* Add an upper number of maximum parallel runtime api requests
Instead of spawning all runtime api requests in the background and using
all wasm instances. This pr adds a maximum number of parallel requests.
* Update node/core/runtime-api/src/lib.rs
Co-authored-by: Sergei Shulepov <sergei@parity.io>
* Review feedback
* Increase instances
* Add warning
* Update node/core/runtime-api/src/lib.rs
Co-authored-by: Sergei Shulepov <sergei@parity.io>
Co-authored-by: Sergei Shulepov <sergei@parity.io>