CppCon 2014: Chandler Carruth "Efficiency with Algorithms, Performance with Data Structures"

So Hi there, everyone.

My name is Chandler Carruth.

I work for Google

I work on our C++ language platform

I work on our C++ compilers

specifically our

This is going to be kind of an intro

You can heckle me

We're going to

And the first thing

How many folks here think that

Everyone thinks that it's important

I'm going to tell you why I care about performance

Most of it comes down

I actually really

I think he encapsulates

Software is getting slower more rapidly than hardware is getting faster

The hardware will catch up

It turns

We're really good at

It's hard to

And so it's important to

And to give you an idea of

I have to mention, he actually wrote

I did not actually realize thi

We're going to come back to

So, how many foks

Anyone?

It's a good book

Okay. I actually think that the idea that software is getting

And for a parti

There was a pretty similar event

how we look at computing devices

and this event was the iPhone

When Steve Jobs

But he was

Mobile was

It took the world

But that's what happened

We now have to care about

And we essentially

You have to choose one

We're going to choose small

The other problem

What do we do about the battery

How many folks here have charged their phone today

That's a problem.

That's not a feature, that's a bug.

How many

We've entered

Power became relevant

Power efficient instructions

Optimizing for power usage

Because this is mostly total junk science.

Here is the number one

Finish running the program

The faster your software runs, the lest

If I run

But it's not, okay?

Here's the thing.

We've only

We figured out how to turn them off.

if you have a

the way it conserves power is by turning itself off

The more

So we actually want to make code faster

There are some extreme exceptions to it

But 99.999999% of the time

But batteries aren't the only

You'll note that

The only thing it is doing is taking electricity and turning it into heat.

That is it's job

And unfortunately, electricity costs a lot of money

And so power becomes very, very important

And I find it interesting