profiling library smaller than non-profiling,
while it contains more symbols. Why?
Anton Shterenlikht
mexas at bristol.ac.uk
Thu Jul 12 22:31:40 UTC 2012
While updating my port (math/slatec) to use
the new OPTIONS framework, I did some
experiments with the profiling library.
I don't know much about this, so what surprised me
is that the profiling library is smaller:
# ls -al lib*a
-rw-r--r-- 1 root wheel 6582354 Jul 12 22:56 libslatec.a
-rw-r--r-- 1 root wheel 6555122 Jul 12 23:02 libslatec_p.a
#
while it adds .mcount symbol to each object file:
# nm libslatec.a > nm
# nm libslatec_p.a > nmp
# wc nm nmp
16436 36675 373033 nm
17885 39573 413605 nmp
34321 76248 786638 total
# grep -c mcount nmp
1449
# expr 16436 + 1449
17885
#
Using diff I can confirm that the only difference
between the 2 libs is the .mcount symbol for
each object file in the profiling library.
So how can the profiling library be smaller?
--
Anton Shterenlikht
Room 2.6, Queen's Building
Mech Eng Dept
Bristol University
University Walk, Bristol BS8 1TR, UK
Tel: +44 (0)117 331 5944
Fax: +44 (0)117 929 4423
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