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@brouhaha
brouhaha / Keywords.py
Last active November 5, 2021 16:10
Keywords helper class for PyParsing
#!/usr/bin/env python3
#
# Copyright (c) 2021 Eric Smith
# SPDX-License-Identifier: MIT
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
@Lothiraldan
Lothiraldan / udp_listener.py
Created October 25, 2012 10:06
Multiple UDP listener on the same port
import socket
# Socket part
ANY = "0.0.0.0"
MCAST_ADDR = "237.252.249.227"
MCAST_PORT = 1600
#create a UDP socket
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
#allow multiple sockets to use the same PORT number
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1)
@jboner
jboner / latency.txt
Last active June 20, 2024 08:50
Latency Numbers Every Programmer Should Know
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