Drew Barnes

Learning transfer is taking what we learn in one context and applying it to another. It can be taking a kernel of what we learn in school or in a book and applying it to the “real worl…

Doing many small writes can hurt performance. Each write is ultimately a syscall and if doing frequently can put burden on the CPU. Devices like disks work better dealing with block-aligned data. To avoid the overhead of many small write operations Golang is shipped with bufio.Writer. Data, instead of going straight to destination (implementing io.Writer interface) are first accumulated inside the buffer and send out when buffer is full:

Streaming data directly from a reader is easy. Method Read is designed to be called within a loop where, with each iteration, it reads a chunk of data from the source and places it into buffer p. This loop will continue until the method returns an io.EOF error.