yugang-amd
99 wiersze
2.7 KiB
ReStructuredText
99 wiersze
2.7 KiB
ReStructuredText
.. meta::
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:description: rocSHMEM intra-kernel networking runtime for AMD dGPUs on the ROCm platform.
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:keywords: rocSHMEM, API, ROCm, documentation, HIP, Networking, Communication
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.. _rocshmem-api-init:
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---------------------------------------
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Library setup, exit, and query routines
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---------------------------------------
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ROCSHMEM_INIT
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-------------
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.. cpp:function:: __host__ void rocshmem_init(void)
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:Parameters: None.
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:returns: None.
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**Description:**
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This routine initializes the rocSHMEM runtime and underlying transport layer.
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Before ``rocshmem_init`` is called,
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you must select the device that this PE is associated to by calling
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`hipSetDevice
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<https://rocm.docs.amd.com/projects/HIP/en/docs-6.0.0/doxygen/html/group___device.html#ga43c1e7f15925eeb762195ccb5e063eae>`_.
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.. cpp:function:: __device__ void rocshmem_wg_init(void)
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:Parameters: None.
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:returns: None.
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**Description:**
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This routine initializes device-side rocSHMEM resources.
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It must be called before any threads in this work-group invoke other rocSHMEM functions.
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It must be called collectively by all threads in the work-group.
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ROCSHMEM_FINALIZE
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-----------------
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.. cpp:function:: __host__ void rocshmem_finalize(void)
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:Parameters: None.
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:returns: None.
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**Description:**
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This routine finalizes the rocSHMEM runtime.
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.. cpp:function:: __device__ void rocshmem_wg_finalize(void)
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:Parameters: None.
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:returns: None.
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**Description:**
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This routine finalizes device-side rocSHMEM resources.
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It must be called before work-group completion if the work-group also called ``rocshmem_wg_init``.
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It must be called collectively by all threads in the work-group.
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ROCSHMEM_N_PES
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--------------
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.. cpp:function:: __host__ int rocshmem_n_pes(void)
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:Parameters: None.
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:returns: Total number of PEs.
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**Description:**
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This routine queries the total number of PEs.
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It can be called before ``rocshmem_init``.
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.. cpp:function:: __device__ int rocshmem_n_pes(void)
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.. cpp:function:: __device__ int rocshmem_ctx_n_pes(rocshmem_ctx_t ctx)
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:param ctx: GPU side context handle.
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:returns: Total number of PEs.
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**Description:**
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This routine queries the total number of PEs for a given context.
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It can be called per thread with no performance penalty.
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ROCSHMEM_MY_PE
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--------------
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.. cpp:function:: __host__ int rocshmem_my_pe(void)
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:Parameters: None.
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:returns: PE ID of the caller.
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**Description:**
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This routine queries the PE ID of the caller.
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It can be called before ``rocshmem_init``.
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.. cpp:function:: __device__ int rocshmem_my_pe(void)
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.. cpp:function:: __device__ int rocshmem_ctx_my_pe(rocshmem_ctx_t ctx)
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:param ctx: GPU side context handle.
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:returns: PE ID of the caller.
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**Description:**
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This routine queries the PE ID of the caller.
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It can be called per thread with no performance penalty.
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