Istvan Kiss
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39 regels
1.6 KiB
Markdown
39 regels
1.6 KiB
Markdown
# Table Comparing Syntax for Different Compute APIs
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|Term|CUDA|HIP|OpenCL|
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|Device|`int deviceId`|`int deviceId`|`cl_device`|
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|Queue|`cudaStream_t`|`hipStream_t`|`cl_command_queue`|
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|Event|`cudaEvent_t`|`hipEvent_t`|`cl_event`|
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|Memory|`void *`|`void *`|`cl_mem`|
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| |grid|grid|NDRange|
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| |block|block|work-group|
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| |thread|thread|work-item|
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| |warp|warp|sub-group|
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|Thread-<br>index | `threadIdx.x` | `threadIdx.x` | `get_local_id(0)` |
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|Block-<br>index | `blockIdx.x` | `blockIdx.x` | `get_group_id(0)` |
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|Block-<br>dim | `blockDim.x` | `blockDim.x` | `get_local_size(0)` |
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|Grid-dim | `gridDim.x` | `gridDim.x` | `get_num_groups(0)` |
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|Device Kernel|`__global__`|`__global__`|`__kernel`|
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|Device Function|`__device__`|`__device__`|Implied in device compilation|
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|Host Function|`__host_` (default)|`__host_` (default)|Implied in host compilation|
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|Host + Device Function|`__host__` `__device__`|`__host__` `__device__`| No equivalent|
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|Kernel Launch|`<<< >>>`|`hipLaunchKernel`/`hipLaunchKernelGGL`/`<<< >>>`|`clEnqueueNDRangeKernel`|
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|Global Memory|`__global__`|`__global__`|`__global`|
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|Group Memory|`__shared__`|`__shared__`|`__local`|
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|Constant|`__constant__`|`__constant__`|`__constant`|
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||`__syncthreads`|`__syncthreads`|`barrier(CLK_LOCAL_MEMFENCE)`|
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|Atomic Builtins|`atomicAdd`|`atomicAdd`|`atomic_add`|
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|Precise Math|`cos(f)`|`cos(f)`|`cos(f)`|
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|Fast Math|`__cos(f)`|`__cos(f)`|`native_cos(f)`|
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|Vector|`float4`|`float4`|`float4`|
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## Notes
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The indexing functions (starting with `thread-index`) show the terminology for a 1D grid. Some APIs use reverse order of `xyz` / 012 indexing for 3D grids.
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