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This is not about multi-threading in the sense of using threads in PHP, but is instead about fork()'ing new php processes. This is called multi-process programm

• vital101 16y ago
  True. Although each new process is a new thread of execution right?
  • scrame 16y ago
    No, threads and processes are different. Threads are pieces of concurrent execution with a shared state from the containing process. Processes are heavier pieces of execution, they have their own memory and state, get a distinct PID. fork() is a system level command that copies the current process wholesale, and then gives a pointer back to the parent process. This is very different than an interpreter managed green thread (ala ruby 1.8), or a true concurrent in-process threading model (like JVM threads). Basically, processes tend to be heavier-weight, but more isolated and secure, where threads tend to be faster and can work with shared state without needing to use IPC mechanisms. Quick googling found this discussion: http://stackoverflow.com/questions/807506/threads-vs-processes-in-linux http://stackoverflow.com/questions/807506/threads-vs-process...