They do. After the cold start, things are just run in memory. Java for example will keep your static variables and such in memory, and keep /tmp until you have

They do. After the cold start, things are just run in memory. Java for example will keep your static variables and such in memory, and keep /tmp until you haven't called the lambda for a while. With GoLang, they call start your program, and just call the handler method as required.