Speed test of file copy

Speed test of file copy: 1 GB random data file.

Linux:
2.7 GHz Intel Core i5-5257U
4 GB 1333 MHz DDR3
Realtek RTL8111 PCIe GbETH
CentOS 7

local copy: 6~9 sec, typical 8.5 sec ==> ~100 MBps
copy from SSD to USB: typical 20~21 sec ==> ~50 MBps
copy from USB to SSD: typical 5~10 sec ==> ~100 MBps


Mac:
MacBook 12-inch 2016
1.1 GHz Intel Core m3
8 GB 1867 MHz LPDDR3
macOS Sierra 10.12.6
5 GHz wireless network

SCP from Linux SSD to Mac: 20 sec ==> ~50 MBps
SCP from Mac to Linux SSD: 55~65 sec ==> ~16 MBps
SCP from Linux USB to Mac: 20 sec ==> ~50 MBps
SCP from Mac to Linux USB: 55~65 sec ==> ~16 MBps