[Script Info]
Title: 
[Events]
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Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,So Hi there, everyone.
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,My name is Chandler Carruth.
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,I work for Google
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,I work on our C++ language platform
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,I work on our C++ compilers
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,specifically the Clang and ?
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,And I'm here to talk to you a little about performance.
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,and efficiency, and making code fast,
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,and all the different things that go into that.
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,But before I do too much
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,I want to give actually give you guys a little bit of a
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,one might say are expectations.
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,Because I have been reading the twitter feed
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,from all these folks, that talk about all these crazy good questions
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,I just want you guys to essentially know this is my view
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,of what Performance 101 should be.
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,Okay? This is going to be kind of an intro talk.
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,You guys are hard core, really deep performance nuts.
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,You may be a little bit bored, and please be kind,
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,because I'm going to gloss over some things
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,you could go into thoroughly if you really want to
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,We're going to talk about efficiency, performance,
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,algorithms and data structures.
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,And the first thing we are going to do is we're not going to talk about them.
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,We're going to talk about why anyone cares about them.
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,How many folks here think it's really important to have high performance in C++? Like certain that it's super important?
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,Everyone thinks it's important!
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,And the folks here have a really clear idea why performance is important.
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,Now, all the people who didn't raise their hands the second time,
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,Please reconsider raising your hand the first time.
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,We actually need to understand why performance is important in C++,
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,before we actually decide it's important, we're going to care a lot about it.
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,I'm going to tell you why I care about performance in C++.
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,Most of it comes down to a quote from Nicolas Werth.
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,Which I will try to pronounce correctly but fail miserably.
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,I actually really like a lot of our stuff,
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,I think he really encapsulates a lot of my thoughts about the philosophy of software here.
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,The software is getting slower more rapidly than (1:58)
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,But that's what happened
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,We now have to care about
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,And we essentially
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,You have to choose one
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,We're going to choose small
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,The other problem
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,What do we do about the battery
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,How many folks here have charged their phone today
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,That's a problem.
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,That's not a feature, that's a bug.
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,How many
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,We've entered
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,Power became relevant
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,Power efficient instructions
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,Optimizing for power usage
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,Because this is mostly total junk science.
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,Here is the number one
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,Finish running the program
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,The faster your software runs, the lest
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,If I run
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,But it's not, okay?
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,Here's the thing.
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,We've only
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,We figured out how to turn them off.
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,if you have a
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,the way it conserves power is by turning itself off
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,The more
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,So we actually want to make code faster
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,There are some extreme exceptions to it
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,But 99.999999% of the time
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,But batteries aren't the only
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,You'll note that
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,The only thing it is doing is taking electricity and turning it into heat.
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,That is it's job
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,And unfortunately, electricity costs a lot of money
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,And so power becomes very, very important
Dialogue: 0,9:59:59.99,9:59:59.99,Default,,0000,0000,0000,,And I find it interesting