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@kfox
kfox / tcpproxy.js
Created April 5, 2012 20:03
A basic TCP proxy written in node.js
var net = require("net");
process.on("uncaughtException", function(error) {
console.error(error);
});
if (process.argv.length != 5) {
console.log("usage: %s <localport> <remotehost> <remoteport>", process.argv[1]);
process.exit();
}
@jboner
jboner / latency.txt
Last active June 18, 2025 10:55
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