[jira] [Updated] (IGNITE-1963) CPP: Optimize interop memory

["Vladimir Ozerov (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IGNITE-1963?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Vladimir Ozerov updated IGNITE-1963:
------------------------------------
    Labels: cpp performance  (was: )

> CPP: Optimize interop memory
> ----------------------------
>
>                 Key: IGNITE-1963
>                 URL: https://issues.apache.org/jira/browse/IGNITE-1963
>             Project: Ignite
>          Issue Type: Task
>          Components: platforms
>    Affects Versions: ignite-1.4
>            Reporter: Igor Sapego
>            Priority: Minor
>              Labels: cpp, performance
>
> Current design of the {{InteropMemory}} class got some unavoidable overheads and makes it difficult to implement adapter-like subclasses.
> 1. Considering that {{InteropMemory}} is the only class that can be used with binary streams and binary readers/writers, it should have design that allows writing adapter subclasses. For example, it could be std::vector class adapter or stack-allocated array.
> 2. Current {{InteropUnpooledMemory}} implementation makes two heap memory allocations during instance construction. It's a big overhead considering that {{InteropUnpooledMemory}} instances construction happens often.
> 3. Consider replacing this class with two classes: read/write memory and read only memory. It makes sense because Input streams do not modify memory they operate on. That would allow us to implement reading in a more efficient way because we wont be needing to implement {{Reallocate()}} method anymore.



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