rsarai

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

rsarai

[error]
ImportError: No module named '_gdbm'
[solved]
sudo apt-get install python3.5-gdbm
[error]
ImportError: No module named 'apt_pkg'
[solved]
locate apt_pkg.so
sudo ln -s /usr/lib/python3/dist-packages/apt_pkg.cpython-34m-x86_64-linux-gnu.so /usr/lib/python3/dist-packages/apt_pkg.so