1330
92%
master: 91%

Ran 09 Dec 2019 06:47PM UTC

Jobs 11

Files 160

Run time 4min

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Build # 1330

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travis-ci

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web-flow

Commit Message

Merge #923

923: Preserve caches on context switch v2 r=hgrecco a=crusaderky

Fix bug in #909 where, every time a context is reactivated, it creates a brand new entry in UnitRegistry._caches - thus not only nullifying the whole point of the PR, but also creating a nasty memory leak for users that invoke ``.to`` with an inline context many times.

Not sure what went wrong with the first PR - if I rerun the included benchmark, it doesn't reproduce the same results anymore and clearly shows that nothing is cached.

Same benchmark with this PR:
```python
import pint
ureg = pint.UnitRegistry()
src = ureg('1 m')
dst = ureg.Unit('km')
%timeit src.to(dst)
%timeit -n 1 -r 1 src.to(dst, 'chemistry')
%timeit src.to(dst, 'chemistry')
ureg.enable_contexts('chemistry')
%timeit src.to(dst)
```
29.9 µs ± 1.4 µs per loop (mean ± std. dev. of 7 runs, 10000 loops each)
57.3 ms ± 0 ns per loop (mean ± std. dev. of 1 run, 1 loop each)
76.9 µs ± 1.69 µs per loop (mean ± std. dev. of 7 runs, 10000 loops each)
43.7 µs ± 955 ns per loop (mean ± std. dev. of 7 runs, 10000 loops each)

Co-authored-by: Guido Imperiale <crusaderky@gmail.com>

Run Details

29110 of 33854 relevant lines covered (85.99%)

9.31 hits per line

Jobs

ID	Job ID	Ran	Coverage
1	1330.1 (PKGS="python=3.6")	09 Dec 2019 06:47PM UTC	77.79	Travis Job 1330.1
2	1330.2 (PKGS="python=3.7")	09 Dec 2019 06:47PM UTC	77.79	Travis Job 1330.2
3	1330.3 (PKGS="python=3.8")	09 Dec 2019 06:47PM UTC	78.16	Travis Job 1330.3
4	1330.4 (PKGS="python=3.6 uncertainties=3.0")	09 Dec 2019 06:47PM UTC	87.92	Travis Job 1330.4
5	1330.5 (PKGS="python=3.7 uncertainties=3.0")	09 Dec 2019 06:47PM UTC	87.92	Travis Job 1330.5
6	1330.6 (PKGS="python=3.6 numpy=1.14")	09 Dec 2019 06:49PM UTC	86.06	Travis Job 1330.6
7	1330.7 (PKGS="python=3.7 numpy=1.14")	09 Dec 2019 06:49PM UTC	85.97	Travis Job 1330.7
8	1330.8 (PKGS="python=3.8 numpy=1.17")	09 Dec 2019 06:50PM UTC	86.27	Travis Job 1330.8
9	1330.9 (PKGS="python=3.6 numpy=1.14 uncertainties=3.0")	09 Dec 2019 06:49PM UTC	87.92	Travis Job 1330.9
10	1330.10 (PKGS="python=3.7 numpy=1.14 uncertainties=3.0")	09 Dec 2019 06:50PM UTC	87.92	Travis Job 1330.10
12	1330.12 (PKGS="python=3.7 numpy uncertainties")	09 Dec 2019 06:51PM UTC	87.92	Travis Job 1330.12

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