tvalentyn commented on code in PR #38853: URL: https://github.com/apache/beam/pull/38853#discussion_r3384745844
########## sdks/python/container/profiler.go: ########## @@ -0,0 +1,314 @@ +// Licensed to the Apache Software Foundation (ASF) under one or more +// contributor license agreements. See the NOTICE file distributed with +// this work for additional information regarding copyright ownership. +// The ASF licenses this file to You under the Apache License, Version 2.0 +// (the "License"); you may not use this file except in compliance with +// the License. You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +package main + +import ( + "context" + "fmt" + "os" + "os/exec" + "path/filepath" + "strings" + "sync" + "time" + + "github.com/apache/beam/sdks/v2/go/container/tools" +) + +type profilerConfigKeyType int + +const profilerConfigKey profilerConfigKeyType = iota + +// ProfilerConfig holds all pre-computed profiling parameters. +type ProfilerConfig struct { + Enabled bool + Agent string + ExtraArgs []string + ExtraEnvVars []string + Location string + TempLocation string + StopSentinelPath string + GcsDestPath string + UploadIntervalSec int + StopAfterSec int + StopAfterCrash bool + PostprocessIntervalSec int +} + +// setupProfilerConfig parses PipelineOptionsData and stores a resolved ProfilerConfig in the context. +func setupProfilerConfig(ctx context.Context, logger *tools.Logger, opts *PipelineOptionsData) context.Context { + agent := opts.Options.ProfilerAgent + if agent == "" { + return ctx + } + + tempLocation := opts.Options.ProfileTempLocation + if tempLocation == "" { + tempLocation = filepath.Join(*semiPersistDir, "profiles") + } + + jobId := opts.Options.JobId + if jobId == "" { + jobId = "BEAM_JOB" + } + hostname, _ := os.Hostname() + if hostname == "" { + hostname = "default-worker" + } + sentinelPath := filepath.Join(tempLocation, fmt.Sprintf(".profiler_disengaged_%s_%s", jobId, hostname)) + + var gcsDestPath string + if strings.HasPrefix(opts.Options.ProfileLocation, "gs://") { + baseGcsDest := strings.TrimSuffix(opts.Options.ProfileLocation, "/") + gcsDestPath = fmt.Sprintf("%s/%s/%s", baseGcsDest, jobId, hostname) + } + + config := &ProfilerConfig{ + Enabled: true, + Agent: agent, + ExtraArgs: opts.Options.ProfilerExtraArgs, + ExtraEnvVars: opts.Options.ProfilerExtraEnvVars, + Location: opts.Options.ProfileLocation, + TempLocation: tempLocation, + StopSentinelPath: sentinelPath, + GcsDestPath: gcsDestPath, + UploadIntervalSec: opts.Options.ProfileUploadIntervalSec, + StopAfterSec: opts.Options.ProfilerStopAfterSec, + StopAfterCrash: opts.Options.ProfilerStopAfterCrash, + PostprocessIntervalSec: opts.Options.ProfilePostprocessIntervalSec, + } + + return context.WithValue(ctx, profilerConfigKey, config) +} + +// getProfilerConfig extracts the ProfilerConfig from the context. +func getProfilerConfig(ctx context.Context) *ProfilerConfig { + if cfg, ok := ctx.Value(profilerConfigKey).(*ProfilerConfig); ok { + return cfg + } + return nil +} + +// startProfilerBackgroundTasks initializes profiling locations and runs background tasks (GCS sync, post-processing loops) if profiling is enabled. +func startProfilerBackgroundTasks(ctx context.Context, logger *tools.Logger) { + pcfg := getProfilerConfig(ctx) + if pcfg == nil { + return + } + + logger.Printf(ctx, "Worker will be configured with profiler agent enabled.") + logger.Printf(ctx, "ProfilerAgent: %v", pcfg.Agent) + logger.Printf(ctx, "ProfilerExtraArgs: %v", pcfg.ExtraArgs) + logger.Printf(ctx, "ProfilerExtraEnvVars: %v", pcfg.ExtraEnvVars) + logger.Printf(ctx, "ProfileLocation: %v", pcfg.Location) + logger.Printf(ctx, "ProfileTempLocation: %v", pcfg.TempLocation) + logger.Printf(ctx, "ProfileUploadIntervalSec: %v", pcfg.UploadIntervalSec) + logger.Printf(ctx, "ProfilerStopAfterSec: %v", pcfg.StopAfterSec) + logger.Printf(ctx, "ProfilerStopAfterCrash: %v", pcfg.StopAfterCrash) + logger.Printf(ctx, "ProfilePostprocessIntervalSec: %v", pcfg.PostprocessIntervalSec) + if err := os.MkdirAll(pcfg.TempLocation, 0755); err != nil { + logger.Warnf(ctx, "Failed to create ProfileTempLocation: %v", err) + } + + if pcfg.GcsDestPath != "" { + if _, err := exec.LookPath("gcloud"); err != nil { + logger.Errorf(ctx, "gcloud is not available, profiles will not be uploaded.") + } else { + if pcfg.UploadIntervalSec > 0 { + ticker := time.NewTicker(time.Duration(pcfg.UploadIntervalSec) * time.Second) + go func() { + for range ticker.C { + syncProfilesToGCS(ctx, logger, pcfg.TempLocation, pcfg.GcsDestPath) + } + }() + } + } + } + + if pcfg.Agent == "memray" { + go postProcessProfilesLoop(ctx, logger, pcfg.TempLocation, pcfg.PostprocessIntervalSec) + } +} + +// maybeWithProfiler builds the execution arguments and environment variables if profiling is enabled and active. +func maybeWithProfiler( + ctx context.Context, + logger *tools.Logger, + workerId string, + currentProg string, + currentArgs []string, + currentEnv map[string]string, +) (string, []string, map[string]string, bool) { + pcfg := getProfilerConfig(ctx) + if pcfg == nil { + return currentProg, currentArgs, currentEnv, false + } + + if _, err := os.Stat(pcfg.StopSentinelPath); err == nil { + return currentProg, currentArgs, currentEnv, false + } + + prog := currentProg + var args []string + // Copy env + env := make(map[string]string) + for k, v := range currentEnv { + env[k] = v + } + + if pcfg.Agent == "memray" { + timeSuffix := time.Now().Format("20060102150405") + memrayFile := filepath.Join(pcfg.TempLocation, fmt.Sprintf("memray-%s-%s.bin", workerId, timeSuffix)) + args = []string{"-m", "memray", "run"} + args = append(args, pcfg.ExtraArgs...) + args = append(args, "-o", memrayFile, "-m", sdkHarnessEntrypoint) + } else if pcfg.Agent == "tcmalloc" { + tcmallocHeapPath := filepath.Join(pcfg.TempLocation, fmt.Sprintf("tcmalloc-%s", workerId)) + existingPreload := os.Getenv("LD_PRELOAD") + if existingPreload != "" { + env["LD_PRELOAD"] = existingPreload + ":/usr/lib/x86_64-linux-gnu/libtcmalloc.so.4" + } else { + env["LD_PRELOAD"] = "/usr/lib/x86_64-linux-gnu/libtcmalloc.so.4" + } + env["HEAPPROFILE"] = tcmallocHeapPath + args = currentArgs + } else { + prog = pcfg.Agent + args = append(append([]string{}, pcfg.ExtraArgs...), currentProg) + args = append(args, currentArgs...) + } + + for _, envVar := range pcfg.ExtraEnvVars { + parts := strings.SplitN(envVar, "=", 2) + if len(parts) == 2 { + env[parts[0]] = parts[1] + } else { + logger.Errorf(ctx, "Failed to parse profiler extra environment variable: %v. Expected format KEY=VALUE", envVar) + } + } + + return prog, args, env, true +} + +// stopProfiling creates a dummy file at StopSentinelPath to signal that profiling should stop. +func stopProfiling(ctx context.Context) error { + pcfg := getProfilerConfig(ctx) + if pcfg == nil { + return nil + } + f, err := os.Create(pcfg.StopSentinelPath) + if err == nil { + f.Close() + } + return err +} + +// syncProfilesToGCS uploads newly created local memory profiles to the designated GCS target path using gcloud storage. +func syncProfilesToGCS(ctx context.Context, logger *tools.Logger, localDir, gcsDest string) { + entries, err := os.ReadDir(localDir) + if err != nil || len(entries) == 0 { + return + } + + logger.Printf(ctx, "Syncing profiles from %s to %s", localDir, gcsDest) + + cmd := exec.Command("gcloud", "storage", "rsync", localDir, gcsDest) + if err := cmd.Run(); err != nil { + logger.Warnf(ctx, "Failed to sync profiles to GCS: %v", err) + } else { + logger.Printf(ctx, "Successfully synced profiles to GCS.") + } +} + +// postProcessProfilesLoop runs a background loop that periodically triggers profile post-processing if enabled. +func postProcessProfilesLoop(ctx context.Context, logger *tools.Logger, profilesDir string, intervalSec int) { + if intervalSec <= 0 { + return + } + + for { + runPostProcessingSweep(ctx, logger, profilesDir, intervalSec) + + select { + case <-ctx.Done(): + return + case <-time.After(time.Duration(intervalSec) * time.Second): + // Block until the sleep completes before starting the next sweep + } + } +} + +// runPostProcessingSweep scans the profiles directory and launches concurrent postprocessing for newly updated profiles. +func runPostProcessingSweep(ctx context.Context, logger *tools.Logger, profilesDir string, intervalSec int) { + files, err := os.ReadDir(profilesDir) + if err != nil { + return + } + + var wg sync.WaitGroup + for _, file := range files { + name := file.Name() + if !strings.HasSuffix(name, ".bin") || strings.HasPrefix(name, ".") { + continue + } + + binPath := filepath.Join(profilesDir, name) + binInfo, err := os.Stat(binPath) + if err != nil || binInfo.Size() == 0 { + continue + } + + htmlPath := strings.TrimSuffix(binPath, ".bin") + ".html" + htmlInfo, err := os.Stat(htmlPath) + + shouldProcess := false + if os.IsNotExist(err) { + shouldProcess = true + } else if err == nil { + // Don't regenerate when there were no updates to the profile. + if binInfo.ModTime().After(htmlInfo.ModTime().Add(time.Duration(intervalSec) * time.Second)) { + shouldProcess = true + } + } + + if shouldProcess { + wg.Add(1) + go func(bin string) { + defer wg.Done() + + html := strings.TrimSuffix(bin, ".bin") + ".html" + filename := filepath.Base(bin) + + // 1. Peak Flamegraph + cmd1 := exec.CommandContext(ctx, "python", "-m", "memray", "flamegraph", "-f", "-o", html, bin) + if err := cmd1.Run(); err != nil { + logger.Warnf(ctx, "Failed to generate peak flamegraph for %s: %v", filename, err) + } + + // 2. Leaks Flamegraph + leaksHtml := strings.TrimSuffix(bin, ".bin") + "_leaks.html" + cmd2 := exec.CommandContext(ctx, "python", "-m", "memray", "flamegraph", "-f", "--leaks", "-o", leaksHtml, bin) + if err := cmd2.Run(); err != nil { + logger.Warnf(ctx, "Failed to generate leaks flamegraph for %s: %v", filename, err) + } + + logger.Printf(ctx, "Successfully updated flamegraphs for %s (Peak & Leaks)", filename) + }(binPath) + } + } + + wg.Wait() Review Comment: sure, faiir point, sync postprocessing should also work if the profiles are persisted in the semi-persist dir. fixing in new commits -- This is an automated message from the Apache Git Service. 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