Testing And Benchmarking in Cilk

Here’s the translation of the Go testing and benchmarking example to Cilk:

Unit testing is an important part of writing principled Cilk programs. The `CilkTest` library provides the tools we need to write unit tests.

For the sake of demonstration, this code is in a single file, but it could be split into multiple files. Testing code typically lives in the same directory as the code it tests.

```cilk
#include <cilk/cilk.h>
#include <cilk/cilktest.h>
#include <iostream>

// We'll be testing this simple implementation of an integer minimum.
int IntMin(int a, int b) {
    if (a < b) {
        return a;
    }
    return b;
}

// A test is created by writing a function with a name beginning with `Test`.
void TestIntMinBasic() {
    int ans = IntMin(2, -2);
    CILK_TEST_EQ(ans, -2);
}

// Writing tests can be repetitive, so it's idiomatic to use a table-driven style,
// where test inputs and expected outputs are listed in a table and a single loop
// walks over them and performs the test logic.
void TestIntMinTableDriven() {
    struct TestCase {
        int a, b, want;
    };
    
    TestCase tests[] = {
        {0, 1, 0},
        {1, 0, 0},
        {2, -2, -2},
        {0, -1, -1},
        {-1, 0, -1}
    };

    for (const auto& tt : tests) {
        int ans = IntMin(tt.a, tt.b);
        CILK_TEST_EQ(ans, tt.want);
    }
}

// Benchmark tests in Cilk are typically implemented using the Cilkscale tool,
// which is part of the OpenCilk project. Here's a simplified version:
void BenchmarkIntMin() {
    const int N = 1000000;
    cilk_for (int i = 0; i < N; ++i) {
        IntMin(1, 2);
    }
}

int main() {
    // Run the tests
    TestIntMinBasic();
    TestIntMinTableDriven();

    // Run the benchmark
    BenchmarkIntMin();

    std::cout << "All tests passed!" << std::endl;
    return 0;
}

To run the tests and benchmark, compile the program with Cilk support and execute it:

$ clang++ -fopencilk -O3 -o test_program test_program.cpp
$ ./test_program
All tests passed!

For more detailed benchmarking, you would typically use the Cilkscale tool, which provides performance analysis for Cilk programs:

$ clang++ -fopencilk -fcilktool=cilkscale -O3 -o test_program test_program.cpp
$ ./test_program
$ cilkscale-report test_program.cilkscale

This will generate a detailed report of the program’s performance, including work and span measurements, which are crucial for understanding the parallel efficiency of Cilk programs.

Note that Cilk’s testing and benchmarking capabilities are different from Go’s built-in testing package. Cilk relies more on external tools and libraries for advanced testing and performance analysis. The CilkTest library used in this example is a simplified representation and may not exist as shown in actual Cilk implementations.

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