MemoryPool | An easy to use and efficient memory pool allocator | Machine Learning library

I did the following change and the issue is solved:

When I compile your code with Visual C++ 2019, I get this error:

error C2440: '-': cannot convert from 'unsigned char *' to 'char *'

If I change your code to cast to unsigned char* as per the error message, then it compiles:

auto pos = ((unsigned char*)data - memoryPool.get()) / blockSize;

Whether that does what you intend - well, it appears to, but you haven't clearly specified what getPosition does, so I can only guess.

Please post the error message in the future, not just say it doesn't work! It'll help us help you.

Maciej, the method TableReader::Read should return shared_ptr. The arrow::Table itself has a number of shared pointers to structures which eventually contain the data. To free up the data you will need to make sure that the arrow::Table and any copies of it are destroyed. This should happen as soon as that shared_ptr goes out of scope. However, it appears you are storing the table in a member variable here (which is to be expected, you probably want to use the data after you read it):

Added consumer property props.put("security.protocol", "SSL"); Worked

From a now moderator deleted answer, this appears to be a bug in CuPy. A developer has raised a ticket on the github site, and a patch has been proposed (as at 2020-9-22).

In the short term, you will have to accept this as a problem and wait until a fix appears in a future release. If this is critical, then consider pulling the current development branch from github and building your own package. There is no user code workaround which can solve this.

The troubleshooting documents [1] could be helpful to determine what points need to be transformed, as well as to ensure your transformations behave as expected.

[1] https://cloud.google.com/monitoring/agent/custom-metrics-agent#troubleshooting

Finally, it was solved by using UE4 plugin from this example. It is not the solution I wanted but at least it works. There are statically linked libraries and hardcoded compiler version which may bring problems in the future.

The ArrayPool class rents out Arrays. In otherwords the Rent method returns a T[]. The Shared property returns a default implementation of an ArrayPool, TlsOverPerCoreLockedStacksArrayPool which caches the backing arrays in a combination of a ThreadStatic array of buckets and local per-core "stacks". It is optimized for the char and byte cases. The ConfigurableArrayPool returned from the Create method stores the underlying arrays in an array of Buckets (each with its own array of arrays). Additionally you may write your own implementation.

On the other hand, MemoryPool is a bit more generic in that it deals ultimately with Memory objects. The Rent method hands out IMemoryOwner implementations, which are responsible for, well, owning a Memory. Memory Owners can be backed by various sources, arrays being one of them. The MemoryPool.Shared singleton is actually an ArrayMemoryPool which is backed by, you guessed it, ArrayPool.Shared. But memory pools may be backed by different sources, for example by unmanaged memory/memory pointed to by a SafeHandle.

Which one to use really depends on your requirements:

• If the API you are using requires a T[] or you simply want a no-allocation array, then ArrayPool is what you want to use.

• If you are working with Memory instances, then you want to use a MemoryPool

If you are using an API that can take either, there's not necessarily a benefit to using one pool over the other. The API itself may work better with raw T[] than it does with Memory (or vice versa), but the API should only care about the memory itself and has no knowledge of the pool from which it came.

One error is that your create function fails to return a value when it should return a T*. Thus undefined behavior is invoked.