try smaller batch size

.github/workflows/benchmark.yml

@@ -11,6 +11,19 @@ jobs:
 
     runs-on: ${{ matrix.operating-system }}
 
+    services:
+      postgres:
+        # Docker Hub image
+        image: "postgres:16.1"
+        # Provide the password for postgres
+        env:
+          POSTGRES_PASSWORD: postgres
+          POSTGRES_DB: eventstore
+        options: >-
+          --health-cmd "pg_isready"
+        ports:
+          - "5432:5432"
+
     strategy:
       matrix:
         dependencies:
@@ -20,6 +33,9 @@ jobs:
         operating-system:
           - "ubuntu-latest"
 
+    env:
+      DB_URL: 'pdo-pgsql://postgres:postgres@localhost:5432/eventstore?charset=utf8'
+
     steps:
       - name: "Install PHP"
         uses: "shivammathur/[email protected]"

src/Store/DoctrineDbalStore.php

@@ -145,6 +145,8 @@ function (Connection $connection) use ($messages): void {
                 $batchSize = (int)floor(self::MAX_UNSIGNED_SMALL_INT / $columnsLength);
                 $placeholder = implode(', ', array_fill(0, $columnsLength, '?'));
 
+                $batchSize = 1000;
+
                 $parameters = [];
                 $placeholders = [];
                 /** @var array<int<0, max>, Type> $types */