davide at well-typed.com
Fri Jun 26 11:06:20 UTC 2020
skip to the list at the bottom for TL;DR
Every time I get an email about perf notes my heart sinks a little.
Hopefully there isn't a big issues here.
First of all, what commit is your branch based on? Have you rebased on a
The output you posted says "...increased from x86_64-linux-deb9 baseline
@ HEAD~28". So this means it is using metrics from CI as a baseline
(that's the "x86_64-linux-deb9" part), but the baseline is from 28
commits ago (that's the "HEAD~28" part). The baseline seems a bit old.
Also looking at gitlab CI, there are a lot of recent commits on master
without completed CI runs. So this might be a matter of waiting for CI
to finish, then fetching the CI metrics again. Any way this may help:
1. Rebase of the latest master
2. Wait for CI to finish on a more recent commit (see
3.git fetch https://gitlab.haskell.org/ghc/ghc-performance-notes.git
4. Re run the tests
Alternatively you can generate local metrics
1. Checkout a recent commit to use as the baseline (make sure the
working tree is clean)
2. Run the relevant perf tests
3. Checkout your branches HEAD commit again
4. Run the relevant tests again.
If that doesn't do it, I can have a closer look.
On 6/26/20 11:29 AM, Simon Peyton Jones via ghc-devs wrote:
> Despite a recent
> git fetch https://gitlab.haskell.org/ghc/ghc-performance-notes.git
> I’m getting lots of perf regressions in HEAD. For example
> =====> T9203(normal) 1 of 1 [0, 0, 0]
> ]0;T9203(normal) 1 of 1 [0, 0, 0]cd "T9203.run" &&
> "/home/simonpj/code/HEAD-3/inplace/bin/ghc-stage2" -o T9203 T9203.hs
> -dcore-lint -dstg-lint -dcmm-lint -no-user-package-db -rtsopts
> -fno-warn-missed-specialisations -fshow-warning-groups
> -fdiagnostics-color=never -fno-diagnostics-show-caret -Werror=compat
> -dno-debug-output -O2<
> cd "T9203.run" && ./T9203 +RTS -V0 -tT9203.stats --machine-readable
> -RTS <
> runtime/bytes allocated increased from x86_64-linux-deb9 baseline @
> Expected T9203 (normal) runtime/bytes allocated: 56046952.0 +/-5%
> Lower bound T9203 (normal) runtime/bytes allocated: 53244604
> Upper bound T9203 (normal) runtime/bytes allocated: 58849300
> Actual T9203 (normal) runtime/bytes allocated: 108464536
> Deviation T9203 (normal) runtime/bytes allocated: 93.5 %
> *** unexpected stat test failure for T9203(normal)
> Performance Metrics (test environment: local):
> T9203(normal) runtime/bytes allocated 108464536.000
> (baseline @ HEAD~28)
> 56046952.000 [increased, 93.5%]
> What am I doing wrong?
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> ghc-devs at haskell.org
David Eichmann, Haskell Consultant
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