> On Feb 24, 2019, at 10:06 PM, Eric Snow <ericsnowcurren...@gmail.com> wrote:
>
> I'll look into it in more depth tomorrow. FWIW, I have a few commits
> in the range you described, so I want to make sure I didn't slow
> things down for us. :)
Thanks for looking into it.
FWIW, I can consistently reproduce the results several times in row. Here's
the bash script I'm using:
#!/bin/bash
make clean
./configure
make # Apple LLVM
version 10.0.0 (clang-1000.11.45.5)
for i in `seq 1 3`;
do
git checkout d610116a2e48b55788b62e11f2e6956af06b3de0 # Go back to 2/23
make # Rebuild
sleep 30 # Let the system
get quiet and cool
echo '---- baseline ---' >> results.txt # Label output
./python.exe Tools/scripts/var_access_benchmark.py >> results.txt # Run
benchmark
git checkout 16323cb2c3d315e02637cebebdc5ff46be32ecdf # Go to end-of-day
2/24
make # Rebuild
sleep 30 # Let the system
get quiet and cool
echo '---- end of day ---' >> results.txt # Label output
./python.exe Tools/scripts/var_access_benchmark.py >> results.txt # Run
benchmark
>
> -eric
>
>
> * commit 175421b58cc97a2555e474f479f30a6c5d2250b0 (HEAD)
> | Author: Pablo Galindo <pablog...@gmail.com>
> | Date: Sat Feb 23 03:02:06 2019 +0000
> |
> | bpo-36016: Add generation option to gc.getobjects() (GH-11909)
>
> $ ./python Tools/scripts/var_access_benchmark.py
> Variable and attribute read access:
> 18.1 ns read_local
> 19.4 ns read_nonlocal
These timings are several times larger than they should be. Perhaps you're
running a debug build? Or perhaps 32-bit? Or on VM or some such. Something
looks way off because I'm getting 4 and 5 ns on my 2013 Haswell laptop.
Raymond
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