javascript - Running multiple threads in parallel using Webworker-Threads for Node.js -


i new using node.js , webworker-threads node.js (https://github.com/audreyt/node-webworker-threads). webworker-threads module based on thread-a-gogo (https://github.com/xk/node-threads-a-gogo).

here summary of problem:

  • i have file called "readfile.js", contains code read csv file passed in, , converts csv data 2d array.

  • i want function ""exports.parsecsv" within "readfile.js" loaded , executed in multiple worker threads, each thread running in parallel.

  • i have file, "test1.js", attempts point 2 using thread pool:

var threads = require('webworker-threads'); var parser = require('./readfile.js');  var numthreads = 3; var threadpool = threads.createpool(numthreads); threadpool.all.eval(parser.parsecsv);  (var = 1; <=3; i++) {     (function(i) {         threadpool.any.eval(parser.parsecsv("csvfile.csv"), function (err, val) {             if (i == 3) {                 console.log("bye!");                 threadpool.destroy();             }         });     })(i); }
  • i have file, "test2.js", attempts point 2 manually creating threads:

function cb (err, result) {     if (err) {          console.log("\n" + " error! error! error!");         throw err;     }     console.log(" no error!");     thread.destroy(); }  var threads = require('webworker-threads'); var parser = require('./readfile.js'); var thread = threads.create();  thread.eval(parser.parsecsv); thread.eval(parser.parsecsv("csvfile.csv"), cb);  thread.eval(parser.parsecsv); thread.eval(parser.parsecsv("csvfile.csv"), cb); thread.eval(parser.parsecsv); thread.eval(parser.parsecsv("csvfile.csv"), cb);
  • when run "test[x].js" file using command node test[x].js in command prompt, threads seem working appears if being executed sequentially, , not in parallel. based on outputs of time each thread starts, print out command prompt window.

how execute multiple webworker-threads run in parallel in background? want threads start @ same time , end @ same (if possible). have looked @ api webworker-threads haven't been able solve problem. once works, use same methodology not read csv files, store contents database.

any appreciated! thank :)


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