Hello everybody.
I am trying to fully understand massif results.. I have the following code:
#include <string>
#include <unistd.h>
std::string *giveLargeObject ()
{
return new std::string
("341234123412341234123412341234dfasfasdfassdfasdfasdfasdfasdfasdfasdfasdfasdfasdfaqddfasd");
}
int
main ()
{
std::string *stringArray [100];
for (unsigned int i = 0; i < 100; ++i)
stringArray [i] = giveLargeObject ();
sleep (1);
for (unsigned int i = 0; i < 100; ++i)
delete stringArray[i];
return 0;
}
massif outputs the following:
== 0 ===========================
Heap allocation functions accounted for 53.1% of measured spacetime
Called from:
51.1% : 0x40D9FFA: std::string::_Rep::_S_create(unsigned, unsigned,
std::allocator<char> const&) (in /usr/lib/libstdc++.so.6.0.8)
2.0% : 0x8048667: giveLargeObject() (massif1.cc:8)
== 1 ===========================
Context accounted for 51.1% of measured spacetime
0x40D9FFA: std::string::_Rep::_S_create(unsigned, unsigned,
std::allocator<char> const&) (in /usr/lib/libstdc++.so.6.0.8)
Called from:
51.1% : 0x40DAE14: (within /usr/lib/libstdc++.so.6.0.8)
---------------------------------
Context accounted for 2.0% of measured spacetime
0x8048667: giveLargeObject() (massif1.cc:8)
Called from:
2.0% : 0x80486FB: main (massif1.cc:17)
what I dont understand at all is that 2.0% accounted for giveLargeObject
()...I understand more heap memory its being allocated from
std::string::string constructor.. where else is consumed that 2.0% of heap
allocation?
I also dont understand at all the postscript output .. the fringe called
"stack(s)".. what massif means as stack? it is not supposed to be a heap
profiler?
Thanks in advance
Roberto.
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