perf: various optimizations (#2175)

caddy/admin_test.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"io"
 	"net/http"
+	"strings"
 	"sync"
 	"testing"
 
@@ -249,7 +250,7 @@ func TestAddModuleWorkerViaAdminApi(t *testing.T) {
 	initialDebugState := getDebugState(t, tester)
 	initialWorkerCount := 0
 	for _, thread := range initialDebugState.ThreadDebugStates {
-		if thread.Name != "" && thread.Name != "ready" {
+		if strings.HasPrefix(thread.Name, "Worker PHP Thread") {
 			initialWorkerCount++
 		}
 	}
@@ -286,7 +287,7 @@ func TestAddModuleWorkerViaAdminApi(t *testing.T) {
 	workerFound := false
 	filename, _ := fastabs.FastAbs("../testdata/worker-with-counter.php")
 	for _, thread := range updatedDebugState.ThreadDebugStates {
-		if thread.Name != "" && thread.Name != "ready" {
+		if strings.HasPrefix(thread.Name, "Worker PHP Thread") {
 			updatedWorkerCount++
 			if thread.Name == "Worker PHP Thread - "+filename {
 				workerFound = true

caddy/module.go

@@ -130,6 +130,11 @@ func (f *FrankenPHPModule) Provision(ctx caddy.Context) error {
 		f.ResolveRootSymlink = &rrs
 	}
 
+	// Always pre-compute absolute file names for fallback matching
+	for i := range f.Workers {
+		f.Workers[i].absFileName, _ = fastabs.FastAbs(f.Workers[i].FileName)
+	}
+
 	if !needReplacement(f.Root) {
 		root, err := fastabs.FastAbs(f.Root)
 		if err != nil {
@@ -145,13 +150,21 @@ func (f *FrankenPHPModule) Provision(ctx caddy.Context) error {
 
 			f.resolvedDocumentRoot = root
 
-			// Also resolve symlinks in worker file paths when resolve_root_symlink is true
+			// Resolve symlinks in worker file paths
 			for i, wc := range f.Workers {
-				if !filepath.IsAbs(wc.FileName) {
+				if filepath.IsAbs(wc.FileName) {
-					continue
+					resolvedPath, _ := filepath.EvalSymlinks(wc.FileName)
+					f.Workers[i].FileName = resolvedPath
+					f.Workers[i].absFileName = resolvedPath
 				}
-				resolvedPath, _ := filepath.EvalSymlinks(wc.FileName)
+			}
-				f.Workers[i].FileName = resolvedPath
+		}
+
+		// Pre-compute relative match paths for all workers (requires resolved document root)
+		docRootWithSep := f.resolvedDocumentRoot + string(filepath.Separator)
+		for i := range f.Workers {
+			if strings.HasPrefix(f.Workers[i].absFileName, docRootWithSep) {
+				f.Workers[i].matchRelPath = filepath.ToSlash(f.Workers[i].absFileName[len(f.resolvedDocumentRoot):])
 			}
 		}
 

caddy/workerconfig.go

@@ -2,6 +2,7 @@ package caddy
 
 import (
 	"net/http"
+	"path"
 	"path/filepath"
 	"strconv"
 
@@ -43,6 +44,8 @@ type workerConfig struct {
 
 	options        []frankenphp.WorkerOption
 	requestOptions []frankenphp.RequestOption
+	absFileName    string
+	matchRelPath   string // pre-computed relative URL path for fast matching
 }
 
 func unmarshalWorker(d *caddyfile.Dispenser) (workerConfig, error) {
@@ -171,15 +174,28 @@ func (wc *workerConfig) inheritEnv(env map[string]string) {
 }
 
 func (wc *workerConfig) matchesPath(r *http.Request, documentRoot string) bool {
-
 	// try to match against a pattern if one is assigned
 	if len(wc.MatchPath) != 0 {
 		return (caddyhttp.MatchPath)(wc.MatchPath).Match(r)
 	}
 
-	// if there is no pattern, try to match against the actual path (in the public directory)
+	// fast path: compare the request URL path against the pre-computed relative path
-	fullScriptPath, _ := fastabs.FastAbs(documentRoot + "/" + r.URL.Path)
+	if wc.matchRelPath != "" {
-	absFileName, _ := fastabs.FastAbs(wc.FileName)
+		reqPath := r.URL.Path
+		if reqPath == wc.matchRelPath {
+			return true
+		}
 
-	return fullScriptPath == absFileName
+		// ensure leading slash for relative paths (see #2166)
+		if reqPath == "" || reqPath[0] != '/' {
+			reqPath = "/" + reqPath
+		}
+
+		return path.Clean(reqPath) == wc.matchRelPath
+	}
+
+	// fallback when documentRoot is dynamic (contains placeholders)
+	fullPath, _ := fastabs.FastAbs(filepath.Join(documentRoot, r.URL.Path))
+
+	return fullPath == wc.absFileName
 }

cgi.go

@@ -67,6 +67,20 @@ var knownServerKeys = []string{
 	"REQUEST_URI",
 }
 
+// cStringHTTPMethods caches C string versions of common HTTP methods
+// to avoid allocations in pinCString on every request.
+var cStringHTTPMethods = map[string]*C.char{
+	"GET":     C.CString("GET"),
+	"HEAD":    C.CString("HEAD"),
+	"POST":    C.CString("POST"),
+	"PUT":     C.CString("PUT"),
+	"DELETE":  C.CString("DELETE"),
+	"CONNECT": C.CString("CONNECT"),
+	"OPTIONS": C.CString("OPTIONS"),
+	"TRACE":   C.CString("TRACE"),
+	"PATCH":   C.CString("PATCH"),
+}
+
 // computeKnownVariables returns a set of CGI environment variables for the request.
 //
 // TODO: handle this case https://github.com/caddyserver/caddy/issues/3718
@@ -84,8 +98,9 @@ func addKnownVariablesToServer(fc *frankenPHPContext, trackVarsArray *C.zval) {
 	}
 
 	// Remove [] from IPv6 addresses
-	ip = strings.Replace(ip, "[", "", 1)
+	if len(ip) > 0 && ip[0] == '[' {
-	ip = strings.Replace(ip, "]", "", 1)
+		ip = ip[1 : len(ip)-1]
+	}
 
 	var https, sslProtocol, sslCipher, rs string
 
@@ -98,7 +113,7 @@ func addKnownVariablesToServer(fc *frankenPHPContext, trackVarsArray *C.zval) {
 		rs = "https"
 		https = "on"
 
-		// and pass the protocol details in a manner compatible with apache's mod_ssl
+		// and pass the protocol details in a manner compatible with Apache's mod_ssl
 		// (which is why these have an SSL_ prefix and not TLS_).
 		if v, ok := tlsProtocolStrings[request.TLS.Version]; ok {
 			sslProtocol = v
@@ -138,7 +153,7 @@ func addKnownVariablesToServer(fc *frankenPHPContext, trackVarsArray *C.zval) {
 	if fc.originalRequest != nil {
 		requestURI = fc.originalRequest.URL.RequestURI()
 	} else {
-		requestURI = request.URL.RequestURI()
+		requestURI = fc.requestURI
 	}
 
 	C.frankenphp_register_bulk(
@@ -252,7 +267,7 @@ func splitCgiPath(fc *frankenPHPContext) {
 	// TODO: is it possible to delay this and avoid saving everything in the context?
 	// SCRIPT_FILENAME is the absolute path of SCRIPT_NAME
 	fc.scriptFilename = sanitizedPathJoin(fc.documentRoot, fc.scriptName)
-	fc.worker = getWorkerByPath(fc.scriptFilename)
+	fc.worker = workersByPath[fc.scriptFilename]
 }
 
 var splitSearchNonASCII = search.New(language.Und, search.IgnoreCase)
@@ -329,7 +344,11 @@ func go_update_request_info(threadIndex C.uintptr_t, info *C.sapi_request_info)
 		return nil
 	}
 
-	info.request_method = thread.pinCString(request.Method)
+	if m, ok := cStringHTTPMethods[request.Method]; ok {
+		info.request_method = m
+	} else {
+		info.request_method = thread.pinCString(request.Method)
+	}
 	info.query_string = thread.pinCString(request.URL.RawQuery)
 	info.content_length = C.zend_long(request.ContentLength)
 
@@ -341,7 +360,7 @@ func go_update_request_info(threadIndex C.uintptr_t, info *C.sapi_request_info)
 		info.path_translated = thread.pinCString(sanitizedPathJoin(fc.documentRoot, fc.pathInfo)) // See: http://www.oreilly.com/openbook/cgi/ch02_04.html
 	}
 
-	info.request_uri = thread.pinCString(request.URL.RequestURI())
+	info.request_uri = thread.pinCString(fc.requestURI)
 
 	info.proto_num = C.int(request.ProtoMajor*1000 + request.ProtoMinor)
 

context.go

@@ -28,13 +28,15 @@ type frankenPHPContext struct {
 	pathInfo       string
 	scriptName     string
 	scriptFilename string
+	requestURI     string
 
 	// Whether the request is already closed by us
 	isDone bool
 
-	responseWriter    http.ResponseWriter
+	responseWriter     http.ResponseWriter
-	handlerParameters any
+	responseController *http.ResponseController
-	handlerReturn     any
+	handlerParameters  any
+	handlerReturn      any
 
 	done      chan any
 	startedAt time.Time
@@ -93,6 +95,8 @@ func NewRequestWithContext(r *http.Request, opts ...RequestOption) (*http.Reques
 		splitCgiPath(fc)
 	}
 
+	fc.requestURI = r.URL.RequestURI()
+
 	c := context.WithValue(r.Context(), contextKey, fc)
 
 	return r.WithContext(c), nil

frankenphp.go

@@ -611,7 +611,10 @@ func go_sapi_flush(threadIndex C.uintptr_t) bool {
 		return true
 	}
 
-	if err := http.NewResponseController(fc.responseWriter).Flush(); err != nil {
+	if fc.responseController == nil {
+		fc.responseController = http.NewResponseController(fc.responseWriter)
+	}
+	if err := fc.responseController.Flush(); err != nil {
 		ctx := thread.context()
 
 		if globalLogger.Enabled(ctx, slog.LevelWarn) {
@@ -683,34 +686,28 @@ func getLogger(threadIndex C.uintptr_t) (*slog.Logger, context.Context) {
 func go_log(threadIndex C.uintptr_t, message *C.char, level C.int) {
 	logger, ctx := getLogger(threadIndex)
 
-	m := C.GoString(message)
 	le := syslogLevelInfo
-
 	if level >= C.int(syslogLevelEmerg) && level <= C.int(syslogLevelDebug) {
 		le = syslogLevel(level)
 	}
 
+	var slogLevel slog.Level
 	switch le {
 	case syslogLevelEmerg, syslogLevelAlert, syslogLevelCrit, syslogLevelErr:
-		if logger.Enabled(ctx, slog.LevelError) {
+		slogLevel = slog.LevelError
-			logger.LogAttrs(ctx, slog.LevelError, m, slog.String("syslog_level", le.String()))
-		}
-
 	case syslogLevelWarn:
-		if logger.Enabled(ctx, slog.LevelWarn) {
+		slogLevel = slog.LevelWarn
-			logger.LogAttrs(ctx, slog.LevelWarn, m, slog.String("syslog_level", le.String()))
-		}
-
 	case syslogLevelDebug:
-		if logger.Enabled(ctx, slog.LevelDebug) {
+		slogLevel = slog.LevelDebug
-			logger.LogAttrs(ctx, slog.LevelDebug, m, slog.String("syslog_level", le.String()))
-		}
-
 	default:
-		if logger.Enabled(ctx, slog.LevelInfo) {
+		slogLevel = slog.LevelInfo
-			logger.LogAttrs(ctx, slog.LevelInfo, m, slog.String("syslog_level", le.String()))
-		}
 	}
+
+	if !logger.Enabled(ctx, slogLevel) {
+		return
+	}
+
+	logger.LogAttrs(ctx, slogLevel, C.GoString(message), slog.String("syslog_level", le.String()))
 }
 
 //export go_log_attrs
@@ -805,6 +802,8 @@ func resetGlobals() {
 	globalCtx = context.Background()
 	globalLogger = slog.Default()
 	workers = nil
+	workersByName = nil
+	workersByPath = nil
 	watcherIsEnabled = false
 	globalMu.Unlock()
 }

internal/fastabs/filepath_unix.go

@@ -19,7 +19,7 @@ func init() {
 	}
 
 	canonicalWD, err := filepath.EvalSymlinks(wd)
-	if err != nil {
+	if err == nil {
 		wd = canonicalWD
 	}
 }

internal/state/state.go

@@ -4,40 +4,71 @@ import "C"
 import (
 	"slices"
 	"sync"
+	"sync/atomic"
 	"time"
 )
 
-type State string
+type State int
 
 const (
 	// lifecycle States of a thread
-	Reserved      State = "reserved"
+	Reserved      State = iota
-	Booting       State = "booting"
+	Booting
-	BootRequested State = "boot requested"
+	BootRequested
-	ShuttingDown  State = "shutting down"
+	ShuttingDown
-	Done          State = "done"
+	Done
 
 	// these States are 'stable' and safe to transition from at any time
-	Inactive State = "inactive"
+	Inactive
-	Ready    State = "ready"
+	Ready
 
 	// States necessary for restarting workers
-	Restarting State = "restarting"
+	Restarting
-	Yielding   State = "yielding"
+	Yielding
 
 	// States necessary for transitioning between different handlers
-	TransitionRequested  State = "transition requested"
+	TransitionRequested
-	TransitionInProgress State = "transition in progress"
+	TransitionInProgress
-	TransitionComplete   State = "transition complete"
+	TransitionComplete
 )
 
+func (s State) String() string {
+	switch s {
+	case Reserved:
+		return "reserved"
+	case Booting:
+		return "booting"
+	case BootRequested:
+		return "boot requested"
+	case ShuttingDown:
+		return "shutting down"
+	case Done:
+		return "done"
+	case Inactive:
+		return "inactive"
+	case Ready:
+		return "ready"
+	case Restarting:
+		return "restarting"
+	case Yielding:
+		return "yielding"
+	case TransitionRequested:
+		return "transition requested"
+	case TransitionInProgress:
+		return "transition in progress"
+	case TransitionComplete:
+		return "transition complete"
+	default:
+		return "unknown"
+	}
+}
+
 type ThreadState struct {
 	currentState State
 	mu           sync.RWMutex
 	subscribers  []stateSubscriber
-	// how long threads have been waiting in stable states
+	// how long threads have been waiting in stable states (unix ms, 0 = not waiting)
-	waitingSince time.Time
+	waitingSince atomic.Int64
-	isWaiting    bool
 }
 
 type stateSubscriber struct {
@@ -74,7 +105,7 @@ func (ts *ThreadState) CompareAndSwap(compareTo State, swapTo State) bool {
 }
 
 func (ts *ThreadState) Name() string {
-	return string(ts.Get())
+	return ts.Get().String()
 }
 
 func (ts *ThreadState) Get() State {
@@ -97,20 +128,17 @@ func (ts *ThreadState) notifySubscribers(nextState State) {
 		return
 	}
 
-	var newSubscribers []stateSubscriber
+	n := 0
-
-	// notify subscribers to the state change
 	for _, sub := range ts.subscribers {
 		if !slices.Contains(sub.states, nextState) {
-			newSubscribers = append(newSubscribers, sub)
+			ts.subscribers[n] = sub
-
+			n++
 			continue
 		}
-
 		close(sub.ch)
 	}
 
-	ts.subscribers = newSubscribers
+	ts.subscribers = ts.subscribers[:n]
 }
 
 // block until the thread reaches a certain state
@@ -156,39 +184,27 @@ func (ts *ThreadState) RequestSafeStateChange(nextState State) bool {
 
 // MarkAsWaiting hints that the thread reached a stable state and is waiting for requests or shutdown
 func (ts *ThreadState) MarkAsWaiting(isWaiting bool) {
-	ts.mu.Lock()
 	if isWaiting {
-		ts.isWaiting = true
+		ts.waitingSince.Store(time.Now().UnixMilli())
-		ts.waitingSince = time.Now()
 	} else {
-		ts.isWaiting = false
+		ts.waitingSince.Store(0)
 	}
-	ts.mu.Unlock()
 }
 
 // IsInWaitingState returns true if a thread is waiting for a request or shutdown
 func (ts *ThreadState) IsInWaitingState() bool {
-	ts.mu.RLock()
+	return ts.waitingSince.Load() != 0
-	isWaiting := ts.isWaiting
-	ts.mu.RUnlock()
-
-	return isWaiting
 }
 
 // WaitTime returns the time since the thread is waiting in a stable state in ms
 func (ts *ThreadState) WaitTime() int64 {
-	ts.mu.RLock()
+	since := ts.waitingSince.Load()
-	waitTime := int64(0)
+	if since == 0 {
-	if ts.isWaiting {
+		return 0
-		waitTime = time.Now().UnixMilli() - ts.waitingSince.UnixMilli()
 	}
-	ts.mu.RUnlock()
+	return time.Now().UnixMilli() - since
-
-	return waitTime
 }
 
 func (ts *ThreadState) SetWaitTime(t time.Time) {
-	ts.mu.Lock()
+	ts.waitingSince.Store(t.UnixMilli())
-	ts.waitingSince = t
-	ts.mu.Unlock()
 }

phpmainthread.go

@@ -198,6 +198,9 @@ func go_get_custom_php_ini(disableTimeouts C.bool) *C.char {
 	// Pass the php.ini overrides to PHP before startup
 	// TODO: if needed this would also be possible on a per-thread basis
 	var overrides strings.Builder
+
+	// 32 is an over-estimate for php.ini settings
+	overrides.Grow(len(mainThread.phpIni) * 32)
 	for k, v := range mainThread.phpIni {
 		overrides.WriteString(k)
 		overrides.WriteByte('=')

phpmainthread_test.go

@@ -185,8 +185,12 @@ func TestFinishBootingAWorkerScript(t *testing.T) {
 
 func TestReturnAnErrorIf2WorkersHaveTheSameFileName(t *testing.T) {
 	workers = []*worker{}
+	workersByName = map[string]*worker{}
+	workersByPath = map[string]*worker{}
 	w, err1 := newWorker(workerOpt{fileName: testDataPath + "/index.php"})
 	workers = append(workers, w)
+	workersByName[w.name] = w
+	workersByPath[w.fileName] = w
 	_, err2 := newWorker(workerOpt{fileName: testDataPath + "/index.php"})
 
 	assert.NoError(t, err1)
@@ -195,8 +199,12 @@ func TestReturnAnErrorIf2WorkersHaveTheSameFileName(t *testing.T) {
 
 func TestReturnAnErrorIf2ModuleWorkersHaveTheSameName(t *testing.T) {
 	workers = []*worker{}
+	workersByName = map[string]*worker{}
+	workersByPath = map[string]*worker{}
 	w, err1 := newWorker(workerOpt{fileName: testDataPath + "/index.php", name: "workername"})
 	workers = append(workers, w)
+	workersByName[w.name] = w
+	workersByPath[w.fileName] = w
 	_, err2 := newWorker(workerOpt{fileName: testDataPath + "/hello.php", name: "workername"})
 
 	assert.NoError(t, err1)
@@ -242,9 +250,9 @@ func allPossibleTransitions(worker1Path string, worker2Path string) []func(*phpT
 				thread.boot()
 			}
 		},
-		func(thread *phpThread) { convertToWorkerThread(thread, getWorkerByPath(worker1Path)) },
+		func(thread *phpThread) { convertToWorkerThread(thread, workersByPath[worker1Path]) },
 		convertToInactiveThread,
-		func(thread *phpThread) { convertToWorkerThread(thread, getWorkerByPath(worker2Path)) },
+		func(thread *phpThread) { convertToWorkerThread(thread, workersByPath[worker2Path]) },
 		convertToInactiveThread,
 	}
 }

phpthread.go

@@ -19,7 +19,7 @@ type phpThread struct {
 	threadIndex  int
 	requestChan  chan contextHolder
 	drainChan    chan struct{}
-	handlerMu    sync.Mutex
+	handlerMu    sync.RWMutex
 	handler      threadHandler
 	state        *state.ThreadState
 	sandboxedEnv map[string]*C.zend_string
@@ -120,9 +120,9 @@ func (thread *phpThread) context() context.Context {
 }
 
 func (thread *phpThread) name() string {
-	thread.handlerMu.Lock()
+	thread.handlerMu.RLock()
 	name := thread.handler.name()
-	thread.handlerMu.Unlock()
+	thread.handlerMu.RUnlock()
 	return name
 }
 

requestoptions.go

@@ -158,7 +158,7 @@ func WithRequestLogger(logger *slog.Logger) RequestOption {
 func WithWorkerName(name string) RequestOption {
 	return func(o *frankenPHPContext) error {
 		if name != "" {
-			o.worker = getWorkerByName(name)
+			o.worker = workersByName[name]
 		}
 
 		return nil

scaling.go

@@ -84,6 +84,11 @@ func addWorkerThread(worker *worker) (*phpThread, error) {
 
 // scaleWorkerThread adds a worker PHP thread automatically
 func scaleWorkerThread(worker *worker) {
+	// probe CPU usage before acquiring the lock (avoids holding lock during 120ms sleep)
+	if !cpu.ProbeCPUs(cpuProbeTime, maxCpuUsageForScaling, mainThread.done) {
+		return
+	}
+
 	scalingMu.Lock()
 	defer scalingMu.Unlock()
 
@@ -91,11 +96,6 @@ func scaleWorkerThread(worker *worker) {
 		return
 	}
 
-	// probe CPU usage before scaling
-	if !cpu.ProbeCPUs(cpuProbeTime, maxCpuUsageForScaling, mainThread.done) {
-		return
-	}
-
 	thread, err := addWorkerThread(worker)
 	if err != nil {
 		if globalLogger.Enabled(globalCtx, slog.LevelWarn) {
@@ -114,6 +114,11 @@ func scaleWorkerThread(worker *worker) {
 
 // scaleRegularThread adds a regular PHP thread automatically
 func scaleRegularThread() {
+	// probe CPU usage before acquiring the lock (avoids holding lock during 120ms sleep)
+	if !cpu.ProbeCPUs(cpuProbeTime, maxCpuUsageForScaling, mainThread.done) {
+		return
+	}
+
 	scalingMu.Lock()
 	defer scalingMu.Unlock()
 
@@ -121,11 +126,6 @@ func scaleRegularThread() {
 		return
 	}
 
-	// probe CPU usage before scaling
-	if !cpu.ProbeCPUs(cpuProbeTime, maxCpuUsageForScaling, mainThread.done) {
-		return
-	}
-
 	thread, err := addRegularThread()
 	if err != nil {
 		if globalLogger.Enabled(globalCtx, slog.LevelWarn) {

scaling_test.go

@@ -47,7 +47,7 @@ func TestScaleAWorkerThreadUpAndDown(t *testing.T) {
 	autoScaledThread := phpThreads[2]
 
 	// scale up
-	scaleWorkerThread(getWorkerByPath(workerPath))
+	scaleWorkerThread(workersByPath[workerPath])
 	assert.Equal(t, state.Ready, autoScaledThread.state.Get())
 
 	// on down-scale, the thread will be marked as inactive

worker.go

@@ -37,6 +37,8 @@ type worker struct {
 
 var (
 	workers          []*worker
+	workersByName    map[string]*worker
+	workersByPath    map[string]*worker
 	watcherIsEnabled bool
 	startupFailChan  chan error
 )
@@ -52,6 +54,8 @@ func initWorkers(opt []workerOpt) error {
 	)
 
 	workers = make([]*worker, 0, len(opt))
+	workersByName = make(map[string]*worker, len(opt))
+	workersByPath = make(map[string]*worker, len(opt))
 
 	for _, o := range opt {
 		w, err := newWorker(o)
@@ -61,6 +65,10 @@ func initWorkers(opt []workerOpt) error {
 
 		totalThreadsToStart += w.num
 		workers = append(workers, w)
+		workersByName[w.name] = w
+		if w.allowPathMatching {
+			workersByPath[w.fileName] = w
+		}
 	}
 
 	startupFailChan = make(chan error, totalThreadsToStart)
@@ -90,25 +98,6 @@ func initWorkers(opt []workerOpt) error {
 	return nil
 }
 
-func getWorkerByName(name string) *worker {
-	for _, w := range workers {
-		if w.name == name {
-			return w
-		}
-	}
-
-	return nil
-}
-
-func getWorkerByPath(path string) *worker {
-	for _, w := range workers {
-		if w.fileName == path && w.allowPathMatching {
-			return w
-		}
-	}
-
-	return nil
-}
 
 func newWorker(o workerOpt) (*worker, error) {
 	// Order is important!
@@ -118,6 +107,7 @@ func newWorker(o workerOpt) (*worker, error) {
 	if err != nil {
 		return nil, fmt.Errorf("worker filename is invalid %q: %w", o.fileName, err)
 	}
+
 	absFileName, err = fastabs.FastAbs(absFileName)
 	if err != nil {
 		return nil, fmt.Errorf("worker filename is invalid %q: %w", o.fileName, err)
@@ -135,10 +125,10 @@ func newWorker(o workerOpt) (*worker, error) {
 	// they can only be matched by their name, not by their path
 	allowPathMatching := !strings.HasPrefix(o.name, "m#")
 
-	if w := getWorkerByPath(absFileName); w != nil && allowPathMatching {
+	if w := workersByPath[absFileName]; w != nil && allowPathMatching {
 		return w, fmt.Errorf("two workers cannot have the same filename: %q", absFileName)
 	}
-	if w := getWorkerByName(o.name); w != nil {
+	if w := workersByName[o.name]; w != nil {
 		return w, fmt.Errorf("two workers cannot have the same name: %q", o.name)
 	}