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    <p>Looks like <a href="http://icl.cs.utk.edu/papi/" rel="noreferrer" title="Performance Application Programming Interface">PAPI</a> has very clean API and works just fine on Ubuntu 11.04. Once it's installed, following app will do what I wanted:</p> <pre><code>#include &lt;stdio.h&gt; #include &lt;stdlib.h&gt; #include &lt;papi.h&gt; #define NUM_EVENTS 4 void matmul(const double *A, const double *B, double *C, int m, int n, int p) { int i, j, k; for (i = 0; i &lt; m; ++i) for (j = 0; j &lt; p; ++j) { double sum = 0; for (k = 0; k &lt; n; ++k) sum += A[i*n + k] * B[k*p + j]; C[i*p + j] = sum; } } int main(int /* argc */, char ** /* argv[] */) { const int size = 300; double a[size][size]; double b[size][size]; double c[size][size]; int event[NUM_EVENTS] = {PAPI_TOT_INS, PAPI_TOT_CYC, PAPI_BR_MSP, PAPI_L1_DCM }; long long values[NUM_EVENTS]; /* Start counting events */ if (PAPI_start_counters(event, NUM_EVENTS) != PAPI_OK) { fprintf(stderr, "PAPI_start_counters - FAILED\n"); exit(1); } matmul((double *)a, (double *)b, (double *)c, size, size, size); /* Read the counters */ if (PAPI_read_counters(values, NUM_EVENTS) != PAPI_OK) { fprintf(stderr, "PAPI_read_counters - FAILED\n"); exit(1); } printf("Total instructions: %lld\n", values[0]); printf("Total cycles: %lld\n", values[1]); printf("Instr per cycle: %2.3f\n", (double)values[0] / (double) values[1]); printf("Branches mispredicted: %lld\n", values[2]); printf("L1 Cache misses: %lld\n", values[3]); /* Stop counting events */ if (PAPI_stop_counters(values, NUM_EVENTS) != PAPI_OK) { fprintf(stderr, "PAPI_stoped_counters - FAILED\n"); exit(1); } return 0; } </code></pre> <p>Tested this on Intel Q6600, it supports up to 4 performance events. Your processor may support more or less.</p>
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    1. POHow to read performance counters on i5, i7 CPUs
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    1. COPAPI is good stuff. It's cross-platform so it works on most platforms, from x86-Windows to IBM BlueGenes.
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