A computer hardware system configured to perform runtime analysis and runtime control of a multithreaded computer program includes at least one processor. The at least one processor is configured to initiate and/or perform the following. A plurality of the threads are folded, under control of a supervisor thread, together to be executed as a single folded thread. The execution of the folded thread is monitored to determine a status of the threads. At least one indicator corresponding, to the determined status of the threads, is presented in a user interface.