[Linux] 測速隨身碟速度 test usb disk throughput

測速隨身碟速度:

# 強制 kernel 清理快取
echo 1 > /proc/sys/vm/drop_caches

# Write
echo "dd if=/dev/zero of=/mnt/usb/sda1/test.bin bs=1024 count=716800"
date;dd if=/dev/zero of=/mnt/usb/sda1/test.bin bs=1024 count=716800;sync;date

echo "================================================================="

# 強制 kernel 清理快取
echo 1 > /proc/sys/vm/drop_caches

# Read
echo "dd if=/mnt/usb/sda1/test.bin of=/dev/null bs=1024 count=716800"
date;dd if=/mnt/usb/sda1/test.bin of=/dev/null bs=1024 count=716800;sync;date