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(* Copyright 2012 Ian Hinder
This file is part of Kranc.
Kranc is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
Kranc is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Kranc; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*)
BeginPackage["CaKernel`", {"Errors`", "Helpers`", "Kranc`", "CodeGenCactus`", "CodeGenKranc`", "MapLookup`",
"Calculation`", "CodeGen`", "CodeGenCalculation`", "CodeGenC`"}];
CaKernelCCL;
CaKernelCode;
CaKernelEpilogue;
CaKernelSchedule;
CaKernelConfigurationCLL;
CaKernelInterfaceCLL;
WithHostCalculations;
Begin["`Private`"];
DefFn[
variableBlock[var_, intent_String, cached_] :=
CCLBlockCompact["CCTK_CUDA_KERNEL_VARIABLE", "", {"cached" -> If[cached,"yes","no"], "intent" -> intent}, {var}, ToString[var]]];
DefFn[
parameterBlock[par_] :=
CCLBlock["CCTK_CUDA_KERNEL_PARAMETER", "", {}, {par,"\n"}, ToString[par]]];
DefFn[
variableBlocks[calc_] :=
Module[
{in,out,all,inOnly,outOnly,inOut,params, cachedVars},
params = GetCalculationParameters[calc];
in = Join[InputGridFunctions[calc]];
out = OutputGridFunctions[calc];
all = Union[in,out];
inOnly = Join[Complement[in, out]];
outOnly = Complement[out, in];
inOut = Intersection[in,out];
cachedVars = lookupDefault[calc, CachedVariables, {}];
Riffle[
Map[variableBlock[#, Which[MemberQ[inOnly, #], "in",
MemberQ[outOnly, #], "out",
MemberQ[inOut, #], "inout",
True,ThrowError["Unable to determine use of variable "<>ToString[#]]],
MemberQ[cachedVars,#]] &, all]~Join~
Map[parameterBlock, params],
""]]];
DefFn[
kernelCCLBlock[calc_, tileSize_List] :=
Module[
{bnd = BoundaryCalculationQ[calc],
int, attrs},
int = !bnd;
attrs = {"TYPE" -> If[int, "gpu_cuda/3dblock", "gpu_cuda/boundary_s"],
"TILE" -> Quote[StringJoin[Riffle[ToString/@tileSize,","]]],
"SHARECODE" -> "yes"};
If[int,
attrs = Append[attrs,
"STENCIL" ->
Quote@FlattenBlock@Riffle[
Flatten[Map[{#,#} &,
CalculationStencilSize[calc]],1],","]]];
CCLBlock["CCTK_CUDA_KERNEL", lookup[calc, Name], attrs,
variableBlocks[calc]]]];
Options[CaKernelCCL] = ThornOptions;
DefFn[CaKernelCCL[calcs_List, opts:OptionsPattern[]] :=
Module[
{},
Map[kernelCCLBlock[#,OptionValue[TileSize]] &, Select[calcs, CalculationOnDevice]]]];
DefFn[CaKernelSchedule[thornName_] :=
{
{
Name -> thornName <> "_Init",
SchedulePoint -> "in CCTK_BASEGRID after Accelerator_SetDevice",
Language -> "C",
Options -> "local",
Comment -> "Initialize CUDA Device"
}
}]
CaKernelConfigurationCLL[] :=
"REQUIRES CUDA MPI\n";
CaKernelInterfaceCLL[] :=
"
# These functions are provided by the CaKernel thorn
CCTK_INT FUNCTION Device_RegisterMem(CCTK_POINTER IN cctkGH, CCTK_INT IN vi, CCTK_INT IN num_tls)
REQUIRES FUNCTION Device_RegisterMem
CCTK_INT FUNCTION Device_UnRegisterMem(CCTK_POINTER IN cctkGH, CCTK_INT IN vi)
REQUIRES FUNCTION Device_UnRegisterMem
CCTK_POINTER FUNCTION Device_GetVarI (CCTK_POINTER IN cctkGH, CCTK_INT IN vi, CCTK_INT IN num_tls)
REQUIRES FUNCTION Device_GetVarI
";
DefFn[codeBlock[macro_String, contents_] :=
Module[
{},
CheckBlock[contents];
{macro<>"_Begin", "\n",
IndentBlock[{contents,"\n"}],
macro<>"_End","\n"}]];
DefFn[
CaKernelInitialiseFDVariables[] :=
CommentedBlock[
"Initialise finite differencing variables",
{
DeclareAssignVariable[DataType[], "dx", "params.cagh_dx"],
DeclareAssignVariable[DataType[], "dy", "params.cagh_dy"],
DeclareAssignVariable[DataType[], "dz", "params.cagh_dz"],
DeclareAssignVariable[DataType[], "dt", "params.cagh_dt"],
DeclareAssignVariable[DataType[], "t", "params.cagh_time"],
DeclareAssignVariable[DataType[], "dxi", "INV(dx)"],
DeclareAssignVariable[DataType[], "dyi", "INV(dy)"],
DeclareAssignVariable[DataType[], "dzi", "INV(dz)"],
DeclareAssignVariable[DataType[], "khalf", "0.5"],
DeclareAssignVariable[DataType[], "kthird", "1/3.0"],
DeclareAssignVariable[DataType[], "ktwothird", "2.0/3.0"],
DeclareAssignVariable[DataType[], "kfourthird", "4.0/3.0"],
DeclareAssignVariable[DataType[], "keightthird", "8.0/3.0"],
DeclareAssignVariable[DataType[], "hdxi", "0.5 * dxi"],
DeclareAssignVariable[DataType[], "hdyi", "0.5 * dyi"],
DeclareAssignVariable[DataType[], "hdzi", "0.5 * dzi"]}]];
cakernelLoopFunctionInt[b_, opts___] :=
codeBlock[LoopName /. {opts}, b];
cakernelLoopFunctionBnd[b_, opts___] :=
b;
DefFn[CaKernelCode[calc_List,opts___] :=
Module[
{kernel = "CAKERNEL_"<>GetCalculationName[calc], calc2,
compSuff, int, loopFunction},
SetDataType["CCTK_REAL"];
int = !BoundaryCalculationQ[calc];
loopFunction = If[int, cakernelLoopFunctionInt, cakernelLoopFunctionBnd];
calc2 = Join[calc, {BodyFunction -> (codeBlock[kernel, #] &),
CallerFunction -> False,
LoopFunction -> loopFunction,
GFAccessFunction -> ({"I3D(",Riffle[{#,0,0,0},","],")"} &),
InitFDVariables -> CaKernelInitialiseFDVariables[],
MacroPointer -> False}];
If[!int,
calc2 = calc2 /. {normal1 -> "bound_x", normal2 -> "bound_y", normal3 -> "bound_z"}];
{"#undef KRANC_DIFF_FUNCTIONS\n",
"#define KRANC_" <> ToUpperCase[CodeGenC`SOURCELANGUAGE] <> "\n",
Map[IncludeFile, {"Differencing.h", "GenericFD.h"}],
"\n",
"#undef KRANC_GFOFFSET3D\n",
"#define KRANC_GFOFFSET3D(u,i,j,k) I3D(u,i,j,k)\n",
"\n",
CalculationMacros[],
"\n", CreateCalculationFunction[calc2, LoopName -> kernel<>"_Computations",
opts]}]];
DefFn[
splitHostCaKernel[calc_List] :=
(* Each calculation is marked as ExecuteOn Host, Device or
Automatic. The default is Automatic. Only calculations
specified as Host are the special ones. These ones will ALWAYS
execute on the host. Otherwise, they will execute on the
device for a CaKernel run, and the host for a host run.
Any calculation which is scheduled to execute on the host
should be left alone. We don't need to modify it. Any
calculation which has ExecuteOn -> Automatic should be split
into two. One will be a host calculation and one a CaKernel
one. Which is scheduled will depend on the global variable.
*)
If[lookup[calc,ExecuteOn,Automatic] === Host,
{calc},
Module[
{deviceCalc, hostCalc, newCalcs},
deviceCalc =
mapReplaceAdd[
mapReplaceAdd[
mapReplace[
calc,
Name,"DEVICE_"<>lookup[calc,Name]],
UseCaKernel, True],
ExecuteOn, Device];
hostCalc =
mapReplaceAdd[
mapReplaceAdd[
mapReplace[
calc,
Name,"HOST_"<>lookup[calc,Name]],
UseCaKernel,False],
ExecuteOn, Host];
newCalcs = Map[InNewScheduleGroup[lookup[calc,Name],#] &, {hostCalc, deviceCalc}];
(* Apply the conditional to the routines, not to the group *)
newCalcs = MapThread[AddConditionSuffix,
{newCalcs,
{"Accelerator::host_process",
"Accelerator::device_process"}}];
newCalcs]]];
DefFn[
WithHostCalculations[calcs_List] :=
Flatten[Map[splitHostCaKernel, calcs],1]];
End[];
EndPackage[];
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