A.39 library(prolog_jiti): Just In Time Indexing (JITI) utilities

To be done

Use print_message/2 and dynamically figure out the column width.

This module provides utilities to examine just-in-time indexes created by the system and can help diagnosing space and performance issues.

[det]jiti_list

[det]jiti_list(:Spec)

List the JITI (Just In Time Indexes) of selected predicates. The predicate jiti_list/0 list all just-in-time indexed predicates. The predicate jiti_list/1 takes one of the patterns below. All parts except for Name can be variables. The last pattern takes an arbitrary number of arguments.

• Module:Head
• Module:Name/Arity
• Module:Name

The columns use the following notation:

• The Indexed column describes the argument(s) indexed:
  • A plain integer refers to a 1-based argument number
  • A+B is a multi-argument index on the arguments A and B.
  • A/B is a deep-index on sub-argument B of argument A.

• The Buckets specifies the number of buckets of the hash table
• The Speedup specifies the selectivity of the index
• The Flags describes additional properties, currently:
  • L denotes that the index contains multiple compound terms with the same name/arity that may be used to create deep indexes. The deep indexes themselves are created as just-in-time indexes.