Brice Dutheil bric3

GPG and git on macOS

Setup

No need for homebrew or anything like that. Works with https://www.git-tower.com and the command line.

Install https://gpgtools.org -- I'd suggest to do a customized install and deselect GPGMail.
Create or import a key -- see below for https://keybase.io
Run gpg --list-secret-keys and look for sec, use the key ID for the next step
Configure git to use GPG -- replace the key with the one from gpg --list-secret-keys

Codebreaker

Implement a simple program that match the requirements below.

The game

Code breaking is all about finding the secret code.

When the game starts the player should be able to guess the secret code by providing a 4 digits number. The game finishes when the player have found the exact match for the secret code.

The fastest remote directory rsync over ssh archival I can muster (40MB/s over 1gb NICs)

This creates an archive that does the following:

rsync (Everyone seems to like -z, but it is much slower for me)

a: archive mode - rescursive, preserves owner, preserves permissions, preserves modification times, preserves group, copies symlinks as symlinks, preserves device files.
H: preserves hard-links
A: preserves ACLs

Locate the section for your github remote in the .git/config file. It looks like this:

[remote "origin"]
	fetch = +refs/heads/*:refs/remotes/origin/*
	url = [email protected]:joyent/node.git

Now add the line fetch = +refs/pull/*/head:refs/remotes/origin/pr/* to this section. Obviously, change the github url to match your project's URL. It ends up looking like this:

	$ sudo dmidecode

	# dmidecode 2.12
	# SMBIOS entry point at 0x000f0000
	SMBIOS 2.8 present.

	<SNIP>

	Handle 0x0000, DMI type 0, 24 bytes
	BIOS Information

	final Context ctx = vertx.currentContext();

	otherLibrary.doSomethingAsync("foo", new Runnable() {
	public void run() {
	// This will be executed on the other library's thread so we need to make sure the result is done on the correct context
	ctx.runOnContext(new Handler<Void>() {
	public void handle(Void v) {
	// Now we are on the right context - use the Vert.x API as normal
	request.response().end("blah");
	}

	sudo defaults write /Library/Preferences/com.apple.windowserver DisplayResolutionEnabled -bool YES;
	sudo defaults delete /Library/Preferences/com.apple.windowserver DisplayResolutionDisabled;

	// by the way, you need to logout and log back in for this to take effect. Or at least that's what
	// Quartz Debug says. Who knows, maybe it's lying?

	// P.S. Go to [Apple menu --> System Preferences --> Displays --> Display --> Scaled] after logging
	// back in, and you'll see a bunch of "HiDPI" resolutions in the list to choose from.

	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