I am running the GRPC ASP.NET Core Web API. I want to reduce the multiple thread instance to single thread instance. So I used pstree command to see how many threads it invoked.

This is the output:

  ├─node─┬─bash───dotnet─┬─TestGRPC───25*[{TestGRPC}]
    │           │      │               └─16*[{dotnet}]
    │           │      ├─2*[bash───htop]
    │           │      ├─bash───pstree
    │           │      └─14*[{node}]

We can see that it is invoking 25 thread instance. I tried to reduce it to 4 thread instances using below code. But it didn’t work.

bool isMin = ThreadPool.SetMinThreads(1, 1);
bool isMax = ThreadPool.SetMaxThreads(4, 4);

builder.WebHost.ConfigureKestrel(serverOptions =>
{
    serverOptions.Limits.MaxConcurrentConnections = 1;
});

Here is the output I got after setting the max threads to 4 and min threads to 1

 ├─node───12*[{node}]
    │           ├─node─┬─bash───dotnet─┬─TestGRPC───26*[{TestGRPC}]
    │           │      │               └─23*[{dotnet}]
    │           │      ├─2*[bash───htop]
    │           │      ├─bash───pstree
    │           │      └─14*[{node}]

Could someone please help me to control the number of thread instances invoked by ASP.NET Core Web API?