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. 


List testModelList=GetTestModelList();

                new ParallelOptions { MaxDegreeOfParallelism = 5 },
                tm=>; {//Do Operations



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
Public actionresult display()
TestModel testModel=new TestModel(); encrypt(id);
Return View(testModel);
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..


Can we store wifi and use it later?

I started using WIFI almost 8 years back (in 2006) when I moved to the UK. Before that, during the engineering degree I studied about WIFI energetically for achieving grades. Nowadays it’s a common friend and every day without her presence, it is awful to envisage. One day my data allowance on the mobile run out and I want to go to an event in central London and want to use the GPS. I had to take map printout and follow the route. I depend a lot on GPS navigation rather than a paper map. So I reached the location half an hour later in the event. Eventually I missed the event and while walking back to the tube station I was thinking about storing the WIFI somehow and using it later, like a battery. People might think why can’t I carry a portable modem and a laptop, but I am thinking about much sophisticated device than that like a battery for the phone. Did anyone think about a life without batteries now? It is there since most of us on this planet born. In 1749 Benjamin Franklin firs…