add ability to limit concurrency (#565)

effective concurrency in zenserver can be limited via the `--corelimit=<N>` option on the command line. Any value passed in here will be used instead of the return value from `std::thread::hardware_concurrency()` if it is lower.

* added --corelimit option to zenserver
* made sure thread pools are configured lazily and not during global init
* added log output indicating effective and HW concurrency
* added change log entry
* removed debug logging from ZenEntryPoint::Run()

also removed main thread naming on Linux since it makes the output from `top` and similar tools confusing (it shows `main` instead of `zenserver`)

1 files changed, 2 insertions, 3 deletions

diff --git a/src/zenremotestore/projectstore/remoteprojectstore.cpp b/src/zenremotestore/projectstore/remoteprojectstore.cpp
index 0d1e0d93d..727a25ba1 100644
--- a/src/zenremotestore/projectstore/remoteprojectstore.cpp
+++ b/src/zenremotestore/projectstore/remoteprojectstore.cpp
@@ -3452,9 +3452,8 @@ TEST_CASE_TEMPLATE("project.store.export",
 	std::shared_ptr<RemoteProjectStore> RemoteStore = CreateFileRemoteStore(Options);
 	RemoteProjectStore::RemoteStoreInfo StoreInfo	= RemoteStore->GetInfo();
 
-	uint32_t NetworkWorkerCount = Max(std::thread::hardware_concurrency() / 4u, 2u);
-	uint32_t WorkerCount =
-		(NetworkWorkerCount < std::thread::hardware_concurrency()) ? Max(std::thread::hardware_concurrency() - NetworkWorkerCount, 4u) : 4u;
+	uint32_t NetworkWorkerCount = Max(GetHardwareConcurrency() / 4u, 2u);
+	uint32_t WorkerCount = (NetworkWorkerCount < GetHardwareConcurrency()) ? Max(GetHardwareConcurrency() - NetworkWorkerCount, 4u) : 4u;
 
 	WorkerThreadPool WorkerPool(WorkerCount);
 	WorkerThreadPool NetworkPool(NetworkWorkerCount);