[Issue 18600] Regex performance enhancement for repeated matchFirst calls

[d-bugmail--- via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=18600

--- Comment #2 from Jon Degenhardt  ---
Phobos PR 6268 was included in LDC 1.10.0-beta1. For this release the standard
benchmark I used for the TSV Utilities improved as follows:

LDC 1.7.0 (before regression): 8.37 seconds
LDC 1.8.0 (after regression): 10.01 seconds
LDC 1.9.0 (first fixes):   9.44 seconds
LDC 1.10.0-beta1 (Phobos PR 6268):  5.85 seconds

First fixes: Phobos PR 5981, DMD PR 7599

The benchmark test used reads a TSV file line-by-line and checks individual
fields for regex matches. A significant amount of processing time is IO, so the
percentage gain on the regex portion is higher than the overall gain. The
overall gain from LDC 1.7.0 is 30%.

Test was run on MacOS, MacMini with 16GB RAM, SSD drives. The file used was
2.7GB, 14 million lines. Test info can be found here:
https://github.com/eBay/tsv-utils-dlang/blob/master/docs/ComparativeBenchmarks2018.md

Great result!

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[Issue 18600] Regex performance enhancement for repeated matchFirst calls

[d-bugmail--- via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=18600

--- Comment #1 from github-bugzi...@puremagic.com ---
Commit pushed to master at https://github.com/dlang/phobos

https://github.com/dlang/phobos/commit/4318073f40ae3e82ac1847da5e037ab2f091d6fc
Fix issue 18600 Revamp std.regex caching for matchFirst case

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[Issue 18600] Regex performance enhancement for repeated matchFirst calls

[d-bugmail--- via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=18600

github-bugzi...@puremagic.com changed:

   What|Removed |Added

 Status|NEW |RESOLVED
 Resolution|--- |FIXED

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