Apparatuses, systems, and techniques are directed to automatic coalescing of GPU-initiated network communications. In one method, a communication engine receives, from a shared memory application executing on a first graphics processing unit (GPU), a first communication request assigned to or having a second GPU as a destination to be processed. The communication engine determines that the first communication request satisfies a coalescing criterion and stores the first communication request in association with a group of requests that have a common property. The communication engine coalesces the group of requests into a coalesced request and transports the coalesced request to the second GPU over a network.