The compiler will optimize that away

Post by vips7L » Mon, May 03, 2021, 1:12 PM UTC

moonchild wrote: post #26

Const-me wrote: post #24

Disagree about garbage collected runtimes. A lot of widely used software is written in C or C++ and uses malloc/free extensively (C++ new/delete is mostly a wrapper around it). This results in memory layout worse than an equivalent managed heap would be. Happens because the memory allocated on C heap is immovable, while garbage collectors may move data around to defragment the heap.

Actually... https://arxiv.org/pdf/1902.04738.pdf On a more serious note, most c programs I see don't do very much of that, preferring to allocate fixed-size buffers on the stack. Additionally, most GC'd languages that aren't java have crappy GCs, and those GC'd languages that are java lack value types. This harms spatial locality quite a bit, and compaction can't fully compensate for that. They are working on adding…

Post by meheleventyone » Mon, May 03, 2021, 1:23 PM UTC

rhn_mk1 wrote: post #27

lordnacho wrote: post #13

Good article. My own thinking when coding performance is also towards data oriented approaches. For example Bevy in Rust. If stuff needs to be fast, it needs to be in cache. To do that, have everything nicely packed so you only ask for a chunk as often as you need. Then when you need it, it's already there. Thing about old fashioned OO is it's often fine enough for your run-of-the-mill CRUD app. If you look at the la…

To elaborate on Bevy: the data-oriented approach used is called an Entity Component System.

Post by tonyarkles » Mon, May 03, 2021, 1:27 PM UTC

jayd16 wrote: post #183

corysama wrote: post #133

Earlier quoted context omitted.

People forget that Winamp was instant on a 60Mhz machine with a spinning rust drive. It’s difficult to buy a computer that slow these days. Modern CPUs modulate their speeds by far more than that as part of their moment by moment power management!

Winamp didn't stream all music in existence over the internet. How is it really comparable?

Post by city41 » Mon, May 03, 2021, 1:36 PM UTC

goatinaboat wrote: post #208

esailija wrote: post #87

Earlier quoted context omitted.

I disagree. Almost all software I use these days is absurdly slower than it should be and probably a massive drain on collective productivity. I have ssd, fast internet, 64gb ddr4 etc, almost everything I do should be impercetibly instant but instead takes seconds and even minutes. Yeah of course most of that slowness is not even because of ignorance of the low level stuff but complete disregard of performance aspect…

Almost all software I use these days is absurdly slower than it should be and probably a massive drain on collective productivity Productivity, energy usage, e-waste in landfill as people are forced to upgrade in order to do simple tasks with the current software... The world is paying a high price for programmer laziness.

Post by reynhaim » Mon, May 03, 2021, 1:41 PM UTC

29athrowaway wrote: post #130

esailija wrote: post #87

Earlier quoted context omitted.

I disagree. Almost all software I use these days is absurdly slower than it should be and probably a massive drain on collective productivity. I have ssd, fast internet, 64gb ddr4 etc, almost everything I do should be impercetibly instant but instead takes seconds and even minutes. Yeah of course most of that slowness is not even because of ignorance of the low level stuff but complete disregard of performance aspect…

Shit is slower than it was in the 90s. Spotify is slower than Winamp, Slack is slower than IRC, Webmail is slower than my e-mail client, VS Code is slower than Visual C++ 6.0.