Comments (3)
endocrimes
commented on August 27, 2024
1
@vzsg Thanks for doing that! - I'll try and make some time for profiling this soon.
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czechboy0
commented on August 27, 2024
There are performance tests in the test suite, so you could try to run those on the other parsers and compare? Let me know if you do! (I'm curious as well)
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vzsg
commented on August 27, 2024
I had some free time (and some insomnia), so I played around Jay and two readily available alternatives: JSONSerialization and PerfectLib. OP's other libraries are pure C with very different semantics, for which I lack both the patience and the experience to wrap for Swift.
Using sample data from here, and the benchmark classes from here, I hacked together a benchmark that loops through the parsers and the input files, parses the data 200 times, and measures the time taken by the actual JSON parsing.
Environment:
- 2015 MBP (Core i5 2.7GHz, 8 GB RAM, power adapter)
- macOS 10.12.3 Beta (16D12b)
- Swift 3.0.2 (built in release mode, default optimization settings)
Results:
| Source file (size) | Library | Average time | RSD |
|---|---|---|---|
| actionLabel.json (872) | JSONSerialization | 0.088701ms | 35.2% |
| Jay | 0.27735ms | 42.6% | |
| PerfectLib | 0.192724ms | 56.7% | |
| citm_catalog.json (1727204) | JSONSerialization | 10.5ms | 13.0% |
| Jay | 195.0ms | 1.7% | |
| PerfectLib | 134.4ms | 1.9% | |
| medium.json (2202) | JSONSerialization | 0.110465ms | 26.9% |
| Jay | 0.516045ms | 32.2% | |
| PerfectLib | 0.382738ms | 37.7% | |
| menu.json (276) | JSONSerialization | 0.082635ms | 119.9% |
| Jay | 0.109255ms | 24.4% | |
| PerfectLib | 0.086137ms | 107.8% | |
| sgml.json (705) | JSONSerialization | 0.078692ms | 30.1% |
| Jay | 0.178616ms | 25.3% | |
| PerfectLib | 0.135693ms | 90.1% | |
| small.json (42) | JSONSerialization | 0.077599ms | 29.9% |
| Jay | 0.050222ms | 25.5% | |
| PerfectLib | 0.0388ms | 30.7% | |
| webxml.json (4054) | JSONSerialization | 0.145353ms | 26.1% |
| Jay | 1.006042ms | 33.1% | |
| PerfectLib | 0.755938ms | 34.0% | |
| widget.json (761) | JSONSerialization | 0.114966ms | 40.3% |
| Jay | 0.279561ms | 24.0% | |
| PerfectLib | 0.189957ms | 25.9% |
Takeaway:
There seems to be something very weird going on while parsing citm_catalog.json (~1,7 MBs) with both Swift libraries. That slow down is huge.
from jay.
Related Issues (20)
- Offer API to expose source maps of parsed JSON documents HOT 4
- Add unwrapping convenience functions HOT 1
- Add header documentation
- CocoaPods HOT 2
- Swift 3?
- Add support for JSON comments HOT 1
- Also escape other whitespace control characters
- Also conform to RFC7159 HOT 4
- Incorrect String->Int map detection HOT 8
- UTF-16 unsupported HOT 4
- Offer a String API HOT 7
- Cannot parse JSON with integer values bigger than Int.max HOT 1
- dataFromJson() Int 0,1 exchange Bool
- Incorrect parsing of Double values if the fraction part starts with zeroes
- Add JSON text visual formatting options
- Tagging a new version HOT 2
- Can't parse exponents that starts with zero
- Purpose of Jay struct HOT 2
- Investigate better way to detect/validate passed-in JSON object
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