$ show google/pprof
pprof is a mature, production-grade profiling visualization and analysis tool for Go, C++, Java, and other languages that export profiles in the pprof protobuf format. It operates as both a command-line tool and an interactive web server, allowing users to inspect CPU, memory, contention, and goroutine profiles. The core architecture is a modular Go application: the `driver` package orchestrates fetching, symbolization, merging, and report generation; the `profile` package provides a standalone library for reading, writing, and manipulating profiles; the `graph` package builds weighted directed call graphs; and the `report` package outputs a variety of formats including text, SVG dot graphs, HTML flame graphs, annotated source, disassembly, and more. External dependencies include binutils (addr2line, nm, objdump) for local symbolization, Graphviz (dot) for graph rendering, and optionally Chrome for browser tests. The system supports profile comparison, filtering by tags or sample labels, and can symbolize using local binaries or remote symbolz services. The profile package is designed for reuse as a standalone library, making pprof useful both as a tool and as a data processing foundation for other profiling tooling.
The LLM identified 5 files worth highlighting for reuse:
Defines the core Profile, Sample, Location, Function, and Mapping data structures, along with methods for parsing, writing, merging, scaling, and filtering profiles. This package is designed as a standalone library and can be reused by any tool that needs to manipulate pprof profiles without pulling in the rest of the pprof codebase.
Builds directed graphs from profile samples, handling node/edge weighting, trimming, and entropy-based ordering for visual importance. The graph construction logic is decoupled from output formatting, making it reusable as a generic digraph builder for profiling data with minimal modification.
Provides scaling and human-readable formatting of profile sample values (e.g., bytes, nanoseconds, counts) with automatic unit selection. This small self-contained utility can be extracted for any project needing smart unit formatting.
Parses ELF program headers to compute memory base addresses, extract build IDs, and handle ASLR and kernel virtual addresses. This standalone component is reusable for any ELF binary analysis task, such as symbolization or relocation.
Implements a custom HTTP RoundTripper that supports the `https+insecure` URL scheme for TLS connections without certificate verification. This small, self-contained transport layer can be reused in any Go HTTP client that needs to bypass TLS validation for internal or testing purposes.