Package ai.rapids.cudf.nvcomp

Class BatchedDecompressor

java.lang.Object

ai.rapids.cudf.nvcomp.BatchedDecompressor

Direct Known Subclasses:

BatchedLZ4Decompressor, BatchedZstdDecompressor

public abstract class BatchedDecompressor
extends Object

Decompressor that operates on multiple input buffers in a batch

Constructor Summary

Constructors

Constructor	Description
BatchedDecompressor(long chunkSize)	Construct a batched decompressor instance

Method Summary

Modifier and Type	Method	Description
protected abstract void	batchedDecompressAsync(long devInPtrs, long devInSizes, long devOutSizes, long batchSize, long tempPtr, long tempSize, long devOutPtrs, long stream)	Asynchronously decompress a batch of compressed data buffers.
protected abstract long	batchedDecompressGetTempSize(long numChunks, long maxUncompressedChunkBytes)	Computes the temporary storage size in bytes needed to decompress a compressed batch.
void	decompressAsync(BaseDeviceMemoryBuffer[] origInputs, BaseDeviceMemoryBuffer[] outputs, Cuda.Stream stream)	Asynchronously decompress a batch of buffers

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

BatchedDecompressor

public BatchedDecompressor(long chunkSize)

Construct a batched decompressor instance

Parameters:

chunkSize - maximum uncompressed block size, must match value used during compression

Method Details

decompressAsync

public void decompressAsync(BaseDeviceMemoryBuffer[] origInputs,
 BaseDeviceMemoryBuffer[] outputs,
 Cuda.Stream stream)

Asynchronously decompress a batch of buffers

Parameters:

origInputs - buffers to decompress, will be closed by this operation

outputs - output buffers that will contain the decompressed results, each must be sized to the exact decompressed size of the corresponding input

stream - CUDA stream to use

batchedDecompressGetTempSize

protected abstract long batchedDecompressGetTempSize(long numChunks,
 long maxUncompressedChunkBytes)

Computes the temporary storage size in bytes needed to decompress a compressed batch.

Parameters:

numChunks - number of chunks in the batch

maxUncompressedChunkBytes - maximum uncompressed size of any chunk in bytes

Returns:

number of temporary storage bytes needed to decompress the batch

batchedDecompressAsync

protected abstract void batchedDecompressAsync(long devInPtrs,
 long devInSizes,
 long devOutSizes,
 long batchSize,
 long tempPtr,
 long tempSize,
 long devOutPtrs,
 long stream)

Asynchronously decompress a batch of compressed data buffers.

Parameters:

devInPtrs - device address of compressed input buffer addresses vector

devInSizes - device address of compressed input buffer sizes vector

devOutSizes - device address of uncompressed buffer sizes vector

batchSize - number of buffers in the batch

tempPtr - device address of the temporary decompression space

tempSize - size of the temporary decompression space in bytes

devOutPtrs - device address of uncompressed output buffer addresses vector

stream - CUDA stream to use