Re: Running a function at fixed time intervals

On 22/11/13 07:02, [email protected] wrote:
> Hello,
> Here is what i am trying to achieve in Grinder:
>
> I have 1 agent, 1 worker, 50 threads. 
> I have a static dictionary that is common to all the threads. I want to
> update that dictionary every half an hour. Is there a way to do it. Any
> alternative way is also fine as long as i achieve the target.

You may need to provide more information. I'm guessing your worker
threads need to use the dictionary as a source of test data, or perhaps
to look up whether a response is valid, and that your half-hourly update
is the only thing that writes to the dictionary.

With a single process, its straightforward. You need to worry about
concurrent access to the dictionary when it is being updated. I'd do
something like this...

    from java.util.concurrent.atomic import AtomicReference

    # Atomic reference to hold a snapshot of the dictionary
    dictionary = AtomicReference({"a":1, "b":2})

    def update():
      newDictionary = .. read from file? ...
      dictionary.set(newDictionary)


    # reading from the dictionary

        a = dictionary.get()["a"]


Then use Python's threading.Timer, or Java's ScheduledThreadPoolExecutor
to run update() every 30 minutes.

- Phil

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