mfenniak

import os.path
import contextlib
import hashlib
from flask import Flask
from flask.helpers import safe_join

# Injects an "h" parameter on the URLs of static files that contains a hash of
# the file.  This allows the use of aggressive cache settings on static files,
# while ensuring that content changes are reflected immediately due to the
# changed URLs.  Hashes are cached in-memory and only checked for updates when

jboner

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