benchmark.js

/* eslint-disable no-console, no-unused-vars */
const ExcelJS = require('./lib/exceljs.nodejs.js');

const runs = 3;

(async () => {
  try {
    await runProfiling('huge xlsx file streams', () => {
      return new Promise((resolve, reject) => {
        // Data taken from http://eforexcel.com/wp/downloads-18-sample-csv-files-data-sets-for-testing-sales/
        const workbookReader = new ExcelJS.stream.xlsx.WorkbookReader('./spec/integration/data/huge.xlsx');
        workbookReader.read();

        let worksheetCount = 0;
        let rowCount = 0;
        workbookReader.on('worksheet', worksheet => {
          worksheetCount += 1;
          console.log(`Reading worksheet ${worksheetCount}`);
          worksheet.on('row', row => {
            rowCount += 1;
            if (rowCount % 50000 === 0) console.log(`Reading row ${rowCount}`);
          });
        });

        workbookReader.on('end', () => {
          console.log(`Processed ${worksheetCount} worksheets and ${rowCount} rows`);
          resolve();
        });
        workbookReader.on('error', reject);
      });
    });

    await runProfiling('huge xlsx file async iteration', async () => {
      // Data taken from http://eforexcel.com/wp/downloads-18-sample-csv-files-data-sets-for-testing-sales/
      const workbookReader = new ExcelJS.stream.xlsx.WorkbookReader('spec/integration/data/huge.xlsx');
      let worksheetCount = 0;
      let rowCount = 0;
      for await (const worksheetReader of workbookReader) {
        worksheetCount += 1;
        console.log(`Reading worksheet ${worksheetCount}`);
        for await (const row of worksheetReader) {
          rowCount += 1;
          if (rowCount % 50000 === 0) console.log(`Reading row ${rowCount}`);
        }
      }

      console.log(`Processed ${worksheetCount} worksheets and ${rowCount} rows`);
    });
  } catch (err) {
    console.error(err);
    process.exit(1); // eslint-disable-line no-process-exit
  }
})();

async function runProfiling(name, run) {
  console.log('');
  console.log('####################################################');
  console.log(`WARMUP: Current memory usage: ${currentMemoryUsage({runGarbageCollector: true})} MB`);
  console.log(`WARMUP: ${name} profiling started`);
  const warmupStartTime = Date.now();
  await run();
  console.log(`WARMUP: ${name} profiling finished in ${Date.now() - warmupStartTime}ms`);
  console.log(`WARMUP: Current memory usage (before GC): ${currentMemoryUsage({runGarbageCollector: false})} MB`);
  console.log(`WARMUP: Current memory usage (after GC): ${currentMemoryUsage({runGarbageCollector: true})} MB`);

  for (let i = 1; i <= runs; i += 1) {
    console.log('');
    console.log('####################################################');
    console.log(`RUN ${i}: ${name} profiling started`);
    const startTime = Date.now();
    await run(); // eslint-disable-line no-await-in-loop
    console.log(`RUN ${i}: ${name} profiling finished in ${Date.now() - startTime}ms`);
    console.log(`RUN ${i}: Current memory usage (before GC): ${currentMemoryUsage({runGarbageCollector: false})} MB`);
    console.log(`RUN ${i}: Current memory usage (after GC): ${currentMemoryUsage({runGarbageCollector: true})} MB`);
  }
}

function currentMemoryUsage({runGarbageCollector}) {
  if (runGarbageCollector) global.gc();
  return Math.round((process.memoryUsage().heapUsed / 1024 / 1024) * 100) / 100;
}