170hx（any cmp hx card）can run higher and higher fp32 flops than before

[jetcat8848]

i tried mod a OpenCL benchmark（disable fma to prevent GPU use it，the code like this：

diff --git a/src/lbm.cpp b/src/lbm.cpp index d99202f..28aeb25 100644 --- a/src/lbm.cpp +++ b/src/lbm.cpp @@ -286,6 +286,8 @@ void LBM_Domain::enqueue_unvoxelize_mesh_on_device(const Mesh* mesh, const uchar }

string LBM_Domain::device_defines() const { return

"\n #pragma OPENCL FP_CONTRACT OFF" // prevents implicit FMA optimizations "\n #define fma(a, b, c) ((a) * (b) + (c))" // shadows OpenCL explicit function fma() "\n #define def_Nx "+to_string(Nx)+"u" "\n #define def_Ny "+to_string(Ny)+"u" "\n #define def_Nz "+to_string(Nz)+"u" OK，the moded OpenCL benchmark runs，and the 170hx fp32 flops increased to 6.285 Tflops，the original fp32 flops just only 0.395Tflops，6.285/0.395=16，so，i think the nvidia driver prevented gpu use full speed on FMA！

[jetcat8848]

10DE 20C2 the devicr ID is a CMP170HX mining card，i installed a nvidia gird A100-20C driver to run it！ ![Uploading D4C351D7-32C8-4685-A388-E3D177234F02.jpeg…]()

[jetcat8848]

[bah86]

Do you have any idea how to disable fma in the driver?

[astronautduckpc]

Is this the same problem that the cmp70hx and cmp90hx have reduced performance? Described here in open sources

[jetcat8848]

您知道如何在驱动程序中禁用 fma 吗？

sorry!i have no idea....

[jetcat8848]

这与 cmp70hx 和 cmp90hx 性能下降的问题相同吗？此处在开源中进行了描述

yes!it is the same!nvidia use efuse to tag fma speed (reduce to: 1/8,1/16,1/32...1/2^n,n=1,2...5),and the nv driver knows how to running!

[astronautduckpc]

这与 cmp70hx и cmp90hx.

да! это то же самое! NVIDIA использует efuse для обозначения скорости fma (уменьшите до: 1/8,1/16,1/32...1/2^n,n=1,2...5), и драйвер nv знает, как работать!

and how to fix or work around this?)

[Skylord4321]

this is incredible information! so they used Efuse within the driver to hinder the mining card performance!