Fix Cgo lock os thread failed (#19148) (#19487)

Signed-off-by: Nbigsheeper <yihao.dai@zilliz.com>
Co-authored-by: Nxiaofan-luan <xiaofan.luan@zilliz.com>
Co-authored-by: NXiaofan <83447078+xiaofan-luan@users.noreply.github.com>
Co-authored-by: Nxiaofan-luan <xiaofan.luan@zilliz.com>

internal/querynode/query_node.go

@@ -251,15 +251,20 @@ func (node *QueryNode) Init() error {
 			return
 		}
 
+		// ensure every cgopool go routine is locked with a OS thread
+		// so openmp in knowhere won't create too much request
 		sig := make(chan struct{})
-
+		wg := sync.WaitGroup{}
+		wg.Add(cpuNum)
 		for i := 0; i < cpuNum; i++ {
 			node.cgoPool.Submit(func() (interface{}, error) {
 				runtime.LockOSThread()
+				wg.Done()
 				<-sig
 				return nil, nil
 			})
 		}
+		wg.Wait()
 		close(sig)
 
 		node.metaReplica = newCollectionReplica(node.cgoPool)