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Optimize cases with long potential simple_keys #555

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merged 3 commits into from
Jan 21, 2020
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cjcullen
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When we build up the simple_keys stack, we count on the (formerly named) staleness check to catch errors where a simple key is required but would be > 1024 chars or span lines. The previous simplification that searches the stack from the top can go 1024 keys deep before finding a "stale" key and stopping. I added a test that shows that this consumes ~3s per 1MB of document size.

I split that staleness check back out into a separate loop so that we don't unnecessarily re-process a bunch of keys just to get down to the ones that might have gone stale.

$ benchcmp old.txt new.txt
benchmark                                old ns/op      new ns/op     delta
Benchmark1000KB100Aliases-6              881167484      872120600     -1.03%
Benchmark1000KBDeeplyNestedSlices-6      48761251       5274819       -89.18%
Benchmark1000KBDeeplyNestedMaps-6        50438114       5292240       -89.51%
Benchmark1000KBDeeplyNestedIndents-6     4385726        4280545       -2.40%
Benchmark1000KB1000IndentLines-6         435702849      432047937     -0.84%
Benchmark1KBMaps-6                       574312         588420        +2.46%
Benchmark10KBMaps-6                      5727272        5895964       +2.95%
Benchmark100KBMaps-6                     52126341       52920733      +1.52%
Benchmark1000KBMaps-6                    484546095      474623653     -2.05%
BenchmarkDeepSlice-6                     455902294      397041567     -12.91%
BenchmarkDeepFlow-6                      399613786      407783513     +2.04%
Benchmark1000KBMaxDepthNested-6          2700904018     447527143     -83.43%

benchmark                                old allocs     new allocs     delta
Benchmark1000KB100Aliases-6              5832425        5832415        -0.00%
Benchmark1000KBDeeplyNestedSlices-6      9066           10081          +11.20%
Benchmark1000KBDeeplyNestedMaps-6        9071           10087          +11.20%
Benchmark1000KBDeeplyNestedIndents-6     10082          10082          +0.00%
Benchmark1000KB1000IndentLines-6         4093516        4093516        +0.00%
Benchmark1KBMaps-6                       3126           3126           +0.00%
Benchmark10KBMaps-6                      30780          30780          +0.00%
Benchmark100KBMaps-6                     307269         307269         +0.00%
Benchmark1000KBMaps-6                    3072079        3072079        +0.00%
BenchmarkDeepSlice-6                     2048121        2048112        -0.00%
BenchmarkDeepFlow-6                      1978104        1978103        -0.00%
Benchmark1000KBMaxDepthNested-6          4079998        4079989        -0.00%

benchmark                                old bytes     new bytes     delta
Benchmark1000KB100Aliases-6              393118344     392792852     -0.08%
Benchmark1000KBDeeplyNestedSlices-6      4689465       4576336       -2.41%
Benchmark1000KBDeeplyNestedMaps-6        4689831       4577450       -2.40%
Benchmark1000KBDeeplyNestedIndents-6     2969924       2969913       -0.00%
Benchmark1000KB1000IndentLines-6         143718512     143718512     +0.00%
Benchmark1KBMaps-6                       218984        218984        +0.00%
Benchmark10KBMaps-6                      2178155       2178154       -0.00%
Benchmark100KBMaps-6                     22002796      22002807      +0.00%
Benchmark1000KBMaps-6                    220560496     220560496     +0.00%
BenchmarkDeepSlice-6                     120114888     119789000     -0.27%
BenchmarkDeepFlow-6                      115058032     115056832     -0.00%
Benchmark1000KBMaxDepthNested-6          146582888     146257064     -0.22%

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@niemeyer niemeyer left a comment

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Thanks for keeping it up.

Here are some initial comments on the issue:

scannerc.go Outdated Show resolved Hide resolved
scannerc.go Outdated Show resolved Hide resolved
efficient lookup in yaml_parser_fetch_value().
@cjcullen
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Thanks again for the first pass. Are you up for considering the addition of the single_key index? I'd like to have something to include in the next set of Kubernetes patch releases around the first week of January.

@cjcullen cjcullen requested a review from niemeyer January 7, 2020 22:23
@niemeyer niemeyer merged commit 53403b5 into go-yaml:v2 Jan 21, 2020
niemeyer added a commit that referenced this pull request Jan 21, 2020
Message from original commit (53403b5):

This change introduces an index to lookup token numbers referenced by simple_keys in O(1),
thus significantly reducing the performance impact of certain abusively constructed snippets.

When we build up the simple_keys stack, we count on the (formerly named) staleness check to
catch errors where a simple key is required but would be > 1024 chars or span lines. The previous
simplification that searches the stack from the top can go 1024 keys deep before finding a "stale"
key and stopping. I added a test that shows that this consumes ~3s per 1MB of document size.
@Abuchtela
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Update gopkg.in/yaml.v2

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4 participants