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POC++ Memory leak while trying to delete first element of linkedlist of pointers
 

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  1. POC++ Memory leak while trying to delete first element of linkedlist of pointers
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    <p>I'm quite new to C++ and I'm having a big problem for two days now. I'm trying to do multithreaded rendering (raycasting, multisampling, ambientocclusion) with posix threads and everytime I run the program, it consumes about 5GB of RAM (after start of threads) until termination. So obviously I have a memory Leak. My working threads work like this:</p> <pre><code>struct Job { AOSampler sampler; Ray ray; bool abool; int someint; . . //no pointers here }; //global //use of C++ STL list list&lt;Job*&gt; * jobs; //Part of thread posix function starts here list&lt;Job*&gt; tjobs; // Mark 1 //Pushing and popping between "tjobs" the threadjobs just for this thread and the global jobpool "jobs". Of course threadsafe with mutex locking. //The thread pops jobs from "jobs" and puts em into "tjobs" while(!tjobs.empty()) { //many calculations but all vars are on stack, besides creating new jobs an pushing them to some other queue, which will be pushed into "jobs" later // !!!THE PROBLEM!!! delete (tjobs.front()); tjobs.pop_front(); // The memory in htop always rises but never decreases! } // jumps to Mark 1 // end of multithread while </code></pre> <p>The code is compiling and running and terminating on many cores but performance is bad(4 ok, 24 bad, its a 24 core machine). I think it might be because of the 5GB memory usage (quarter of all phys. ram), but well OS and cache might not be able to handle this well.</p> <p>I'm desperate about finding a solution to my problem. My googling didn't help me at all. I hop you can do. any help is highly appreciated.</p> <p>Thank you</p> <p>(sorry for my english)</p> <p>Edit1: forgot to mention, that it has no output yet -> I can't verify if it is valid</p> <p>Edit2: Some headers:</p> <pre><code>class AOSampler { public: AOSampler(); /// constructor that initializes the sampler, just calls init AOSampler(vec3 const &amp; normal, vec3 const &amp; color); /// initializes the sampler void init(vec3 const &amp; normal, vec3 const &amp; color); /// returns an importance sampled random direction and the associated weight void sample(vec3 &amp; sampledDirection, vec3 &amp; sampleWeight) const; private: /// orthonormal basis vec3 m_normal; vec3 m_tangent; vec3 m_bitangent; /// diffuse color vec3 m_color; }; class Ray { public: Ray() : tMin(0.001f), tMax(FLT_MAX){} vec3 origin; vec3 direction; float tMin, tMax; }; class vec3 { public: float x,y,z; vec3(); vec3(float a, float b, float c); /// assignment operator that assigns a single scalar value to all components void operator=(float v); /// unsafe element access float operator[](unsigned int i) const { return (&amp;x)[i]; } /// length of the vector float length() const; ///Returns a normalized version of the vector vec3 normalize() const; /// componentwise summation vec3 add(const vec3&amp; a) const; /// componentwise subtraction vec3 subtract(const vec3&amp; a) const; ///compute the dot product which is cos(alpha) * this.Length * a.Length ///where alpha is the (smaller) angle between the vectors float dot(const vec3&amp; a) const; float minComponent() const; float maxComponent() const; ///computes a vector which is orthogonal to both of the input vectors static vec3 cross(const vec3&amp; a, const vec3&amp; b); static vec3 min(const vec3&amp; a, const vec3&amp; b); static vec3 max(const vec3&amp; a, const vec3&amp; b); /// add a vector to this vector void operator+=( vec3 const &amp; v ); /// subtract a vector from this vector void operator-=( vec3 const &amp; v ); }; </code></pre>
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    1. USalex0ptr
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      1. POC++ Memory leak while trying to delete first element of linkedlist of pointers
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      1. POC++ Memory leak while trying to delete first element of linkedlist of pointers
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    1. COand SomeObject is ?
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      1. POC++ Memory leak while trying to delete first element of linkedlist of pointers
      1. USJoão Augusto
    2. COIt seems you have typos in your post. Instead, **copy & paste your debugging testcase** directly into Stack Overflow. Then we won't waste our time.
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      1. USLightness Races in Orbit
    3. COAre you accessing your tjobs list from multiple threads? I don't see any sort of barriers in place for thread safe access of your jobs and list itself I'm pretty sure is not thread-safe.
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      1. POC++ Memory leak while trying to delete first element of linkedlist of pointers
      1. USMichael Dorgan
 

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