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would probably need to do specific tests trying to do the same with span and with pointers. I was just curious if span is faster than pointers or just something that can be as fast but remains safe contrary to pointers.
also for example what non obvious problems can arise from doing unsafe? obvious ones are these that c programmers know about accessing things by pointers... Also there is this gc pinning stuff that span seems not to need, probably because it uses managed pointers whenever it can...
in some cases it can be optimized away
I would start with span and only use pointers if you see a perf issue
(and then measure again because maybe your change didn't improve anything)
I understand that span is safer, that's the whole point. I was just wondering what is more unsafe in the unsafe code except the same things that are problematic in C language when using pointers. like accessing stuff over the bounds, accessing outright wrong addresses, accessing null, wrongly reinterpreting pointers, etc. also is span access to array faster than access to the same array directly, like when I am not doing things like slicing? or it is only a wrapper for the array in this case to make things universal? I know it does not require pinning the array.
hmm ok you probably wouldn't be able to use it. I believe that the span accesses array using a byref, without even using the normal object reference.
and so it needs a managed pointer to the array that you probably cannot get normally
actually is access to an object reference faster than access via a managed pointer like that? or the only reason a managed pointer is used is so that you have one code path for wrapping a managed pointer via span, and wrapping an array via span? because managed pointers can point to unmanaged stuff contrary to object references... that is how I understand it
access to a managed pointer faster than object reference but nvm. I would guess there is no difference except managed pointers can contain more values
oh i love that stuff. :D
I probably just understood why the System.Memory cannot be used directly and must be converted to span, or at least that is what I think I saw
probably speed again, because if you would use Memory directly then it would be like ArraySegment...
I don't understand why I have InvalidOperationException: Role Customer does not exist error in my signin POST action. The user was inserted in the user table and this error is throw at line 43 of https://paste.ofcode.org/3sT46YfkQ54YecnZj6gf8n
My startup is like that https://paste.ofcode.org/8259fPkVATEesiji8iXqys
See my dbcontext too: https://paste.ofcode.org/SLhPikWLJmJGquePCbZdQ6
an idea?
Code build fine but the SignIn api method failed with this error. I have seed Roles at the db context creating ; the user is created too. But i don't have anything else into db tables...
ok thks for the channel ;)
The only difference between a managed pointer and an object ref is how GC handles it -- managed pointer is more expensive as GC must filter out non-GC heap pointers, and if the pointer is pointing in the GC heap, GC must "backtrack" to find the start of the object. For codegen, they behave more or less the same.
I am trying to create self-contained application for testing my local CoreFx build as per this documentation https://github.com/dotnet/corefx/blob/master/Documentation/project-docs/dogfooding.md#option-2-self-contained
I have downloaded the nightly build and am doing the steps in 'self-contained' section (above link). However the dotnet restore gives me following errors. Appreciate help with the same. Thanks!!!
D:\Home\Test>dotnet restore
D:\Home\Test\Test.csproj : error NU1102: Unable to find package Microsoft.AspNetCore.App.Runtime.win-x64 with version (= 5.0.0-alpha1.19459.39)
D:\Home\Test\Test.csproj : error NU1102: - Found 24 version(s) in dotnetcore-feed [ Nearest version: 3.0.0-preview4-19121-14 ]
D:\Home\Test\Test.csproj : error NU1102: - Found 6 version(s) in nuget.org [ Nearest version: 3.0.0-preview9.19424.4 ]
D:\Home\Test\Test.csproj : error NU1102: - Found 0 version(s) in Microsoft Visual Studio Offline Packages
D:\Home\Test\Test.csproj : error NU1102: - Found 0 version(s) in CliFallbackFolder
Restore failed in 138.21 ms for D:\Home\Test\Test.csproj.
ah, that doc only lists the dotnet-core feed. you need the aspnetcore feed as well: https://dotnetfeed.blob.core.windows.net/aspnet-aspnetcore/index.json
Actually, I realized the mistake. I started with using latest 5.x nightly build is 5.x series. Creation of new project using
dotnet new console threw up list of templates to use, which I could not figure out. Hence used native 3.x to create project as mentioned in docs; but the generated csproj file had TargetFramework set to netcoreapp3.0. Changing that to netcoreapp5.0 resolved all the errors. Thanks!
@FluentGuru Wrong room :) InterfaceMethod isn't perfect, it's something that I'd like to improve soon. We can continue in https://gitter.im/dotnet/orleans
If you have a repro for it, though, please open an issue & I'll try to address it
@Wraith2 regarding
anyone know where/if the docs for ref assembly generation are? - this might help: https://github.com/dotnet/corefx/blob/master/Documentation/coding-guidelines/updating-ref-source.md
a thought. could you use simd to speed up switch statements with multiple cases. for example i'm looking at a switch which maps 6 byte values to the same block of code. the case values aren't sequential so at the moment it's going to generate code to compare against each of those 6. but what if I put all 6 in a vector and then said is the input byte equal to any of the items in a second vector. it'd do the switch in a single instruction wouldn't it? which would speed up a lot of state machines.