SUPPORTING RANDOM ACCESS OF COMPRESSED DATA
    1.
    发明申请

    公开(公告)号:US20190391869A1

    公开(公告)日:2019-12-26

    申请号:US16013710

    申请日:2018-06-20

    Abstract: A processing device comprising compression circuitry to: determine a compression configuration to compress source data; generate a checksum of the source data in an uncompressed state; compress the source data into at least one block based on the compression configuration, wherein the at least one block comprises: a plurality of sub-blocks, wherein the plurality of sub-block includes a predetermined size; a block header corresponding to the plurality of sub-blocks; and decompression circuitry coupled to the compression circuitry, wherein the decompression circuitry to: while not outputting a decompressed data stream of the source data: generate index information corresponding to the plurality of sub-blocks; in response to generating the index information, generate a checksum of the compressed source data associated with the plurality of sub-blocks; and determine whether the checksum of the source data in the uncompressed format matches the checksum of the compressed source data.

    TECHNOLOGIES FOR STRUCTURED DATABASE QUERY FOR FINDING UNIQUE ELEMENT VALUES

    公开(公告)号:US20190042611A1

    公开(公告)日:2019-02-07

    申请号:US15868594

    申请日:2018-01-11

    Abstract: Technologies for determining unique values include a computing device that further includes one or more accelerator devices. Each accelerator device is to receive input data and query configuration data, the input data including a packed array of unsigned integers of column data from a database and the query configuration data including an element width of the input data, and generate, in response to receiving the query configuration data, a bit-map output table based on the query configuration data, generate a write request for each element of the input data to set a corresponding bit-map output bit of the bit-map output table which corresponds to an element value of the corresponding element. Subsequently, the accelerator device is further to set the corresponding bit-map output bit to indicate a presence of the corresponding element and output the bit-map output table indicative of unique elements that are present in the input data.

    Optimized selection of hash collision chains

    公开(公告)号:US10528539B2

    公开(公告)日:2020-01-07

    申请号:US15200556

    申请日:2016-07-01

    Abstract: In an example, there is disclosed an apparatus, comprising: a data store comprising a hash table having for at least some rows a hash entry indexed by a hash value, and comprising a hash chain of one or more pointers to a history buffer, and a spill counter; and one or more logic elements, including at least one hardware logic element, comprising a data compressor to: inspect a string0 comprising n bytes at position p in a data file; get the spill counter from a hash entry corresponding to string0; inspect a string1 comprising n bytes at p+k, wherein k is a positive integer; get the spill counter from a hash entry corresponding to string1; determine that the spill counter for string1 is less than the spill counter for string0; and search a chain1 (the hash chain of a hash entry corresponding to string1) for a matching string of size at least n+k with an offset of −k.

    SUPPORTING RANDOM ACCESS OF COMPRESSED DATA
    8.
    发明申请

    公开(公告)号:US20200319959A1

    公开(公告)日:2020-10-08

    申请号:US16908686

    申请日:2020-06-22

    Abstract: A processing device comprising compression circuitry to: determine a compression configuration to compress source data; generate a checksum of the source data in an uncompressed state; compress the source data into at least one block based on the compression configuration, wherein the at least one block comprises: a plurality of sub-blocks, wherein the plurality of sub-block includes a predetermined size; a block header corresponding to the plurality of sub-blocks; and decompression circuitry coupled to the compression circuitry, wherein the decompression circuitry to: while not outputting a decompressed data stream of the source data: generate index information corresponding to the plurality of sub-blocks; in response to generating the index information, generate a checksum of the compressed source data associated with the plurality of sub-blocks; and determine whether the checksum of the source data in the uncompressed format matches the checksum of the compressed source data.

    Supporting random access of compressed data

    公开(公告)号:US10691529B2

    公开(公告)日:2020-06-23

    申请号:US16013710

    申请日:2018-06-20

    Abstract: A processing device comprising compression circuitry to: determine a compression configuration to compress source data; generate a checksum of the source data in an uncompressed state; compress the source data into at least one block based on the compression configuration, wherein the at least one block comprises: a plurality of sub-blocks, wherein the plurality of sub-block includes a predetermined size; a block header corresponding to the plurality of sub-blocks; and decompression circuitry coupled to the compression circuitry, wherein the decompression circuitry to: while not outputting a decompressed data stream of the source data: generate index information corresponding to the plurality of sub-blocks; in response to generating the index information, generate a checksum of the compressed source data associated with the plurality of sub-blocks; and determine whether the checksum of the source data in the uncompressed format matches the checksum of the compressed source data.

    Method and apparatus for high performance compression and decompression

    公开(公告)号:US10270464B1

    公开(公告)日:2019-04-23

    申请号:US15941968

    申请日:2018-03-30

    Abstract: An apparatus and method for performing efficient lossless compression. For example, one embodiment of an apparatus comprises: first compression circuitry to identify and replace one or more repeated bit strings from an input data stream with distances to the one or more repeated bit strings, the first compression circuitry to generate a first compressed data stream comprising literal-length data identifying a first instance of each repeated bit string and distance data comprising distances from the first instance to each repeated instance of the repeated bit string; second compression circuitry to perform sorting, tree generation, and length calculations for literal-length values and distance values of the first compressed data stream, the second compression circuitry comprising: variable length code mapping circuitry to map each literal-length value and distance value to a variable length code; header generation circuitry to generate a header for a final compressed bit stream using the length calculations; and a transcoder to substitute the variable length codes in place of the literal-length and distance values to generate a compressed bit stream body, wherein the transcoder operates in parallel with the header generation circuitry; and bit stream merge circuitry to combine the header with the compressed bit stream body to generate a final lossless compressed bitstream.

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