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Distributed trace data acquisition system

  • US 5,642,478 A
  • Filed: 12/29/1994
  • Issued: 06/24/1997
  • Est. Priority Date: 12/29/1994
  • Status: Expired due to Fees
First Claim
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1. In a distributed digital system of coupled nodes each for performing at least one digital processing function and each including a node processor, a node memory and one or more node controllers for exchanging messages with other nodes or devices, a distributed trace data acquisition system comprising:

  • a plurality of capture circuits each disposed in a corresponding one of said coupled nodes for capturing event data therefor;

    a plurality of trace data buffers in each said node memory associated with one of said capture circuits each for storing one or more trace data entries for one or more of a plurality of trace formats, wherein each said trace data entry includes one or more linked data blocks each having a header data field and a trace data segment; and

    timestamp means in each said capture circuit for producing a timestamp for storage in said header field of each said linked data block;

    wherein said plurality of trace formats comprises;

    a trace format for node processor instruction level tracing;

    a trace format for software level tracing; and

    a trace format for internode message level tracing.

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