + copy args + }; + + child_generation(uint::from_str(args[1]).get()); +} |