Louis de Charsonville louisdecharson

Latency numbers every programmer should know

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

	(defun python-google-docstring ()
	"Generate google-style docstring for python."
	(interactive)
	(if (region-active-p)
	(progn
	(call-process-region (region-beginning) (region-end) "python3" nil t t "/home/szobov/bin/scripts/format-g-docs.py")
	(message "Docs are generated")
	(deactivate-mark))
	(message "No region active; can't generate docs!"))
	)

	#!/bin/bash
	#This script searches the Downloads folder for NBER working papers (PDFs starting with "w2") and renames them in "Author - Title (NBER Year)"" format.

	cd ~/Downloads
	papers=$(find . -name "w2[0-9]*.pdf" \| sed 's/^.\//\ /' \| sed 's/.pdf//' \| tr -d '\n')
	echo "$papers"
	for wp in $papers
	do
	curl https://www.nber.org/papers/$wp.ris > temp.txt
	grep 'AU' temp.txt \| awk -F- '{print $2}' \| awk -F, '{printf $1 ","}' > temp2.txt