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Simulation on Palladium and FPGA #436

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changekkk opened this issue Aug 9, 2024 · 10 comments · May be fixed by #453
Open

Simulation on Palladium and FPGA #436

changekkk opened this issue Aug 9, 2024 · 10 comments · May be fixed by #453
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@changekkk
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你好,关于仿真加速器和FPGA环境上的difftest目前已经开发完毕了吗?是否有开源可用的环境

@klin02
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klin02 commented Aug 10, 2024

目前已经实现的仿真加速功能已经全部开源至本仓库,支持单核/双核加速,并已经在仿真加速器帕拉丁上进行使用。FPGA及进一步加速功能仍在开发当中。

At present, all realized simulation acceleration features have been open source in this repo, supporting single-core/dual-core Verification. Difftest have been used on the emulator Palladium.

Difftest on FPGA and further acceleration features are still WIP.

@changekkk
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你好,这里提到已实现的加速功能对应的的difftest版本是哪一个

@klin02
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klin02 commented Aug 11, 2024

已经实现的加速功能都已经合入 master 分支,通过 chisel 生成 verilog 时传入对应的 difftest-config 开启。当前支持的加速功能包含非阻塞传输及比对、数据语义压缩及 DPIC 函数合并传输等。

All implemented acceleration features have been merged into master branch, which can be turned on by passing the corresponding difftest-config when chisel generates verilog. Currently supported acceleration features include non-blocking transfer and compare, data semantic squash, and DPIC function batching.

@changekkk
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你好,想问一下,前面提到的在帕拉丁使用的difftest版本,与FPGA及进一步加速功能是一类的吗,帕拉丁本身也是FPGA设备,对于difftest来说,在帕拉丁跑和FPGA上跑是不同版本吗?

@klin02
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klin02 commented Aug 15, 2024

目前的加速功能硬件实现部分是通用的,主要在通信方式有所区别。帕拉丁支持直接使用 DPIC 函数、软硬件协同仿真。FPGA 预计将使用 PCIe 进行实现,相关适配尚未完成。

@changekkk
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好的,咱们Difftest在FPGA上使用的话,主要是如何跟fpga flow配合调试的?在FPGA上跑设计代码,然后同步difftest运行nemu来比对吗

@klin02
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klin02 commented Aug 17, 2024

FPGA流程与仿真加速器类似,Difftest 将负责:硬件侧从待测设计提取信号,通过PCIe进行传输;软件侧接收数据并处理,驱动nemu进行比对

@changekkk
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这里FPGA流程预计会比仿真加速器快多少,另外FPGA流程的话,是FPGA运行DUT,然后Difftest主要来提取运行结果并通过PCIe来驱动nemu比对吗?

@klin02
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klin02 commented Aug 18, 2024

整体流程基本上是这样的。目前 FPGA 流程尚未跑通,尚无准确的数据,根据部分相关工作的速度数据及数据量对比,预估速度会达到数至数十 MCycle/s。

@changekkk
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好的,谢谢

@poemonsense poemonsense changed the title 仿真加速 Simulation on Palladium and FPGA Aug 28, 2024
@xiaokamikami xiaokamikami linked a pull request Aug 29, 2024 that will close this issue
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