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Make reshape(::BitArray,...) type stable #21670

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merged 1 commit into from
May 3, 2017
Merged

Make reshape(::BitArray,...) type stable #21670

merged 1 commit into from
May 3, 2017

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mbauman
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@mbauman mbauman commented May 2, 2017 •
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This works around some of the performance regressions flagged in #20993. The instability itself is not new nor is it the cause of the regression. The trouble is just that there are a few more inlined functions now, each of which needs a dynamic dispatch.

It is worth noting that 0.6 (with this patch) is significantly faster than 0.5 (with this patch). I measure an improvement of ~30%.

@mbauman
Make reshape(::Bitarray,...) type stable
a6241dc 
This works around some of the performance regressions flagged in #20993. The instability itself is not new nor is it the cause of the regression. The trouble is just that there are a few more inlined functions now, each of which needs a dynamic dispatch.

It is worth noting that 0.6 (with this patch) is significantly faster than 0.5 (with this patch). I measure an improvement of ~30%.
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mbauman commented May 2, 2017

@nanosoldier runbenchmarks(ALL, vs = ":master")

@mbauman mbauman changed the title Make reshape(::Bitarray,...) type stable Make reshape(::BitArray,...) type stable May 2, 2017
@ararslan ararslan added the domain:arrays [a, r, r, a, y, s] label May 2, 2017
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Your benchmark job has completed - possible performance regressions were detected. A full report can be found here. cc @jrevels

Sacha0
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lgtm! :)

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Sacha0 commented May 2, 2017

@nanosoldier runbenchmarks(("array" && "bool") || "simd", vs = ":master")

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Something went wrong when running your job:

NanosoldierError: failed to run benchmarks against primary commit: failed process: Process(`sudo cset shield -e su nanosoldier -- -c ./benchscript.sh`, ProcessExited(1)) [1]

Logs and partial data can be found here
cc @jrevels

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jrevels commented May 2, 2017

Just deployed JuliaCI/Nanosoldier.jl#33, let's see if Nanosoldier can run things on Julia v0.7- now:

@nanosoldier runbenchmarks(("array" && "bool") || "simd", vs = ":master")

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Something went wrong when running your job:

NanosoldierError: failed to run benchmarks against primary commit: failed process: Process(`/home/nanosoldier/workdir/tmp430hB7/julia -e 'Pkg.add("BaseBenchmarks")'`, ProcessExited(1)) [1]

Logs and partial data can be found here
cc @jrevels

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jrevels commented May 2, 2017

Alright, fixed a silly bug in that Nanosoldier patch, let's see how we do now:

@nanosoldier runbenchmarks(("array" && "bool") || "simd", vs = ":master")

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Your benchmark job has completed - possible performance regressions were detected. A full report can be found here. cc @jrevels

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Sacha0 commented May 3, 2017

The ["array","bool","boolarray_true_load!"] regression seems real (or at least notably consistent across nanosoldier runs)?

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mbauman commented May 3, 2017

I can't reproduce it, and I have absolutely zero hypotheses on how this change might affect perf_true_load!($boolarr) negatively. There are no reshapes there, and note that it's the Vector{Bool}, not the BitArray.

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Sacha0 commented May 3, 2017

I can't reproduce it, and I have absolutely zero hypotheses on how this change might affect perf_true_load!($boolarr) negatively. There are no reshapes there, and note that it's the Vector{Bool}, not the BitArray.

lgtm then! :)

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Sacha0 commented May 3, 2017

(That benchmark popped up in #21677 (comment) with an equivalent improvement, further supporting the noise hypothesis.)

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mbauman commented May 3, 2017

Yeah, it seems to frequently appear ±40%. https://github.com/JuliaCI/BaseBenchmarkReports/search?utf8=✓&q=boolarray_true_load+language%3Amd&type=

@KristofferC KristofferC merged commit 253fa74 into master May 3, 2017
@mbauman mbauman deleted the mb/reshaped-bits-stability branch May 3, 2017 19:38
tkelman pushed a commit that referenced this pull request May 4, 2017
@mbauman @tkelman
Make reshape(::Bitarray,...) type stable (#21670)
7b07975 
This works around some of the performance regressions flagged in #20993. The instability itself is not new nor is it the cause of the regression. The trouble is just that there are a few more inlined functions now, each of which needs a dynamic dispatch.

It is worth noting that 0.6 (with this patch) is significantly faster than 0.5 (with this patch). I measure an improvement of ~30%.
(cherry picked from commit 253fa74)
tkelman pushed a commit that referenced this pull request May 4, 2017
@mbauman @tkelman
Make reshape(::Bitarray,...) type stable (#21670)
be46bc8 
This works around some of the performance regressions flagged in #20993. The instability itself is not new nor is it the cause of the regression. The trouble is just that there are a few more inlined functions now, each of which needs a dynamic dispatch.

It is worth noting that 0.6 (with this patch) is significantly faster than 0.5 (with this patch). I measure an improvement of ~30%.
(cherry picked from commit 253fa74)
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