[tech] pprof: dump malloc profile

[volgariver6]

User description

What type of PR is this?

• API-change
• BUG
• Improvement
• Documentation
• Feature
• Test and CI
• Code Refactoring

Which issue(s) this PR fixes:

issue #18096

What this PR does / why we need it:

pprof: dump malloc profile

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PR Type

Enhancement

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Description

• Added functionality to dump malloc profiles in the cmd/mo-service/debug.go file.
• Introduced a new function saveMallocProfile to handle the dumping of malloc profiles.
• Integrated the malloc profile dumping process into the existing saveProfiles function.
• Implemented WriteProfileData function in pkg/common/malloc/default.go to facilitate writing malloc profile data.

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Changes walkthrough 📝

Relevant files

Enhancement

debug.go Add malloc profile dumping functionality                                  cmd/mo-service/debug.go Added imports for bytes, compress/gzip, context, and malloc. Implemented saveMallocProfile function to dump malloc profile. Integrated malloc profile dumping into the saveProfiles function. +37/-2    default.go Implement WriteProfileData for malloc profiling                    pkg/common/malloc/default.go Added WriteProfileData function to write malloc profile data. Imported io package for writing operations. +5/-0

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PR Reviewer Guide 🔍

⏱️ Estimated effort to review: 2 🔵🔵⚪⚪⚪

🧪 No relevant tests

🔒 No security concerns identified

⚡ Key issues to review Error Handling The error from w.Close() in saveMallocProfile() is not logged or handled properly. Resource Management The context created for the file write operation might benefit from a more specific timeout value or being derived from a parent context.

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PR Code Suggestions ✨

Category	Suggestion	Score
Error handling	Handle and log errors when closing the gzip writer Consider handling the error returned by w.Close(). If an error occurs while closing the gzip writer, it could lead to incomplete or corrupted data being written to the profile. cmd/mo-service/debug.go [442-444] if err := w.Close(); err != nil { + logutil.GetGlobalLogger().Error("failed to close gzip writer", zap.Error(err)) return } Apply this suggestion Suggestion importance[1-10]: 8 Why: Handling and logging errors when closing the gzip writer is important to ensure data integrity and to provide visibility into potential issues, making this a valuable improvement.	8
Logging	Add logging for successful profile saving Consider adding a log message to indicate successful saving of the malloc profile. This would provide better visibility into the process and confirm when the operation completes successfully. cmd/mo-service/debug.go [459-461] if err := globalEtlFS.Write(ctx, writeVec); err != nil { logutil.GetGlobalLogger().Error("failed to save malloc profile", zap.Error(err)) +} else { + logutil.GetGlobalLogger().Info("malloc profile saved successfully", zap.String("path", profilePath)) } Apply this suggestion Suggestion importance[1-10]: 7 Why: Adding a log message for successful operations improves visibility and debugging, making it a useful enhancement for maintainability.	7
Performance	Use a more appropriate timeout duration for the context Consider using a more specific context timeout for the file write operation. Three minutes might be excessive for writing a profile, and a shorter timeout could help identify performance issues more quickly. cmd/mo-service/debug.go [457] -ctx, cancel := context.WithTimeout(context.TODO(), time.Minute*3) +ctx, cancel := context.WithTimeout(context.TODO(), time.Second*30) Apply this suggestion Suggestion importance[1-10]: 6 Why: While a shorter timeout could help identify performance issues, the appropriate duration depends on the expected write time, and the current timeout may be intentional, so this suggestion is less critical.	6
Documentation	Add a comment explaining the function's purpose Consider adding a brief comment explaining the purpose of the WriteProfileData function. This would improve code readability and maintainability. pkg/common/malloc/default.go [149-151] +// WriteProfileData writes the current malloc profile data to the provided io.Writer. func WriteProfileData(w io.Writer) error { return globalProfiler.Write(w) } Apply this suggestion Suggestion importance[1-10]: 5 Why: Adding comments enhances code readability and maintainability, but it is a minor improvement compared to functional changes.	5