zig-dimal/src/benchmark.zig

672 lines
32 KiB
Zig

const std = @import("std");
const Io = std.Io;
const Tensor = @import("Tensor.zig").Tensor;
var io: Io = undefined;
pub fn main(init: std.process.Init) !void {
var stdout_buf: [4096]u8 = undefined;
var stdout_writer: std.Io.File.Writer = .init(.stdout(), init.io, &stdout_buf);
try stdout_writer.interface.print("Starting Benchmarks...", .{});
io = init.io;
// try vectorSIMDvsNative(f64, &stdout_writer.interface);
// try stdout_writer.flush();
// try vectorSIMDvsNative(f32, &stdout_writer.interface);
// try stdout_writer.flush();
// try vectorSIMDvsNative(i32, &stdout_writer.interface);
// try stdout_writer.flush();
// try vectorSIMDvsNative(i64, &stdout_writer.interface);
// try stdout_writer.flush();
// try vectorSIMDvsNative(i128, &stdout_writer.interface);
// try stdout_writer.flush();
//
// try bench_Scalar(&stdout_writer.interface);
// try stdout_writer.flush();
try bench_vsNative(&stdout_writer.interface);
try stdout_writer.flush();
// try bench_crossTypeVsNative(&stdout_writer.interface);
try stdout_writer.flush();
try bench_Vector(&stdout_writer.interface);
try stdout_writer.flush();
try bench_HighDimTensor(&stdout_writer.interface);
try stdout_writer.flush();
}
fn getTime() Io.Timestamp {
return Io.Clock.awake.now(io);
}
fn fold(comptime TT: type, s: *f64, v: TT) void {
s.* += if (comptime @typeInfo(TT) == .float)
@as(f64, @floatCast(v))
else
@as(f64, @floatFromInt(v));
}
fn bench_Scalar(writer: *std.Io.Writer) !void {
const ITERS: usize = 100_000;
const SAMPLES: usize = 10;
const getVal = struct {
fn f(comptime TT: type, i: usize, comptime mask: u7) TT {
const v: u8 = @as(u8, @truncate(i & @as(usize, mask))) + 1;
return if (comptime @typeInfo(TT) == .float) @floatFromInt(v) else @intCast(v);
}
}.f;
const Stats = struct {
median: f64,
delta: f64,
ops_per_sec: f64,
};
const computeStats = struct {
fn f(samples: []f64, iters: usize) Stats {
std.mem.sort(f64, samples, {}, std.sort.asc(f64));
const mid = samples.len / 2;
const median_ns = if (samples.len % 2 == 0) (samples[mid - 1] + samples[mid]) / 2.0 else samples[mid];
const low = samples[0];
const high = samples[samples.len - 1];
const delta_ns = (high - low) / 2.0;
const ns_per_op = median_ns / @as(f64, @floatFromInt(iters));
return .{
.median = ns_per_op,
.delta = (delta_ns / @as(f64, @floatFromInt(iters))),
.ops_per_sec = 1_000_000_000.0 / ns_per_op,
};
}
}.f;
try writer.print(
\\
\\ Scalar<T> benchmark — {d} iterations, {d} samples/cell
\\
\\┌───────────────────┬──────┬─────────────────────┬─────────────────────┐
\\│ Operation │ Type │ ns / op (± delta) │ Throughput (ops/s) │
\\├───────────────────┼──────┼─────────────────────┼─────────────────────┤
\\
, .{ ITERS, SAMPLES });
const Types = .{ i16, i32, i64, i128, i256, f32, f64 };
const TNames = .{ "i16", "i32", "i64", "i128", "i256", "f32", "f64" };
const Ops = .{ "add", "sub", "mul", "div", "to", "abs", "pow", "eq", "gt", "mul(n)" };
var results_matrix: [Ops.len][Types.len]f64 = undefined;
comptime var tidx: usize = 0;
inline for (Types, TNames) |T, tname| {
const M = Tensor(T, .{ .L = 1 }, .{}, &.{1});
const KM = Tensor(T, .{ .L = 1 }, .{ .L = .k }, &.{1});
const S = Tensor(T, .{ .T = 1 }, .{}, &.{1});
inline for (Ops, 0..) |op_name, oidx| {
var samples: [SAMPLES]f64 = undefined;
for (0..SAMPLES) |s_idx| {
const t_start = getTime();
for (0..ITERS) |i| {
std.mem.doNotOptimizeAway(
{
_ = if (comptime std.mem.eql(u8, op_name, "add"))
(M.splat(getVal(T, i, 63))).add(M.splat(getVal(T, i +% 7, 63)))
else if (comptime std.mem.eql(u8, op_name, "sub"))
(M.splat(getVal(T, i +% 10, 63))).sub(M.splat(getVal(T, i, 63)))
else if (comptime std.mem.eql(u8, op_name, "mul"))
(M.splat(getVal(T, i, 63))).mul(M.splat(getVal(T, i +% 1, 63)))
else if (comptime std.mem.eql(u8, op_name, "div"))
(M.splat(getVal(T, i +% 10, 63))).div(S.splat(getVal(T, i, 63)))
else if (comptime std.mem.eql(u8, op_name, "to"))
(KM.splat(getVal(T, i, 15))).to(M)
else if (comptime std.mem.eql(u8, op_name, "abs"))
(M.splat(getVal(T, i, 63))).abs()
else if (comptime std.mem.eql(u8, op_name, "eq"))
(M.splat(getVal(T, i, 63))).eq(M.splat(getVal(T, i +% 3, 63)))
else if (comptime std.mem.eql(u8, op_name, "gt"))
(M.splat(getVal(T, i, 63))).gt(M.splat(getVal(T, i +% 3, 63)))
else
(M.splat(getVal(T, i, 63))).mul(3);
},
);
}
const t_end = getTime();
samples[s_idx] = @as(f64, @floatFromInt(t_start.durationTo(t_end).toNanoseconds()));
}
const stats = computeStats(&samples, ITERS);
results_matrix[oidx][tidx] = stats.median;
try writer.print("│ {s:<17} │ {s:<4} │ {d:>8.2} ns ±{d:<6.2} │ {d:>19.0} │\n", .{ op_name, tname, stats.median, stats.delta, stats.ops_per_sec });
}
if (comptime tidx < Types.len - 1) {
try writer.print("├───────────────────┼──────┼─────────────────────┼─────────────────────┤\n", .{});
}
tidx += 1;
}
// Median Summary Table
try writer.print("└───────────────────┴──────┴─────────────────────┴─────────────────────┘\n\n", .{});
try writer.print("Median Summary (ns/op):\n", .{});
try writer.print("┌──────────────┬───────┬───────┬───────┬───────┬───────┬───────┬───────┐\n", .{});
try writer.print("│ Operation │ i16 │ i32 │ i64 │ i128 │ i256 │ f32 │ f64 │\n", .{});
try writer.print("├──────────────┼───────┼───────┼───────┼───────┼───────┼───────┼───────┤\n", .{});
inline for (Ops, 0..) |op_name, oidx| {
try writer.print("│ {s:<11} │", .{op_name});
var i: usize = 0;
while (i < Types.len) : (i += 1)
try writer.print("{d:>6.1} │", .{results_matrix[oidx][i]});
try writer.print("\n", .{});
}
try writer.print("└──────────────┴───────┴───────┴───────┴───────┴───────┴───────┴───────┘\n", .{});
}
fn bench_vsNative(writer: *std.Io.Writer) !void {
const ITERS: usize = 100_000;
const SAMPLES: usize = 100;
const getValT = struct {
fn f(comptime TT: type, i: usize) TT {
const v = (i % 100) + 1;
return if (comptime @typeInfo(TT) == .float) @floatFromInt(v) else @intCast(v);
}
}.f;
const Types = .{ f64, i64, i128, f32, f64 };
const TNames = .{ "f64", "i64", "i128", "f32", "f64" };
// Expanded Ops to match bench_Scalar
const Ops = .{ "add", "sub", "mul", "div", "abs", "eq", "gt" };
try writer.print(
\\
\\ Scalar vs Native Overhead Analysis
\\
\\┌───────────┬──────┬───────────┬───────────┬───────────┬───────────────────────┐
\\│ Operation │ Type │ Native │ @Vector │ Tensor{{1}} │ Slowdown Nat | Vec │
\\├───────────┼──────┼───────────┼───────────┼───────────┼───────────────────────┤
\\
, .{});
inline for (Ops, 0..) |op_name, j| {
inline for (Types, 0..) |T, tidx| {
var native_total_ns: f64 = 0;
var vector_total_ns: f64 = 0;
var tensor_total_ns: f64 = 0;
const M = Tensor(T, .{}, .{}, &.{1});
std.mem.doNotOptimizeAway({
for (0..SAMPLES) |_| {
// --- 1. Benchmark Native ---
const n_start = getTime();
const a = getValT(T, 10);
const b = getValT(T, 2);
for (0..ITERS) |_| {
// Native logic branch
_ = if (comptime std.mem.eql(u8, op_name, "add"))
if (comptime @typeInfo(T) == .int) a +| b else a + b
else if (comptime std.mem.eql(u8, op_name, "sub"))
if (comptime @typeInfo(T) == .int) a -| b else a - b
else if (comptime std.mem.eql(u8, op_name, "mul"))
if (comptime @typeInfo(T) == .int) a *| b else a * b
else if (comptime std.mem.eql(u8, op_name, "div"))
if (comptime @typeInfo(T) == .int) @divTrunc(a, b) else a / b
else if (comptime std.mem.eql(u8, op_name, "abs"))
if (comptime @typeInfo(T) == .int) @abs(a) else @as(T, @abs(a))
else if (comptime std.mem.eql(u8, op_name, "eq"))
a == b
else if (comptime std.mem.eql(u8, op_name, "gt"))
a > b
else
unreachable;
}
const n_end = getTime();
native_total_ns += @as(f64, @floatFromInt(n_start.durationTo(n_end).toNanoseconds()));
const v_start = getTime();
const va = getValT(T, 10);
const vb = getValT(T, 2);
for (0..ITERS) |_| {
// Native logic branch
_ = if (comptime std.mem.eql(u8, op_name, "add"))
if (comptime @typeInfo(T) == .int) va +| vb else va + vb
else if (comptime std.mem.eql(u8, op_name, "sub"))
if (comptime @typeInfo(T) == .int) va -| vb else va - vb
else if (comptime std.mem.eql(u8, op_name, "mul"))
if (comptime @typeInfo(T) == .int) va *| vb else va * vb
else if (comptime std.mem.eql(u8, op_name, "div"))
if (comptime @typeInfo(T) == .int) @divTrunc(va, vb) else va / vb
else if (comptime std.mem.eql(u8, op_name, "abs"))
if (comptime @typeInfo(T) == .int) @abs(va) else @as(T, @abs(va))
else if (comptime std.mem.eql(u8, op_name, "eq"))
va == vb
else if (comptime std.mem.eql(u8, op_name, "gt"))
va > vb
else
unreachable;
}
const v_end = getTime();
vector_total_ns += @as(f64, @floatFromInt(v_start.durationTo(v_end).toNanoseconds()));
// --- 2. Benchmark Scalar ---
const q_start = getTime();
const qa = M.splat(getValT(T, 10));
const qb = M.splat(getValT(T, 2));
for (0..ITERS) |_| {
// Scalar logic branch
_ = if (comptime std.mem.eql(u8, op_name, "add"))
qa.add(qb)
else if (comptime std.mem.eql(u8, op_name, "sub"))
qa.sub(qb)
else if (comptime std.mem.eql(u8, op_name, "mul"))
qa.mul(qb)
else if (comptime std.mem.eql(u8, op_name, "div"))
qa.div(qb)
else if (comptime std.mem.eql(u8, op_name, "abs"))
qa.abs()
else if (comptime std.mem.eql(u8, op_name, "eq"))
qa.eq(qb)
else if (comptime std.mem.eql(u8, op_name, "gt"))
qa.gt(qb)
else
unreachable;
}
const q_end = getTime();
tensor_total_ns += @as(f64, @floatFromInt(q_start.durationTo(q_end).toNanoseconds()));
}
});
const avg_n = (native_total_ns / SAMPLES) / @as(f64, @floatFromInt(ITERS));
const avg_v = (vector_total_ns / SAMPLES) / @as(f64, @floatFromInt(ITERS));
const avg_t = (tensor_total_ns / SAMPLES) / @as(f64, @floatFromInt(ITERS));
const slowdown_nt = avg_t / avg_n;
const slowdown_vt = avg_t / avg_v;
try writer.print("│ {s:<9} │ {s:<4} │ {d:>7.2}ns │ {d:>7.2}ns │ {d:>7.2}ns │ {d:>8.2}x {d:>8.2}x │\n", .{
op_name, TNames[tidx], avg_n, avg_v, avg_t, slowdown_nt, slowdown_vt,
});
}
if (j != Ops.len - 1) try writer.print("├───────────┼──────┼───────────┼───────────┼───────────┼───────────────────────┤\n", .{});
}
try writer.print("└───────────┴──────┴───────────┴───────────┴───────────┴───────────────────────┘\n", .{});
}
fn bench_crossTypeVsNative(writer: *std.Io.Writer) !void {
const ITERS: usize = 100_000;
const SAMPLES: usize = 5;
const getValT = struct {
fn f(comptime TT: type, i: usize) TT {
// Keep values safe and non-zero to avoid division by zero or overflows during cross-casting
const v = (i % 50) + 1;
return if (comptime @typeInfo(TT) == .float) @floatFromInt(v) else @intCast(v);
}
}.f;
// Helper for the Native baseline: explicitly casting T2 to T1 before the operation
const castTo = struct {
fn f(comptime DestT: type, comptime SrcT: type, val: SrcT) DestT {
if (comptime DestT == SrcT) return val;
const src_info = @typeInfo(SrcT);
const dest_info = @typeInfo(DestT);
if (dest_info == .int and src_info == .int) return @intCast(val);
if (dest_info == .float and src_info == .int) return @floatFromInt(val);
if (dest_info == .int and src_info == .float) return @intFromFloat(val);
if (dest_info == .float and src_info == .float) return @floatCast(val);
unreachable;
}
}.f;
const Types = .{ i16, i64, i128, f32, f64 };
const TNames = .{ "i16", "i64", "i128", "f32", "f64" };
const Ops = .{ "add", "mul", "div" };
try writer.print(
\\
\\ Cross-Type Overhead Analysis: Scalar vs Native
\\
\\┌─────────┬──────┬──────┬───────────┬───────────┬───────────┐
\\│ Op │ T1 │ T2 │ Native │ Scalar │ Slowdown │
\\├─────────┼──────┼──────┼───────────┼───────────┼───────────┤
\\
, .{});
inline for (Ops, 0..) |op_name, j| {
inline for (Types, 0..) |T1, t1_idx| {
inline for (Types, 0..) |T2, t2_idx| {
var native_total_ns: f64 = 0;
var quantity_total_ns: f64 = 0;
const M1 = Tensor(T1, .{ .L = 1 }, .{}, &.{1});
const M2 = Tensor(T2, .{ .L = 1 }, .{}, &.{1});
const S2 = Tensor(T2, .{ .T = 1 }, .{}, &.{1});
std.mem.doNotOptimizeAway({
for (0..SAMPLES) |_| {
// --- 1. Benchmark Native (Cast T2 to T1, then math) ---
const n_start = getTime();
for (0..ITERS) |i| {
const a = getValT(T1, i);
const b_raw = getValT(T2, 2);
const b = castTo(T1, T2, b_raw);
_ = if (comptime std.mem.eql(u8, op_name, "add"))
a + b
else if (comptime std.mem.eql(u8, op_name, "mul"))
a * b
else if (comptime @typeInfo(T1) == .int)
@divTrunc(a, b)
else
a / b;
}
const n_end = getTime();
native_total_ns += @as(f64, @floatFromInt(n_start.durationTo(n_end).toNanoseconds()));
// --- 2. Benchmark Scalar ---
const q_start = getTime();
for (0..ITERS) |i| {
const qa = M1.splat(getValT(T1, i));
const qb = if (comptime std.mem.eql(u8, op_name, "div"))
S2.splat(getValT(T2, 2))
else
M2.splat(getValT(T2, 2));
_ = if (comptime std.mem.eql(u8, op_name, "add"))
qa.add(qb)
else if (comptime std.mem.eql(u8, op_name, "mul"))
qa.mul(qb)
else
qa.div(qb);
}
const q_end = getTime();
quantity_total_ns += @as(f64, @floatFromInt(q_start.durationTo(q_end).toNanoseconds()));
}
const avg_n = (native_total_ns / SAMPLES) / @as(f64, @floatFromInt(ITERS));
const avg_q = (quantity_total_ns / SAMPLES) / @as(f64, @floatFromInt(ITERS));
const slowdown = avg_q / avg_n;
try writer.print("│ {s:<7} │ {s:<4} │ {s:<4} │ {d:>7.2}ns │ {d:>7.2}ns │ {d:>8.2}x │\n", .{
op_name, TNames[t1_idx], TNames[t2_idx], avg_n, avg_q, slowdown,
});
});
}
}
if (j != Ops.len - 1) {
try writer.print("├─────────┼──────┼──────┼───────────┼───────────┼───────────┤\n", .{});
}
}
try writer.print("└─────────┴──────┴──────┴───────────┴───────────┴───────────┘\n", .{});
}
fn bench_Vector(writer: *std.Io.Writer) !void {
const ITERS: usize = 10_000;
const SAMPLES: usize = 10;
const getVal = struct {
fn f(comptime TT: type, i: usize, comptime mask: u7) TT {
const v: u8 = @as(u8, @truncate(i & @as(usize, mask))) + 1;
return if (comptime @typeInfo(TT) == .float) @floatFromInt(v) else @intCast(v);
}
}.f;
const computeStats = struct {
fn f(samples: []f64, iters: usize) f64 {
std.mem.sort(f64, samples, {}, std.sort.asc(f64));
const mid = samples.len / 2;
const median_ns = if (samples.len % 2 == 0)
(samples[mid - 1] + samples[mid]) / 2.0
else
samples[mid];
return median_ns / @as(f64, @floatFromInt(iters));
}
}.f;
try writer.print(
\\
\\ Vector<N, T> benchmark — {d} iterations, {d} samples/cell
\\ (Results in ns/op; "---" = not applicable for this length)
\\
\\┌──────────────────┬──────┬─────────┬─────────┬─────────┬─────────┬─────────┐
\\│ Operation │ Type │ Len=1 │ Len=3 │ Len=4 │ Len=16 │ Len=100 │
\\├──────────────────┼──────┼─────────┼─────────┼─────────┼─────────┼─────────┤
\\
, .{ ITERS, SAMPLES });
const Types = .{ i32, i64, i128, f32, f64 };
const TNames = .{ "i32", "i64", "i128", "f32", "f64" };
const Lengths = .{ 1, 3, 4, 16, 100 };
// "cross" is only valid for len=3; other cells will show " --- "
const Ops = .{ "add", "div", "mulScalar", "dot", "cross", "product", "pow", "length" };
inline for (Ops, 0..) |op_name, o_idx| {
inline for (Types, TNames) |T, tname| {
try writer.print("│ {s:<16} │ {s:<4} │", .{ op_name, tname });
inline for (Lengths) |len| {
const Q_time = Tensor(T, .{ .T = 1 }, .{}, &.{1});
const V = Tensor(T, .{ .L = 1 }, .{}, &.{len});
// cross product is only defined for len == 3
const is_cross = comptime std.mem.eql(u8, op_name, "cross");
if (comptime is_cross and len != 3) {
try writer.print(" --- │", .{});
continue;
}
var samples: [SAMPLES]f64 = undefined;
std.mem.doNotOptimizeAway({
for (0..SAMPLES) |s_idx| {
const t_start = getTime();
for (0..ITERS) |i| {
const v1 = V.splat(getVal(T, i, 63));
if (comptime std.mem.eql(u8, op_name, "add")) {
const v2 = V.splat(getVal(T, i +% 7, 63));
_ = v1.add(v2);
} else if (comptime std.mem.eql(u8, op_name, "div")) {
_ = v1.div(V.splat(getVal(T, i +% 2, 63)));
} else if (comptime std.mem.eql(u8, op_name, "mulScalar")) {
const s_val = Q_time.splat(getVal(T, i +% 2, 63));
_ = v1.mul(s_val);
} else if (comptime std.mem.eql(u8, op_name, "dot")) {
const v2 = V.splat(getVal(T, i +% 5, 63));
_ = v1.contract(v2, 0, 0);
} else if (comptime std.mem.eql(u8, op_name, "cross")) {
// len == 3 guaranteed by the guard above
const v2 = V.splat(getVal(T, i +% 5, 63));
_ = v1.cross(v2);
} else if (comptime std.mem.eql(u8, op_name, "product")) {
_ = v1.product();
} else if (comptime std.mem.eql(u8, op_name, "pow")) {
_ = v1.pow(2);
} else if (comptime std.mem.eql(u8, op_name, "length")) {
_ = v1.length();
}
}
const t_end = getTime();
samples[s_idx] = @as(f64, @floatFromInt(t_start.durationTo(t_end).toNanoseconds()));
}
const median_ns_per_op = computeStats(&samples, ITERS);
try writer.print(" {d:>7.1} │", .{median_ns_per_op});
});
}
try writer.print("\n", .{});
}
if (o_idx < Ops.len - 1) {
try writer.print("├──────────────────┼──────┼─────────┼─────────┼─────────┼─────────┼─────────┤\n", .{});
}
}
try writer.print("└──────────────────┴──────┴─────────┴─────────┴─────────┴─────────┴─────────┘\n", .{});
}
fn bench_HighDimTensor(writer: *std.Io.Writer) !void {
const ITERS: usize = 5_000;
const SAMPLES: usize = 5;
const getVal = struct {
fn f(comptime TT: type, i: usize, comptime mask: u7) TT {
const v: u8 = @as(u8, @truncate(i & @as(usize, mask))) + 1;
return if (comptime @typeInfo(TT) == .float) @floatFromInt(v) else @intCast(v);
}
}.f;
const computeStats = struct {
fn f(samples: []f64, iters: usize) f64 {
std.mem.sort(f64, samples, {}, std.sort.asc(f64));
const mid = samples.len / 2;
const median_ns = if (samples.len % 2 == 0)
(samples[mid - 1] + samples[mid]) / 2.0
else
samples[mid];
return median_ns / @as(f64, @floatFromInt(iters));
}
}.f;
try writer.print(
\\
\\ High Dimension Tensor benchmark — {d} iterations, {d} samples/cell
\\ (Results in ns/op)
\\
\\┌─────────────────┬──────┬──────────────┬──────────────┬──────────────┬──────────────┐
\\│ Operation │ Type │ 2x2x2 │ 3x3x3 │ 4x4x4 │ 10x10x10x10 │
\\├─────────────────┼──────┼──────────────┼──────────────┼──────────────┼──────────────┤
\\
, .{ ITERS, SAMPLES });
const Types = .{ i32, i64, f32, f64 };
const TNames = .{ "i32", "i64", "f32", "f64" };
// Testing multiple structural bounds
const Shapes = .{
&.{ 2, 2, 2 },
&.{ 3, 3, 3 },
&.{ 4, 4, 4 },
&.{ 10, 10, 10, 10 },
};
const Ops = .{ "add", "sub", "mulElem", "mulScalar", "abs" };
inline for (Ops, 0..) |op_name, o_idx| {
inline for (Types, TNames) |T, tname| {
try writer.print("│ {s:<15} │ {s:<4} │", .{ op_name, tname });
inline for (Shapes) |shape| {
const V = Tensor(T, .{ .L = 1 }, .{}, shape);
const Q = Tensor(T, .{ .T = 1 }, .{}, &.{1}); // For scalar broadcasting operations
var samples: [SAMPLES]f64 = undefined;
for (0..SAMPLES) |s_idx| {
const t_start = getTime();
for (0..ITERS) |i| {
std.mem.doNotOptimizeAway({
const t1 = V.splat(getVal(T, i, 63));
_ = if (comptime std.mem.eql(u8, op_name, "add"))
t1.add(V.splat(getVal(T, i +% 7, 63)))
else if (comptime std.mem.eql(u8, op_name, "sub"))
t1.sub(V.splat(getVal(T, i +% 3, 63)))
else if (comptime std.mem.eql(u8, op_name, "mulElem"))
t1.mul(V.splat(getVal(T, i +% 5, 63)))
else if (comptime std.mem.eql(u8, op_name, "mulScalar"))
t1.mul(Q.splat(getVal(T, i +% 2, 63)))
else if (comptime std.mem.eql(u8, op_name, "abs"))
t1.abs()
else
unreachable;
});
}
const t_end = getTime();
samples[s_idx] = @as(f64, @floatFromInt(t_start.durationTo(t_end).toNanoseconds()));
}
const median_ns_per_op = computeStats(&samples, ITERS);
try writer.print(" {d:>12.1} │", .{median_ns_per_op});
}
try writer.print("\n", .{});
}
if (o_idx < Ops.len - 1) {
try writer.print("├─────────────────┼──────┼──────────────┼──────────────┼──────────────┼──────────────┤\n", .{});
}
}
try writer.print("└─────────────────┴──────┴──────────────┴──────────────┴──────────────┴──────────────┘\n", .{});
}
fn vectorSIMDvsNative(comptime T: type, writer: *std.Io.Writer) !void {
const iterations: u64 = 10_000;
const lens = [_]u32{ 1, 2, 3, 4, 5, 10, 100, 1_000, 10_000 };
try writer.print("\nSIMD Speedup Analysis: {s}\n", .{@typeName(T)});
try writer.print("┌────────────┬────────────┬────────────┬────────────┐\n", .{});
try writer.print("│ Vector Len │ Scalar (us)│ Vector (us)│ Speedup │\n", .{});
try writer.print("├────────────┼────────────┼────────────┼────────────┤\n", .{});
inline for (lens) |vector_len| {
// --- Scalar Test ---
var scalar_val: T = 10;
const start_scalar = getTime();
var i: u64 = 0;
while (i < iterations * vector_len) : (i += 1) {
if (comptime @typeInfo(T) == .int)
scalar_val = scalar_val +% 1
else
scalar_val = scalar_val + 1;
}
const scalar_time = start_scalar.durationTo(getTime()).toMicroseconds();
// --- Vector Test ---
var vector_val: @Vector(vector_len, T) = @splat(20);
const start_vector = getTime();
i = 0;
const increment: @Vector(vector_len, T) = @splat(1);
while (i < iterations) : (i += 1) {
if (comptime @typeInfo(T) == .int)
vector_val = vector_val +% increment
else
vector_val = vector_val + increment;
}
const vector_time = start_vector.durationTo(getTime()).toMicroseconds();
// --- Results ---
const s_float = @as(f64, @floatFromInt(scalar_time));
const v_float = @as(f64, @floatFromInt(vector_time));
// Speedup = ScalarTime / VectorTime.
// > 1.0 means SIMD is faster.
const speedup = if (vector_time > 0) s_float / v_float else 0;
try writer.print("│ {d:<10} │ {d:>10} │ {d:>10} │ {d:>9.2}x │\n", .{
vector_len,
scalar_time,
vector_time,
speedup,
});
try writer.flush();
std.mem.doNotOptimizeAway(scalar_val);
std.mem.doNotOptimizeAway(vector_val);
}
try writer.print("└────────────┴────────────┴────────────┴────────────┘\n", .{});
}