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

NDC Conferences
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In this session, you'll learn how to write C# code which executes faster and allocates less. This session is packed with practical examples and demos of where the latest high-performance APIs and language features can be applied in your applications.
During this session, we'll apply types such as Span and Memory to efficiently process data and to parse strings. We'll examine System.IO.Pipelines, offering high-performance I/O and we'll utilise ArrayPool to help reduce GC allocations. In .NET Core 3.0, we have new high-performance JSON APIs which we'll also add to our arsenal. Microsoft has made fantastic performance gains to the .NET Core framework; now it's time to apply them to your code!
We'll begin by discussing when and why performance matters in your applications. You'll learn how to measure your code, and use a data-driven approach to focus your optimisations.
These features can seem complicated, unapproachable and difficult to apply. In this session, Steve introduces high-performance newcomers to the features, showing you how they work, where they can be applied and how to measure performance improvements in your code.
This talk is for developers, who like Steve, are ready to begin their journey towards writing faster .NET code, which allocates less.
Check out more of our talks, courses, and conferences in the following links:
ndcconferences.com/
ndc-london.com/

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6 июл 2024

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Комментарии : 59   
@ahives
@ahives 4 года назад
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 RU-vid after I gave my talk so I decided to distribute it internally. Again, excellent talk.
@clearlyunwell
@clearlyunwell 4 года назад
Excellent, thank you!
@kevinlettier5273
@kevinlettier5273 4 года назад
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 ?
@joechang8696
@joechang8696 4 года назад
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.
@MrMichaeljosiah
@MrMichaeljosiah 4 года назад
Really good presentation. Very informative
@elerius2
@elerius2 4 года назад
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
@philipmrch8326 4 года назад
I agree, I've thought about this solution too.
@Adiounys
@Adiounys 4 года назад
31:45 - is testing index before replacing really faster? It seem like it's searching for the space twice.
@default632
@default632 4 года назад
Test
@Adiounys
@Adiounys 4 года назад
@@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")), };
@odee2004
@odee2004 4 года назад
How did they get the "not equal" and "less than equal" using only one text/char in Visual studio? @33:25
@neutralenull
@neutralenull 3 года назад
Using a different font like firacode
@karldavis7392
@karldavis7392 Год назад
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.
@axedaddy1
@axedaddy1 3 года назад
And we get all this functionality for three.
@Geoters
@Geoters 4 года назад
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
@WilliamSandersAu 4 года назад
Had a quick look into this, apparently you have to install a font into Visual Studio that supports ligatures (e.g. Fira Code).
@Roy192
@Roy192 4 года назад
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
@GeorgeTsiros 2 года назад
@@WilliamSandersAu screw fira code. go with ubuntu mono ligaturized
@slavimo
@slavimo 3 года назад
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.
@GordonGEICO
@GordonGEICO 3 года назад
"... 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
@GeorgeTsiros 2 года назад
SO is a disaster. The SNR is too low.
@lollo4711
@lollo4711 4 года назад
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])
@focl2003
@focl2003 4 года назад
What is the font he's using?
@ayoubihbibibi2404
@ayoubihbibibi2404 4 года назад
Same question !!!!!
@focl2003
@focl2003 4 года назад
@@Flynnor thank you, I'll check it out.
@Adiounys
@Adiounys 4 года назад
I know Codist can make similar looks marketplace.visualstudio.com/items?itemName=wmj.Codist
@jr.BoarOfGold
@jr.BoarOfGold 4 года назад
He's using Fira Code
@mottahh4162
@mottahh4162 4 года назад
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
@dongbinrabbit 4 года назад
strings are immutable and strings can only be converted to readonly spans.
@CodeWithSteve
@CodeWithSteve 4 года назад
@@dongbinrabbit Yep exactly!
@belowasmelashgebremariam
@belowasmelashgebremariam 2 года назад
Blow
@CarrotCakeMake
@CarrotCakeMake 4 года назад
So it is a slice in Rust.
@belowasmelashgebremariam
@belowasmelashgebremariam 2 года назад
ASME blow
@belowasmelashgebremariam
@belowasmelashgebremariam 2 года назад
Wellekey
@belowasmelashgebremariam
@belowasmelashgebremariam 2 года назад
Below
@belowasmelashgebremariam
@belowasmelashgebremariam 2 года назад
Ettay konney
@belowasmelashgebremariam
@belowasmelashgebremariam 2 года назад
Baelley
@belowasmelashgebremariam
@belowasmelashgebremariam 2 года назад
Allo
@belowasmelashgebremariam
@belowasmelashgebremariam 2 года назад
Kofeley
@belowasmelashgebremariam
@belowasmelashgebremariam 2 года назад
Gotta
@belowasmelashgebremariam
@belowasmelashgebremariam 2 года назад
Hubbeny
@belowasmelashgebremariam
@belowasmelashgebremariam 2 года назад
Jegna
@belowasmelashgebremariam
@belowasmelashgebremariam 2 года назад
Kemey
@belowasmelashgebremariam
@belowasmelashgebremariam 2 года назад
Wanna Eye
@belowasmelashgebremariam
@belowasmelashgebremariam 2 года назад
Kemey me ziarikey
@belowasmelashgebremariam
@belowasmelashgebremariam 2 года назад
Kemey ke
@belowasmelashgebremariam
@belowasmelashgebremariam 2 года назад
Sllestiom nattey
@belowasmelashgebremariam
@belowasmelashgebremariam 2 года назад
Eweniy
@belowasmelashgebremariam
@belowasmelashgebremariam 2 года назад
Nattey
@minnedanhieux883
@minnedanhieux883 3 месяца назад
Nice talk... but comming from c++... meh.
@belowasmelashgebremariam
@belowasmelashgebremariam 2 года назад
Ewe
@Esico6
@Esico6 4 года назад
.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
@hichamo-sfh177 4 года назад
I don't think so Because linq still highly performance than using a loop and if statements ..
@ahives
@ahives 4 года назад
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.
4 года назад
.net is pretty fast out of the box but if you want performance dont use it
4 года назад
@@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
@belowasmelashgebremariam 2 года назад
Sellestiom
@belowasmelashgebremariam
@belowasmelashgebremariam 2 года назад
Baelley
@belowasmelashgebremariam
@belowasmelashgebremariam 2 года назад
Reay
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