In the past, when I've worked on long-running C++ daemons I've had to deal with heap fragmentation issues. Tricks like keeping a pool of my large allocations were necessary to keep from running out of contiguous heap space. Is this still an issue with a 64 bit address space? Perf is not a concern for me, so I would prefer to simplif...
Hi, I've written a c/c++ memory manager for heap allocations (overloaded new/delete and malloc/realloc/free, based on Doug Lea's malloc but designed to be wait free) and seem to be having some trouble with fragmentation. Are there any good resources out there that detail good strategies for avoiding fragmentation via the manager? Pleas...
Does anyone have a "hello world" sample or tutorial for creating an Eclipse plugin fragment? I have a working host plugin that, for the sake of simplicity, is just this... public void start(BundleContext context) throws Exception { System.out.println("Hello...."); super.start(context); plugin = this; } public void stop(B...
0:000> !dumpheap -stat total 1755874 objects Statistics: MT Count TotalSize Class Name 7b9b0c64 1 12 System.Windows.Forms.Layout.TableLayout+ColumnSpanComparer .... 7933303c 14006 4926456 System.Collections.Hashtable+bucket[] 65246e00 804 4982192 System.Data.RBTree`1+Node[[System.Int32, mscorlib]]...
A new application that has been developed has a heavy use of web services. We started hitting out of memory exceptions on a regular basis (as usage has increased). Upon reviewing the memory dumps I noticed there were a large number of same sized byte[]. Looking at the handles for these byte[] I noticed that they were referenced by System...
In addition to mark-and-sweep, the garbage collectors for .Net and Java both also run a compaction phase to cut down on memory fragmentation. I am not able to find any documentation on a compaction/defragmentation phase for the Flash 9 garbage collector - does Flash not have any compaction phase? ...
Are there any good memory fragmentation profilers? (linux gcc version would be nice). Valgrind cannot analyze this because it uses custom malloc/free functions. Thanks, Andrew ...
I'm looking to write a self defragmenting memory manager whereby a simple incrementing heap allocator is used in combination with a simple compacting defragmenter. The rough scheme would be to allocate blocks starting at the lowest memory address going upwards and keeping book-keeping information starting at the highest memory address...
Heap fragmentation can cause a server application that is expected to run continuously for many months to suddenly start malfunctioning thinking that it's out of memory. Let's assume that I've done my best to minimize runtime heap fragmentation in my VC++ server application but still it builds up and causes problems. I could for example...
How can I monitor or visualize memory fragmentation of a delphi application? ...
I was reading a blog entry by Josh Smith where he used a cache mechanism in order to "reduce managed heap fragmentation". His caching reduces the number of short-lived objects being created at the cost of slightly slower execution speed. How much of a problem is managed heap fragmentation in a managed language like C#? How can you diagn...
I need to answer a basic question from inside my C program compiled by GCC for Linux: how much of process heap is currently in use (allocated by malloc) and how much resides if free heap blocks. GNU implementation of standard library has mallinfo function which reports exactly what I need, but it only usable with 32-bit configurations an...
Just like in the title, what is a contiguous memory block? ...