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Chapter 6 Invocation, Invocation: A local process takes place within local memory and may involve a few tens of instruction cycles. Invocation of a remote process involves network activeies and possibly access to files, and may require billions of instruction cycles in processors running at speeds measured in gigahertz. These invocation activities are external to the desired processing activities and increase costs without adding value. Concurrent To reduce the number of messages sent to establish the connection and to continue processing while communicating instead of suspending threads until a message is received., Invocation: A local process takes place within local memory and may involve a few tens of instruction cycles. Invocation of a remote process involves network activeies and possibly access to files, and may require billions of instruction cycles in processors running at speeds measured in gigahertz. These invocation activities are external to the desired processing activities and increase costs without adding value. Latency Null invocation costs are the delays required to set up communications and the non-goal performing overhead of invocations. These fixed overhead costs measure the latency of the connection. Substantial efforts go into minimizing and reducing latency cost in distributed applications.