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POCPU utilisation goes to 100% while processing a text file
 

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  1. POCPU utilisation goes to 100% while processing a text file
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    <p>I have a master account file having more than 300000 records. This file is having Office, FA, UUID fields along with other fields. We have a webservice which retuns currently enrolled offices for pilot. </p> <p>I need to generate a output file with unique UUIDs from master account file which are part of pilot. The below is my code. </p> <pre><code>public class Job { static Dictionary&lt;string, string&gt; UUIDOfficeFA = new Dictionary&lt;string, string&gt;(); static Dictionary&lt;string, string&gt; UUIDs = new Dictionary&lt;string, string&gt;(); static string PilotOfficeList = string.Empty; /// &lt;summary&gt; /// /// &lt;/summary&gt; public void RunJob() { try { DirectoryInfo directoryInfo = new DirectoryInfo(ConfigurationSettings.AppSettings["AccountFileFolder"]); if (directoryInfo != null || directoryInfo.Exists == false) { FileInfo[] files = directoryInfo.GetFiles(); DateTime lastWrite = DateTime.MinValue; FileInfo lastWritenFile = null; foreach (FileInfo file in files) { if (file.LastWriteTime &gt; lastWrite) { lastWrite = file.LastWriteTime; lastWritenFile = file; } } if (lastWritenFile != null) { if (RetrieveUUIDs(lastWritenFile)) { WriteFile(); } } else { throw new Exception("No matching account file found for processing"); } } } catch (Exception ex) { throw ex; } } static void WriteFile() { try { string FileName = "Testfile_" + System.DateTime.Now.ToString("yyyyMMddHHmmss") + ".txt"; string Path = ConfigurationSettings.AppSettings["TestFolder"] + @"\" + FileName; StringBuilder sb = new StringBuilder(); foreach (KeyValuePair&lt;string, string&gt; kvp in UUIDs) { sb.AppendLine(kvp.Value); } using (StreamWriter writer = File.AppendText(Path)) { writer.Write(sb.ToString()); writer.Flush(); } } catch (Exception ex) { throw ex; } } static bool RetrieveUUIDs(FileInfo file) { try { using (StreamReader sr = file.OpenText()) { string accountFileData = null; accountFileData = sr.ReadToEnd(); string[] str = accountFileData.Trim().Split(new string[] { "\n" }, StringSplitOptions.None); List&lt;string&gt; AccountInfo = new List&lt;string&gt;(str); if (AccountInfo.Count &gt; 0) { TestWebservice client = new TestWebservice(); GetBrancheListRequest request = new GetBrancheListRequest(); GetBrancheListResponse response =client.GetBrancheList(request); if (response != null) { PilotOfficeList = response.GetBrancheListResult; if (string.IsNullOrEmpty(PilotOfficeList)) { throw new Exception("No branch is enrolled for pilot"); } } } foreach (string accountInfo in AccountInfo) { RetrieveUUID(accountInfo); } } } catch (Exception ex) { throw ex; } return true; } private static void RetrieveUUID(string line) { try { string UUID = line.Substring(2, 50).Trim(); string Office = line.Substring(444, 3).Trim(); string FA = line.Substring(447, 3).Trim(); if (!string.IsNullOrEmpty(PilotOfficeList)) { if (!string.IsNullOrEmpty(UUID) || !string.IsNullOrEmpty(Office)) { if (PilotOfficeList.IndexOf(Office) &gt; -1) { if (!UUIDOfficeFA.ContainsKey(UUID + Office + FA)) { UUIDOfficeFA.Add(UUID + Office + FA, UUID + Office + FA); if (!UUIDs.ContainsKey(UUID)) { UUIDs.Add(UUID, UUID); } } } } } } catch (Exception ex) { throw ex; } } } </code></pre> <p>The issue is when this program runs the CPU utilisation goes to 100%. Although entire job completes within 2 minutes but i can't move this on server beacuse it might cause issue for other apps. Please suggest how i can optimize this so that CPU doesn't goes to 100%. </p> <p>Thank you so much for your help in prior.</p> <p>Note- It appears that following are few major CPU utilization points</p> <pre><code>1- accountFileData = sr.ReadToEnd(); 2- string[] str = accountFileData.Trim().Split(new string[] { "\n" }, StringSplitOptions.None); 3- foreach (string accountInfo in AccountInfo) { RetrieveUUID(accountInfo); } </code></pre>
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    1. USDJay
    1. USDJay
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    1. COAll those nested calls to `.IndexOf` and `.ContainsKey` are probably where the problem is if your master lists are 300k large. Suggest you get a profiler like dotTrace and use it; you can't guess your way out of a performance problem. You have to profile and find exactly where your bottlenecks are. That said, if you have a file with 300 thousand entries and you're trying to manage it with generic lists, it's probably time to start thinking about investing in a database.
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      1. POCPU utilisation goes to 100% while processing a text file
      1. USJ...
    2. COAdd `Thread.Sleep` :)... What is the problem of using available CPU?
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      1. POCPU utilisation goes to 100% while processing a text file
      1. USAlexei Levenkov
    3. CO`catch (Exception ex) { throw ex; }` is pointless. It does nothing but hide the original stack trace (showing the *actual* exception.) Either eliminate the `try`/`catch` or change the body to just `throw;` which will re-throw the original exception.
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      1. POCPU utilisation goes to 100% while processing a text file
      1. USJonathon Reinhart
 

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