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Improve the performance of runtime.Fetch for structures - #833
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The improvement comes from the use of a cache to speed up the retrieval of struct fields. This commit also adds a new benchmark to measure the performance gain. goos: linux goarch: amd64 pkg: github.com/expr-lang/expr cpu: Intel(R) Core(TM) i7-8650U CPU @ 1.90GHz │ /tmp/old.txt │ /tmp/new.txt │ │ sec/op │ sec/op vs base │ _envStruct_noEnv-8 503.3n ± 4% 228.8n ± 3% -54.53% (p=0.000 n=10) │ /tmp/old.txt │ /tmp/new.txt │ │ B/op │ B/op vs base │ _envStruct_noEnv-8 48.00 ± 0% 32.00 ± 0% -33.33% (p=0.000 n=10) │ /tmp/old.txt │ /tmp/new.txt │ │ allocs/op │ allocs/op vs base │ _envStruct_noEnv-8 3.000 ± 0% 1.000 ± 0% -66.67% (p=0.000 n=10)
antonmedv
commented
Sep 16, 2025
Member
So is this only if no env is provided? What is a case of compiling without the knowing which env? |
montag451
commented
Sep 23, 2025
ContributorAuthor
No it's also when the field of a struct is an interface. I didn't pass an env in the test to be sure that OpFetch is used instead of OpLoadField |
antonmedv
self-requested a review
September 24, 2025 09:50
| if value.IsValid() { | ||
| return value.Interface() | ||
| if ok { | ||
| value := v.FieldByIndex(field.Index) |
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We only need field.Index, can we just store that in the map instead of storing all the *reflect.StructField?
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Good catch! I've pushed a new commit to fix that (0fa18af)
antonmedv
approved these changes
Dec 14, 2025
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The improvement comes from the use of a cache to speed up the retrieval of struct fields. This commit also adds a new benchmark to measure the performance gain.