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Revision tags: llvmorg-18.1.8, llvmorg-18.1.7, llvmorg-18.1.6, llvmorg-18.1.5, llvmorg-18.1.4, llvmorg-18.1.3, llvmorg-18.1.2, llvmorg-18.1.1, llvmorg-18.1.0, llvmorg-18.1.0-rc4, llvmorg-18.1.0-rc3, llvmorg-18.1.0-rc2, llvmorg-18.1.0-rc1, llvmorg-19-init, llvmorg-17.0.6, llvmorg-17.0.5, llvmorg-17.0.4 |
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| #
a2441837 |
| 22-Oct-2023 |
Fangrui Song <i@maskray.me> |
[CodeLayout] cache-directed sort: limit max chain size (#69039)
When linking an executable with a slightly larger executable,
ld.lld --call-graph-profile-sort=cdsort can be very slow (see #68638).
[CodeLayout] cache-directed sort: limit max chain size (#69039)
When linking an executable with a slightly larger executable,
ld.lld --call-graph-profile-sort=cdsort can be very slow (see #68638).
```
4.6% 20.7Mi .text.hot
3.5% 15.9Mi .text
3.4% 15.2Mi .text.unknown
```
Add cl option `cdsort-max-chain-size`, which is similar to
`ext-tsp-max-chain-size`, and set it to 128, to improve performance.
In `ld.lld @response.txt --threads=4 --call-graph-profile-sort=cdsort
--time-trace"
builds, the "Total Sort sections" time is measured as follows:
* -mllvm -cdsort-max-chain-size=64: 1.321813
* -mllvm -cdsort-max-chain-size=128: 2.030425
* -mllvm -cdsort-max-chain-size=256: 2.927684
* -mllvm -cdsort-max-chain-size=512: 5.493106
* unlimited: 9 minutes
The rest part takes 6.8s.
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Revision tags: llvmorg-17.0.3, llvmorg-17.0.2 |
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| #
e705b37a |
| 27-Sep-2023 |
Fangrui Song <i@maskray.me> |
[CodeLayout] Add unittest for cache-directed sort
The function reordering algorithm added by https://reviews.llvm.org/D152834 and
used by BOLT (https://reviews.llvm.org/D153039) is untested.
Add so
[CodeLayout] Add unittest for cache-directed sort
The function reordering algorithm added by https://reviews.llvm.org/D152834 and
used by BOLT (https://reviews.llvm.org/D153039) is untested.
Add some tests at the appropriate layer.
Depends on D159526
Differential Revision: https://reviews.llvm.org/D159527
show more ...
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