[jira] [Commented] (ARROW-5924) [C++][Plasma] It is not convenient to release a GPU object

["Krisztian Szucs (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-5924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16886098#comment-16886098 ] 

Krisztian Szucs commented on ARROW-5924:
----------------------------------------

[~wesmckinn] may we postpone it to 1.0.0?

> [C++][Plasma] It is not convenient to release a GPU object
> ----------------------------------------------------------
>
>                 Key: ARROW-5924
>                 URL: https://issues.apache.org/jira/browse/ARROW-5924
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++ - Plasma
>    Affects Versions: 0.14.0
>            Reporter: shengjun.li
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 0.14.1
>
>          Time Spent: 2h 50m
>  Remaining Estimate: 0h
>
> cmake_modules/DefineOptions.cmake
>    define_option(ARROW_CUDA "Build the Arrow CUDA extensions (requires CUDA toolkit)" ON)
>    define_option(ARROW_PLASMA "Build the plasma object store along with Arrow" ON)
> The corrent sequence is as follow:
>  (1) plasma_client.Create(object_id, size, nullptr, 0, &buff, 1);  // where device_num > 0
>  (2) plasma_client.Seal(object_id);
>  (3) buff = nullptr;
>  (4) plasma_client.Release(object_id);
>  (5) plasma_client.Delete(object_id);
> To set buff nullptr (step 3) just before release the object (step 4) because CloseIpcBuffer is in its destructor (class CudaBuffer).
> If a user does not do that promptly, CloseIpcBuffer will be blocked.
> Then, the following error may occure when another object created.
>      IOError: Cuda Driver API call in /home/zilliz/arrow/cpp/src/arrow/gpu/cuda_context.cc at line 156 failed with code 208: cuIpcOpenMemHandle(&data, *handle, CU_IPC_MEM_LAZY_ENABLE_PEER_ACCESS) (nil)



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