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Valgrind

2012-05-19T10:44:53Z

← Older revision		Revision as of 10:44, 19 May 2012
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	With valgrind you can analyze your program's memory behavior.		With valgrind you can analyze your program's memory behavior.
		+
		+	Example:
		+
		+	You write a short program that has a memory leak:
		+	<pre>
		+	#include <iostream>
		+	using namespace std;
		+
		+	void pollute()
		+	{
		+	int* i=new int();
		+	cout << i << " ";
		+	}
		+
		+	int main()
		+	{
		+	{ pollute(); }
		+	}
		+	</pre>
		+	Compile it
		+	g++ main.cpp
		+	and valgrind it:
		+	<pre>
		+	valgrind ./a.out
		+	==21506== Memcheck, a memory error detector
		+	==21506== Copyright (C) 2002-2010, and GNU GPL'd, by Julian Seward et al.
		+	==21506== Using Valgrind-3.6.1 and LibVEX; rerun with -h for copyright info
		+	==21506== Command: ./a.out
		+	==21506==
		+	0x5936040 ==21506==
		+	==21506== HEAP SUMMARY:
		+	==21506== in use at exit: 4 bytes in 1 blocks
		+	==21506== total heap usage: 1 allocs, 0 frees, 4 bytes allocated
		+	==21506==
		+	==21506== LEAK SUMMARY:
		+	==21506== definitely lost: 4 bytes in 1 blocks
		+	==21506== indirectly lost: 0 bytes in 0 blocks
		+	==21506== possibly lost: 0 bytes in 0 blocks
		+	==21506== still reachable: 0 bytes in 0 blocks
		+	==21506== suppressed: 0 bytes in 0 blocks
		+	==21506== Rerun with --leak-check=full to see details of leaked memory
		+	==21506==
		+	==21506== For counts of detected and suppressed errors, rerun with: -v
		+	==21506== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 6 from 6)
		+	</pre>

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