Memory problems in a big .NET application are a silent killer of sorts. You can eat junk food for a long time ignoring it until one day you face a serious problem. In the case of a .NET program, that serious problem can be high memory consumption, major performance issues, and outright crashes. In this post, you’ll see how to keep our application’s blood pressure at healthy levels. Kubernetes runs the applications in Docker images, and with Docker the container receives the memory limit through the –memory flag of the docker run command. So I was wondering that maybe Kubernetes is not passing in any memory limit, and the .NET process thinks that the machine has a lot of available memory.
In this article, we have seen how to use streams to fetch data from the server and also to create a StreamContent for our request body while sending a POST request. Additionally, we’ve learned more about completion options and how this can help us in achieving better optimization for our application. The vital thing to know here is that working with streams on the client side doesn’t have to do anything with the API level. Our API may or may not work with streams but this doesn’t affect the client side.
If you don’t pay attention to indirect references then you may get an ever-increasing chain of object references building up. They will hang around for ever because the root reference at the start of the chain is static. ASP.NET By default, the application uses Server GC Pattern , And desktop applications use Workstation GC Pattern . In this method, we start by creating a new companyForCreation object with all the required properties. With the JsonSerializer.SerializeAsync method, we serialize our companyForCreation object into the created memory stream.
Improving Net Performance By Reducing Memory Usage
In the Get method, the Include method explicitly tells Entity Framework Core to load the User’s Posts along with their other details. Entity Framework Core is smart enough to understand that the UserId field on the Post model represents a foreign key relationship between Users and Posts. The special part of this scheme is , We from API Returns a pool object , This means that as long as we return from the method , You lose control of it , And can’t release it . To solve this problem , We need to encapsulate the array pool in a releasable object , Then register this object with HttpContext.Response.RegisterForDispose(). On the target object Dispose(), So it’s only in HTTP The request is released when it is completed . When the application stops , This instance will eventually be released .
Those are long-lived temporary objects that are probably going to be promoted to Gen 2. While that’s bad for GC pressure, it’s usually worth the price because caching can really help performance. Reserves some memory for the initial heap segments. Commits a small portion of memory when the runtime is loaded. I’ve read the Bounma blog entry cited, and I can’t connect this statement with the blog, or with the rest of your article. Removal of many allocations and aggressive devirtualization and the tiered compiler of Java makes tight loop coding to run around 2x times faster in my experience .
Microsoft’s counter-argument at the time was that, for most use cases, the mark-and-sweep garbage collector would actually be faster despite the intermittent GC pauses. For my tests that behaviour is desired, since it means each test has a clean database without needing to worry about database teardown. But I have noticed some alarming memory usage when running around 300 tests, so maybe I need to revisit that design. The garbage collector doesn’t free .Net developers from the responsibility of cleaning up after themselves. If it’s been implemented then it’s a signal that there’s something that needs to be cleaned up and it should always be called on completion.
There are many tools to look at performance counters. To find out more, check out my article Use Performance Counters in .NET to measure Memory, CPU, and Everything. Meaning once your app starts there is already reserved memory for your user objects and the run-time doesn’t need to request more from the OS. Provided the app does not leak memory, memory usage would remain stable as objects are allocated and collected. The idea is , If the creation of an object is expensive , We should reuse its instances to prevent resource allocation . An object pool is a collection of preinitialized objects that can be retained and released across threads .
Therefore, there’s still plenty of scope for writing a leaky application in the .Net framework. Developers do need to be aware of what’s going on under the hood as there are a number of common traps for the unwary. Up until now, we were using strings to create a request body and also to read the content of the response. But we can optimize our application by improving performance and memory usage with streams.
Troubleshooting High Memory Usage With Asp Net Core On Kubernetes
It’s also challenging to analyze and understand memory problems . If we run our application, we will see the same result as we had in a previous example. The default value is HttpCompletionMode.ResponseContentRead. It means that the HTTP operation is complete only when the entire response is read together with content. In the previous example, we removed a string creation action when we read the content from the response.
After reading the content, we just deserialize it into the createdCompany object. After that, we create a new stream content object named requestContent using the previously created memory stream. The StreamContent object is going to be the content of our request so, we state that in the code, and we set up the ContentType of our request. The second value is HttpCompletionMode.ResponseHeadersRead. When we choose this option in our HTTP request, we state that the operation is complete when the response headers are fully read.
So, in this article, we are going to learn how to use streams with HttpClient while sending requests and reading the content from responses. We are going to use streams with only GET and POST requests because the logic from the POST request can be applied to PUT, and PATCH. But, the technique stays the same whether it’s simple or harder. But if you monitored a lot of applications you probably know that sometimes memory rises over time. The average consumption slowly rises to higher levels, even though it logically shouldn’t. The reason for that behavior is almost always memory leaks.
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My current focus is on providing architectural leadership in agile environments. This isn’t the only application of the InMemory provider, though. It’s also useful for building integration tests that need to exercise your data access layer or data-related business code.
However, for small app’s not expecting much traffic then GC mode should be considered. @David I just saw your comment after posting almost the exact same comment on the answer to this question. I’m seeing the same challenge — always going to over 300MB. I’m wondering what the baseline RAM usage would be for dotnet core.
When enough time passes, the memory gets near its limit. In a 64-bit process, it depends on the machine constraints. When we’re so near the limit, the garbage collector panics. It starts triggering full memory Gen 2 collections for every other allocation so as not to run out of memory. This can easily slow down your application to a crawl. When even more time passes the memory does reach its limit and the application crashes with a catastrophic OutOfMemoryException.
Furthermore, the GC mode Server GC or Workstation GC has a large impact on the application’s memory usage. If you do need to hunt down memory leaks or high consumption then use a tried and tested profiler like ANTS Profiler. We were previously using Express to handle some aspects of the web workload, and from our own testing we could see that it introduces a layer of performance cost. We were comfortable with that at the time, however the work that Microsoft have invested in the web server capabilities has been a huge win. Unfortunately, at the time, Node.js didn’t provide an easy mechanism to do this, while .NET Core had great concurrency capabilities from day one. This meant that our servers spent less time blocking on the hand off, and could start processing the next inbound message.
- If the variable is reassigned or falls out of scope, the counter is decremented.
- The principles are intended for everyone involved in software, and emphasize that sustainability, on its own, is a reason to justify the work.
- When we’re so near the limit, the garbage collector panics.
- So, as you can see, through the entire method, we work with streams avoiding unnecessary memory usage with large strings.
But, we can improve the solution even more by using HttpCompletionMode. It is an enumeration having two values that control at what point the HttpClient’s actions are considered completed. So, it’s easy to find information about similar problems but it’s very hard to find a single “right” configuration for all these values. Really you’ll have to try what works best for you.
That means that instead of replacing a cache object, you would update an existing object. Which will mean less work for the GC promoting objects and initiating more Gen 0 and Gen 1 collection. By the way, the allocations of new objects are extremely cheap. The only thing you need to worry about is the collections.
Garbage Collection Is In Asp Net Core How To Work In
In both cases , The working set is roughly the same , Stable 450 MB. PhysicaFileProvider It’s a managed class , So all instances will be recycled at the end of the request . After we ensure the successful status code, we use the ReadAsStreamAsync method to serialize the HTTP content and return it as a stream. With this in place, we remove the need for string serialization and crating a string variable. In both cases, the working set is roughly the same, stable at 450 MB. Run dotnet dump analyze to start analyzing the memory dump.
Seeding With Test Data On Startup
Now i’ve gone through some detail regarding memory and ThreadPool. There’s one more thing we had to look at in my case, since we made a lot external API calls and used the network a lot. Unfortunately I don’t have any graphs for when limit was 300MB.
Analyze The Memory Usage Of The Application
In our case though we can see that we use about 404MB of .NET GC memory, but most of it is on the small object heaps. One way to go about it is to check for memory leaks asp net usage every time you see rising memory (as suggested in Tip #5). But the problem with that is that leaks that have a low memory footprint also cause a lot of issues.
After clicking the grid, JetBrains Rider shows us the total number of objects in the heap grouped by their full type name, the number of objects and bytes consumed. Gcroot either on the string or the Product, gives us a list of all the roots, or chains leading to the root, telling us why it is not collected yet. In this case we see that the String is belongs to a Product , and the Product belongs to a List of Products which in turn sits on the stack on Thread 4559.
So if you look through any of the case studies on this blog you can most likely replicate it in dotnet dump. Dotnet dump collects a memory dump similar to the dumps you collect with ProcDump or DebugDiag or any other debugging tool. Many of these are useful when troubleshooting memory leaks, .
The principles are intended for everyone involved in software, and emphasize that sustainability, on its own, is a reason to justify the work. This graph shows rapid strides in performance the leaner, more agile and componentized stack has taken in just a few short months. So much so, that Raygun includes a Real User Monitoring capability to track software performance for customers. Read the latest .NET article on how we achieved a 12% performance lift when updating our API from .NET Core 2.1 to 3.1. It also contains a list of all published articles and an archive of older stuff. Under some loads , We see the first 0 Generation recycling goes on every second .
To make sure you don’t reach this state of affairs, my advice is to actively monitor for memory consumption over time. The best way to do that is to look at the performance counter Process | Private Bytes. You can do it easily with Process explorer or with PerfMon. I’m going to give you some magic numbers but take these with a grain of salt because everything has its own context. For a big application, 10% time in GC is probably a healthy percentage. 20% time in GC is borderline, and anything more means you have a problem.