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DrawAllocation: Memory allocations within drawing code


DrawAllocation: Memory allocations within drawing code

By : Knobli
Date : November 22 2020, 10:54 AM
To fix the issue you can do This Lint warning appears when you are allocating memory in a method that is invoked frequently to draw something on the screen. Allocating and deallocating memory can be avoided by allocating the memory up front, which leads to increased performance.
Code example. For example, we have some class that extends View. We override its onDraw() method:
code :
@Override
protected void onDraw(Canvas canvas) {
    // following line allocates memory - really bad place for that
    Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.icon);
    canvas.drawBitmap(bitmap, 100, 100, null);
}
private Bitmap bitmap; 

public OurView(Context context) {
   super(context);
   // pre-allocate bitmap so we can use it later
   bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.icon);
}

@Override
protected void onDraw(Canvas canvas) {
    // much faster - no allocation/deallocation of bitmap
    canvas.drawBitmap(bitmap, 100, 100, null);
}


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iOS -- Using and Understanding Instruments using Allocations and Memory Monitor (Physical Memory Free)

iOS -- Using and Understanding Instruments using Allocations and Memory Monitor (Physical Memory Free)


By : MP93
Date : March 29 2020, 07:55 AM
wish helps you Instruments as a tool for debugging is simply excellent. From what I can understand, you have been trying to use the allocations tool, so I'll go over that. Allocations details the number of objects your application allocates during it's execution, along with their in-memory references, locations, even the calling code that allocates said objects. When instruments starts running the allocations tool, your application begins reporting all allocations as blue dots, which pile up higher and higher as your application executes (naturally, as you should be allocating more and more objects). Overall Bytes displays the amount of memory EVERY allocation your app has made added together. I want to stress this for your case: it does not mean your app is currently using 50 mb of memory!, it just means that your app has used 50 mb total. Your app is obviously limited to the amount of memory the device has, and 3-4 mb is not a lot when you consider that the first gen. iPhone had about 128mb, but for more complicated applications, the OS will usually kill off other applications before it kills yours.
As for the other allocation graph with spikes, rather than a continuous line graph, that is to detail the number of allocations going on at that point in time. Usually, the spikes can be ignored, unless there are a lot of large spikes in one small amount of time.
How best to fill a vector of vectors (avoiding wasting memory and unnecessary allocations & de-allocations)?

How best to fill a vector of vectors (avoiding wasting memory and unnecessary allocations & de-allocations)?


By : BleepBloop
Date : March 29 2020, 07:55 AM
I hope this helps .
Q1 Will the copy (made inside push_back) have capacity() == size() (what I want), or preserve whatever tmp had, or is this implementation dependent / undefined?
code :
std::vector<std::vector<big_data_type> > table;
for(auto i=0; i!=4242; ++i) {
  std::vector<big_data_type> tmp = make_vector(i); // copy elison
  tmp.shrink_to_fit();                             // shrink
  table.push_back(std::move(tmp));                 // move
}
std::vector<std::vector<big_data_type> > table;
table.reserve(N);
std::vector<big_data_type> tmp;
for(auto i=0; i!=N; ++i) {
  tmp = make_vector(i); // #1
  table.push_back(tmp); // #2
}
// #3
std::vector<std::vector<big_data_type> > table;
table.reserve(N);
for(auto i=0; i!=N; ++i) {
  auto tmp = make_vector(i);          // #1
  tmp.shrink_to_fit();                // #2
  table.emplace_back(std::move(tmp)); // #3
}
Do compilers read the code and optimize the random memory allocations?

Do compilers read the code and optimize the random memory allocations?


By : Jish Newham
Date : March 29 2020, 07:55 AM
wish help you to fix your issue If you're compiling with anything except -O0 or its equivalent - i.e. "no optimizations" - the compiler may very well be rewriting your code as:
code :
register DLINKED_LIST_NODE curr = dlinked_list_goto_idx(list, idx, false);
register DLINKED_LIST_NODE removed = curr->next;

if(removed == 0) {
    printf("Error @ dlinked_list_remove: No such index.\n");
    exit(1);
}
How do I find all memory allocations in an llvm ir code file?

How do I find all memory allocations in an llvm ir code file?


By : userCCB
Date : March 29 2020, 07:55 AM
This might help you You're seeing the C++ mangled name of the operator. Demangle the symbol using abi::__cxa_demangle, or build up a table of mangled symbols. The new/delete operators may be overloaded so the symbols are not constant. Demangling may be the safest option.
This is the function piped through c++filt, which in turn uses abi::__cxa_demangle:
Track allocations/memory usage and also step through code in XCode?

Track allocations/memory usage and also step through code in XCode?


By : user4522046
Date : March 29 2020, 07:55 AM
wish of those help To track allocations in a certain period of time, what I normally do is mark the start and end points in the timeline using the inspection range buttons:
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