vasilito
cb424d7448
verify-patch-sanity.py validates every active recipe .patch has internally- consistent hunk line counts — catching the 'malformed patch at line N' failure at commit/CI/preflight time instead of hours into a cook. This cycle hit that class three times (qtwaylandscanner, sddm, xwayland), each only discovered when cookbook tried to apply the patch. Running it across the repo found 29 latent malformed patches (validated against GNU patch: e.g. relibc/P3-sysv-ipc reproduces 'malformed patch at line 22'). They were harmless only because they sit in vendored recipes (baked, not re- applied) — but would fail on any version-bump re-derivation. --fix recounts the hunk headers (body untouched) and repaired all 29. Wired into build-preflight.sh (Phase 1.0D) and redbear-ci.yml, with a unit test (test-patch-sanity.sh). Skips archived/legacy trees and unvalidatable formats (empty placeholders, bare-@@ git hunks).
56 lines
2.0 KiB
ReStructuredText
56 lines
2.0 KiB
ReStructuredText
.. include:: <isonum.txt>
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==================================================
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Performance
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==================================================
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High-Performance Generalized Matrix Multiplication
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--------------------------------------------------
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Polly automatically detects and optimizes generalized matrix multiplication,
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the computation C |larr| α ⊗ C ⊕ β ⊗ A ⊗ B, where A, B, and C are three appropriately sized matrices,
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⊕ and ⊗ operations are originating from the corresponding matrix semiring, and α and β are
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constants, and beta is not equal to zero. It allows to obtain the highly optimized form structured
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similar to the expert implementation of GEMM that can be found in GotoBLAS and its successors. The
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performance evaluation of GEMM is shown in the following figure.
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.. image:: images/GEMM_double.png
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:align: center
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Compile Time Impact of Polly
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----------------------------
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Clang+LLVM+Polly are compiled using Clang on a Intel(R) Core(TM) i7-7700 based system. The experiment
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is repeated twice: with and without Polly enabled in order to measure its compile time impact.
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The following versions are used:
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- Polly (git hash 0db98a4837b6f233063307bb9184374175401922)
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- Clang (git hash 3e1d04a92b51ed36163995c96c31a0e4bbb1561d)
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- LLVM git hash 0265ec7ebad69a47f5c899d95295b5eb41aba68e)
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`ninja <https://ninja-build.org/>`_ is used as the build system.
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For both cases the whole compilation was performed five times. The compile times in seconds are shown in the following table.
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+--------------+-------------+
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|Polly Disabled|Polly Enabled|
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+==============+=============+
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|964 |977 |
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+--------------+-------------+
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|964 |980 |
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+--------------+-------------+
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|967 |981 |
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+--------------+-------------+
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|967 |981 |
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+--------------+-------------+
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|968 |982 |
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+--------------+-------------+
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The median compile time without Polly enabled is 967 seconds and with Polly enabled it is 981 seconds. The overhead is 1.4%.
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