<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div class=""><br class=""></div> Junchao,<div class=""><br class=""></div><div class=""> I hope my latest MRs manages that for the current generation of those values. If not, we need refinement.</div><div class=""><br class=""></div><div class=""> Barry</div><div class=""><br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Apr 5, 2021, at 9:30 PM, Junchao Zhang <<a href="mailto:junchao.zhang@gmail.com" class="">junchao.zhang@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class=""><div dir="ltr" class=""><br class=""><br class=""></div><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Apr 5, 2021 at 7:33 PM Jeff Hammond <<a href="mailto:jeff.science@gmail.com" class="">jeff.science@gmail.com</a>> wrote:<br class=""></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr" class="">NVCC has supported multi-versioned "fat" binaries since I worked for Argonne. Libraries should figure out what the oldest hardware they are about is and then compile for everything from that point forward. Kepler (3.5) is oldest version any reasonable person should be thinking about at this point. The oldest thing I know of in the DOE HPC fleet is Pascal (6.x). Volta and Turing are 7.x and Ampere is 8.x.<div class=""><br class=""></div><div class="">The biggest architectural changes came with unified memory (<a href="https://developer.nvidia.com/blog/unified-memory-in-cuda-6/" target="_blank" class="">https://developer.nvidia.com/blog/unified-memory-in-cuda-6/</a>) and cooperative (<a href="https://developer.nvidia.com/blog/cooperative-groups/" target="_blank" class="">https://developer.nvidia.com/blog/cooperative-groups/</a> in CUDA 9) but Kokkos doesn't use the latter. Both features can be used on quite old GPU architectures, although the performance is better on newer ones.<div class=""><br class=""></div><div class="">I haven't dug into what Kokkos and PETSc are doing but the direct use of this stuff in CUDA is well-documented, certainly as well as the CPU switches for x86 binaries in the Intel compiler are.<br class=""><div class=""><br class=""></div><div class=""><a href="https://docs.nvidia.com/cuda/cuda-c-programming-guide/index.html#compute-capabilities" target="_blank" class="">https://docs.nvidia.com/cuda/cuda-c-programming-guide/index.html#compute-capabilities</a><br class=""></div><div class=""><br class=""></div><div class=""><span style="font-family: "Trebuchet MS", "DIN Pro", sans-serif; font-size: 14px;" class="">Devices with the same major revision number are of the same core architecture. The major revision number is 8 for devices based on the </span><dfn style="font-family: "Trebuchet MS", "DIN Pro", sans-serif; font-size: 14px;" class="">NVIDIA Ampere GPU</dfn><span style="font-family: "Trebuchet MS", "DIN Pro", sans-serif; font-size: 14px;" class=""> architecture, 7 for devices based on the </span><dfn style="font-family: "Trebuchet MS", "DIN Pro", sans-serif; font-size: 14px;" class="">Volta</dfn><span style="font-family: "Trebuchet MS", "DIN Pro", sans-serif; font-size: 14px;" class=""> architecture, 6 for devices based on the </span><dfn style="font-family: "Trebuchet MS", "DIN Pro", sans-serif; font-size: 14px;" class="">Pascal</dfn><span style="font-family: "Trebuchet MS", "DIN Pro", sans-serif; font-size: 14px;" class=""> architecture, 5 for devices based on the </span><dfn style="font-family: "Trebuchet MS", "DIN Pro", sans-serif; font-size: 14px;" class="">Maxwell</dfn><span style="font-family: "Trebuchet MS", "DIN Pro", sans-serif; font-size: 14px;" class=""> architecture, 3 for devices based on the </span><dfn style="font-family: "Trebuchet MS", "DIN Pro", sans-serif; font-size: 14px;" class="">Kepler</dfn><span style="font-family: "Trebuchet MS", "DIN Pro", sans-serif; font-size: 14px;" class=""> architecture, 2 for devices based on the </span><dfn style="font-family: "Trebuchet MS", "DIN Pro", sans-serif; font-size: 14px;" class="">Fermi</dfn><span style="font-family: "Trebuchet MS", "DIN Pro", sans-serif; font-size: 14px;" class=""> architecture, and 1 for devices based on the </span><dfn style="font-family: "Trebuchet MS", "DIN Pro", sans-serif; font-size: 14px;" class="">Tesla</dfn><span style="font-family: "Trebuchet MS", "DIN Pro", sans-serif; font-size: 14px;" class=""> architecture.</span></div></div></div></div></blockquote>Kokkos has config options Kokkos_ARCH_TURING75, Kokkos_ARCH_VOLTA70, Kokkos_ARCH_VOLTA72. Any idea how one can map compute capability versions to arch names?<div class=""> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr" class=""><div class=""><div class=""><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><a href="https://docs.nvidia.com/cuda/pascal-compatibility-guide/index.html#building-pascal-compatible-apps-using-cuda-8-0" target="_blank" class="">https://docs.nvidia.com/cuda/pascal-compatibility-guide/index.html#building-pascal-compatible-apps-using-cuda-8-0</a><br class=""></div><div class=""><a href="https://docs.nvidia.com/cuda/volta-compatibility-guide/index.html#building-volta-compatible-apps-using-cuda-9-0" target="_blank" class="">https://docs.nvidia.com/cuda/volta-compatibility-guide/index.html#building-volta-compatible-apps-using-cuda-9-0</a><br class=""></div><div class=""><a href="https://docs.nvidia.com/cuda/turing-compatibility-guide/index.html#building-turing-compatible-apps-using-cuda-10-0" target="_blank" class="">https://docs.nvidia.com/cuda/turing-compatibility-guide/index.html#building-turing-compatible-apps-using-cuda-10-0</a><br class=""></div><div class=""><a href="https://docs.nvidia.com/cuda/ampere-compatibility-guide/index.html#building-ampere-compatible-apps-using-cuda-11-0" target="_blank" class="">https://docs.nvidia.com/cuda/ampere-compatibility-guide/index.html#building-ampere-compatible-apps-using-cuda-11-0</a><br class=""></div><div class=""><br class=""></div><div class="">Programmatic querying can be done with the following (<a href="https://docs.nvidia.com/cuda/cuda-runtime-api/group__CUDART__DEVICE.html" target="_blank" class="">https://docs.nvidia.com/cuda/cuda-runtime-api/group__CUDART__DEVICE.html</a>):</div><div class=""><br class=""></div><div class=""><span style="font-family: "Trebuchet MS", "DIN Pro", sans-serif; font-size: 14px; background-color: rgb(239, 239, 240);" class="">cudaDeviceGetAttribute</span><br class=""></div><div class=""><ul style="font-family: "Trebuchet MS", "DIN Pro", sans-serif; font-size: 14px;" class=""><li class=""><div style="margin: 0px;" class=""><a href="https://docs.nvidia.com/cuda/cuda-runtime-api/group__CUDART__TYPES.html#group__CUDART__TYPES_1gg49e2f8c2c0bd6fe264f2fc970912e5cd220ff111a6616ab512e229d8f2f8bf87" shape="rect" style="color:rgb(118,185,0)" target="_blank" class="">cudaDevAttrComputeCapabilityMajor</a>: Major compute capability version number;</div></li><li class=""><div style="margin: 0px;" class=""><a href="https://docs.nvidia.com/cuda/cuda-runtime-api/group__CUDART__TYPES.html#group__CUDART__TYPES_1gg49e2f8c2c0bd6fe264f2fc970912e5cd2c981c76c9de58d39502e483a7b484c7" shape="rect" style="color:rgb(118,185,0)" target="_blank" class="">cudaDevAttrComputeCapabilityMinor</a>: Minor compute capability version number;</div></li></ul></div><div class="">The compiler help tells me this, which can be cross-referenced with CUDA documentation above.</div><div class=""><br class=""></div><div class=""><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class="">$ /usr/local/cuda-10.0/bin/nvcc -h</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0); min-height: 17px;" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""></span><br class=""></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class="">Usage<span class=""> </span>: nvcc [options] <inputfile></span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><br class=""></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class="">...</div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><br class=""></div></div><div class=""><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class="">Options for steering GPU code generation.</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class="">=========================================</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0); min-height: 17px;" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""></span><br class=""></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class="">--gpu-architecture <arch><span class=""> </span>(-arch)<span class=""> </span></span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span>Specify the name of the class of NVIDIA 'virtual' GPU architecture for which</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span>the CUDA input files must be compiled.</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span>With the exception as described for the shorthand below, the architecture</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span>specified with this option must be a 'virtual' architecture (such as compute_50).</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span>Normally, this option alone does not trigger assembly of the generated PTX</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span>for a 'real' architecture (that is the role of nvcc option '--gpu-code',</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span>see below); rather, its purpose is to control preprocessing and compilation</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span>of the input to PTX.</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span>For convenience, in case of simple nvcc compilations, the following shorthand</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span>is supported.<span class=""> </span>If no value for option '--gpu-code' is specified, then the</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span>value of this option defaults to the value of '--gpu-architecture'.<span class=""> </span>In this</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span>situation, as only exception to the description above, the value specified</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span>for '--gpu-architecture' may be a 'real' architecture (such as a sm_50),</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span>in which case nvcc uses the specified 'real' architecture and its closest</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span>'virtual' architecture as effective architecture values.<span class=""> </span>For example, 'nvcc</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span>--gpu-architecture=sm_50' is equivalent to 'nvcc --gpu-architecture=compute_50</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span>--gpu-code=sm_50,compute_50'.</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span>Allowed values for this option:<span class=""> </span>'compute_30','compute_32','compute_35',</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span>'compute_37','compute_50','compute_52','compute_53','compute_60','compute_61',</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span>'compute_62','compute_70','compute_72','compute_75','sm_30','sm_32','sm_35',</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span>'sm_37','sm_50','sm_52','sm_53','sm_60','sm_61','sm_62','sm_70','sm_72',</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span>'sm_75'.</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0); min-height: 17px;" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""></span><br class=""></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class="">--gpu-code <code>,...<span class=""> </span>(-code)<span class=""> </span></span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span>Specify the name of the NVIDIA GPU to assemble and optimize PTX for.</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span>nvcc embeds a compiled code image in the resulting executable for each specified</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span><code> architecture, which is a true binary load image for each 'real' architecture</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span>(such as sm_50), and PTX code for the 'virtual' architecture (such as compute_50).</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span>During runtime, such embedded PTX code is dynamically compiled by the CUDA</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span>runtime system if no binary load image is found for the 'current' GPU.</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span>Architectures specified for options '--gpu-architecture' and '--gpu-code'</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span>may be 'virtual' as well as 'real', but the <code> architectures must be</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span>compatible with the <arch> architecture.<span class=""> </span>When the '--gpu-code' option is</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span>used, the value for the '--gpu-architecture' option must be a 'virtual' PTX</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span>architecture.</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span>For instance, '--gpu-architecture=compute_35' is not compatible with '--gpu-code=sm_30',</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span>because the earlier compilation stages will assume the availability of 'compute_35'</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span>features that are not present on 'sm_30'.</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span>Allowed values for this option:<span class=""> </span>'compute_30','compute_32','compute_35',</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span>'compute_37','compute_50','compute_52','compute_53','compute_60','compute_61',</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span>'compute_62','compute_70','compute_72','compute_75','sm_30','sm_32','sm_35',</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span>'sm_37','sm_50','sm_52','sm_53','sm_60','sm_61','sm_62','sm_70','sm_72',</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span>'sm_75'.</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0); min-height: 17px;" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""></span><br class=""></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class="">--generate-code <specification>,...<span class=""> </span>(-gencode) <span class=""> </span></span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span>This option provides a generalization of the '--gpu-architecture=<arch> --gpu-code=<code>,</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span>...' option combination for specifying nvcc behavior with respect to code</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span>generation.<span class=""> </span>Where use of the previous options generates code for different</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span>'real' architectures with the PTX for the same 'virtual' architecture, option</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span>'--generate-code' allows multiple PTX generations for different 'virtual'</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span>architectures.<span class=""> </span>In fact, '--gpu-architecture=<arch> --gpu-code=<code>,</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span>...' is equivalent to '--generate-code arch=<arch>,code=<code>,...'.</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span>'--generate-code' options may be repeated for different virtual architectures.</span></div><div style="margin: 0px; font-variant-numeric: normal; font-variant-east-asian: normal; font-stretch: normal; font-size: 13px; line-height: normal; font-family: Monaco; color: rgb(242, 242, 242); background-color: rgb(0, 0, 0);" class=""><span style="font-variant-ligatures:no-common-ligatures" class=""><span class=""> </span>Allowed keywords for this option:<span class=""> </span>'arch','code'.</span></div></div></div></div></div><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Apr 5, 2021 at 1:19 PM Satish Balay via petsc-dev <<a href="mailto:petsc-dev@mcs.anl.gov" target="_blank" class="">petsc-dev@mcs.anl.gov</a>> wrote:<br class=""></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">This is nvidia mess-up. Why isn't there a command that give me these values [if they insist on this interface for nvcc]<br class="">
<br class="">
I see Barry want configure to do something here - but whatever we do - we would be shifting the problem around.<br class="">
[even if we detect stuff - build box might not have the GPU used for runs.]<br class="">
<br class="">
We have --with-cuda-arch - which I tried to remove from configure - but its come back in a different form (--with-cuda-gencodearch)<br class="">
<br class="">
And I see other packages:<br class="">
<br class="">
--with-kokkos-cuda-arch<br class="">
<br class="">
Wrt spack - I'm having to do:<br class="">
<br class="">
spack install xsdk+cuda ^magma cuda_arch=60<br class="">
<br class="">
[magma uses CudaPackage() infrastructure in spack]<br class="">
<br class="">
Satish<br class="">
<br class="">
On Mon, 5 Apr 2021, Mills, Richard Tran via petsc-dev wrote:<br class="">
<br class="">
> You raise a good point, Barry. I've been completely mystified by what some of these names even mean. What does "PASCAL60" vs. "PASCAL61" even mean? Do you know of where this is even documented? I can't really find anything about it in the Kokkos documentation. The only thing I can really find is an issue or two about "hey, shouldn't our CMake stuff figure this out automatically" and then some posts about why it can't really do that. Not encouraging.<br class="">
> <br class="">
> --Richard<br class="">
> <br class="">
> On 4/3/21 8:42 PM, Barry Smith wrote:<br class="">
> <br class="">
> <br class="">
> It would be very nice to NOT require PETSc users to provide this flag, how the heck will they know what it should be when we cannot automate it ourselves?<br class="">
> <br class="">
> Any ideas of how this can be determined based on the current system? NVIDIA does not help since these "advertising" names don't seem to trivially map to information you can get from a particular GPU when you logged into it. For example nvidia-smi doesn't use these names directly. Is there some mapping from nvidia-smi to these names we could use? If we are serious about having a non-trivial number of users utilizing GPUs, which we need to be for future, we cannot have this absurd demands in our installation process.<br class="">
> <br class="">
> Barry<br class="">
> <br class="">
> Does spack have some magic for this we could use?<br class="">
> <br class="">
> <br class="">
> <br class="">
> <br class="">
<br class="">
</blockquote></div><br clear="all" class=""><div class=""><br class=""></div>-- <br class=""><div dir="ltr" class="">Jeff Hammond<br class=""><a href="mailto:jeff.science@gmail.com" target="_blank" class="">jeff.science@gmail.com</a><br class=""><a href="http://jeffhammond.github.io/" target="_blank" class="">http://jeffhammond.github.io/</a></div>
</blockquote></div></div>
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