get system total memory in go

You can use the runtime and os packages in Go to get the system's total memory. Here's an example:

main.go
package main

import (
    "fmt"
    "runtime"
    "syscall"
)

func main() {
    var info syscall.Sysinfo_t
    if err := syscall.Sysinfo(&info); err != nil {
        panic(err)
    }
    totalMem := info.Totalram * uint64(info.Unit)
    fmt.Printf("Total memory: %v bytes\n", totalMem)
}
290 chars
17 lines

In this example, we're using the Sysinfo function from the syscall package to get information about the system. We're then using the Totalram and Unit fields from the Sysinfo_t struct to calculate the total memory in bytes. Finally, we're printing out the total memory using fmt.Printf.