I have a monitoring web application which has a .Net Backend and a Silverlight frontend. The application crunchs big chunks of data, process them and presentates to user. Then user can interact with the data to see different graphs of log. He/She can unselect dimensions, group some values, choose metrics like transaction count, transaction amount(dollars) etc.
Currently, I combine log data into 3 minute chunks. Then making a lookup from it and sending to clientside. With this raw form of data it's size is optimized for network. On clientside I have a lot of business logic to process this data for presentation. Also when user changes options clientside processes the data according to user's choices.
We have chosen this path to serve this application only from one server. We don't have to scale with the user amount in the company because the whole thing happens on the clientside. This is good but we are sacrificing performance.
I'm really curious about what is going to happen if I choose to do the all computation for user's choices on raw data at the serverside.
-Is it going to be faster?
-Do I need to scale immediately?
-Is Fetching the data only once on the server then caching it something like redis than doing the computations according to user requests better solution?
-If clientside approach is good, do I need to switch to Javascript and Javascript client side MVC frameworks like AngularJS?
And I really don't know how to write the my whole business logic in Javascript at the moment.
Extra Info
Average desktop has 2gb ram and a dual core cpu which is core to duo.
Our servers are in VM cluster. They have scalable ram min 8gb. And 8 core xeon cpus.
100-150 concurrent users can use it.
Every user can do different manipulations on the data. That's why they all have their own data on the clientside.
Thanks
Best Answer
About Offloading processing to client side: Can the client machines handle the business logic processing smoothly? Does other applications (outlook, VS, eclipse, etc) suffer because of the heavy silverlight application?
If the client machines have trouble running the silverlight application, then you need to take some processing to server side, maybe do some conversions from the raw data and send more streamlined data (e.g. JSON/XML) to the clients.
If the silverlight application works fine without impeding your users' work, then it's perfectly OK to offload the business logic to clients since you are saving server side resources.
To answer your questions:
It will be faster on client side but slower on server side. You might need to upgrade the VMs.
Your server will be processing more data than it used to, so you might have to scale if you see its getting slower.
If different user requests fetch the exact same data into the server multiple times, and if fetching is a slow operation, then it is a very good idea to cache it. Based on the amount of data you might use storage systems like Redis.
If you have a standardized set of client machines, then Silverlight is good. You might have to think about javascript based clients if you have Linux, Mac, or Windows systems without Silverlight. Plus, Silverlight and other RIA frameworks are much faster than javascript when you are implementing heavy business logic on the client side.