mirror of https://github.com/ollama/ollama.git
65 lines
2.0 KiB
Go
65 lines
2.0 KiB
Go
//go:build linux || windows
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package discover
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import (
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"fmt"
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"log/slog"
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"os"
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"regexp"
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"runtime"
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"strconv"
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"strings"
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)
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// Jetson devices have JETSON_JETPACK="x.y.z" factory set to the Jetpack version installed.
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// Included to drive logic for reducing Ollama-allocated overhead on L4T/Jetson devices.
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var CudaTegra string = os.Getenv("JETSON_JETPACK")
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func cudaVariant(gpuInfos []CudaGPUInfo) string {
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if runtime.GOARCH == "arm64" && runtime.GOOS == "linux" {
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if CudaTegra != "" {
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ver := strings.Split(CudaTegra, ".")
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if len(ver) > 0 {
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return "jetpack" + ver[0]
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}
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} else if data, err := os.ReadFile("/etc/nv_tegra_release"); err == nil {
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r := regexp.MustCompile(` R(\d+) `)
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m := r.FindSubmatch(data)
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if len(m) != 2 {
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slog.Info("Unexpected format for /etc/nv_tegra_release. Set JETSON_JETPACK to select version")
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} else {
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if l4t, err := strconv.Atoi(string(m[1])); err == nil {
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// Note: mapping from L4t -> JP is inconsistent (can't just subtract 30)
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// https://developer.nvidia.com/embedded/jetpack-archive
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switch l4t {
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case 35:
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return "jetpack5"
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case 36:
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return "jetpack6"
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default:
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slog.Info("unsupported L4T version", "nv_tegra_release", string(data))
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}
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}
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}
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}
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}
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// Check GPU compute capability FIRST, lowest common denominator if multi-gpu
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for _, gpuInfo := range gpuInfos {
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if gpuInfo.computeMajor < 7 || (gpuInfo.computeMajor == 7 && gpuInfo.computeMinor < 5) {
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// GPU is Pascal or older (CC <= 7.4) - use CUDA v12 (supports CC 6.1)
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return "v12"
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}
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}
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// GPU is Turing or newer (CC >= 7.5) - can use newer CUDA
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if len(gpuInfos) > 0 && gpuInfos[0].DriverMajor < 13 {
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// The detected driver is older than 580 (Aug 2025)
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// Warn if their CC is compatible with v13 and they should upgrade their driver to get better performance
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slog.Warn("old CUDA driver detected - please upgrade to a newer driver for best performance", "version", fmt.Sprintf("%d.%d", gpuInfos[0].DriverMajor, gpuInfos[0].DriverMinor))
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return "v12"
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}
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return "v13"
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}
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