Overload List
| # | Signature | Description |
|---|---|---|
| 1 | void BlockInit | Initializes block processing. |
| 2 | void BlockInit(TMtxVecInt Src) | Initializes block processing. |
| 3 | void BlockInit(TMtxVecInt Src, Int32 ABlockSize) | Initializes block processing. |
| 4 | void BlockInit(Int32 ABlockSize) | Initializes block processing with specified ABLockSize. |
Overload 1: void BlockInit
Initializes block processing.
Result: stored in self (calling object)
Initializes block processing. Because the size of the CPU cache is limited, significant performance gains can be obtained by splitting long vectors in to a series of short ones, which can all fit in the CPU cache entirely. The BlockInit method is to be used together with Dew.Math.MatrixInt.BlockNext and methods to initialize a block processing while loop. BlockInit will call to obtain subrange of the data in TMtxInt. The Dew.Math.MatrixInt.Length of the subranged vector is determined by the global Dew.Math.Units.Math387.MtxVecBlockSize variable declared in unit. Default value of MtxVecBlockSize is preset to 800 vector elements for double precision and 1600 elements for single precision. BlockInit supports nested calls and from witihin a blocked while loop you can call procedures and functions which are also blocked. If you use block processing, typical performance gains will range from 2 to a maximum of 6. Block processing can not be used, or it is difficult to apply, in cases where vector elements are not independent of each other. The block processing while loop must be written like this:
a.BlockInit;
while !A.BlockEnd do
// .... user defined function
a.BlockNext;Overload 2: void BlockInit(TMtxVecInt Src)
Initializes block processing.
| # | Name | Type | Description |
|---|---|---|---|
| 1 | Src | TMtxVecInt | source TVecInt or TMtxInt |
Result: stored in self (calling object)
Overload 3: void BlockInit(TMtxVecInt Src, Int32 ABlockSize)
Initializes block processing.
| # | Name | Type | Description |
|---|---|---|---|
| 1 | Src | TMtxVecInt | source TVecInt or TMtxInt |
| 2 | ABlockSize | Int32 |
Result: stored in self (calling object)
Block processing can be applied on possibly already subranged Src object. Src may not be freed or go out of scope until block processing loop has finished. There would be no error raised other than AV.
Overload 4: void BlockInit(Int32 ABlockSize)
Initializes block processing with specified ABLockSize.
| # | Name | Type | Description |
|---|---|---|---|
| 1 | ABlockSize | Int32 |
Result: stored in self (calling object)