运行速度问题

lib/tasks/statistic_subject_info.rake

@@ -122,21 +122,24 @@ 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|
-      puts("---------------------user_info_statistic: #{subject.id}")
-      data = Subjects::UserUsedInfoService.call(subject)
-      Parallel.each(data, in_processes: 10) do |key|
-        next if key[:user_id].nil?
-        str += ", " unless str.empty?
-        str += ("(#{key[:user_id]}, #{subject.id}, '#{key[:name].gsub(/'/, '"')}', #{key[:passed_myshixun_count]}, " +
-            "#{key[:passed_games_count]}, #{key[:code_line_count]}, #{key[:evaluate_count]}, #{key[:cost_time]}, " +
-            "'#{Time.now.strftime('%Y-%m-%d %H:%M:%S')}', '#{Time.now.strftime('%Y-%m-%d %H:%M:%S')}')")
-        buffer_size += 1
-        if buffer_size == 1000
-          sql = "REPLACE INTO subject_user_infos(#{column_value}) VALUES #{str}"
-          ActiveRecord::Base.connection.execute sql
-          str = ""
-          buffer_size = 0
+
+    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|
+          next if key[:user_id].nil?
+          str += ", " unless str.empty?
+          str += ("(#{key[:user_id]}, #{subject.id}, '#{key[:name].gsub(/'/, '"')}', #{key[:passed_myshixun_count]}, " +
+              "#{key[:passed_games_count]}, #{key[:code_line_count]}, #{key[:evaluate_count]}, #{key[:cost_time]}, " +
+              "'#{Time.now.strftime('%Y-%m-%d %H:%M:%S')}', '#{Time.now.strftime('%Y-%m-%d %H:%M:%S')}')")
+          buffer_size += 1
+          if buffer_size == 1000
+            sql = "REPLACE INTO subject_user_infos(#{column_value}) VALUES #{str}"
+            ActiveRecord::Base.connection.execute sql
+            str = ""
+            buffer_size = 0
+          end
         end
       end
     end