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#include "tensorflow/stream_executor/dso_loader.h"
#include <dlfcn.h>
#include <limits.h>
#include <stdlib.h>
#include <unistd.h>
#include <initializer_list>
#include "tensorflow/stream_executor/platform/port.h"
#include <vector>
#include "tensorflow/stream_executor/lib/error.h"
#include "tensorflow/stream_executor/lib/str_util.h"
#include "tensorflow/stream_executor/lib/strcat.h"
#include "tensorflow/stream_executor/lib/stringprintf.h"
#include "tensorflow/stream_executor/platform/logging.h"
#include "tensorflow/stream_executor/platform/port.h"
#include "tensorflow/stream_executor/lib/str_util.h"
namespace perftools {
namespace gputools {
namespace internal {
/* static */ port::Status DsoLoader::GetCublasDsoHandle(void** dso_handle) {
return GetDsoHandle(FindDsoPath("libcublas.so.7.0",
"third_party/gpus/cuda/lib64"),
dso_handle);
}
/* static */ port::Status DsoLoader::GetCudnnDsoHandle(void** dso_handle) {
// libcudnn is versioned differently than the other libraries. See b/22397368
// for some details about the complications surrounding this.
return GetDsoHandle(FindDsoPath("libcudnn.so.6.5",
"third_party/gpus/cuda/lib64"),
dso_handle);
}
/* static */ port::Status DsoLoader::GetCufftDsoHandle(void** dso_handle) {
return GetDsoHandle(FindDsoPath("libcufft.so.7.0",
"third_party/gpus/cuda/lib64"),
dso_handle);
}
/* static */ port::Status DsoLoader::GetCurandDsoHandle(void** dso_handle) {
return GetDsoHandle(FindDsoPath("libcurand.so.7.0",
"third_party/gpus/cuda/lib64"),
dso_handle);
}
/* static */ port::Status DsoLoader::GetLibcudaDsoHandle(void** dso_handle) {
return GetDsoHandle(FindDsoPath("libcuda.so",
"third_party/gpus/cuda/driver/lib64"),
dso_handle);
}
/* static */ port::Status DsoLoader::GetLibcuptiDsoHandle(void** dso_handle) {
return GetDsoHandle(
FindDsoPath("libcupti.so.7.0",
"third_party/gpus/cuda/extras/CUPTI/lib64"),
dso_handle);
}
/* static */ void DsoLoader::RegisterRpath(port::StringPiece path) {
mutex_lock lock{rpath_mutex_};
GetRpaths()->push_back(path.ToString());
}
/* static */ port::Status DsoLoader::GetDsoHandle(port::StringPiece path,
void** dso_handle,
LoadKind load_kind) {
int dynload_flags =
RTLD_LAZY | (load_kind == LoadKind::kLocal ? RTLD_LOCAL : RTLD_GLOBAL);
string path_string = path.ToString();
*dso_handle = dlopen(path_string.c_str(), dynload_flags);
if (*dso_handle == nullptr) {
LOG(INFO) << "LD_LIBRARY_PATH: " << getenv("LD_LIBRARY_PATH");
// TODO(b/22689637): Eliminate unnecessary ToString once StrCat has been
// moved to the open-sourceable version.
return port::Status(
port::error::FAILED_PRECONDITION,
port::StrCat("could not dlopen DSO: ", path, "; dlerror: ", dlerror()));
}
VLOG(2) << "loaded path \"" << path << "\" "
<< (load_kind == LoadKind::kLocal ? "locally" : "globally");
return port::Status::OK();
}
/* static */ string DsoLoader::GetBinaryDirectory(bool strip_executable_name) {
char exe_path[PATH_MAX] = {0};
CHECK_ERR(readlink("/proc/self/exe", exe_path, sizeof(exe_path) - 1));
// Make sure it's null-terminated:
exe_path[sizeof(exe_path) - 1] = 0;
if (strip_executable_name) {
// The exe is the last component of the path, so remove one component.
std::vector<string> components = port::Split(exe_path, '/');
components.pop_back();
return port::Join(components, "/");
}
return exe_path;
}
// Creates a heap-allocated vector for initial rpaths.
// Ownership is transferred to the caller.
static std::vector<string>* CreatePrimordialRpaths() {
auto rpaths = new std::vector<string>;
rpaths->push_back(
"driver/driver_sh.runfiles/third_party/gpus/cuda/lib64");
return rpaths;
}
/* static */ mutex DsoLoader::rpath_mutex_{LINKER_INITIALIZED};
/* static */ std::vector<string>* DsoLoader::GetRpaths() {
static std::vector<string>* rpaths = CreatePrimordialRpaths();
return rpaths;
}
/* static */ bool DsoLoader::TrySymbolicDereference(string* candidate) {
char buf[PATH_MAX];
char* result = realpath(candidate->c_str(), buf);
if (result == nullptr) {
return false;
}
VLOG(3) << "realpath resolved candidate path \"" << *candidate << "\" to \""
<< result << "\"";
*candidate = result;
return true;
}
/* static */ string DsoLoader::FindDsoPath(port::StringPiece library_name,
port::StringPiece runfiles_relpath) {
// Keep a record of the paths we attempted so we can dump out meaningful
// diagnostics if no path is found.
std::vector<string> attempted;
using StringPieces = std::vector<port::StringPiece>;
string candidate;
// Otherwise, try binary-plus-rpath locations.
string binary_directory =
GetBinaryDirectory(true /* = strip_executable_name */);
mutex_lock lock{rpath_mutex_};
for (const string& rpath : *GetRpaths()) {
candidate =
port::Join(StringPieces{binary_directory, rpath, library_name}, "/");
if (TrySymbolicDereference(&candidate)) {
return candidate;
}
}
attempted.push_back(candidate);
return library_name.ToString();
}
// -- CachedDsoLoader
/* static */ port::StatusOr<void*> CachedDsoLoader::GetCublasDsoHandle() {
static port::StatusOr<void*> result =
FetchHandleResult(DsoLoader::GetCublasDsoHandle);
return result;
}
/* static */ port::StatusOr<void*> CachedDsoLoader::GetCurandDsoHandle() {
static port::StatusOr<void*> result =
FetchHandleResult(DsoLoader::GetCurandDsoHandle);
return result;
}
/* static */ port::StatusOr<void*> CachedDsoLoader::GetCudnnDsoHandle() {
static port::StatusOr<void*> result =
FetchHandleResult(DsoLoader::GetCudnnDsoHandle);
return result;
}
/* static */ port::StatusOr<void*> CachedDsoLoader::GetCufftDsoHandle() {
static port::StatusOr<void*> result =
FetchHandleResult(DsoLoader::GetCufftDsoHandle);
return result;
}
/* static */ port::StatusOr<void*> CachedDsoLoader::GetLibcudaDsoHandle() {
static port::StatusOr<void*> result =
FetchHandleResult(DsoLoader::GetLibcudaDsoHandle);
return result;
}
/* static */ port::StatusOr<void*> CachedDsoLoader::GetLibcuptiDsoHandle() {
static port::StatusOr<void*> result =
FetchHandleResult(DsoLoader::GetLibcuptiDsoHandle);
return result;
}
/* static */ port::StatusOr<void*> CachedDsoLoader::FetchHandleResult(
std::function<port::Status(void**)> load_dso) {
void* handle;
auto status = load_dso(&handle);
if (!status.ok()) {
return status;
}
return handle;
}
} // namespace internal
} // namespace gputools
} // namespace perftools
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