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Method: allocate_wrk< / A >
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< DIV ALIGN = "CENTER" > < BIG CLASS = "LARGE" > < BIG CLASS = "LARGE" > < BIG CLASS = "LARGE" > < code > call p%allocate_wrk(info[, vmold])< / code >
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< BIG CLASS = "LARGE" > < BIG CLASS = "LARGE" > < BIG CLASS = "LARGE" >
Allocate internal work vectors. Each application of the preconditioner
uses a number of work vectors which are allocated internally as
necessary; therefore allocation and deallocation of memory occurs
multiple times during the execution of a Krylov method. In most cases
this strategy is perfectly acceptable, but
on some platforms, most notably GPUs, memory allocation is
a slow operation, and the default behaviour would lead to a
slowdown. This method allows to trade space for time by preallocating
the internal workspace outside of the invocation of a Krylov
method. When using GPUs or other specialized devices, the < code > vmold< / code >
argument is also necessary to ensure the internal work vectors are of
the appropriate dynamic type to exploit the accelerator hardware; when
allocation occurs internally this is taken care of based on the dynamic
type of the < code > x< / code > argument to the < code > apply< / code > method.
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< TD ALIGN = "LEFT" VALIGN = "TOP" WIDTH = 340 > < BIG CLASS = "LARGE" > < BIG CLASS = "LARGE" > < BIG CLASS = "LARGE" > Error code. If no error, 0 is returned. See Section < A HREF = "node34.html#sec:errors" > 8< / A > for details.< / BIG > < / BIG > < / BIG > < / TD >
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< code > vmold< / code > < / BIG > < / BIG > < / BIG > < / TD >
< TD ALIGN = "LEFT" VALIGN = "TOP" WIDTH = 340 > < BIG CLASS = "LARGE" > < BIG CLASS = "LARGE" > < BIG CLASS = "LARGE" > < code > class(psb_< / code > < SPAN CLASS = "textit" > x< / SPAN > < code > _base_vect_type), intent(in), optional< / code > . < / BIG > < / BIG > < / BIG > < / TD >
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< TD ALIGN = "LEFT" VALIGN = "TOP" WIDTH = 340 > < BIG CLASS = "LARGE" > < BIG CLASS = "LARGE" > < BIG CLASS = "LARGE" > The desired dynamic type for internal vector
components; this allows e.g. running on GPUs. < / BIG > < / BIG > < / BIG > < / TD >
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