Increase max client task / outgoing call concurrency to 500K in Bound…

…edExecutor (MystenLabs/narwhal#1033)

Before we make a decision on whether and how to remove the BoundedExecutor, it seems useful to increase the max concurrency limit significantly so we are not running into it as often. Blocking on BoundedExecutor is potentially one source of deadlock we have observed.

narwhal/network/src/lib.rs

@@ -52,7 +52,7 @@ impl<T> std::future::Future for CancelOnDropHandler<T> {
 //
 // The exact number here probably isn't important, the key things is that it should be finite so
 // that we don't create unbounded numbers of tasks.
-pub const MAX_TASK_CONCURRENCY: usize = 500;
+pub const MAX_TASK_CONCURRENCY: usize = 500_000;
 
 pub fn multiaddr_to_address(
     multiaddr: &multiaddr::Multiaddr,