INADA Naoki <songofaca...@gmail.com> added the comment:
This is another memory overhead comparison.
It seems merging constants reduces 2~3% memory usage.
import sys, django, flask
sys._debugmallocstats()
### master branch
class size num pools blocks in use avail blocks
----- ---- --------- ------------- ------------
0 8 1 312 194
1 16 1 135 118
2 24 2 198 138
3 32 22 2690 82
4 40 62 6214 48
5 48 149 12465 51
6 56 254 18260 28
7 64 354 22300 2
8 72 208 11589 59
9 80 124 6173 27
10 88 59 2708 6
...
# bytes in allocated blocks = 9,261,952
### merge-const branch
class size num pools blocks in use avail blocks
----- ---- --------- ------------- ------------
0 8 1 312 194
1 16 1 135 118
2 24 1 161 7
3 32 22 2657 115
4 40 62 6202 60
5 48 102 8501 67
6 56 235 16879 41
7 64 346 21751 47
8 72 204 11387 37
9 80 122 6083 17
10 88 58 2656 12
...
# bytes in allocated blocks = 8,919,824
----------
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<https://bugs.python.org/issue34100>
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