| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| golang.org/x/net/context | Package context defines the Context type, which carries deadlines, cancellation signals, and other request-scoped values across API boundaries and between processes. |
| google.golang.org/grpc | Package grpc implements an RPC system called gRPC. |
| google.golang.org/grpc/benchmark/grpc_testing | |
| google.golang.org/grpc/benchmark/latency | Package latency provides wrappers for net.Conn, net.Listener, and net.Dialers, designed to interoperate to inject real-world latency into network connections. |
| google.golang.org/grpc/benchmark/stats | Package stats tracks the statistics associated with benchmark runs. |
| google.golang.org/grpc/grpclog | Package grpclog defines logging for grpc. |
| io | Package io provides basic interfaces to I/O primitives. |
| net | Package net provides a portable interface for network I/O, including TCP/IP, UDP, domain name resolution, and Unix domain sockets. |
| sync | Package sync provides basic synchronization primitives such as mutual exclusion locks. |
| testing | Package testing provides support for automated testing of Go packages. |
| time | Package time provides functionality for measuring and displaying time. |