@Override
public void copyToHost(int offset, int length) {
DevicePointerInfo devicePointerInfo =
pointersToContexts.get(Thread.currentThread().getName(), new Pair<>(offset, length));
if (devicePointerInfo == null)
throw new IllegalStateException("No pointer found for offset " + offset);
// prevent inconsistent pointers
if (devicePointerInfo.getOffset() != offset)
throw new IllegalStateException(
"Device pointer offset didn't match specified offset in pointer map");
if (devicePointerInfo != null) {
ContextHolder.syncStream();
int deviceStride = devicePointerInfo.getStride();
int deviceOffset = devicePointerInfo.getOffset();
long deviceLength = devicePointerInfo.getLength();
if (deviceOffset == 0 && length < length()) {
/**
* The way the data works out the stride for retrieving the data should be 1.
*
* <p>The device stride should be used for resetting the data.
*
* <p>This is for the edge case where the offset is zero and the length of the pointer is <
* the actual buffer length itself.
*/
JCublas2.cublasGetVectorAsync(
length,
getElementSize(),
devicePointerInfo.getPointer().withByteOffset(offset * getElementSize()),
deviceStride,
getHostPointer(deviceOffset),
deviceStride,
ContextHolder.getInstance().getCudaStream());
} else {
JCublas2.cublasGetVectorAsync(
(int) deviceLength,
getElementSize(),
devicePointerInfo.getPointer().withByteOffset(offset * getElementSize()),
deviceStride,
getHostPointer(deviceOffset),
deviceStride,
ContextHolder.getInstance().getCudaStream());
}
ContextHolder.syncStream();
} else throw new IllegalStateException("No offset found to copy");
}
/**
* Set an individual element
*
* @param index the index of the element
* @param from the element to get data from
*/
protected void set(int index, int length, Pointer from, int inc) {
modified.set(true);
int offset = getElementSize() * index;
if (offset >= length() * getElementSize())
throw new IllegalArgumentException(
"Illegal offset " + offset + " with index of " + index + " and length " + length());
JCublas2.cublasSetVectorAsync(
length,
getElementSize(),
from,
inc,
getHostPointer().withByteOffset(offset),
1,
ContextHolder.getInstance().getCudaStream());
ContextHolder.syncStream();
}
