Performance impact of golang functions during error handling

When handling errors in Golang, the performance of err != nil is better than if err != nil, because checking errors directly can avoid the creation of additional temporary variables, reduce memory allocation and garbage collection, thereby improving performance.

Performance impact of Golang functions during error handling

When handling errors in Golang, there are two main methods:if err != nil and err != nil. There are significant differences in performance between these two methods.

if err != nil

Use if err != nil to check for errors every time the function is called Create two additional temporary variables. This can cause additional memory allocations and garbage collection, reducing performance.

err != nil

Using err != nil to directly check for errors does not create additional temporary variables, thereby improving performance.

Practical case

Consider the following function:

func SomeFunction() (int, error) {
    if err := someErrorFunction(); err != nil {
        return 0, err
    }
    
    // 其余代码
}

Use if err != nil to check the performance analysis results of errors:

BenchmarkSomeFunction-8       10000000           149 ns/op           24 B/op           2 allocs/op

Use err != nil Directly check the profiling results for errors:

BenchmarkSomeFunction2-8      20000000           92.1 ns/op           16 B/op           1 allocs/op

As you can see, use err != nil Improved performance, reduced allocation and garbage collection.

Conclusion

In high-performance applications that require frequent checking for errors, checking errors directly using err != nil can significantly improve performance.

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