What is the malloc threshold of Map object? How to modify it?

In Go, the malloc threshold is a runtime parameter that determines the size at which the Go runtime switches from using stack allocation to heap allocation for certain objects, including map objects. The threshold is based on the size of the object being allocated.

As of my knowledge cutoff in September 2021, the default malloc threshold for map objects is 8 bytes per element. This means that if the estimated size of a map (key-value pairs and other overhead) is less than 8 bytes per element, the map will be allocated on the stack. Otherwise, it will be allocated on the heap.

For example, a map[int]int with a few elements would likely be allocated on the stack, while a map[string]string with many key-value pairs would probably be allocated on the heap.

As of my knowledge cutoff date, you cannot directly modify the malloc threshold for map objects in Go. The threshold is determined by the Go runtime and is not a configurable parameter that you can set via environment variables or flags.

It’s important to note that Go’s memory management, including the decision to allocate objects on the stack or heap, is handled automatically by the Go runtime and is designed to be efficient and performant. The choice of stack or heap allocation is based on various factors, including the size of the object and its lifetime.

If you are concerned about the memory usage or performance of your code, it’s best to focus on writing clear, idiomatic Go code, and let the Go runtime handle memory management for you. Additionally, you can use profiling and benchmarking tools provided by Go to identify and address any performance bottlenecks in your code.

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