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cholesky_metal_objc_mps.mm
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cholesky_metal_objc_mps.mm
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#include <memory>
#include <algorithm>
#include <iostream>
#import <MetalPerformanceShaders/MetalPerformanceShaders.h>
#import "cholesky_metal_objc_mps.h"
@implementation CholeskyMetalObjCMPS
{
uint _mDim;
MPSMatrixDecompositionCholesky* _mMPSDecomposer;
id<MTLBuffer> _mMPSMatrixBufferIn;
id<MTLBuffer> _mMPSMatrixBufferOut;
id<MTLBuffer> _mMPSStatus;
MPSMatrix* _mMPSMatrixIn;
MPSMatrix* _mMPSMatrixOut;
MPSMatrixSolveTriangular* _mMPSSolverLyeb;
MPSMatrixSolveTriangular* _mMPSSolverLtxey;
id<MTLBuffer> _mMPSBufferx;
id<MTLBuffer> _mMPSBuffery;
id<MTLBuffer> _mMPSBufferb;
MPSMatrix* _mMPSx;
MPSMatrix* _mMPSy;
MPSMatrix* _mMPSb;
}
- (instancetype) initWithDim:(size_t) dim
{
self = [super init];
if (self)
{
_mDim = dim;
_mMPSDecomposer = [ [ MPSMatrixDecompositionCholesky alloc] initWithDevice: self.device lower:true order: _mDim ];
if (_mMPSDecomposer == nil)
{
NSLog(@"Failed to allocate MPSDecomposer.");
return nil;
}
_mMPSStatus = [ self getSharedMTLBufferForBytes: sizeof(int) for: @"_mMPSStatus" ];
_mMPSMatrixBufferIn = [ self getSharedMTLBufferForBytes: sizeof(float) * _mDim * _mDim for: @"_mMPSMatrixBufferIn" ];
_mMPSMatrixBufferOut = [ self getSharedMTLBufferForBytes: sizeof(float) * _mDim * _mDim for: @"_mMPSMatrixBufferOut" ];
MPSMatrixDescriptor* desc
= [ MPSMatrixDescriptor matrixDescriptorWithRows: _mDim
columns: _mDim
rowBytes: sizeof(float)*_mDim
dataType: MPSDataTypeFloat32 ];
if ( desc == nil)
{
NSLog(@"Failed to allocate MPSMatrixDescriptor");
return nil;
}
_mMPSMatrixIn = [ [ MPSMatrix alloc ] initWithBuffer: _mMPSMatrixBufferIn
descriptor: desc ];
if ( _mMPSMatrixIn == nil )
{
NSLog(@"Failed to allocate _mMPSMatrixIn.");
return nil;
}
_mMPSMatrixOut= [ [ MPSMatrix alloc ] initWithBuffer: _mMPSMatrixBufferOut
descriptor: desc ];
if ( _mMPSMatrixOut == nil )
{
NSLog(@"Failed to allocate _mMPSMatrixOut.");
return nil;
}
_mMPSSolverLyeb = [ [MPSMatrixSolveTriangular alloc]
initWithDevice: self.device
right: false
upper: false
transpose: false
unit: false
order: _mDim
numberOfRightHandSides: 1
alpha: 1.0 ];
if ( _mMPSSolverLyeb == nil )
{
NSLog(@"Failed to allocate _mMPSSolverLyeb.");
return nil;
}
_mMPSSolverLtxey = [ [MPSMatrixSolveTriangular alloc]
initWithDevice: self.device
right: false
upper: false
transpose: true
unit: false
order: _mDim
numberOfRightHandSides: 1
alpha: 1.0 ];
if ( _mMPSSolverLtxey == nil )
{
NSLog(@"Failed to allocate _mMPSSolverLtxey.");
return nil;
}
_mMPSBufferx = [ self getSharedMTLBufferForBytes: sizeof(float) * _mDim for: @"_mMPSBufferx" ];
_mMPSBuffery = [ self getSharedMTLBufferForBytes: sizeof(float) * _mDim for: @"_mMPSBuffery" ];
_mMPSBufferb = [ self getSharedMTLBufferForBytes: sizeof(float) * _mDim for: @"_mMPSBufferb" ];
MPSMatrixDescriptor* desc_vec
= [ MPSMatrixDescriptor matrixDescriptorWithRows: _mDim
columns: 1
rowBytes: sizeof(float)
dataType: MPSDataTypeFloat32 ];
if ( desc_vec == nil)
{
NSLog(@"Failed to allocate MPSMatrixDescriptor for vector");
return nil;
}
_mMPSx = [ [ MPSMatrix alloc ] initWithBuffer:_mMPSBufferx descriptor: desc_vec ];
if ( _mMPSx == nil )
{
NSLog(@"Failed to allocate _mMPSx.");
return nil;
}
_mMPSy = [ [ MPSMatrix alloc ] initWithBuffer:_mMPSBuffery descriptor: desc_vec ];
if ( _mMPSy == nil )
{
NSLog(@"Failed to allocate _mMPSy.");
return nil;
}
_mMPSb = [ [ MPSMatrix alloc ] initWithBuffer:_mMPSBufferb descriptor: desc_vec ];
if ( _mMPSb == nil )
{
NSLog(@"Failed to allocate _mMPSb.");
return nil;
}
}
return self;
}
static inline int lower_mat_index( const int i, const int j, const int dim )
{
const int num_elems = (dim + 1) * dim / 2;
const int i_rev = (dim -1) - i;
const int j_rev = (dim -1) - j;
return num_elems - 1 - ( j_rev * (j_rev + 1) /2 + i_rev );
}
- (void) setInitialStatesL:(float*) L B:(float*) b
{
for ( int i = 0; i < _mDim; i++ ) {
for ( int j = 0 ;j <= i; j++ ) {
((float*)_mMPSMatrixBufferIn.contents)[ i * _mDim + j ] = L[ lower_mat_index( i, j, _mDim ) ];
((float*)_mMPSMatrixBufferIn.contents)[ j * _mDim + i ] = L[ lower_mat_index( i, j, _mDim ) ];
}
}
memcpy( _mMPSBufferb.contents, b, _mDim * sizeof(float) );
}
- (float*) getRawPointerL
{
return (float*)_mMPSMatrixBufferOut.contents;
}
- (float*) getRawPointerX
{
return (float*)_mMPSBufferx.contents;
}
- (float*) getRawPointerY
{
return (float*)_mMPSBuffery.contents;
}
- (float*) getRawPointerB
{
return (float*)_mMPSBufferb.contents;
}
- (void) performComputation
{
id<MTLCommandBuffer> commandBuffer = [ self.commandQueue commandBuffer ];
assert( commandBuffer != nil );
[ _mMPSDecomposer encodeToCommandBuffer: commandBuffer
sourceMatrix: _mMPSMatrixIn
resultMatrix: _mMPSMatrixOut
status: _mMPSStatus ];
[ _mMPSSolverLyeb encodeToCommandBuffer: commandBuffer
sourceMatrix: _mMPSMatrixOut
rightHandSideMatrix: _mMPSb
solutionMatrix: _mMPSy ];
[ _mMPSSolverLtxey encodeToCommandBuffer: commandBuffer
sourceMatrix: _mMPSMatrixOut
rightHandSideMatrix: _mMPSy
solutionMatrix: _mMPSx ];
[commandBuffer commit];
[commandBuffer waitUntilCompleted];
MPSMatrixDecompositionStatus status;
status = (MPSMatrixDecompositionStatus)((int*)_mMPSStatus.contents)[0];
if ( status != MPSMatrixDecompositionStatusSuccess ) {
std::cerr << "Error: MPSStatus: " << status << "\n";
}
}
@end