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POOutOfMemory exception when using much thread in C# application
 

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  1. POOutOfMemory exception when using much thread in C# application
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    <p>I'm writing an application in C# that cycles through the articles of a local database copy of Wikipedia. I use a bunch of regexes to find the right information in these articles, launch a thread to fetch an image for each article, save the information and go to the next article.</p> <p>I need to use a list of proxy to download these images to not get banned from google. As proxy can be slow, I use threads to make parallel downloads.</p> <p>If I don't use threads, the application is working right but it takes a while to get all the information.</p> <p>If I use threads, the application is working until it uses around 500 threads and then I get a OutOfMemory exception.</p> <p>The thing is it use only ~300Mo of RAM so it don't uses all the memory of either the total memory availlable (8Go) and the memory allocated to a single 32bit application.</p> <p>Is there a limit of thread per application ?</p> <p><strong>EDIT:</strong></p> <p>Here is the code to download the poster (started with getPosterAsc()).</p> <pre><code> string ddlValue = ""; private void tryDownload(object obj) { WebClient webClientProxy = new WebClient(); Tuple&lt;WebProxy, int&gt; proxy = (Tuple&lt;WebProxy, int&gt;)((object[])obj)[0]; if (proxy != null) webClientProxy.Proxy = proxy.Item1; try { ddlValue = webClientProxy.DownloadString((string)((object[])obj)[1]); } catch (Exception ex) { ddlValue = ""; Console.WriteLine("trydownload:" + ex.Message); } webClientProxy.Dispose(); } public void getPoster(object options = null) { if (options == null) options = new object[2] { toSave, false }; if (!AppVar.debugMode &amp;&amp; AppVar.getImages &amp;&amp; this.getImage) { if (this.original_name != "" &amp;&amp; !this.ambName &amp;&amp; this.suitable) { Log.CountImgInc(); MatchCollection MatchList; string basic_options = ""; string value = ""; WebClient webClient = new WebClient(); Regex reg; bool found = false; if (original_name.Split(' ').Length &gt; 1) image_options = ""; if (!found) { bool succes = false; int countTry = 0; while (!succes) { Tuple&lt;WebProxy, int&gt; proxy = null; if (countTry != 5) proxy = Proxy.getProxy(); try { Thread t = new Thread(tryDownload); if (!(bool)((object[])options)[1]) t.Start(new object[] { proxy, @"http://www.google.com/search?as_st=y&amp;tbm=isch&amp;as_q=" + image_options + "+" + basic_options + "+" + image_options_before + "%22" + simplify(original_name) + "%22+" + " OR %22" + original_name + "%22+" + image_options_after + this.image_format }); else t.Start(new object[] { proxy, @"http://www.google.com/search?as_st=y&amp;tbm=isch&amp;as_q=" + image_options + "+" + basic_options + "+" + image_options_before + "%22" + simplify(original_name) + "%22+" + " OR %22" + original_name + "%22+" + image_options_after + "&amp;biw=1218&amp;bih=927&amp;tbs=isz:ex,iszw:758,iszh:140,ift:jpg&amp;tbm=isch&amp;source=lnt&amp;sa=X&amp;ei=kuG7T6qaOYKr-gafsOHNCg&amp;ved=0CIwBEKcFKAE" }); if (!t.Join(40000)) { Proxy.badProxy(proxy.Item1.Address.Host, proxy.Item1.Address.Port); continue; } else { value = ddlValue; if (value != "") succes = true; else Proxy.badProxy(proxy.Item1.Address.Host, proxy.Item1.Address.Port); } } catch (Exception ex) { if (proxy != null) Proxy.badProxy(proxy.Item1.Address.Host, proxy.Item1.Address.Port); } countTry++; } reg = new Regex(@"imgurl\=(.*?)&amp;amp;imgrefurl", RegexOptions.IgnoreCase); MatchList = reg.Matches(value); if (MatchList.Count &gt; 0) { bool foundgg = false; int j = 0; while (!foundgg &amp;&amp; MatchList.Count &gt; j) { if (MatchList[j].Groups[1].Value.Substring(MatchList[j].Groups[1].Value.Length - 3, 3) == "jpg") { try { string guid = Guid.NewGuid().ToString(); webClient.DownloadFile(MatchList[j].Groups[1].Value, @"c:\temp\" + guid + ".jpg"); FileInfo fi = new FileInfo(@"c:\temp\" + guid + ".jpg"); this.image_size = fi.Length; using (Image img = Image.FromFile(@"c:\temp\" + guid + ".jpg")) { int minHeight = this.cov_min_height; if ((bool)((object[])options)[1]) minHeight = 100; if (img.RawFormat.Equals(System.Drawing.Imaging.ImageFormat.Jpeg) &amp;&amp; img.HorizontalResolution &gt; 70 &amp;&amp; img.Size.Height &gt; minHeight &amp;&amp; img.Size.Width &gt; this.cov_min_width &amp;&amp; this.image_size &lt; 250000) { foundgg = true; image_name = guid; image_height = img.Height; image_width = img.Width; img.Dispose(); if ((bool)((object[])options)[0]) { Mediatly.savePoster(this, (bool)((object[])options)[1]); } } else { img.Dispose(); File.Delete(@"c:\temp\" + guid.ToString() + ".jpg"); } } } catch (Exception ex) { } } j++; } } } webClient.Dispose(); Log.CountImgDec(); } } } public void getPosterAsc(bool save = false, bool banner = false) { ThreadPool.QueueUserWorkItem(new WaitCallback(getPoster), new object[2] { save, banner }); } </code></pre>
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    1. COcan't tell without some codes shown
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      1. USRaptor
    2. CODon't launch a separate thread for each item (image?) you fetch. That will cause at least 500 MB to be allocated (since each thread has at least a stack of 1MB allocated + other resources). You should rather use the [ThreadPool](http://msdn.microsoft.com/en-us/library/system.threading.threadpool.aspx) or [Tasks](http://msdn.microsoft.com/en-us/library/system.threading.tasks.task.aspx) and let them drain the queue. Note: that this is a (over) simplification. Check [this](http://stackoverflow.com/q/145304/21567) SO answer for more details and explanation.
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      1. POOutOfMemory exception when using much thread in C# application
      1. USChristian.K
    3. CO@ShivanRaptor : Can't show the code as the entire code make over 40000 lines.
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      1. USSébastien
 

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