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gf: cache cache_with_orig decision #48833

Merged
merged 1 commit into from
Mar 1, 2023
Merged

gf: cache cache_with_orig decision #48833

merged 1 commit into from
Mar 1, 2023

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vtjnash
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@vtjnash vtjnash commented Feb 28, 2023

Memoizing this can save a lot of repeated effort for queries such as @which eltype(String). Otherwise we repeatedly try to check if eltype(::Type) is a good way to cache that result, even though it never gets better the more we check it.

This can make a large difference for some common queries:

julia> @time Base._methods_by_ftype(Tuple{typeof(eltype), Type{Val{7}}}, -1, Base.get_world_counter())
  0.201521 seconds (523.29 k allocations: 27.287 MiB, 4.41% gc time) # before
  0.000111 seconds (38 allocations: 1.797 KiB) # after
1-element Vector{Any}:
 Core.MethodMatch(Tuple{typeof(eltype), Type{Val{7}}}, svec(), eltype(::Type) @ Base abstractarray.jl:234, true)

@vtjnash
gf: cache cache_with_orig decision
9219f82 
Memoizing this can save a lot of repeated effort for queries such as
`@which eltype(String)`. Otherwise we repeatedly try to check if
`eltype(::Type)` is a good way to cache that result, even though it
never gets better the more we check it.
@vtjnash vtjnash added backport 1.9 Change should be backported to release-1.9 compiler:latency Compiler latency labels Feb 28, 2023
topolarity
topolarity approved these changes Feb 28, 2023
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Very nice! 👍

@vtjnash vtjnash added the merge me PR is reviewed. Merge when all tests are passing label Feb 28, 2023
@N5N3 N5N3 merged commit bdcd5e2 into master Mar 1, 2023
@N5N3 N5N3 deleted the jn/cache-cache_with_orig branch March 1, 2023 01:09
@N5N3 N5N3 removed the merge me PR is reviewed. Merge when all tests are passing label Mar 1, 2023
@KristofferC KristofferC mentioned this pull request Mar 3, 2023
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KristofferC pushed a commit that referenced this pull request Mar 3, 2023
@vtjnash
gf: cache cache_with_orig decision (#48833)
d5651bc 
Memoizing this can save a lot of repeated effort for queries such as
`@which eltype(String)`. Otherwise we repeatedly try to check if
`eltype(::Type)` is a good way to cache that result, even though it
never gets better the more we check it.

(cherry picked from commit bdcd5e2)
KristofferC pushed a commit that referenced this pull request Mar 3, 2023
@vtjnash
gf: cache cache_with_orig decision (#48833)
b07fb40 
Memoizing this can save a lot of repeated effort for queries such as
`@which eltype(String)`. Otherwise we repeatedly try to check if
`eltype(::Type)` is a good way to cache that result, even though it
never gets better the more we check it.

(cherry picked from commit bdcd5e2)
vchuravy added a commit that referenced this pull request Mar 6, 2023
@vchuravy
fixup! gf: cache cache_with_orig decision (#48833)
fcde569
@KristofferC KristofferC removed the backport 1.9 Change should be backported to release-1.9 label Mar 6, 2023
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