[Info-vax] x86-64 VMS executable image sizes and memory requirements ?

[osuvman50 at gmail.com]

On Saturday, December 21, 2019 at 11:16:59 AM UTC-5, already... at yahoo.com wrote:
> Few numbers for clang/LLVM on x86-64 (not VMS, of course)
> 
> Option .text size
> -O0 75456
> -Oz 45772
> -Os 44992
> -O1 56836
> -O2 45220
> -O3 46084
> 

Clearly, DEC C isn't clang. Building the sqlite3shr shareable image on alpha
with different /optimization levels gives (size in disk blocks):

  sqlite3shr-O0.exe;1             2676
  sqlite3shr-O1.exe;1             2405
  sqlite3shr-O2.exe;1             3513
  sqlite3shr-O3.exe;1             3710
  sqlite3shr-O4.exe;1             3710
  sqlite3shr-O5.exe;1             3820

If I link /notrace, however, the file sizes change to:
  sqlite3shr-O0.exe;1             2099
  sqlite3shr-O1.exe;1             1835
  sqlite3shr-O2.exe;1             1837
  sqlite3shr-O3.exe;1             1962
  sqlite3shr-O4.exe;1             1962
  sqlite3shr-O5.exe;1             2059

I presume line number tracking is a lot more complicated for optimized code.

The respective $CODE$ sizes are:
  sqlite3shr-O0.map;1           880492
  sqlite3shr-O1.map;1           749156
  sqlite3shr-O2.map;1           773240
  sqlite3shr-O3.map;1           837496
  sqlite3shr-O4.map;1           837496
  sqlite3shr-O5.map;1           886824