Task Manager doesn’t show the total that the application has allocated from Windows. What it shows (by default) is the working set. The working set is a concept that’s designed to try and minimize page file thrashing in memory-constrained conditions. It’s basically all the pages in memory that the application touches on a regular basis, … Read more
The appropriate way to limit memory usage in RabbitMQ is using the vm_memory_high_watermark. You said: I’ve also tried setting the vm_memory_high_watermark to a few different values below the default (of 40%), even as low as 5%. This should work, but it might not be behaving the way you expect. In the logs, you’ll find a … Read more
No, a StringBuilder is a purely managed resource. You should just get rid of all references to it. Everything else is taken care of by the garbage collector: StringBuilder sb = …; // … do work sb = null; // or simply let it go out of scope. In .NET, there’s no deterministic delete (like … Read more
I’ve seen two different non-intrusive approaches to this: The smart pointer allocates a small block of memory to contain the reference counter. Each copy of the smart pointer then receives a pointer to the actual object and a pointer to the reference count. In addition to an object pointer, each smart pointer contains a previous … Read more
I encountered same issue: every time you get it, you have to allocate more space and run DBeaver itself first with additional flags -vmargs -Xmx*m. Replace * with 2048 or 4096. It doesn’t look like DBeaver takes garbage out when closing the script, so I had to restart application many times to check right amount … Read more
delete [] does know the size that was allocated. However, that knowledge resides in the runtime or in the operating system’s memory manager, meaning that it is not available to the compiler during compilation. And sizeof() is not a real function, it is actually evaluated to a constant by the compiler, which is something it … Read more
The short answer To find out how large an object is, I would use a profiler. In YourKit, for example, you can search for the object and then get it to calculate its deep size. This will give a you a fair idea of how much memory would be used if the object were stand … Read more
In a manner of speaking, when you perform array (“indexed”) type addressing with general registers, you are doing essentially the same thing as the segment registers. In the bad old days of 8-bit and 16-bit programming, many applications required much more data (and occasionally more code) than a 16-bit address could reach. So many CPUs … Read more
Caveat: I stand by this answer since I think it presents a best practice which will improve ~95% of C++ code – probably even more. That said, please read the full comments for a discussion of some important caveats. Since it was my comment, here’s my presentation explaining this. In a nutshell: [Raw] pointers must. not. … Read more
Top command reflects the total amount of memory used by the Java application. This includes among other things: A basic memory overhead of the JVM itself the heap space (bounded with -Xmx) The permanent generation space (-XX:MaxPermSize – not standard in all JVMs) threads stack space (-Xss per stack) which may grow significantly depending on … Read more