xlnt/benchmarks/writer.cpp

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#include <chrono>
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#include <iostream>
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#include <xlnt/xlnt.hpp>
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std::size_t current_time()
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{
return static_cast<std::size_t>(std::chrono::duration<double, std::milli>(std::chrono::system_clock::now().time_since_epoch()).count());
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}
// Create a worksheet with variable width rows. Because data must be
// serialised row by row it is often the width of the rows which is most
// important.
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void writer(int cols, int rows)
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{
xlnt::workbook wb;
auto ws = wb.create_sheet();
for(int index = 0; index < rows; index++)
{
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if ((index + 1) % (rows / 10) == 0)
{
std::string progress = std::string((index + 1) / (1 + rows / 10), '.');
std::cout << "\r" << progress;
std::cout.flush();
}
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for (int i = 0; i < cols; i++)
{
ws.cell(xlnt::cell_reference(i + 1, index + 1)).value(i);
}
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}
std::cout << std::endl;
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auto filename = "data/benchmark.xlsx";
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wb.save(filename);
}
// Create a timeit call to a function and pass in keyword arguments.
// The function is called twice, once using the standard workbook, then with the optimised one.
// Time from the best of three is taken.
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int timer(std::function<void(int, int)> fn, int cols, int rows)
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{
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const auto repeat = std::size_t(3);
auto time = std::numeric_limits<std::size_t>::max();
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std::cout << cols << " cols " << rows << " rows" << std::endl;
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for(int i = 0; i < repeat; i++)
{
auto start = current_time();
fn(cols, rows);
time = std::min(current_time() - start, time);
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}
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std::cout << time / 1000.0 << std::endl;
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return time;
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}
int main()
{
timer(&writer, 100, 100);
timer(&writer, 1000, 100);
timer(&writer, 4000, 100);
timer(&writer, 8192, 100);
timer(&writer, 10, 10000);
timer(&writer, 4000, 1000);
return 0;
}