URL:
<http://savannah.gnu.org/bugs/?func=detailitem&item_id=16140>
Summary: make 3.81rc2: performance decrease when searching
builtin implicit rules compared to 3.80
Project: make
Submitted by: None
Submitted on: Di 21.03.2006 um 14:33
Severity: 3 - Normal
Item Group: Enhancement
Status: None
Privacy: Public
Assigned to: None
Open/Closed: Open
Component Version: CVS
Platform Version: Any
Fixed Release: None
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Details:
make 3.81rc2 shows a performance decrease of a factor 3 (at least in my case)
compared to make 3.80 in the "everything up to date" case. This can be
narrowed to the part searching the builtin implicit rules. Running 'make -r'
(because the builtins are not necessary in my case) produces identical times
for 3.80 and 3.81rc2.
A significant amount of time is spent in set_file_variables() inside
pattern_search() which has not been called in 3.80 before. OTOH, less time is
spent in file_impossible_p() and file_exists_p() (see attached gprof
reports).
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File Attachments:
-------------------------------------------------------
Date: Di 21.03.2006 um 14:33 Name: gprof-reports.tar.gz Size: 21,19KB By:
None
gprof reports for make 3.80 and 3.81rc2
<http://savannah.gnu.org/bugs/download.php?item_id=16140&item_file_id=3511>
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