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"""Rasteration Plan For L2 Cache Locality""" |
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from typing import List |
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class Rasterization: |
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panel_width_ = None |
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def __init__(self) -> None: |
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pass |
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def get_code(self) -> List[str]: |
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raise NotImplementedError() |
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@property |
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def panel_width(self): |
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assert self.panel_width_ is not None |
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return self.panel_width_ |
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class NoRasterization(Rasterization): |
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def __init__(self) -> None: |
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super().__init__() |
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def __repr__(self) -> str: |
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return "<NoRasterization>" |
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def get_code(self) -> List[str]: |
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return [] |
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class Rasterization2DRow(Rasterization): |
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""" |
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Rasterization by Row, each Row line width is panel_width |
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_________ |
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_________| |
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|_________ |
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__________| |
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""" |
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def __init__(self, panel_width=4) -> None: |
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super().__init__() |
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self.panel_width_ = panel_width |
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def __repr__(self) -> str: |
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return f"<Rasterization2DRow({self.panel_width_})>" |
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def get_code(self) -> List[str]: |
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raise NotImplementedError() |
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class Rasterization2DColumn(Rasterization): |
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""" |
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Rasterization by Column, each column line width is panel_width |
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_ |
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| | | | |
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""" |
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def __init__(self, panel_width=4) -> None: |
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super().__init__() |
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self.panel_width_ = panel_width |
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def __repr__(self) -> str: |
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return f"<Rasterization2DColumn({self.panel_width_})>" |
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def get_device_function(self) -> str: |
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return """ |
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__device__ __inline__ dim3 rasterization2DColumn(const int panel_width) { |
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const auto baseBlockIdx = blockIdx.x + gridDim.x *blockIdx.y; |
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const auto totalPanel = (gridDim.x * gridDim.y +panel_width * gridDim.x - 1) / (panel_width * gridDim.x); |
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const auto totalBlock = gridDim.x * gridDim.y; |
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const auto panelIdx = baseBlockIdx / (panel_width *gridDim.x); |
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const auto strideLd = panelIdx + 1 < totalPanel ?panel_width : (totalBlock - panelIdx * (panel_width *gridDim.x)) / gridDim.x; |
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const auto bx = (panelIdx & 1) ? gridDim.x -(baseBlockIdx - panelIdx * panel_width * gridDim.x) /strideLd - 1 : (baseBlockIdx - panelIdx * panel_width *gridDim.x) / strideLd; |
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const auto by = (baseBlockIdx - panelIdx * panel_width *gridDim.x) % strideLd + panelIdx * panel_width; |
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const auto bz = blockIdx.z; |
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dim3 blockIdx(bx, by, bz); |
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return blockIdx; |
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} |
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""" |
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def get_code(self, panel_width: int = None) -> List[str]: |
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if panel_width is None: |
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panel_width = self.panel_width_ |
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return [ |
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self.get_device_function(), |
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"const dim3 blockIdx = rasterization2DColumn({});\n".format(panel_width), |
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] |
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