zobench

Zobench is a simple benchmark library for Zig. It's inspired by Go's testing.B.

Example

fn benchmarkAssign(b: *State) !void {
    // Expensive setup
    b.resetTimer();

    var i: usize = 0;
    while (i < b.n) : (i += 1) {
        i = i;
    }
}

test "runN" {
    const result = try runN(benchmarkAssign, 10);
    try std.testing.expect(result.n == 10);

    std.debug.print("\n{} ops / {} ns = {d:.3} ns/op\n", .{ result.n, result.ns, result.nsPerOp() });
}

test "runNs" {
    const result = try runNs(benchmarkAssign, std.time.ns_per_s);
    try std.testing.expect(result.ns >= std.time.ns_per_s);

    std.debug.print("\n{} ops / {} ns = {d:.3} ns/op\n", .{ result.n, result.ns, result.nsPerOp() });
}

fn benchmarkAlloc(b: *State) !void {
    var allocator = b.allocator();

    // Expensive setup

    b.resetTimer();

    var i: usize = 0;
    while (i < b.n) : (i += 1) {
        const p = try allocator.create(u64);
        if (i % 2 == 0) {
            allocator.destroy(p);
        }
    }
}

test "leak" {
    const result = try runN(benchmarkAlloc, 10);

    std.debug.print("\n{d:.3} allocs/op, {d:.3} bytes/op\n", .{ result.allocsPerOp(), result.allocMemPerOp() });
    if (result.mem > 0) {
        std.debug.print("LEAKED {} BYTES!\n", .{result.mem});
    }
}

Output:

Test [1/3] test.runN...
10 ops / 200 ns = 20.000 ns/op
Test [2/3] test.runNs...
927815920 ops / 1154363300 ns = 1.244 ns/op
Test [3/3] test.alloc...
1.000 allocs/op, 8.000 bytes/op
LEAKED 40 BYTES!