Profile Go CPU and Memory Usage with pprof
The most surprising thing about Go's pprof is how little instrumentation it actually needs to give you a crystal-clear picture of your application's per.
Golang Articles
71 articles
Find Data Races in Go with the Race Detector
The Go race detector doesn't actually find data races; it detects potential data races by observing memory access patterns.
Build a Token Bucket Rate Limiter in Go
A token bucket rate limiter can actually increase throughput for bursty traffic by allowing short spikes that exceed the average rate.
When to Use and Avoid Reflection in Go
Reflection is a powerful tool in Go, but using it incorrectly can lead to performance issues and code that's difficult to understand.
Harden Go Applications: Security Checklist
Go applications are surprisingly easy to secure, but most developers miss the forest for the trees by focusing on individual vulnerabilities instead of .
Integrate Go Services with Envoy and Service Mesh Sidecars
Integrate Go Services with Envoy and Service Mesh Sidecars — practical guide covering golang setup, configuration, and troubleshooting with real-world e...
How Go Slices Grow: Length, Capacity, and Underlying Arrays
A Go slice's capacity isn't just a suggestion; it's a hard limit on how many elements you can add to the slice before Go has to make a whole new, bigger.
Go String vs []byte Performance: When Each One Wins
Go String vs []byte Performance: When Each One Wins — practical guide covering golang setup, configuration, and troubleshooting with real-world examples.
Add Structured Logging to Go Apps with slog
Add Structured Logging to Go Apps with slog — Go's log/slog package, introduced in Go 1.21, fundamentally shifts how we think about logging by tre.
Use Go sync.Mutex, RWMutex, and WaitGroup Correctly
Use Go sync.Mutex, RWMutex, and WaitGroup Correctly — Go's sync.Mutex and sync.RWMutex aren't just about preventing race conditions; they're about control.
Write Table-Driven Tests and Benchmarks in Go
Go's testing package is famously simple, but its table-driven test and benchmark pattern is a masterclass in expressive power.
Configure TLS and Mutual Auth in Go HTTP Servers
The most surprising thing about TLS and mutual authentication in Go is that you're often better off not using the standard http.
Go vs Rust: Choose the Right Language for Your Project
Go and Rust are both modern, performant languages designed for systems programming, but they approach similar problems with vastly different philosophie.
Write Zero-Allocation Go Code for Performance-Critical Paths
Go's garbage collector is often cited as a performance bottleneck, but a surprising amount of high-performance Go code is effectively zero-allocation.
Fix Go "Imported and Not Used" Compilation Errors
Fix Go "Imported and Not Used" Compilation Errors — practical guide covering golang setup, configuration, and troubleshooting with real-world examples.
Fix Go "Label Defined and Not Used" Compilation Errors
The Go compiler flagged a label defined and not used error because you've declared a goto or for/switch label, but your code never actually jumps to it.
Fix Go "Module Declares Its Path As" Mismatch Errors
The Go toolchain broke because a module declared its own path in its go. mod file, but the directory structure on disk where that module was found didn'.
Fix Go "Multiple Value in Single Value Context" Errors
This error means you tried to assign the result of a function that returns multiple values to a single variable, or use it in a place that only expects .
Fix Go "No New Variables on Left Side of :=" Errors
The := operator in Go is failing because you're trying to use it to assign a value to a variable that has already been declared in the same scope.
Fix Go "Non-Name on Left Side of :=" Assignment Errors
The := operator in Go is failing because you're trying to use it with something that isn't a new variable declaration on the left-hand side.
Fix Go "Not Enough Arguments in Call to" Errors
The Go compiler is throwing a "not enough arguments in call to" error because you're trying to call a function or method without providing all the requi.
Fix Go panic: runtime error: index out of range
The Go runtime is panicking because a program is trying to access an element in a slice or array using an index that doesn't exist within its valid boun.
Fix Go "Runtime: Goroutine Stack Exceeds 1GB Limit"
The Go runtime panicked because a single goroutine's stack grew too large, exceeding the 1GB limit, which indicates a potential infinite recursion or ex.
Fix Go "Struct Field in Non-Struct Type" Errors
Fix Go "Struct Field in Non-Struct Type" Errors — practical guide covering golang setup, configuration, and troubleshooting with real-world examples.
Fix Go "Too Many Arguments in Call to" Errors
This error means the Go compiler found a function call where the number of arguments provided didn't match the number of parameters the function expects.
Fix Go "Type-Checking Loop Involving" Errors
The Go compiler got stuck trying to figure out the types of two or more Go types that were circularly defined, and it couldn't resolve them.
Fix Go "Undefined Function in Package" Compilation Errors
The Go compiler is reporting an "undefined function" error because it can't find a specific function within a package you're trying to use.
Fix Go "Imported and Not Used" Undefined Symbol Errors
This error means the Go compiler found a symbol like a variable, function, or type that your code declared it wanted to use, but it couldn't find the ac.
Fix Go "Undefined Method for Type" Compilation Errors
The Go compiler is throwing an "undefined method" error because a type you're using doesn't actually have the method you're trying to call on it.
Fix Go "Undefined Variable" Compilation Errors
The Go compiler is complaining about an "undefined variable" because it can't find a symbol variable, function, type, etc.
Fix Go "Use of Internal Package Not Allowed" Import Errors
The Go compiler is refusing to allow your program to import packages marked as internal. This error, "use of internal package not allowed," means you're.
Fix Go "Ambiguous Import" Found in Multiple Modules
The Go compiler failed because two different packages, both imported by your code, provided the same identifier a function, type, or variable with the s.
Fix Go Build Constraints Excluding All Files
The Go build system is rejecting all files in your package because a //go:build directive is too restrictive, effectively telling the compiler to ignore.
Fix Go "Declared and Not Used" Variable Errors
The Go compiler is flagging variables that have been declared but never read, indicating a potential logic error or leftover debugging code.
Fix Go "No Go Files" Build Errors in Empty Packages
The Go build system is failing to find any source files when it encounters a package that should contain Go code, but appears empty.
Fix Go "go.sum Mismatch" Hash Verification Errors
Fix Go "go.sum Mismatch" Hash Verification Errors — The go.sum file is failing verification because a dependency's cryptographic hash doesn't match what.
Fix Go Test Flag Ordering Errors
The Go testing framework's flag package is failing to parse flags correctly when they are passed in an order that deviates from the expected sequence, l.
Use Atomic Operations vs Mutex in Go for Safe Concurrency
Go's sync/atomic package allows for low-level, hardware-supported atomic operations, which are often a more performant alternative to traditional mutexe.
Reduce Go Binary Size for Production and Container Images
Go binaries can be surprisingly large, even for simple "hello world" programs, which can bloat your production containers and increase deployment times.
Manage Go Modules and Workspaces in Large Codebases
Go modules are how Go manages dependencies, but they can get tricky in large codebases. Here's a look at how they work in practice, using a simple multi.
The Real Performance Cost of CGo in Go Applications
CGo doesn't just add a tiny overhead; it fundamentally changes how your Go program interacts with the outside world, and that interaction can become a s.
How Go Channels Work Internally and When to Use Each Pattern
Go channels are more than just queues; they're a fundamental mechanism for inter-goroutine communication, enabling safe and concurrent data sharing.
Implement a Circuit Breaker in Go for Resilient Services
Implement a Circuit Breaker in Go for Resilient Services — practical guide covering golang setup, configuration, and troubleshooting with real-world exa...
Generate Code at Build Time with go:generate and Templates
go:generate is a build-time code generation tool that lets you automate repetitive tasks, but its real power comes from combining it with Go's text/temp.
Build a Worker Pool in Go with Goroutines and Channels
Go's concurrency model lets you build a worker pool where independent tasks are processed concurrently, but not too concurrently.
Handle Context Cancellation and Deadlines Correctly in Go
Handle Context Cancellation and Deadlines Correctly in Go — A context.Context in Go isn't a magic wand for managing timeouts; it's a responsibility pass...
Tune Go database/sql Connection Pools for Production
Go's database/sql package, often assumed to be a simple wrapper, is actually a sophisticated connection manager that can make or break your application'.
Dependency Injection in Go: Wire vs Manual Construction
Wire is a compile-time dependency injection framework for Go that generates dependency injection code, making manual DI feel like a relic of the past.
Embed Static Files into Go Binaries with //go:embed
Embed Static Files into Go Binaries with //go:embed — practical guide covering golang setup, configuration, and troubleshooting with real-world examples.
How Go Escape Analysis Decides Between Stack and Heap Allocation
Go's escape analysis is surprisingly aggressive about putting things on the stack, even when you might expect them to live on the heap.
Configure Go Structs Flexibly with the Functional Options Pattern
The functional options pattern lets you configure Go structs with a variable number of optional parameters, bypassing the common pitfalls of constructor.
Find Bugs Automatically with Go Fuzz Testing
Go's fuzzing isn't just about finding crashes; it's a powerful tool for discovering unexpected behavior and logic errors in your code.
How the Go Garbage Collector Works: Tricolor Marking Explained
The Go garbage collector isn't a background process that periodically pauses your application; it's an integral part of every goroutine, constantly work.
Use Go Generics in Production: Patterns and Pitfalls
Go generics are more powerful than you might think, enabling truly reusable code without sacrificing performance or type safety.
How the Go Runtime Goroutine Scheduler Works
The Go runtime doesn't actually run your goroutines directly; it multiplexes them onto a smaller, fixed number of OS threads.
Shut Down Go Services Gracefully Without Dropping Requests
Shut Down Go Services Gracefully Without Dropping Requests — practical guide covering golang setup, configuration, and troubleshooting with real-world e...
Build Production gRPC Services in Go
Build Production gRPC Services in Go — practical guide covering golang setup, configuration, and troubleshooting with real-world examples.
How the Go net/http Server Handles Requests Internally
How the Go net/http Server Handles Requests Internally — practical guide covering golang setup, configuration, and troubleshooting with real-world examp...
Use HTTP/2 Server Push and Streaming in Go
Use HTTP/2 Server Push and Streaming in Go — practical guide covering golang setup, configuration, and troubleshooting with real-world examples.
How Go Interfaces Work Internally with itab
How Go Interfaces Work Internally with itab. Go interfaces are a bit of a magic trick, and the itab is where the spell is cast. Let's see it in action
Senior Go Engineer Interview Questions and Answers
Senior Go Engineer Interview Questions and Answers — practical guide covering golang setup, configuration, and troubleshooting with real-world examples.
Write Kubernetes Controllers in Go with controller-runtime
The most surprising thing about Kubernetes controllers is that they don't "control" anything directly; they just observe the desired state and reconcile.
How Go Maps Work and Why They're Not Safe for Concurrent Use
Go maps are a fundamental data structure, but their seemingly simple interface hides a complex, dynamic implementation that relies on a hash table.
Find and Fix Memory Leaks in Go Applications
A Go application is leaking memory because the garbage collector can't reclaim objects that are still referenced, even though they are no longer logical.
The Go Memory Model Explained: Happens-Before and Sync Primitives
The Go memory model is surprisingly simpler than you might think, and it's not about when memory is written, but about what order operations are guarant.
Build Go Microservices with Service Discovery and gRPC
The most surprising thing about building Go microservices with gRPC and service discovery is how much of the "magic" is just well-defined interfaces and.
Write HTTP Middleware in Go with net/http and Chi
HTTP middleware in Go, when done right, isn't just about adding checks; it's about composing independent, single-purpose functions that build up your re.
Structure a Go Monorepo for Multiple Services
A Go monorepo for multiple services isn't just about putting code in one place; it's a deliberate architectural choice that fundamentally changes how yo.
Why Go time.Now() Uses a Monotonic Clock
Why Go time.Now() Uses a Monotonic Clock — The surprising truth is that time.Now in Go doesn't always give you the wall-clock time. Let's see t.
Instrument Go Services with OpenTelemetry for Distributed Tracing
OpenTelemetry is not just about tracing; it's the future of observability, aiming to standardize how we collect telemetry data across all your services,.
Build a Plugin System in Go with Interfaces or Go Plugins
Go's plugin system is surprisingly flexible, letting you load code after your main application has already started, without recompiling anything.