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std: add warm up phase to benchmark

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In my tests, whatever ran first was getting much better numbers.
Additionally, add alignment requirements so that comparison is fair.
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daurnimator 2019-12-28 14:23:27 +11:00
parent a81c0ba2e7
commit 8b72eedc76
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1 changed files with 7 additions and 2 deletions
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9
lib/std/unicode/throughput_test.zig
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@ -6,18 +6,23 @@ pub fn main() !void {
const args = try std.process.argsAlloc(std.heap.page_allocator);
// Warm up runs
var buffer0: [32767]u16 align(4096) = undefined;
_ = try std.unicode.utf8ToUtf16Le(&buffer0, args[1]);
_ = try std.unicode.utf8ToUtf16Le_better(&buffer0, args[1]);
@fence(.SeqCst);
var timer = try std.time.Timer.start();
@fence(.SeqCst);
var buffer1: [32767]u16 = undefined;
var buffer1: [32767]u16 align(4096) = undefined;
_ = try std.unicode.utf8ToUtf16Le(&buffer1, args[1]);
@fence(.SeqCst);
const elapsed_ns_orig = timer.lap();
@fence(.SeqCst);
var buffer2: [32767]u16 = undefined;
var buffer2: [32767] u16 align(4096) = undefined;
_ = try std.unicode.utf8ToUtf16Le_better(&buffer2, args[1]);
@fence(.SeqCst);