adjust resource usage for dedicated servers (#466)

when dedicated mode is enabled via `--dedicated` or `server.dedicated` then we tune http.sys server settings to be more suitable for a shared server

initially we tune two things

* the thread pool used to service I/O requests allows a larger number of threads to be created when needed. The minimum thread count is unchanged but in dedicated server mode we double the maximum number of threads allowed
* the http.sys request queue length (`HttpServerQueueLengthProperty`) is increased to 50,000 in dedicated mode. The regular default is 1,000

1 files changed, 8 insertions, 3 deletions

diff --git a/src/zenhttp/iothreadpool.cpp b/src/zenhttp/iothreadpool.cpp
index 6087e69ec..da4b42e28 100644
--- a/src/zenhttp/iothreadpool.cpp
+++ b/src/zenhttp/iothreadpool.cpp
@@ -8,14 +8,19 @@
 
 namespace zen {
 
-WinIoThreadPool::WinIoThreadPool(int InThreadCount)
+WinIoThreadPool::WinIoThreadPool(int InThreadCount, int InMaxThreadCount)
 {
-	// Thread pool setup
+	ZEN_ASSERT(InThreadCount);
+
+	if (InMaxThreadCount < InThreadCount)
+	{
+		InMaxThreadCount = InThreadCount;
+	}
 
 	m_ThreadPool = CreateThreadpool(NULL);
 
 	SetThreadpoolThreadMinimum(m_ThreadPool, InThreadCount);
-	SetThreadpoolThreadMaximum(m_ThreadPool, InThreadCount * 2);
+	SetThreadpoolThreadMaximum(m_ThreadPool, InMaxThreadCount);
 
 	InitializeThreadpoolEnvironment(&m_CallbackEnvironment);