# Advanced Go (Go)

> Compiler internals, runtime, scheduler, cgo, unsafe package, assembly, build tags

- 20 interview questions
- Senior
- [Interview Questions: Go](https://sharpskill.dev/en/technologies/go/interview-questions.md)

## 1. Which Go toolchain tool allows inspecting the assembly code generated by the compiler?

**Answer**

The go tool compile -S command displays the assembly code generated by the Go compiler. This tool is essential for understanding compiler optimizations and analyzing performance-critical code. It is also possible to use go build -gcflags=-S to achieve the same result during a standard build.

## 2. What is the main purpose of the unsafe package in Go?

**Answer**

The unsafe package allows bypassing Go's type system to perform low-level memory operations. It exposes functions like Pointer, Sizeof, Alignof, and Offsetof that enable direct memory address manipulation. Its use is discouraged except for specific cases like interoperability with C code or critical optimizations.

## 3. How does the Go scheduler (GPM) organize goroutine execution?

**Answer**

The Go scheduler uses the GPM model: G represents goroutines, P represents logical processors (GOMAXPROCS), and M represents system threads. Each P has a local run queue of goroutines. When an M is blocked on a syscall, the P can be detached and associated with another M to continue goroutine execution. This design enables efficient scheduling with minimal context switches.

## 17 more questions available

- What is cgo and in which context should it be used?
- Which directive allows conditionally compiling code based on target OS or architecture?

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## Other Go interview topics

- [Go Basics](https://sharpskill.dev/en/technologies/go/interview-questions/go-basics.md): 25 questions, Junior
- [Go Data Structures](https://sharpskill.dev/en/technologies/go/interview-questions/go-data-structures.md): 20 questions, Junior
- [Go Interfaces](https://sharpskill.dev/en/technologies/go/interview-questions/go-interfaces.md): 18 questions, Junior
- [Error Handling](https://sharpskill.dev/en/technologies/go/interview-questions/error-handling.md): 20 questions, Junior
- [Goroutines Basics](https://sharpskill.dev/en/technologies/go/interview-questions/goroutines-basics.md): 20 questions, Junior
- [Channels](https://sharpskill.dev/en/technologies/go/interview-questions/channels.md): 22 questions, Junior
- [Go Modules](https://sharpskill.dev/en/technologies/go/interview-questions/go-modules.md): 18 questions, Mid-Level
- [HTTP Server](https://sharpskill.dev/en/technologies/go/interview-questions/http-server.md): 24 questions, Mid-Level
- [HTTP Client](https://sharpskill.dev/en/technologies/go/interview-questions/http-client.md): 18 questions, Mid-Level
- [JSON Encoding](https://sharpskill.dev/en/technologies/go/interview-questions/json-encoding.md): 20 questions, Mid-Level
- [Database/SQL](https://sharpskill.dev/en/technologies/go/interview-questions/database-sql.md): 22 questions, Mid-Level
- [Context Package](https://sharpskill.dev/en/technologies/go/interview-questions/context-package.md): 20 questions, Mid-Level
- [Testing](https://sharpskill.dev/en/technologies/go/interview-questions/testing.md): 22 questions, Mid-Level
- [Concurrency Patterns](https://sharpskill.dev/en/technologies/go/interview-questions/concurrency-patterns.md): 24 questions, Mid-Level
- [Sync Primitives](https://sharpskill.dev/en/technologies/go/interview-questions/sync-primitives.md): 22 questions, Mid-Level
- [Go Web Frameworks](https://sharpskill.dev/en/technologies/go/interview-questions/go-web-frameworks.md): 20 questions, Mid-Level
- [REST API Design](https://sharpskill.dev/en/technologies/go/interview-questions/rest-api-design.md): 20 questions, Mid-Level
- [gRPC](https://sharpskill.dev/en/technologies/go/interview-questions/grpc.md): 22 questions, Mid-Level
- [Reflection](https://sharpskill.dev/en/technologies/go/interview-questions/reflection.md): 20 questions, Senior
- [Memory Management](https://sharpskill.dev/en/technologies/go/interview-questions/memory-management.md): 24 questions, Senior
- [Performance Optimization](https://sharpskill.dev/en/technologies/go/interview-questions/performance-optimization.md): 22 questions, Senior
- [Generics](https://sharpskill.dev/en/technologies/go/interview-questions/generics.md): 20 questions, Senior
- [Go Design Patterns](https://sharpskill.dev/en/technologies/go/interview-questions/design-patterns.md): 24 questions, Senior
- [Microservices](https://sharpskill.dev/en/technologies/go/interview-questions/microservices.md): 24 questions, Senior
- [Security & Authentication](https://sharpskill.dev/en/technologies/go/interview-questions/security-authentication.md): 24 questions, Senior
- [Docker & Containerization](https://sharpskill.dev/en/technologies/go/interview-questions/docker-containerization.md): 20 questions, Senior
- [Kubernetes Basics](https://sharpskill.dev/en/technologies/go/interview-questions/kubernetes-basics.md): 22 questions, Senior
- [CLI Development](https://sharpskill.dev/en/technologies/go/interview-questions/cli-development.md): 20 questions, Senior

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