Sardor Muminov muminoff

Smart URL Redirects in Django

While building [ComicBinder][cb]'s URLs, I wanted a way to differentiate a volume of a title other than one, and a printing of an issue other than one. So, for example, a URL to the second printing of the second volume of Amazing Spider-Man #1 would look like:

/marvel/amazing-spider-man_2/1_2/

That's easy enough with some URLconf wrangling. What I'm talking about today is automatically redirecting a request for _1 in any of those places to the same URL without the _1. While technically correct, I want the lack of underscore + number to mean one, and for there to be only one URL for a resource (someone send me a link to a clever article that talks about this).

django.views.generic.simple.redirect_to to the rescue. Try something like this:

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

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

VP8 vs H.264 - Which One is Better?

So I was reading Hacker News and decided to read the comments in the thread about H.265 being approved. Pretty close to the top was this comment about VP9, Google's future video format. I have some words of my own about it and other future formats at the bottom of this post, but what jumped out from the comment to me was this part:

Many have already implemented VP8 (which is also slightly better than h.264 at this point)

The comparison linked to back up that statement is faulty for several reasons, such as not providing the source material used (hell, he doesn't even name the source material), exact encoding settings used (no, some random profiles are not enough), not providing the resulting encodes, only providing a

	#!/bin/bash

	_testit() {
	printf "running "
	touch .lock
	ant debug install 1> /dev/null
	adb shell 'am start -n com.example.thumbs/.ThumbsActivity' 1> /dev/null
	rm .lock
	echo "Done."
	}

	#!/bin/bash

	# Script for installing tmux on systems where you don't have root access.
	# tmux will be installed in $HOME/local/bin.
	# It's assumed that wget and a C/C++ compiler are installed.

	# exit on error
	set -e

	TMUX_VERSION=1.8

	// Change propagateExpire function in db.c as follows:

	void propagateExpire(redisDb db, robj key) {

	/* HORRIBLE HACK STARTS HERE */
	/* robj argv[2]; /
	robj *argv[3];
	/* HORRIBLE HACK ENDS HERE */

	argv[0] = shared.del;

	from rest_framework import mixins
	from rest_framework.generics import SingleObjectAPIView
	from yourapp.mixins import PartialUpdateModelMixin


	class RetrievePartialUpdateDestroyAPIView(PartialUpdateModelMixin,
	mixins.RetrieveModelMixin,
	mixins.UpdateModelMixin,
	mixins.DestroyModelMixin,
	SingleObjectAPIView):

	# http://www.debian-administration.org/users/dkg/weblog/48
	personal-digest-preferences SHA256
	cert-digest-algo SHA256
	default-preference-list SHA512 SHA384 SHA256 SHA224 AES256 AES192 AES CAST5 ZLIB BZIP2 ZIP Uncompressed

	"""This module sorts a list of results based on a query.

	If there is an intersection between words in the query and a result, it
	is placed near the beginning of the list (based on length of intersection).

	If there is no intersection, the position of the query (substring) in the
	result (string) is used for sorting. These results are placed toward the end
	of the list.
	"""