Excessive memory usage using endpoint.MapControllerRoute (up to 4GB) for Routes Candidates #30092
Description
Describe the bug
Using the MapControllerRoute function with various route templates the server memory explodes in the order of GB.
A project with about 1K of Controllers and each with 30/40 Actions, with a dozen MapControllerRoute endpoints can weight up to 3GB.
We are not using the RouteAttribute decorations, but attributing the routes with MapControllerRoute, for a precise choice and for compatibility with NET.
app.UseEndpoint(endpoint => {
endpoint.MapControllerRoute({
name: "RouteName",
pattern: "api/{controller}/{action}",
});
...
endpoint.MapControllerRoute({
name: "RouteName",
pattern: "api/{controller}/{id}/{action}",
})
..
});
The memory is almost completely occupied by the Microsoft.AspNetCore.Mvc.ModelBinding.Metadata.DefaultModelMetadata class and the internal routing dictionaries.
If, instead of with the UseEndpoint, the same identical routes are linked with UseMvc, there is not problems, and the application has a normal use of RAM (<500MB in Debug, 150MB in Release)
// this works without leak
app.UseMvc(route => {
route.MapRoute(
name: name,
template: routeTemplate,
defaults: defaults,
constraints: constraints);
});
To Reproduce
To replicate the problem I created a test project, with 1k controller with 30 actions, and I defined a series of Route patterns, and the RAM usage is also excessive, reaching 3GB.
Exceptions (if any)
No Exceptions was thrown
Further technical details
- ASP.NET Core 5 (tested also on 3.1, with same results)
- Visual Studio 2019
- Include the output of
dotnet --info
dotnet --info
.NET SDK (che rispecchia un qualsiasi file global.json):
Version: 5.0.102
Commit: 71365b4d42
Ambiente di runtime:
OS Name: Windows
OS Version: 10.0.17763
OS Platform: Windows
RID: win10-x64
Base Path: C:\Program Files\dotnet\sdk\5.0.102\
Host (useful for support):
Version: 5.0.2
Commit: cb5f173b96
.NET SDKs installed:
2.1.202 [C:\Program Files\dotnet\sdk]
2.1.500 [C:\Program Files\dotnet\sdk]
2.1.801 [C:\Program Files\dotnet\sdk]
2.2.401 [C:\Program Files\dotnet\sdk]
3.1.401 [C:\Program Files\dotnet\sdk]
5.0.100 [C:\Program Files\dotnet\sdk]
5.0.102 [C:\Program Files\dotnet\sdk]
.NET runtimes installed:
Microsoft.AspNetCore.All 2.1.6 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.All 2.1.12 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.All 2.1.23 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.All 2.2.6 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.All 2.2.8 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
Microsoft.AspNetCore.App 2.1.6 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 2.1.12 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 2.1.23 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 2.2.6 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 2.2.8 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 3.1.7 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 3.1.9 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 5.0.0 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 5.0.2 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
Microsoft.NETCore.App 2.0.9 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.1.6 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.1.12 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.1.23 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.2.6 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 2.2.8 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 3.1.7 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 3.1.9 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 5.0.0 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.NETCore.App 5.0.2 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
Microsoft.WindowsDesktop.App 3.1.7 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 3.1.9 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 5.0.0 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
Microsoft.WindowsDesktop.App 5.0.2 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]