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fix fuzzing speed with prior runs

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This commit is contained in:
Kendall Condon 2025-11-03 18:37:47 -05:00
parent 1444e5c5a2
commit 0dbbb93dbe
3 changed files with 8 additions and 1 deletions
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4
lib/build-web/fuzz.zig
View file

@ -1,5 +1,6 @@
// Server timestamp.
var start_fuzzing_timestamp: i64 = undefined;
var start_fuzzing_n_runs: u64 = undefined;
const js = struct {
extern "fuzz" fn requestSources() void;
@ -36,6 +37,7 @@ pub fn sourceIndexMessage(msg_bytes: []u8) error{OutOfMemory}!void {
const source_locations: []const Coverage.SourceLocation = @alignCast(std.mem.bytesAsSlice(Coverage.SourceLocation, msg_bytes[source_locations_start..source_locations_end]));
start_fuzzing_timestamp = header.start_timestamp;
start_fuzzing_n_runs = header.start_n_runs;
try updateCoverageSources(directories, files, source_locations, string_bytes);
js.ready();
}
@ -271,7 +273,7 @@ fn updateStats() error{OutOfMemory}!void {
const avg_speed: f64 = speed: {
const ns_elapsed: f64 = @floatFromInt(nsSince(start_fuzzing_timestamp));
const n_runs: f64 = @floatFromInt(hdr.n_runs);
const n_runs: f64 = @floatFromInt(hdr.n_runs -% start_fuzzing_n_runs);
break :speed n_runs / (ns_elapsed / std.time.ns_per_s);
};

4
lib/std/Build/Fuzz.zig
View file

@ -67,6 +67,7 @@ const CoverageMap = struct {
/// Elements are indexes into `source_locations` pointing to the unit tests that are being fuzz tested.
entry_points: std.ArrayList(u32),
start_timestamp: i64,
start_n_runs: u64,
fn deinit(cm: *CoverageMap, gpa: Allocator) void {
std.posix.munmap(cm.mapped_memory);
@ -318,6 +319,7 @@ pub fn sendUpdate(
.source_locations_len = @intCast(coverage_map.source_locations.len),
.string_bytes_len = @intCast(coverage_map.coverage.string_bytes.items.len),
.start_timestamp = coverage_map.start_timestamp,
.start_n_runs = coverage_map.start_n_runs,
};
var iovecs: [5][]const u8 = .{
@ptrCast(&header),
@ -399,6 +401,7 @@ fn prepareTables(fuzz: *Fuzz, run_step: *Step.Run, coverage_id: u64) error{ OutO
.source_locations = undefined, // populated below
.entry_points = .{},
.start_timestamp = ws.now(),
.start_n_runs = undefined, // populated below
};
errdefer gop.value_ptr.coverage.deinit(fuzz.gpa);
@ -475,6 +478,7 @@ fn prepareTables(fuzz: *Fuzz, run_step: *Step.Run, coverage_id: u64) error{ OutO
for (sorted_pcs.items(.index), sorted_pcs.items(.sl)) |i, sl| source_locations[i] = sl;
gop.value_ptr.source_locations = source_locations;
gop.value_ptr.start_n_runs = header.n_runs;
ws.notifyUpdate();
}

1
lib/std/Build/abi.zig
View file

@ -219,6 +219,7 @@ pub const fuzz = struct {
string_bytes_len: u32,
/// When, according to the server, fuzzing started.
start_timestamp: i64 align(4),
start_n_runs: u64 align(4),
};
/// WebSocket server->client.