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27.4.4.23 The ps_trace_thread() Procedure

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Dumps all Performance Schema data for an instrumented thread to a .dot formatted graph file (for the DOT graph description language). Each result set returned from the procedure should be used for a complete graph.

This procedure disables binary logging during its execution by manipulating the session value of the sql_log_bin system variable. That is a restricted operation, so the procedure requires privileges sufficient to set restricted session variables. See Section 5.1.9.1, “System Variable Privileges”.

Parameters

  • in_thread_id INT: The thread to trace.

  • in_outfile VARCHAR(255): The name to use for the .dot output file.

  • in_max_runtime DECIMAL(20,2): The maximum number of seconds (which can be fractional) to collect data. Use NULL to collect data for the default of 60 seconds.

  • in_interval DECIMAL(20,2): The number of seconds (which can be fractional) to sleep between data collections. Use NULL to sleep for the default of 1 second.

  • in_start_fresh BOOLEAN: Whether to reset all Performance Schema data before tracing.

  • in_auto_setup BOOLEAN: Whether to disable all other threads and enable all instruments and consumers. This also resets the settings at the end of the run.

  • in_debug BOOLEAN: Whether to include file:lineno information in the graph.

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Example
  1. mysql> CALL sys.ps_trace_thread(25, CONCAT('/tmp/stack-', REPLACE(NOW(), ' ', '-'), '.dot'), NULL, NULL, TRUE, TRUE, TRUE);
  2. +-------------------+
  3. | summary           |
  4. +-------------------+
  5. | Disabled 1 thread |
  6. +-------------------+
  7. 1 row in set (0.00 sec)
  8.  
  9. +---------------------------------------------+
  10. | Info                                        |
  11. +---------------------------------------------+
  12. | Data collection starting for THREAD_ID = 25 |
  13. +---------------------------------------------+
  14. 1 row in set (0.03 sec)
  15.  
  16. +-----------------------------------------------------------+
  17. | Info                                                      |
  18. +-----------------------------------------------------------+
  19. | Stack trace written to /tmp/stack-2014-02-16-21:18:41.dot |
  20. +-----------------------------------------------------------+
  21. 1 row in set (60.07 sec)
  22.  
  23. +-------------------------------------------------------------------+
  24. | Convert to PDF                                                    |
  25. +-------------------------------------------------------------------+
  26. | dot -Tpdf -o /tmp/stack_25.pdf /tmp/stack-2014-02-16-21:18:41.dot |
  27. +-------------------------------------------------------------------+
  28. 1 row in set (60.07 sec)
  29.  
  30. +-------------------------------------------------------------------+
  31. | Convert to PNG                                                    |
  32. +-------------------------------------------------------------------+
  33. | dot -Tpng -o /tmp/stack_25.png /tmp/stack-2014-02-16-21:18:41.dot |
  34. +-------------------------------------------------------------------+
  35. 1 row in set (60.07 sec)
  36.  
  37. +------------------+
  38. | summary          |
  39. +------------------+
  40. | Enabled 1 thread |
  41. +------------------+
  42. 1 row in set (60.32 sec)

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Document created the 26/06/2006, last modified the 26/10/2018
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References

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