Scout APM uses tracing logic that ties bottlenecks to source code so you know the exact line of code causing performance issues and can get back to building a great product faster.
Compare libev and C++ Actor Framework's popularity and activity
|libev||C++ Actor Framework|
|-||7 months ago|
|5 months ago||4 days ago|
|GNU General Public License v3.0 or later||BSD 3-clause "New" or "Revised" License|
|Asynchronous Event Loop||Concurrency, Distributed|