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Many Kokkos functions have instrumentation hooks defined within the framework of Kokkos::Tools. These instrumentation hooks allow Kokkos::Tools as well as third-party tracing, profiling and testing tools to register callbacks to monitor and interact with the runtime behavior of the program. In this presentation, we will describe several utilities that we have designed to help manage such callbacks. We have implemented a manager class that can register function objects that can listen to such callbacks. And we have implemented several such function objects, such as an event recorder, an event counter, and a kernel timer that uses event stream synchronization markers on device backends. We will illustrate these utilities through their use in benchmarking, profiling, and unit testing of a Kokkos-based finite-element code.
