diff --git a/config/optimizer.yaml b/config/optimizer.yaml
index 6a11cebd6..ad3621c1d 100644
--- a/config/optimizer.yaml
+++ b/config/optimizer.yaml
@@ -3,7 +3,11 @@
 #   go run ./cmd/bbgo optimize --config bollmaker_ethusdt.yaml  --optimizer-config optimizer.yaml --debug
 #
 ---
-maxThread: 10
+executor:
+  type: local
+  local:
+    maxNumberOfProcesses: 10
+
 matrix:
 - type: iterate
   path: '/exchangeStrategies/0/bollmaker/interval'
diff --git a/config/pivotshort_optimizer.yaml b/config/pivotshort_optimizer.yaml
index 16c56aa7e..c32708826 100644
--- a/config/pivotshort_optimizer.yaml
+++ b/config/pivotshort_optimizer.yaml
@@ -3,7 +3,11 @@
 #   go run ./cmd/bbgo optimize --config config/pivotshort-ETHUSDT.yaml  --optimizer-config config/pivotshort_optimizer.yaml --debug
 #
 ---
-maxThread: 10
+executor:
+  type: local
+  local:
+    maxNumberOfProcesses: 10
+
 matrix:
 
 - type: iterate