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style(fmt): run 'zig fmt .'
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2 files changed

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src/bench_uuid_contention.zig

Lines changed: 19 additions & 19 deletions
Original file line numberDiff line numberDiff line change
@@ -1,5 +1,5 @@
11
//! Benchmark to measure global mutex contention in UUID generation
2-
//!
2+
//!
33
//! This benchmark demonstrates the performance impact of the global mutex
44
//! in uuid.zig by comparing single-threaded vs multi-threaded generation.
55

@@ -11,17 +11,17 @@ const num_threads = 8;
1111

1212
fn singleThreadedBenchmark() !void {
1313
var gen = uuid.initSecure();
14-
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1515
const start = std.time.nanoTimestamp();
16-
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for (0..num_iterations) |_| {
1818
_ = try gen.next();
1919
}
20-
20+
2121
const end = std.time.nanoTimestamp();
2222
const elapsed_ms = @divFloor(end - start, std.time.ns_per_ms);
2323
const ops_per_sec = (num_iterations * std.time.ns_per_s) / @as(u64, @intCast(end - start));
24-
24+
2525
std.debug.print("Single-threaded: {} UUIDs in {}ms ({} ops/sec)\n", .{
2626
num_iterations,
2727
elapsed_ms,
@@ -37,27 +37,27 @@ const ThreadContext = struct {
3737

3838
fn workerThread(ctx: *ThreadContext) !void {
3939
var gen = uuid.initSecure();
40-
40+
4141
const start = std.time.nanoTimestamp();
42-
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4343
for (0..ctx.count) |_| {
4444
_ = try gen.next();
4545
}
46-
46+
4747
const end = std.time.nanoTimestamp();
4848
ctx.duration_ns = end - start;
4949
}
5050

5151
fn multiThreadedBenchmark() !void {
5252
const allocator = std.heap.page_allocator;
53-
53+
5454
var threads: [num_threads]std.Thread = undefined;
5555
var contexts: [num_threads]ThreadContext = undefined;
56-
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5757
const per_thread = num_iterations / num_threads;
58-
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5959
const total_start = std.time.nanoTimestamp();
60-
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6161
// Spawn threads
6262
for (0..num_threads) |i| {
6363
contexts[i] = .{
@@ -67,24 +67,24 @@ fn multiThreadedBenchmark() !void {
6767
};
6868
threads[i] = try std.Thread.spawn(.{}, workerThread, .{&contexts[i]});
6969
}
70-
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7171
// Wait for all threads
7272
for (0..num_threads) |i| {
7373
threads[i].join();
7474
}
75-
75+
7676
const total_end = std.time.nanoTimestamp();
7777
const total_elapsed = total_end - total_start;
7878
const total_elapsed_ms = @divFloor(total_elapsed, std.time.ns_per_ms);
7979
const total_ops_per_sec = (num_iterations * std.time.ns_per_s) / @as(u64, @intCast(total_elapsed));
80-
80+
8181
std.debug.print("\nMulti-threaded ({} threads): {} UUIDs in {}ms ({} ops/sec)\n", .{
8282
num_threads,
8383
num_iterations,
8484
total_elapsed_ms,
8585
total_ops_per_sec,
8686
});
87-
87+
8888
// Show per-thread stats
8989
std.debug.print("Per-thread breakdown:\n", .{});
9090
for (contexts, 0..) |ctx, i| {
@@ -96,17 +96,17 @@ fn multiThreadedBenchmark() !void {
9696
thread_ops_per_sec,
9797
});
9898
}
99-
99+
100100
_ = allocator;
101101
}
102102

103103
pub fn main() !void {
104104
std.debug.print("=== UUID Generation Mutex Contention Benchmark ===\n\n", .{});
105105
std.debug.print("Generating {} UUIDs...\n\n", .{num_iterations});
106-
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107107
try singleThreadedBenchmark();
108108
try multiThreadedBenchmark();
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109+
110110
std.debug.print("\n=== Analysis ===\n", .{});
111111
std.debug.print("If multi-threaded performance is significantly worse than\n", .{});
112112
std.debug.print("single-threaded * num_threads, the global mutex is causing contention.\n", .{});

src/uuid/uuid.zig

Lines changed: 0 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -281,4 +281,3 @@ test "collision safety - multi-threaded generation" {
281281
}
282282
}
283283
}
284-

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