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.NET Forum / .NET Framework / CLR / December 2007How To Avoids CLR GC operation
Hello; I am trying to write a c# .net code where no GC un-timed memory operation. the purpose of which is to allow the code to be responsive in real time as possible. what are the steps to talk in selecting type of objects and variable. do we use a single class for the program? how to make all structures and variables persistence not subject to GC? what makes a method or functions persistence not subject to GC? thank you  Signatureelwolv >I am trying to write a c# .net code where no GC un-timed memory operation. >the purpose of which is to allow the code to be responsive in real time as [quoted text clipped - 4 lines] >how to make all structures and variables persistence not subject to GC? >what makes a method or functions persistence not subject to GC? I'm not sure I understand what you're asking, but it sounds like you want to disable GC completely in your application. That's simply not possible. Mattias SignatureMattias Sjögren [C# MVP] mattias @ mvps.org http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com Please reply only to the newsgroup. The construct you're looking for is called a Constrained Execution Region. It's not quite what you want, but it's likley very close. Documentation: http://msdn2.microsoft.com/en-us/library/ms228973.aspx MSDN Article on the topic: http://msdn.microsoft.com/msdnmag/issues/05/10/Reliability/default.aspx ... Note: This isn't suitable for an entire application, but rather regions of code. If that's your goal, you should use C++ or Delphi, as a managed language (.Net, Java) isn't going to cut it. -- Chris Mullins > Hello; > [quoted text clipped - 8 lines] > > thank you Hello; thank you for your reply. I understand your comment. gc can not be disabled and c# managed clr will kick in when it is become needed (out of my control) and .net can not be made real time response restate my question: there are structures that is persistence in memory and GC does not collect and remove. what is would be recommended to use such structures in simple c# program to make gc has no need to collect memory, if all the objects are persistence? thank you Signatureelwolv > The construct you're looking for is called a Constrained Execution Region. > It's not quite what you want, but it's likley very close. [quoted text clipped - 24 lines] > > > > thank you The question is easy to answer: Make the Static. This will put them on the high frequency heap, and they won't ever be collected. ... now, with that said, this is probably pretty silly. What are you building that you think GC will just wreck? Given you level of knowledge about .Net, I would guess you haven't tried any of this yet, and are shooting in the dark. If this is the case, you may want to step back and take a bigger look at things. Figure out your performance and latency requirements, and from there determine if you can use .Net or not. In the best case, you're guilty of waaaaay premature optimization, and you're going to make things worse rather than better. -- Chris Mullins > Hello; > [quoted text clipped - 49 lines] >> > >> > thank you hello; thank you for your response. I am trying to use .met MF to issue motor control commands commands can't be delayed for GC action. Since GC is the system in .net MF it is the one who use/steals cycles from the cpu. By using static we can help continuous stream of commands without any un-timed GC latency. yes; .net MF/XP are not real time system and only windows CE/Linux are real time OS., However, .net MF CLR is the OS to be concern on the system. my question now would be: 1- is there any specific technique for CLR (known to you as more knowledgeable) to be used in this manner to help keep the commands flow without interruption? 2- short of using real time OS, I want to use .net MF; because it is easy to use and less time consuming and is really a good way to use embedded MCU. then what is the best ways to do that with the understanding, that we can't make .net MF a complete zero latency? there is enough RAM to hold a program. thank you Signatureelwolv > The question is easy to answer: Make the Static. This will put them on the > high frequency heap, and they won't ever be collected. [quoted text clipped - 68 lines] > >> > > >> > thank you You're up against a target I don't think you're going to hit based on advice from a newsgroup. Go out, write some prototype code, and get it running. When it doesn't work, keep trying various approaches until you get something you like. I suspect you're going to get the compact framework, running on a mobile device, to work as well as you're hoping. I would like to be wrong, but based on my work with the Compact Framework, you've got an uphill battle on your hands. I suspect GC will be one of your concerns, but will be far from the last... -- Chris Mullins > hello; > [quoted text clipped - 109 lines] >> >> > >> >> > thank you > hello; > [quoted text clipped - 6 lines] > By using static we can help continuous stream of commands without any > un-timed GC latency. By eliminating allocations (after startup) I think you should be able to prevent the GC from running. To do that, you'll need to pool your objects. I think you can use LinkedList<T> for that as long as you save the LinkedListNode<T> and simply move it between free and busy lists, always use the methods that take a LinkedListNode because the only will allocate them. Also, I hope you aren't doing any string manipulation, because strings can't be pooled (they are immutable, so the only way to get a new value is to allocate one). Use byte or character arrays instead of strings. If you weren't on MF (where there is no interop layer) I'd say use C or C++ to create a native thread for the realtime operations, and pass buffers back and forth to the managed thread, then don't worry about the GC. > yes; .net MF/XP are not real time system and only windows CE/Linux are > real [quoted text clipped - 98 lines] >> >> > >> >> > thank you
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