Hello,
I am entirely new to Valgrind and have just installed it on a Linux Mint
system by running "apt-get install valgrind". To get started, I did run
cachegrind on a very simple C program, which did nothing more than to
add two integer variables. This is the result I got:
==12404== I refs: 101,339
==12404== I1 misses: 711
==12404== LLi misses: 704
==12404== I1 miss rate: 0.70%
==12404== LLi miss rate: 0.69%
==12404==
==12404== D refs: 38,424 (25,653 rd + 12,771 wr)
==12404== D1 misses: 1,696 ( 1,210 rd + 486 wr)
==12404== LLd misses: 1,502 ( 1,043 rd + 459 wr)
==12404== D1 miss rate: 4.4% ( 4.7% + 3.8% )
==12404== LLd miss rate: 3.9% ( 4.0% + 3.5% )
I was surprised by the relatively large amount of instructions executed,
so I did the following:
mint ~ $ cat test.c
int main() {
return 0;
}
mint ~ $ gcc test.c -o test
mint ~ $ valgrind --tool=callgrind ./test
==12430== Callgrind, a call-graph generating cache profiler
==12430== Copyright (C) 2002-2013, and GNU GPL'd, by Josef Weidendorfer
et al.
==12430== Using Valgrind-3.10.0.SVN and LibVEX; rerun with -h for
copyright info
==12430== Command: ./test
==12430==
==12430== For interactive control, run 'callgrind_control -h'.
==12430==
==12430== Events : Ir
==12430== Collected : 101336
==12430==
==12430== I refs: 101,336
mint ~ $ callgrind_annotate callgrind.out.12430
--------------------------------------------------------------------------------
Profile data file 'callgrind.out.12430' (creator: callgrind-3.10.0.SVN)
--------------------------------------------------------------------------------
I1 cache:
D1 cache:
LL cache:
Timerange: Basic block 0 - 22401
Trigger: Program termination
Profiled target: ./test (PID 12430, part 1)
Events recorded: Ir
Events shown: Ir
Event sort order: Ir
Thresholds: 99
Include dirs:
User annotated:
Auto-annotation: off
--------------------------------------------------------------------------------
Ir
--------------------------------------------------------------------------------
101,336 PROGRAM TOTALS
--------------------------------------------------------------------------------
Ir file:function
--------------------------------------------------------------------------------
21,478 /build/buildd/eglibc-2.19/elf/dl-lookup.c:do_lookup_x
[/lib/x86_64-linux-gnu/ld-2.19.so]
17,844 /build/buildd/eglibc-2.19/elf/dl-lookup.c:_dl_lookup_symbol_x
[/lib/x86_64-linux-gnu/ld-2.19.so]
16,283
/build/buildd/eglibc-2.19/elf/../sysdeps/x86_64/dl-machine.h:_dl_relocate_object
8,247 /build/buildd/eglibc-2.19/elf/do-rel.h:_dl_relocate_object
8,231
/build/buildd/eglibc-2.19/string/../sysdeps/x86_64/multiarch/../strcmp.S:strcmp'2
[/lib/x86_64-linux-gnu/ld-2.19.so]
4,224 /build/buildd/eglibc-2.19/elf/dl-lookup.c:check_match.9458
[/lib/x86_64-linux-gnu/ld-2.19.so]
2,226
/build/buildd/eglibc-2.19/string/../sysdeps/x86_64/rtld-memset.S:memset
[/lib/x86_64-linux-gnu/ld-2.19.so]
1,179
/build/buildd/eglibc-2.19/elf/dl-version.c:_dl_check_map_versions
[/lib/x86_64-linux-gnu/ld-2.19.so]
1,169
/build/buildd/eglibc-2.19/string/../sysdeps/x86_64/multiarch/../strcmp.S:strcmp
[/lib/x86_64-linux-gnu/ld-2.19.so]
1,147 /build/buildd/eglibc-2.19/elf/dl-load.c:_dl_map_object_from_fd
[/lib/x86_64-linux-gnu/ld-2.19.so]
1,058 /build/buildd/eglibc-2.19/elf/dl-deps.c:_dl_map_object_deps
[/lib/x86_64-linux-gnu/ld-2.19.so]
1,018 /build/buildd/eglibc-2.19/string/../string/memcmp.c:bcmp
[/lib/x86_64-linux-gnu/ld-2.19.so]
1,014 /build/buildd/eglibc-2.19/elf/dl-minimal.c:strsep
[/lib/x86_64-linux-gnu/ld-2.19.so]
[...]
Since none of these functions were called by the program above, I wonder
if this how the output is supposed to look. Were are these function
calls coming from then? Or could there be something wrong with the way I
installed Valgrind?
Best regards,
Jon
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