On Feb 9, 2011, at 3:56 PM, Ted Kremenek wrote:
> Was there a noticeable impact on compile-time? Memory use?
"Before my patch" is r125182. "After my patch" is r125185. All measurements
except one are the median of 3 approximately similar results as generated on a
not-very-reliable, not-hardly-quiescent laptop.
Cocoa_h.m creates 35700 Stmts/Exprs and 85258 Decls. On a 64-bit platform,
this is a theoretical memory savings of 285,600 bytes for Stmts/Exprs and
682,064 bytes for Decls.
- Before my patch, it allocated 13,008,896 bytes, of which it used
12,449,976, with the remainder being lost to e.g. alignment padding.
A Release build completed 1000 runs (I'm not sure why I did 1000 runs) on
my machine with the following characteristics:
daysthatwere:clang rjmccall$ runN 1000 ../../Release/bin/clang
-fsyntax-only INPUTS/Cocoa_h.m
name avg min med max SD total
user 0.3246 0.3215 0.3247 0.3328 0.0014 324.5585
sys 0.0771 0.0662 0.0819 0.0898 0.0068 77.1401
wall 0.4064 0.3954 0.4088 0.4440 0.0071 406.4173
- After my patch, it allocated 12,779,520 bytes, of which it used 12,164,576.
This is a memory savings of 284,400 bytes (used). 1,328,392 bytes of
Stmt/Expr nodes were allocated overall.
A Release build completed 100 runs on my machine with the following
characteristics:
daysthatwere:clang rjmccall$ runN 100 ../../Release/bin/clang -fsyntax-only
INPUTS/Cocoa_h.m
name avg min med max SD total
user 0.3175 0.3147 0.3172 0.3247 0.0019 31.7507
sys 0.0770 0.0682 0.0780 0.0895 0.0061 7.6987
wall 0.3994 0.3886 0.3990 0.4162 0.0073 39.9351
all_std_headers.cpp creates 69666 Stmts/Exprs and 35101 Decls. On a 64-bit
platform, this is a theoretical memory savings of 557,328 bytes for Stmts/Exprs
and 280,808 bytes for Decls.
- Before my patch, it allocated 12,705,792 bytes, of which it used 12,174,357.
A Release build completed 100 runs on my machine with the following
characteristics:
daysthatwere:clang rjmccall$ runN 100 ../../Release/bin/clang -fsyntax-only
INPUTS/all-std-headers.cpp
name avg min med max SD total
user 0.3725 0.3692 0.3727 0.3765 0.0015 37.2507
sys 0.0474 0.0394 0.0480 0.0463 0.0056 4.7440
wall 0.4237 0.4131 0.4261 0.4322 0.0065 42.3729
- After my patch, it allocated 12,214,272 bytes, of which it used 11,618,501.
This is a memory savings of 555,856 bytes (used). 2,917,712 bytes of
Stmt/Expr nodes were allocated overall.
A Release build completed 100 runs on my machine with the following
characteristics:
daysthatwere:clang rjmccall$ runN 100 ../../Release/bin/clang -fsyntax-only
INPUTS/all-std-headers.cpp
name avg min med max SD total
user 0.3684 0.3657 0.3672 0.3705 0.0017 36.8390
sys 0.0431 0.0358 0.0410 0.0522 0.0078 4.3079
wall 0.4160 0.4069 0.4119 0.4265 0.0086 41.5987
So if I didn't completely kill any scientific validity with biased selection in
my efforts to get around quiescence problems, this is a modest optimization in
running time and a fairly significant optimization of memory usage. Of course,
processing headers only stresses the creation of an AST, not queries against
it, so (say) a static-analyzer benchmark might be worthwhile.
John._______________________________________________
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