Turbocharged: Writing High-Performance C# and .NET Code - Steve Gordon

[@ahives]

This is a great talk. I just gave an internal talk on Performance Engineering where I went over BenchmarkDotNet and how I use it to optimize certain algorithms. I also went over the role of microbenchmarking on refactoring designs to be more performant. Needless to say, this talk went over really well. I got this notification on KZbin after I gave my talk so I decided to distribute it internally. Again, excellent talk.

[@joechang8696]

What I would like is for certain objects, typically larger ones, to get an virtual address of some granular size, and allocate from its own set of pages. On dispose, both the VAS and memory pages can be easily recycled. To a degree, this would be like SQL Server, which makes extensive use of 8KB pages. This make it difficult to handle large objects. Hence, for C# at 64-bit, we would like to allocate large chunks of VAS, memory in regular (4K), large pages (2M) or even huge.

[@kevinlettier5273]

Great talk, very informative. The optimized code is really different from the original one and it seems that when you start through that way you cannot easily come back, so to use with care as you mentioned and on critical path. I would love to see on next talk how you can conciliate self documenting approach of the original code and the performance of the optimized one, maybe by decoupling the concrete processing from the orchestration flow ?

[@elerius2]

29:30 Spans in async methods. They should improve the compiler to allow span in async so long as the usage of the span doesn't overlap an async operation. I understand the workaround isn't that difficult, but it "feels bad" to factor the usage out into a separate method. Even if it required introducing an explicit scope to contain the span, it would be an improvement.

[@philipmrch8326]

I agree, I've thought about this solution too.

[@clearlyunwell]

Excellent, thank you!

[@MrMichaeljosiah]

Really good presentation. Very informative

[@GordonGEICO]

"... you'll end up with a StackOverflowException and then you'll end up on Stack Overflow trying to work out why." Which will, inevitably, lead to your question getting closed for being a duplicate, even though none of the links to the (completely unnecessary) third party libraries work because the projects were abandoned long ago.

[@GeorgeTsiros]

SO is a disaster. The SNR is too low.

[@karldavis7392]

I try to group questions asked of the user together. Let's say I have five questions, and need five seconds of processing to handle each. If I ask all five questions back-to-back, then do 25 seconds of processing, the user feels it's faster, because they can go do something else instead of waiting for the app.

[@slavimo]

Instead of String.Join() you could have use StringBuilder instead to get rid of those allocations. So the comparison of String.Join vs StringBuilder vs Span is lacking in your example, IMO.

[@axedaddy1]

And we get all this functionality for three.

[@Adiounys]

31:45 - is testing index before replacing really faster? It seem like it's searching for the space twice.

[@default632]

Test

[@Adiounys]

@@default632 Well I just did. Here are my results 00:00:04.4693173 replace 00:00:06.2901262 indexReplace 00:00:01.6881407 replace[NoSpace] 00:00:01.6519704 indexReplace[NoSpace] 00:00:09.3153027 Replace[LastSpace] 00:00:09.2847721 indexReplace[LastSpace] 00:00:09.3679662 Replace[FirstSpace] 00:00:09.3879821 indexReplace[FirstSpace] 00:00:10.1380442 Replace[long] 00:00:10.0772212 indexReplace[long] And here are input strings I used: testedMethods = new List{ ("replace", ()=>replaceTest("ab cd")), ("indexReplace", ()=>indexReplaceTest("ab cd")), ("replace[NoSpace]", ()=>indexReplaceTest("abcd")), ("indexReplace[NoSpace]", ()=>indexReplaceTest("abcd")), ("Replace[LastSpace]", ()=>indexReplaceTest("Soiqpbiosdssdadsatoeigsdawdqdsadqwcx ")), ("indexReplace[LastSpace]", ()=>indexReplaceTest("Soiqpbiosdssdadsatoeigsdawdqdsadqwcx ")), ("Replace[FirstSpace]", ()=>indexReplaceTest(" Soiqpbiosdssdadsatoeigsdawdqdsadqwcx")), ("indexReplace[FirstSpace]", ()=>indexReplaceTest(" Soiqpbiosdssdadsatoeigsdawdqdsadqwcx")), ("Replace[long]", ()=>indexReplaceTest("Soiqpbiosdssdadsat oeigsdawdqdsadqwcx")), ("indexReplace[long]", ()=>indexReplaceTest("Soiqpbiosdssdadsat oeigsdawdqdsadqwcx")), };

[@lollo4711]

since every cpu-tick counts (money) on cloud computing/hosting those aspects really come (back) into consideration (for years I lost overview/interest how 'fast' my code (really) runs and how much it consumes [on fat clients])

[@odee2004]

How did they get the "not equal" and "less than equal" using only one text/char in Visual studio? @33:25

[@neutralenull]

Using a different font like firacode

[@belowasmelashgebremariam]

Blow

[@Geoters]

At 34:39 code line 117 has c != ' ' but it looks much different. What kind of sorcery is that and how can i do it??

[@WilliamSandersAu]

Had a quick look into this, apparently you have to install a font into Visual Studio that supports ligatures (e.g. Fira Code).

[@Roy192]

There's also a version of consolas that has ligatures: github.com/somq/consolas-ligaturized Just remember to restart visual studio after changing the font.

[@GeorgeTsiros]

@@WilliamSandersAu screw fira code. go with ubuntu mono ligaturized

[@mottahh4162]

wouldn't using a span with strings, if we changed the original string the span will also be changed, also, a slice of a span will be effected by the changes done on the original span

[@dongbinrabbit]

strings are immutable and strings can only be converted to readonly spans.

[@CodeWithSteve]

@@dongbinrabbit Yep exactly!

[@focl2003]

What is the font he's using?

[@ayoubihbibibi2404]

Same question !!!!!

[@focl2003]

@@Flynnor thank you, I'll check it out.

[@Adiounys]

I know Codist can make similar looks marketplace.visualstudio.com/items?itemName=wmj.Codist

[@jr.BoarOfGold]

He's using Fira Code

[@belowasmelashgebremariam]

Baelley

[@belowasmelashgebremariam]

Below

[@belowasmelashgebremariam]

Kofeley

[@belowasmelashgebremariam]

ASME blow

[@belowasmelashgebremariam]

Wellekey

[@CarrotCakeMake]

So it is a slice in Rust.

[@belowasmelashgebremariam]

Allo

[@belowasmelashgebremariam]

Ettay konney

[@belowasmelashgebremariam]

Jegna

[@belowasmelashgebremariam]

Gotta

[@belowasmelashgebremariam]

Hubbeny

[@belowasmelashgebremariam]

Wanna Eye

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Kemey

[@belowasmelashgebremariam]

Kemey me ziarikey

[@belowasmelashgebremariam]

Sllestiom nattey

[@minnedanhieux883]

Nice talk... but comming from c++... meh.

[@belowasmelashgebremariam]

Eweniy

[@belowasmelashgebremariam]

Kemey ke

[@belowasmelashgebremariam]

Nattey

[@belowasmelashgebremariam]

Ewe

[@Esico6]

.net is pretty fast out of the box but if you want performance dont use it. .net will work against you. It can be done but too much workarounds and .net GC tuning. Never use linq on areas where u need perf.

[@hichamo-sfh177]

I don't think so Because linq still highly performance than using a loop and if statements ..

[@ahives]

Hmm. Just curious, have you ever built critical healthcare systems that operate at scale before? I co-maintain the most performant healthcare parser in the world that executes in nanoseconds/microseconds and it uses LINQ and other functional programming concepts. In my experience your statement is not valid. If you are curious, here it is github.com/MassTransit/Machete.

.net is pretty fast out of the box but if you want performance dont use it

@@hichamo-sfh177 Take a look : github.com/microsoft/referencesource/blob/master/System.Core/System/Linq/Enumerable.cs Why do you think it is faster than loop and if statements if they are just that?

[@belowasmelashgebremariam]

Sellestiom

[@belowasmelashgebremariam]

Reay

[@belowasmelashgebremariam]

Baelley