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README
SideTask
SideTask is an alternative to Elixir's Task.Supervisor that uses Basho's sidejob library for better parallelism and to support capacity limiting of Tasks.
Elixir's Task.Supervisor
is implemented as a single :simple_one_for_one
supervisor with the
individual Task
s as children. This means starting a new task has to go through this single
supervisor. Furthermore there is no limit to the number of workers that can be running at the same
time.
Basho's sidejob library spawns multiple supervisors (one for each scheduler by default) and uses ETS tables to keep track of the number of workers, thereby making it possible to start workers in parallel while also putting an upper bound on the number of running workers.
SideTask provides an API similar to Task.Supervisor
, with the addition that all calls that
start a new task require a sidejob resource as argument and can return {:error, :overload}
.
Convenience functions for adding and deleting sidejob resources are provided.
Example 1
SideTask.add_resource(:example1, 50)
potential_tasks = for i <- 1..100 do
case SideTask.async(:example1, fn -> :timer.sleep(1000); i end) do
{:ok, task} ->
IO.puts "Task #{i} created"
task
{:error, :overload} ->
IO.puts "Task #{i} not created, overloaded"
nil
end
end
IO.inspect for task = %Task{} <- potential_tasks, do: Task.await(task)
Example 2
# Erlang spawns one scheduler per CPU core by default
schedulers = :erlang.system_info(:schedulers)
SideTask.add_resource(:example2, schedulers * 2)
for scheduler <- 1..schedulers do
spawn_link fn ->
for i <- Stream.iterate(0, &(&1+1)) do
SideTask.start_child :example2, fn ->
:timer.sleep(250);
IO.inspect scheduler: scheduler, count: i
end
end
end
end
License
This software is licensed under [the MIT license](LICENSE).
About
This project is maintained and funded by PSPDFKit.
See our other open source projects, read our blog or say hello on Twitter (@PSPDFKit).
*Note that all licence references and agreements mentioned in the sidetask README section above
are relevant to that project's source code only.