http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46347
--- Comment #1 from rus at google dot com 2010-11-11 23:14:45 UTC ---
The size difference of 100 KB on small tests is actually expected. The vector
instantiation will trigger instantiation of several profile analysis methods.
All these methods use internally unordered_map and some use other standard
library components. I don't know a good way to avoid this.
The compilation time is much higher as well. The precompiled sources increase
from 5,000 lines to 31,000 lines. I wonder if this can be reduced somehow.
However, this is a toy example. I measured binary sizes on medium size
binaries between 1 MB and 10 MB (built -O2 -g0). The numbers are full binary
sizes, not just text size. The profile-mode binaries are in between the
original ones and the debug-mode ones, which makes sense given that
profile-mode doesn't have as much coverage as debug-mode.
Paolo, could you please try to reproduce these ratios independently on a larger
binary? Just to make sure it's not due to some linker mechanism turned on just
in my setup.
Original Profile Debug
Binary 1 8.0M 8.9M 11M
Binary 2 6.0M 6.6M 7.2M
Binary 3 1.5M 2.1M 2.6M
Binary 4 1.6M 2.2M 2.7M
Binary 5 1.6M 2.2M 2.7M
Binary 6 5.8M 6.4M 6.9M
Binary 7 5.9M 6.6M 7.1M
Binary 8 6.4M 7.0M 7.6M
Binary 9 6.0M 6.6M 7.2M
Binary 10 1.6M 2.2M 2.7M
Binary 11 1.7M 2.3M 2.8M
Binary 12 7.4M 8.3M 9.7M
Binary 13 1.5M 2.1M 2.6M
Binary 14 7.4M 8.2M 9.7M
Binary 15 1.5M 2.1M 2.6M
Binary 16 1.6M 2.1M 2.7M
Binary 17 1.6M 2.2M 2.7M
Binary 18 5.9M 6.5M 7.1M
Binary 19 6.0M 6.6M 7.2M
Binary 20 5.7M 6.2M 6.8M
Binary 21 1.5M 2.1M 2.6M
Binary 22 1.2M 1.6M 2.0M
Binary 23 7.6M 8.4M 11M
Binary 24 1.2M 1.7M 2.1M
Binary 25 7.5M 8.3M 9.9M
Binary 26 812K 1.2M 1.4M
Binary 27 1.5M 2.1M 2.6M
Binary 28 1.7M 2.3M 2.8M
Binary 29 8.0K 8.0K 8.0K
Binary 30 8.0K 8.0K 8.0K
Binary 31 8.0K 8.0K 8.0K
Binary 32 8.0K 8.0K 8.0K
Binary 33 1.4M 1.9M 2.4M
Binary 34 1.2M 1.8M 2.2M
Binary 35 1.3M 1.7M 2.1M
Binary 36 1.6M 2.2M 2.7M
Binary 37 812K 1.2M 1.4M
Binary 38 2.2M 2.8M 3.5M
Binary 39 1.1M 1.5M 1.8M
Binary 40 1.6M 2.2M 2.8M
Binary 41 1.7M 2.3M 2.8M
Binary 42 1.5M 2.1M 2.6M
Binary 43 8.0M 8.8M 11M
Binary 44 6.7M 7.3M 8.2M
Binary 45 1.6M 2.1M 2.7M
Binary 46 804K 1.2M 1.4M
