Rodrigo Kumpera, Miguel de Icaza May 17, 2017 runtime Concurrent GC In Mono 5.0 we are shipping a new operation mode for our Garbage Collector: Concurrent Garbage Collection. Traditionally, when Mono’s memory manager determined that it should perform a garbage collection, the collector had to pause all Mono running threads, perform the garbage collection, and once it was done, it resumed the execu