pitrou commented on PR #13661:
URL: https://github.com/apache/arrow/pull/13661#issuecomment-1191372761
Ok, so I run locally with gcc 9.4.0 (Ubuntu 20.04) on AMD Zen 2.
### Build times
* `-O3`:
```
real 1m25,888s
user 21m58,527s
sys 0m48,888s
```
* `-O2`:
```
real 1m21,713s
user 20m57,462s
sys 0m48,843s
```
* `-O2 -ftree-vectorize`:
```
real 1m23,461s
user 21m11,970s
sys 0m49,485s
```
### Lib sizes
* `-O3`:
```
text data bss dec hex filename
23230116 326105 2197509 25753730 188f882
build-bundled-release/release/libarrow.so
1276669 24928 2346 1303943 13e587
build-bundled-release/release/libarrow_testing.so
```
* `-O2`:
```
22574451 326665 2197509 25098625 17ef981
build-bundled-release/release/libarrow.so
1268546 25144 2346 1296036 13c6a4
build-bundled-release/release/libarrow_testing.so
```
* `-O2 -ftree-vectorize`:
```
22639315 326713 2197509 25163537 17ff711
build-bundled-release/release/libarrow.so
1257242 25144 2346 1284732 139a7c
build-bundled-release/release/libarrow_testing.so
```
### Compute benchmarks
* `-O2` vs `-O3`:
https://gist.github.com/pitrou/e76b89f7e7e1f0e9a361410286c4a198
* `-O2 -ftree-vectorize` vs `-O3`:
https://gist.github.com/pitrou/feefd0819a513e6068dcd17b12d875e6
* `-O2 -ftree-vectorize` vs `-O2`:
https://gist.github.com/pitrou/083d0abd3f404be47716ae31cddda2db
All in all, in this case:
* the size and build time reductions are significant but small (less than 5%)
* `-ftree-vectorize` brings a net performance improvement over bare `-O2`
* performance seems globally comparable between `-O2 -ftree-vectorize` and
`-O3`, despite some large disparities in individual micro-benchmarks
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