dbcsr_mm_accdrv_init Subroutine

   SUBROUTINE dbcsr_mm_accdrv_init(this, product_wm, nlayers, keep_product_data)
      !! Initializes a multiplication cycle for new set of C-blocks.
      TYPE(dbcsr_mm_accdrv_type), INTENT(INOUT)          :: this
      TYPE(dbcsr_work_type), POINTER                     :: product_wm
      INTEGER, OPTIONAL                                  :: nlayers
      LOGICAL, INTENT(IN)                                :: keep_product_data

      CHARACTER(len=*), PARAMETER :: routineN = 'dbcsr_mm_accdrv_init'

      INTEGER                                            :: handle, ithread, my_nlayers
      TYPE(dbcsr_data_obj)                               :: c_area
      TYPE(thread_private_type), POINTER                 :: thread_privates

      CALL timeset(routineN, handle)

      ithread = 0
!$    ithread = OMP_GET_THREAD_NUM()
      thread_privates => all_thread_privates(ithread)

      ! Setup global data which is reused in between multiplications
      !------------------------------------------------------------------------
      CALL setup_streams()
      CALL setup_stackbuffers()

      !Each thread has its own memtype with its own mempool
      CALL dbcsr_memtype_setup(thread_privates%memtype_cbuffer, has_pool=.TRUE., acc_hostalloc=.TRUE., &
                               acc_devalloc=.TRUE., acc_stream=thread_streams(ithread + 1))
      my_nlayers = 1
      IF (PRESENT(nlayers)) my_nlayers = nlayers
      this%nlayers = my_nlayers
      CALL dbcsr_mempool_limit_capacity(thread_privates%memtype_cbuffer%pool, capacity=my_nlayers)

      ! Setup things for this particular multiplication
      !------------------------------------------------------------------------
      this%keep_product_data = keep_product_data
      this%do_gpu_c_redux = .FALSE.
      this%product_wm => product_wm
      c_area = this%product_wm%data_area

      CALL dbcsr_data_new(this%c_buffer, data_type=dbcsr_data_get_type(c_area), &
                          data_size=dbcsr_data_get_size(c_area), memory_type=thread_privates%memtype_cbuffer)

      CALL acc_devmem_setzero_bytes(this%c_buffer%d%acc_devmem, &
                                    stream=this%c_buffer%d%memory_type%acc_stream)

      CALL acc_event_record(this%c_buffer%d%acc_ready, &
                            stream=this%c_buffer%d%memory_type%acc_stream)

      CALL timestop(handle)
   END SUBROUTINE dbcsr_mm_accdrv_init