IIS Express Threadpool Exceptions

Diagnosis.cs

int workers;
int completions;
System.Threading.ThreadPool.GetMaxThreads(out workers, out completions);

Fix.cs

// When webengine4.dll first starts, it sets the max thread pool size to an artificially low number, and it depends 
// on System.Web.dll to set it back. Since we're replacing System.Web.dll, we need to perform this fixup manually. 
// For now we'll use 100 * numCPUs. 
int newLimits = 100 * Environment.ProcessorCount; // this is actually # cores (including hyperthreaded cores) 
int existingMaxWorkerThreads; 
int existingMaxIocpThreads; 
ThreadPool.GetMaxThreads(out existingMaxWorkerThreads, out existingMaxIocpThreads); 
ThreadPool.SetMaxThreads(Math.Max(newLimits, existingMaxWorkerThreads), Math.Max(newLimits, existingMaxIocpThreads));

Startup.cs

public Startup()
{
#if DEBUG
    // HACK
    if (System.Diagnostics.Process.GetCurrentProcess().ProcessName == "iisexpress")
    {
        // Set worker threads as Helios sets them too low for IIS Express
        // https://github.com/aspnet/Home/issues/94
        int newLimits = 100 * Environment.ProcessorCount; // this is actually # cores (including hyperthreaded cores) 
        int existingMaxWorkerThreads;
        int existingMaxIocpThreads;
        System.Threading.ThreadPool.GetMaxThreads(out existingMaxWorkerThreads, out existingMaxIocpThreads);
        System.Threading.ThreadPool.SetMaxThreads(Math.Max(newLimits, existingMaxWorkerThreads), Math.Max(newLimits, existingMaxIocpThreads));
    }
#endif
}