--script 1
select top 10
t1.session_id, 
t1.request_id, 
t1.task_alloc,
     t1.task_dealloc,  
    (SELECT SUBSTRING(text, t2.statement_start_offset/2 + 1,
          (CASE WHEN statement_end_offset = -1 
              THEN LEN(CONVERT(nvarchar(max),text)) * 2 
                   ELSE statement_end_offset 
              END - t2.statement_start_offset)/2)
     FROM sys.dm_exec_sql_text(sql_handle)) AS query_text,
(SELECT query_plan from sys.dm_exec_query_plan(t2.plan_handle)) as query_plan


from      (Select session_id, request_id,
sum(internal_objects_alloc_page_count +   user_objects_alloc_page_count) as task_alloc,
sum (internal_objects_dealloc_page_count + user_objects_dealloc_page_count) as task_dealloc
       from sys.dm_db_task_space_usage 
       group by session_id, request_id) as t1, 
       sys.dm_exec_requests as t2
where t1.session_id = t2.session_id and 
(t1.request_id = t2.request_id) and 
      t1.session_id > 50
order by t1.task_alloc DESC

--script 2
select ES.session_id
, ES.login_time
, DB_NAME(SU.database_id)
, ES.host_name 
, user_objects_alloc_page_count
, user_objects_dealloc_page_count
, internal_objects_alloc_page_count
, internal_objects_alloc_page_count
from sys.dm_db_session_space_usage SU     
inner join sys.dm_exec_sessions ES
on SU.session_id = ES.session_id
where DB_NAME(database_id) = 'tempdb'
and ES.is_user_process <> 0