How to set memory in golang

In the Go programming language, setting memory usually refers to using functions in the runtime package to set memory limits. The runtime package is one of Go's standard libraries, providing interfaces and functions for accessing the Go runtime system, such as garbage collection, coroutine management, memory allocation, etc. Before using the runtime package to set memory, we need to understand how to obtain the memory information of the current Go program.

Get the memory information of the current Go program

There are two ways to obtain memory information in the Go program:

1. Use the function in the runtime package.

The functions in the runtime package can obtain the current memory status of the Go program, including memory allocation, usage, garbage collection and other information. The following is the function to obtain the memory status:

• func ReadMemStats(m *MemStats) // Read the memory status
• type MemStats struct // Memory status structure

2. Use the functions in the os package.

The functions in the os package can obtain the system memory information used by the Go program, including process memory usage, total physical memory, virtual memory and other information. The following is the function to obtain system memory information:

• func (s *Statm_t) Format(f fmt.State, c rune) // Get process memory information
• func MemTotal() (uint64, error) // Get the total physical memory of the system
• func VirtualMemory() (*VirtualMemoryStat, error) // Get the system virtual memory information

Set memory limit

During the running of the Go program, we can use the functions in the runtime package to set the memory limit. Setting the memory limit is to prevent the Go program from using too much memory, causing the system to run out of memory. The following is the function to set the memory limit:

• func SetMaxStack(bytes uintptr) // Set the maximum stack memory
• func SetMaxMallocBytes(bytes uintptr) // Set the maximum memory allocation

Among them, the SetMaxStack function is used to set the maximum stack memory limit; the SetMaxMallocBytes function is used to set the maximum memory allocation limit.

In addition, we can also use the environment variable GO_MEMPROFILE to set the memory allocation information output. After setting the GO_MEMPROFILE environment variable, the Go runtime will output memory allocation and usage to the specified file for easy analysis and optimization.

Summary

In the Go programming language, setting memory limits is to prevent the Go program from using too much memory, resulting in insufficient system memory. We can use the functions in the runtime package to set memory limits, and we can also use the environment variable GO_MEMPROFILE to output memory information. In order to ensure the stability and robustness of the program, we need to set memory limits at appropriate times and perform necessary memory optimization.

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