Skip to main content

How to Improve Linq Query Performance by using Parallel/ PLinq

How to Improve Linq Query Performance by using Parallel/ PLinq

I want to highlight the disadvantage first, because if you know the disadvantage you can make a choice if required in your project or not.

Don't use if you have a Single core or dual core CPU's. I found that depending on the complexity of For loop  the CPU performance reaches more than 70-80%  (Not talking about the simple For loop). So if you want to use the parallelism for complex loop make sure you have more than  2 CPU's
Parallelization sometimes cause a  PLinq query to run slower than Linq to object equivalent. Basically it said like queries with few data source elements and fast user delegates are reluctant to speed up much.

Parallel Linq is the parallel implementation of Linq. Parallel Linq implementation on loops provide better performance compared to sequential  loop. Parallel Linq also works like Linq queries operate on any in-memory IEnumerale(of T) data source. PLINQ make full use of all processors on the system. The parallelism is achieved by diving the data source into multiple segments and working each segment on different worker threads on multiple processor.

MaxDegreeOfParallelism  - Upper limit of number of processors irrespective of number of cores(We can only specify the maximum )limit.. So even if also if we don't use the CPU , no extra task will run in parallel. 

Implementation 

List testModelList=GetTestModelList();

Parallel.ForEach(testModelList,
                new ParallelOptions { MaxDegreeOfParallelism = 5 },
                tm=>; {//Do Operations
                  
              });


Reference:http://msdn.microsoft.com/en-us/library/dd460688.aspx

Comments

Popular posts from this blog

How to write secure mvc application using encrypting URL

There are lots ways available to write the secure Mvc application. In my experience I came across lots of secure application in public facing. I want to tell about some of the mechanism I followed.
1- encrypting the URL Parameters and preserving id's encrypted on the client side
1- I always make sure if I pass Id or any sensitive data into the view always make sure it's encrypted. By doing so make sure if we forced to use HTML.hidden or HTML.hidden for have the encrypted values, in action link if I pass any parameters from the client side (eg:- edit or create or navigating between different actions we can make sure that all the values are encrypted)
During the design of the actions results if it's http get I usually encrypt the sensitive data
[httpget]
Public actionresult display()
{
TestModel testModel=new TestModel();
testModel.id= encrypt(id);
Return View(testModel);
}
[httppost]
Public ActionResult Display(string id)
{
Guid d_id= new Guid(decrypt(id));
// do operati…

How to add a stored procedure in Entity Framework

Step1- Open the .edmx file
Step2- Right click in .edmx file and select Update Model from Database


Step3- Select Add tab, select Stored Procedures and select the procedure you want to add and click finish as shown in below figure a

Step4- Build the Entity Project to make sure nothing is broke

Step5- Right click on .edmx file and  select Model Browser



Step6- Model Browser Popup will appear as  below figure. Click on the Strored Procedures in PricingToolModel.Stroe and click the newly added SP (it will appear here)
Step7- The Add Function Import screen will appear

Based on the return we can set up.

If you are returning a multiple column Click on the Get Column Information First, then click the new Complex Type. After that you can see the Return of Collection will select the Complex and a complex type is generated by EF

If its returning scalar you can select which return type like int, string etc...

If its return entitty (means table) please select the correct table from the list..

Click…

Bootstrap Server Side Pagination - alternative to data tables

BackgroundMost of the Web developers are familiar with the Datatable.Net for pagination. DataTables can integrate seamlessly with Bootstrap using Bootstrap's table styling options to present a consistent interface with your Bootstrap driven site / app. The main disadvantage with Data table.net is it is applying the pagination at the client side and for the large data set it can take minutes to load the data. Like every other designer I also faced the problem with Data table.net. So what is the best option to replace the client side paging and searching. So I forced to create a custom module to do the pagination and searching. The below sample don’t support the sorting, but got an option to extend the functionality. Please check my Next Post for sorting functionality The technologies used include, MVC 4.0, HTML5, Bootstarp.css, Knockout. js, Ajax, Web Api 2.0, Linq to SQL and C#. Knockout.js Model’s Filter Modelvar filter = function () { var self = this; self.searchText = ko.observable(…