Can you explain what the GMP pattern is and how it is used?

The GMP (Go Memory Pool) pattern in Go is an approach to memory management through object pools, which allows reusing already allocated objects instead of constantly creating and deleting new ones. This reduces the load on the garbage collector and improves performance, especially when working with a large number of similar objects.

How it works:

• An object pool is created (for example, using sync.Pool).
• When needed, an object is taken from the pool if available, or a new one is created.
• After use, the object is returned to the pool for reuse.

Example of using sync.Pool:

var bufPool = sync.Pool{
    New: func() interface{} {
        return new(bytes.Buffer)
    },
}

func process() {
    buf := bufPool.Get().(*bytes.Buffer)
    buf.Reset()
    // use buf
    bufPool.Put(buf)
}

This approach reduces the number of allocations and garbage collections, which is beneficial in high-load applications.