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Apparatus for compressing and buffering data

  • US 4,574,351 A
  • Filed: 03/03/1983
  • Issued: 03/04/1986
  • Est. Priority Date: 03/03/1983
  • Status: Expired due to Fees
First Claim
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1. Apparatus for compressing and buffering large amounts of data collected in real time from a computer system having a central processing unit (CPU), control means having an output for starting and stopping said CPU, virtual storage addressed by virtual storage addresses and real storage addressed by real storage addresses formed by converting the virtual addresses to real storage addresses, the improvement comprising;

  • means for converting said real storage addresses to virtual storage addresses where said virtual storage addresses include a segment identifier and an offset;

    compression menas for compressing said virtual storage addresses formed by converting said real storage addresses, said compression means including means for adding leading bits to said offset to distinguish said offset from said segment identifier, means for adding other bits to said offset to relate said offset to a segment identifier and means for temporarily storing only unique segment identifiers of said virtual storage addresses formed by converting said real addresses and for temporarily storing all offsets including said added bits;

    buffer means coupled to the compression means for storing said segment identifiers and said offsets temporarily stored by said compression means;

    monitoring means for monitoring said buffer means and providing a stop CPU signal to said control means upon said buffer means having a predetermined amount of data; and

    emptying means coupled to the monitoring means for emptying said buffer means to a collection device after it has been filled with said predetermined amount of data and for providing a start CPU signal to said control means after said buffer has been emptied.

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