117
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Ran 24 Mar 2018 09:52PM UTC

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Build # 117

Build Type

push

travis-ci

Committed by

Grauniad

Commit Message

Performance enhancements to the JSON Parser

Various performance enhancements have been made to the parsing of
 JSON objects (although further work is required to handle arrays of
 embedded objects)

  - When handling embedded objects keep a pointer to the current depth.
    This prevents the need to recurse through each layer's JSON object
  - Faster key lookup (avoid use of std::map)
  - New benchmark binaries compare performance against the native
    rapid-json DOM

The Library will now outperform (~25%) the rapidJSON dom for simple objects
(see example_dom), but is still significantly slower (~40%) when there are
several layers of embedded objects (see glossary_dom). The biggest cost
here is our Reset() - but further investigation would be required to
close the gap. It is worth noting that glossary_dom is comprised
entirely of strings, meaning we do not currently gain anything from our
pre-allocated memory (each field must be strcpy'd onto the heap...)

Improving arrays of objects requires further work. The issue is that
each new object added to the array require a new JSON object to be
allocated and initialised. This is crippling for performance.

Run Details

787 of 936 relevant lines covered (84.08%)

86.25 hits per line

Jobs

ID	Job ID	Ran	Files	Coverage
1	117.1	24 Mar 2018 09:52PM UTC	0	84.08	Travis Job 117.1

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