Standard escape codes are prefixed with Escape
:
- Ctrl-Key:
^[
- Octal:
\033
- Unicode:
\u001b
- Hexadecimal:
\x1B
- Decimal:
27
sudo apt-get update | |
sudo apt-get upgrade | |
sudo apt-get dist-upgrade | |
sudo apt-get install htop | |
sudo apt-get install build-essential | |
sudo apt-get install libncurses-dev | |
sudo apt-get install libssl-dev | |
sudo apt-get install bc | |
sudo apt-get install linux-source | |
sudo -s |
L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns
Compress 1K bytes with Zippy ............. 3,000 ns = 3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns = 20 µs
SSD random read ........................ 150,000 ns = 150 µs
Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs
Latency Comparison Numbers (~2012) | |
---------------------------------- | |
L1 cache reference 0.5 ns | |
Branch mispredict 5 ns | |
L2 cache reference 7 ns 14x L1 cache | |
Mutex lock/unlock 25 ns | |
Main memory reference 100 ns 20x L2 cache, 200x L1 cache | |
Compress 1K bytes with Zippy 3,000 ns 3 us | |
Send 1K bytes over 1 Gbps network 10,000 ns 10 us | |
Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD |