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Added comments on allocat_wrk

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sfilippone
2025-02-21 15:39:43 +01:00
parent 04bcf04a9c
commit be469f8844
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samples/cuda/amg_dexample_cuda.F90
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@@ -1267,6 +1267,16 @@ program amg_dexample_cuda
! solve Ax=b with preconditioned Krylov method ! solve Ax=b with preconditioned Krylov method
call psb_barrier(ctxt) call psb_barrier(ctxt)
!
! Most preconditioners require auxiliary storage. When running
! on the HOST side, allocation/deallocation are usually very cheap
! and can be performed for every invocation of prec%apply.
! However when running on the DEVICE side, such memory management
! operations are global synchronization points, hence very costly.
! Thus the two methods below that preallocate the memory space
! prior to the invocation of the Krylov method, and release memory
! after the method has completed.
!
call prec%allocate_wrk(info,vmold=vmold) call prec%allocate_wrk(info,vmold=vmold)
t1 = psb_wtime() t1 = psb_wtime()