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look at that subtle difference in Product.h...

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the cacheOptimal is only good for large enough matrices.
When taking a block in a fixed-size (hence small) matrix,
the SizeAtCompileTime is Dynamic hence that's not a good
indicator. This example shows that the good indicator is
MaxSizeAtCompileTime.
Result: +10% speed in echelon.cpp
This commit is contained in:
Benoit Jacob 2008-03-26 09:29:29 +00:00
parent a994e51c96
commit c9b0dcd733
2 changed files with 4 additions and 3 deletions
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3
Eigen/src/Core/Product.h
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@ -91,8 +91,9 @@ struct ei_product_eval_mode
{ {
enum { enum {
SizeAtCompileTime = MatrixBase<Product<Lhs,Rhs,UnrolledDotProduct> >::SizeAtCompileTime, SizeAtCompileTime = MatrixBase<Product<Lhs,Rhs,UnrolledDotProduct> >::SizeAtCompileTime,
MaxSizeAtCompileTime = MatrixBase<Product<Lhs,Rhs,UnrolledDotProduct> >::MaxSizeAtCompileTime,
EvalMode = ( EIGEN_UNROLLED_LOOPS EvalMode = ( EIGEN_UNROLLED_LOOPS
&& SizeAtCompileTime != Dynamic && MaxSizeAtCompileTime != Dynamic
&& SizeAtCompileTime <= EIGEN_UNROLLING_LIMIT) ? UnrolledDotProduct : CacheOptimal, && SizeAtCompileTime <= EIGEN_UNROLLING_LIMIT) ? UnrolledDotProduct : CacheOptimal,
}; };
}; };

4
doc/echelon.cpp
View File

@ -67,8 +67,8 @@ int main(int, char **)
// now m is still a matrix of rank N-1 // now m is still a matrix of rank N-1
cout << "Here's the matrix m:" << endl << m << endl; cout << "Here's the matrix m:" << endl << m << endl;
cout << "Now let's echelon m:" << endl; cout << "Now let's echelon m (repeating many times for benchmarking purposes):" << endl;
echelon(m); for(int i = 0; i < 1000000; i++) echelon(m);
cout << "Now m is:" << endl << m << endl; cout << "Now m is:" << endl << m << endl;
} }