Benchmark Linq2SQL, Subsonic2, Subsonic3 - Any oth

问题:

I am working with Subsonic 2 more than 3 years now...

After Linq appears and then Subsonic 3, I start thinking about moving to the new Linq futures that are connected to sql.

I must say that I start move and port my subsonic 2 with SubSonic 3, and very soon I discover that the speed was so slow thats I didn't believe it - and starts all that tests.

Then I test Linq2Sql and see also a delay - compare it with Subsonic 2.

My question here is, especial for the linq2sql, and the up-coming dotnet version 4, what else can I do to speed it up ? What else on linq2sql settings, or classes, not on this code that I have used for my messures

I place here the project that I make the tests, also the screen shots of the results.

How I make the tests - and the accurate of my measures.

I use only for my question Google chrome, because its difficult for me to show here a lot of other measures that I have done with more complex programs. This is the most simple one, I just measure the Data Read. How can I prove that. I make a simple Thread.Sleep(10 seconds) and see if I see that 10 seconds on Google Chrome Measure, and yes I see it.

_{(source: planethost.gr)}

here are more test with this Sleep thead to see whats actually Chrome gives.

10 seconds delay
100 ms delay
Zero delay

There is only a small 15ms thats get on messure, is so small compare it with the rest of my tests that I do not care about.

So what I measure

I measure just the data read via each method - did not count the data or database delay, or any disk read or anything like that. Later on the image with the result I show that no disk activity exist on the measures
See this image to see what really I measure and if this is correct

Why I chose this kind of test

Its simple, it's real, and it's near my real problem that I found the delay of subsonic 3 in real program with real data.

Now lets tests the dals

Start by see this image I have 4-5 calls on every method, the one after the other.

The results are. For a loop of 100 times, ask for 5 Rows, one not exist, approximatively..

Simple adonet:81ms
SubSonic 2 :210ms
linq2sql :1.70sec
linq2sql using CompiledQuery.Compile :239ms
Subsonic 3 :15.00sec (wow - extreme slow)

The project http://www.planethost.gr/DalSpeedTests.rar

Can any one confirm this benchmark, or make any optimizations to help me out ?

Other tests

Some one publish here this link http://ormbattle.net/ (and then remove it - don not know why) In this page you can find a really useful advanced tests for all, except subsonic 2 and subsonic 3 that I have here !

Optimizing

What I really ask here is if some one can now any trick how to optimize the DALs, not by changing the test code, but by changing the code and the settings on each dal. For example...

Optimizing Linq2SQL

I start search how to optimize Linq2sql and found this article, and maybe more exist.

Finally I make the tricks from that page to run, and optimize the code using them all. The speed was near 1.50sec from 1.70.... big improvement, but still slow.

Then I found a different way - same idea article, and wow ! the speed is blow up. Using this trick with CompiledQuery.Compile, the time from 1.5sec is now 239ms. Here is the code for the precompiled...

Func<DataClassesDataContext, int, IQueryable<Product>> compiledQuery =
    CompiledQuery.Compile((DataClassesDataContext meta, int IdToFind) =>
                          (from myData in meta.Products
                           where myData.ProductID.Equals(IdToFind)
                           select myData));

StringBuilder Test = new StringBuilder();
int[] MiaSeira = { 5, 6, 10, 100, 7 };

using (DataClassesDataContext context = new DataClassesDataContext())
{
    context.ObjectTrackingEnabled = false;

    for (int i = 0; i < 100; i++)
    {
        foreach (int EnaID in MiaSeira)
        {
            var oFindThat2P = compiledQuery(context, EnaID);

            foreach (Product One in oFindThat2P)
            {
                Test.Append("<br />");
                Test.Append(One.ProductName);
            }
        }
    }
}

Optimizing SubSonic 3 and problems

I make many performance profiling, and start change the one after the other and the speed is better but still too slow. I post them on subsonic group but they ignore the problem, they say that everything is fast...

Here is some capture of my profiling and delay points inside subsonic source code

I have end up that subsonic3 make more call on the structure of the database rather than on data itself. Needs to reconsider the hole way of asking for data, and follow the subsonic2 idea if this is possible.

Try to make precompile to subsonic 3 like I did in linq2Sql but fail for the moment...

Optimizing SubSonic 2

After I discover that subsonic 3 is extreme slow, I start my checks on subsonic 2 - that I have never done before believing that is fast. (and it is)

So its come up with some points that can be faster. For example there are many loops like this ones that actually is slow because of string manipulation and compares inside the loop. I must say to you that this code called million of times ! on a period of few minutes ! of data asking from the program.

On small amount of tables and small fields maybe this is not a big think for some people,

but on large amount of tables, the delay is even more. So I decide and optimize the subsonic 2 by my self, by replacing the string compares, with number compares! Simple. I do that almost on every point that profiler say that is slow. I change also all small points that can be even a little faster, and disable some not so used thinks.

The results, 5% faster on NorthWind database, near 20% faster on my database with 250 tables. That is count with 500ms less in 10 seconds process on northwind, 100ms faster on my database on 500ms process time. I do not have captures to show you for that because I have made them with different code, different time, and track them down on paper.

Anyway this is my story and my question on all that, what else do you know to make them even faster...

For this measures I have use Subsonic 2.2 optimized by me, Subsonic 3.0.0.3 a little optimized by me, and Dot.Net 3.5

回答1:

Aristos, here's the thing I'm having an issue with. You posted a question to our groups and we had a nice, 23-long email exchange. You insisted that SubSonic 3 has problems and you asked me why I haven't fixed this "slow, broken tool".

I tried to explain to you that, with 233 tables, SubSonic has to read the schema of EACH ONE on load up. This isn't typical usage for SubSonic 3, but we do it this way so it's actually FASTER than SubSonic 2 on subsequent loadups.

You're ingoring this. I'm answering you. RBarry left a comment above that I was beind "denigrating". I'm quite frustrated. You seem to think that I haven't benchmarked this thing and I have, MANY MANY times. I can't turn out an ORM with problems like the one you suggested, and I didn't.

You have to understand that if it took SubSonic 10 seconds to run a query, then it wouldn't be used.

So - your answer: 233 tables, scripted out as classes, need to load to Provider memory on first run.

That's too many. SubSonic isn't your tool.

回答2:

I think to get a better Benchmark on these, you should check the time in sql profiler not in google chrome, because in the browser it may be a lot of things affect the speed on the page load.

回答3:

Your speed test is a web page that, to my eyes, looks like your testing how long it takes to load. SubSonic isn't that slow and testing load time in a web page is rather ridiculous.

If you want to truly benchmark something you need to use a Console and run read loops that work against indexed data. What you've done is create a web page and say "let's see what happens on load".

This is flawed for a number of reasons. First - all of the code written needs to be compiled from IL do ML. Because SubSonic generates your code for you, and because I know you have a lot of tables here (300+ if I remember right), you can imagine there's some work going on under the covers on your first load.

To be perfectly honest here - your inexperience is undoing a lot of work I've put in for free, by posting things like "it's slow and not ready". I don't care if people use SubSonic - I do care when people do dumb things (like benchmark web tests) and blame me for it.

回答4:

Based on your example you can improve the performance by using the following code:

 StringBuilder Test = new StringBuilder();
 int[] MiaSeira = { 5, 6, 10, 100, 7 };
 for (int i = 0; i < 100; i++)
 {
     foreach (int EnaID in MiaSeira)
     {
         var Products = (from product in Product.
             where MiaSeira.Contains(product.ProductID)
             select product).ToList();

         if (Products == null || Products.Count == 0)
             continue;

         foreach (Product product in Products)
         {
            Test.Append("<br />");
            Test.Append(product.ProductName);
         }
     }
 }

 txtDebug.Text = Test.ToString();

回答5:

I don't have firsthand experience with subsonic, but if it is doing a bunch of code generation, you might want to post separate results for the first request (cold), and an average of subsequent requests (warm). You should also use a Stopwatch to time just the data extraction part, so you don't conflate other timings into your data.