c# - Multi threaded web requests performance issue -


i want use multi threaded web requests not getting performance expect.

i running computer 4 cores, 1 gbps of upload , 1 gbps of download.

for test downloading google main page.

the size of data google page ~50 kb.

i sending 1000 requests simultaneously , except complete requests within ~2 seconds takes more 20 seconds complete

my code looks this:

        bool success = threadpool.setminthreads(workerthreads: 2000, completionportthreads: 1000);         success = threadpool.setmaxthreads(2000, 2000);         datetime dt = datetime.utcnow;         parallel.for(0, 1000, (num) =>         {             string url = "https://www.google.co.il/?gfe_rd=cr&dcr=0&ei=ozy3wcmomy7b8affj4f4&gws_rd=ssl";             using (webclient web = new webclient())             {                 byte[] bytes = web.downloaddata(url);             }         }         );         double sec = (datetime.utcnow - dt).totalseconds;         console.writeline(sec);

i think better choice in case using httpclient explicit asynchronous operations , let windows manage thread pool itself.

stopwatch sw = new stopwatch(); sw.start();  (int = 0; < 1000; i++) {     var httpclient = new httpclient();     results[i] = httpclient.getbytearrayasync(@"https://www.google.co.il/?gfe_rd=cr&dcr=0&ei=ozy3wcmomy7b8affj4f4&gws_rd=ssl"); }  var status = task.whenall(results); //whenany if can process results independently var pages = status.result; sw.stop(); double sec = sw.elapsed.totalseconds; console.writeline(sec);

side note: please consider using stopwatch time measurement.


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