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POCuda - printing string from object in __global__ function
 

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  1. POCuda - printing string from object in __global__ function
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    <p>I am new to CUDA and I am getting a strange error. I want to print a string from a passed object and I get the error "calling host function from global function is not allowed" and I don't know why. But if I want to print an integer (changing get method to return sk1), everything works fine. Here is the code:</p> <pre><code>class Duomenys { private: string simb; int sk1; double sk2; public: __device__ __host__ Duomenys(void): simb(""), sk1(0), sk2(0.0) {} __device__ __host__~Duomenys() {} __device__ __host__ Duomenys::Duomenys(string simb1, int sk11, double sk21) : simb(simb1), sk1(sk11), sk2(sk21) {} __device__ __host__ string Duomenys::get(){ return simb; } }; </code></pre> <p>And here I am calling Duomenys::get from __global__ function:</p> <pre><code>__global__ void Vec_add(Duomenys a) { printf(" %s \n",a.get()); } </code></pre> <p><strong>EDIT:</strong> I am trying to read data from a file and print it in a global function. In this code I am trying read all data and print just one object to see if everything works. This is the error I'm getting:</p> <pre><code> calling a __host__ function("std::basic_string&lt;char, std::char_traits&lt;char&gt;, std::allocator&lt;char&gt; &gt;::~basic_string") from a __global__ function("Vec_add") is not allowed </code></pre> <p><strong>Code:</strong></p> <pre><code>#include &lt;stdio.h&gt; #include &lt;stdlib.h&gt; #include &lt;cuda.h&gt; #include &lt;cuda_runtime.h&gt; #include &lt;vector&gt; #include &lt;string&gt; #include &lt;iostream&gt; #include &lt;fstream&gt; #include &lt;iomanip&gt; #include &lt;string&gt; #include &lt;sstream&gt; using namespace std; class Duomenys { private: string simb; int sk1; double sk2; public: __device__ __host__ Duomenys(void): simb(""), sk1(0), sk2(0.0) {} __device__ __host__~Duomenys() {} __device__ __host__ Duomenys::Duomenys(string simb1, int sk11, double sk21) : simb(simb1), sk1(sk11), sk2(sk21) {} __device__ __host__ string Duomenys::print() { stringstream ss; ss &lt;&lt; left &lt;&lt; setw(10) &lt;&lt; simb &lt;&lt; setw(10) &lt;&lt; sk1 &lt;&lt; setw(10) &lt;&lt; sk2; return ss.str(); } }; __global__ void Vec_add(Duomenys a) { printf(" %s \n",a.print()); } /* Host code */ int main(int argc, char* argv[]) { setlocale (LC_ALL,""); vector&lt;Duomenys&gt; vienas; vector&lt;vector&lt;Duomenys&gt;&gt; visi; //data reading to vector "vienas" (it works without any errors) Duomenys *darr; const size_t sz = size_t(2) * sizeof(Duomenys); cudaMalloc((void**)&amp;darr, sz); Vec_add&lt;&lt;&lt;1, 1&gt;&gt;&gt;(visi[0].at(0)); cudaDeviceSynchronize(); cudaMemcpy(darr, &amp;visi[0].at(0), sz, cudaMemcpyHostToDevice); return 0; } </code></pre>
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    1. COUsing `printf` from within a `__global__` function is only allowed for cards with compute capability >= `2.0`.
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    2. COI know, with printf everything is working perfect ( i can use printf("%s", "text") without any problem), but when I want to print string from object I am getting errors. That's the problem.
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    3. COIs `a` a host or device object?
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