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POC++ Class design for Multi threaded application
 

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  1. POC++ Class design for Multi threaded application
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    <p>I am working on a console application and i would need some suggestions in design. - Priority being, Performance. </p> <p><strong>Class 1</strong></p> <pre><code>Class Get_data_from_Internet{ // Gets data from Internet. // As its html source, the data is stored in a flat file. } </code></pre> <p>This class gets the data from internet using sockets. </p> <p><strong>Class 2</strong></p> <pre><code>Class process_HTML_format_one { // This class processes the data of the HTML file generated above using format ONE. // An example, this format processes HTML text of yahoo.com // Remove all unnecessary HTML Tags. // Extract only the required information. // Fill a structure (struct) with Data. // Update Database. } </code></pre> <p>The above class processes data of a website in a perticular format. </p> <p><strong>Class 3</strong></p> <pre><code>Class process_HTML_format_two { // This class processes the data of the HTML file using format TWO. // An example, this format processes HTML text of MSN.com // Remove all unnecessary HTML Tags. // Extract only the required information. // Fill a structure (struct) with Data. // Update Database. } </code></pre> <p>The above class processes data of website 2 in a predefined format. There are atleast a dozen of such HTML format classes, which would be selected &amp; used as per the URL's. </p> <p><strong>Class 4</strong></p> <pre><code>class start_monitoring { // Get all URL's from DB. (Around 1000 + URL's) // Call "Get_data_from_internet" for each URL. // Process each text file using any of the formats specified/defined above. } </code></pre> <p>The above class retrieves a list of URL's from DB and should process each URL accordingly. </p> <p><strong>Requirement</strong> 1. The Start_monitoring class must process each URL by spawning a thread for each for better performance (to fetch near real time data). (Should it be fine or will it make things worse ? As each thread processes its own data, i think there shouldnt be any issues with this.) 2. Does using C++ threads fine in this case? Because, i cant use POSIX threads as most of the functionality is binded with in individual classes/sub classes. 3. Any other alternatives i should try looking for? </p> <p>Any advice in this regard is highly appreciated. </p>
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    1. USkris123456
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      1. POC++ Class design for Multi threaded application
      1. USAdri C.S.
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      1. USkris123456
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    1. COSo you are going to open 1000+ threads in the same time?
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      1. POC++ Class design for Multi threaded application
      1. USkhajvah
    2. COStarting a thread is also not for free, I dont think you will get good performance by starting up that many threads. It is often better to instead have a pool of threads - say 5 (depends on your HW) - that each pull an URL from a queue when the thread becomes idle, when no more URLs you are done.
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      1. POC++ Class design for Multi threaded application
      1. USAnders K.
    3. CORemember that once the number of threads exceeds the number of cores available on your hardware performance will start to level off and then drop as the overhead required to manage the threads becomes too great.
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      1. POC++ Class design for Multi threaded application
      1. USEamonn McEvoy
 

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