Using mmap in go can stall goroutines. VM includes workaround that depends on cgo, but alpine package is built without cgo. Disabling mmap may yield better performance. See: https://github.com/VictoriaMetrics/VictoriaMetrics/blob/baedb25936669179fa726639e267a52d8cdfedc2/lib/fs/copy_mmap_nocgo.go#L7