std.parallelism Question

[Jonathan Crapuchettes]

Thank you for your quick reply. I am now starting to see how it should be used.

As a little bit of encouragement, your code is being used in in-house 
applications doing millions to trillions of calculations that are creating 
leading edge economic data.

Thank you again,
Jonathan

dsimcha wrote:
> == Quote from Jonathan Crapuchettes (jcrapuchettes at gmail.com)'s article
>> I've been looking at your std.parallelism module and am really interested in it,
>> but there is one problem that I have run into that I can't seem to find a
>> solution. If I have code that requires a database connection in each thread, I
>> don't really want to be creating and then deleting a lot (e.g. 500,000) of
>> connections while using taskPool.parallel. Normally I would create a set of
>> objects that extend Thread and create a single connection in each. Can you offer
>> a suggestion how I might handle this situation?
>
> These kinds of situations are **exactly** what worker-local storage is for.  Roughly:
>
> // new MysqlConnection() is lazy, you get one per worker thread.
> auto connections = taskPool.workerLocalStorage(new MysqlConnection());
>
> foreach(element; taskPool.parallel(array)) {
>      // Get the worker-local instance of connection.
>      auto connection = connections.get;
>
>      // Do stuff.
> }
>
> // Now that we're done with the parallel part of the algorithm,
> // we can access all the connections to free them.
>
> foreach(c; connections.toRange) {
>      c.free();
> }