[jira] [Created] (ARROW-16717) [C++] Enable Arrow to share an application's jemalloc instance

["Ian Cook (Jira)" <ji...@apache.org>]

Ian Cook created ARROW-16717:
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             Summary: [C++] Enable Arrow to share an application's jemalloc instance
                 Key: ARROW-16717
                 URL: https://issues.apache.org/jira/browse/ARROW-16717
             Project: Apache Arrow
          Issue Type: New Feature
          Components: C++
    Affects Versions: 8.0.0
            Reporter: Ian Cook


Is there any good way for an application that uses Arrow to tell Arrow to share its own jemalloc instance?

Normally when Arrow uses jemalloc, it creates its own instance of it. The only method that I think would work to get Arrow to use the same jemalloc instance as the application would be to do something hacky like this:

 * Patch {{cpp/src/arrow/memory_pool.cc}} to use the application's jemalloc header
 * Configure the application's jemalloc instance to use the same configuration that Arrow uses, as shown in {{je_arrow_malloc_conf}}
 * Patch {{ThirdpartyToolchain.cmake}} to use the application's jemalloc instance

Is there any non-hacky way to achieve this? If not, would it be possible to add a feature to Arrow to enable the user to tell it to use a specific jemalloc instance at runtime?

The benefit of this would be that a unified jemalloc instance could (at least hypothetically) allocate memory more efficiently than two separate ones running on the same machine.



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