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Link libclublasLt and liblubas in the install lib directory. #64

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Merged
janpfeifer merged 1 commit into from
Nov 11, 2025
Merged

Link libclublasLt and liblubas in the install lib directory. #64

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14 changes: 14 additions & 0 deletions cmd/gopjrt_installer/cuda.go
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Original file line number Diff line number Diff line change
Expand Up @@ -223,6 +223,20 @@ func CudaInstallNvidiaLibraries(plugin, version, installPath string) error {
if err := os.Symlink(ptxasPath, ptxasLinkPath); err != nil {
return errors.Wrapf(err, "failed to create symbolic link to ptxas in %s", ptxasLinkPath)
}

// Link libraries that Nvidia is not able to find from the SDK path set.
switch plugin {
case "cuda13":
libsPath := filepath.Join(installPath, "lib")
libCublasPath := "./gomlx/nvidia/cu13/lib"
for _, srcName := range []string{"libcublasLt.so.13", "libcublas.so.13"} {
dstPath := filepath.Join(libsPath, filepath.Base(srcName))
srcPath := filepath.Join(libCublasPath, srcName)
if err := os.Symlink(srcPath, dstPath); err != nil {
return errors.Wrapf(err, "failed to create symbolic link to %s in %s", srcPath, dstPath)
}
}
}
return nil
}

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6 changes: 6 additions & 0 deletions docs/CHANGELOG.md
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@@ -1,5 +1,11 @@
# Gopjrt Changelog

# Next

- Package `cmd/gopjrt_installer`:
- Link `libcublasLt.so.13` and `libcublas.so.13` to the `lib` subdirectory of the install directory given.
Nvidia needs it for some models, but doesn't know how to find it within the provided SDK path.

# v0.9.1 2025/11/07: More multi-device support; updated CPU PJRT; dropped static CPU PJRT linking.

- Package `pjrt`:
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13 changes: 7 additions & 6 deletions pjrt/cuda_linux.go
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Original file line number Diff line number Diff line change
Expand Up @@ -107,12 +107,13 @@ func cudaNVidiaPath(plugin *Plugin) (nvidiaExpectedPath string, found bool) {
return nvidiaExpectedPath, err == nil && fi.IsDir()
}

// XlaFlagsEnv is the name of the environment variable to set XLA_FLAGS.
const XlaFlagsEnv = "XLA_FLAGS"

// cudaSetCUDADir as a flag set into the environment variable XLA_FLAGS.
func cudaSetCUDADir(nvidiaPath string) {
existingXLAFlags := os.Getenv(XlaFlagsEnv)
const (
XLAFlagsEnv = "XLA_FLAGS"
)

existingXLAFlags := os.Getenv(XLAFlagsEnv)
var newValue string
if existingXLAFlags != "" && !strings.Contains(existingXLAFlags, "--xla_gpu_cuda_data_dir") {
newValue = fmt.Sprintf("%s --xla_gpu_cuda_data_dir=%s", existingXLAFlags, nvidiaPath)
Expand All @@ -122,9 +123,9 @@ func cudaSetCUDADir(nvidiaPath string) {
newValue = fmt.Sprintf("--xla_gpu_cuda_data_dir=%s", nvidiaPath)
}
if newValue != "" {
err := os.Setenv(XlaFlagsEnv, newValue)
err := os.Setenv(XLAFlagsEnv, newValue)
if err != nil {
klog.Warningf("Failed to set %q environment variable to %q: %v", XlaFlagsEnv, newValue, err)
klog.Warningf("Failed to set %q environment variable to %q: %v", XLAFlagsEnv, newValue, err)
}
}
}
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