运行速度问题

lib/tasks/statistic_subject_info.rake

@@ -122,7 +122,9 @@ namespace :subjects do
     buffer_size = 0
     column_value = "user_id, subject_id, username, passed_myshixun_count, passed_games_count, " +
         "code_line_count, evaluate_count, cost_time, created_at, updated_at"
-    subjects.find_each(batch_size: 50) do |subject|
+
+    subjects.find_in_batches(batch_size: 50) do |s|
+      Parallel.each(s, in_processes: 10) do |subject|
         puts("---------------------user_info_statistic: #{subject.id}")
         data = Subjects::UserUsedInfoService.call(subject)
         Parallel.each(data, in_processes: 10) do |key|
@@ -140,6 +142,7 @@ namespace :subjects do
           end
         end
       end
+    end
     if buffer_size > 0
       sql = "REPLACE INTO subject_user_infos(#{column_value}) VALUES #{str}"
       puts sql