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      1 /* Copyright 2015 The TensorFlow Authors. All Rights Reserved.
      2 
      3 Licensed under the Apache License, Version 2.0 (the "License");
      4 you may not use this file except in compliance with the License.
      5 You may obtain a copy of the License at
      6 
      7     http://www.apache.org/licenses/LICENSE-2.0
      8 
      9 Unless required by applicable law or agreed to in writing, software
     10 distributed under the License is distributed on an "AS IS" BASIS,
     11 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     12 See the License for the specific language governing permissions and
     13 limitations under the License.
     14 ==============================================================================*/
     15 
     16 #include "tensorflow/core/common_runtime/device_mgr.h"
     17 
     18 #include <vector>
     19 #include "tensorflow/core/common_runtime/local_device.h"
     20 #include "tensorflow/core/framework/device_attributes.pb.h"
     21 #include "tensorflow/core/lib/core/errors.h"
     22 #include "tensorflow/core/platform/logging.h"
     23 #include "tensorflow/core/util/device_name_utils.h"
     24 
     25 namespace tensorflow {
     26 
     27 DeviceMgr::DeviceMgr(const std::vector<Device*>& devices)
     28     : name_backing_store_(128) {
     29   for (Device* d : devices) {
     30     devices_.push_back(d);
     31 
     32     // Register under the (1) full name and (2) canonical name.
     33     for (const string& name :
     34          DeviceNameUtils::GetNamesForDeviceMappings(d->parsed_name())) {
     35       device_map_[CopyToBackingStore(name)] = d;
     36     }
     37     // Register under the (3) local name and (4) legacy local name.
     38     for (const string& name :
     39          DeviceNameUtils::GetLocalNamesForDeviceMappings(d->parsed_name())) {
     40       device_map_[CopyToBackingStore(name)] = d;
     41     }
     42     device_type_counts_[d->device_type()]++;
     43   }
     44 }
     45 
     46 DeviceMgr::~DeviceMgr() {
     47   // TODO(b/37437134): Remove destructor after converting to std::unique_ptr.
     48   for (Device* p : devices_) delete p;
     49 }
     50 
     51 StringPiece DeviceMgr::CopyToBackingStore(StringPiece s) {
     52   size_t n = s.size();
     53   char* space = name_backing_store_.Alloc(n);
     54   memcpy(space, s.data(), n);
     55   return StringPiece(space, n);
     56 }
     57 
     58 void DeviceMgr::ListDeviceAttributes(
     59     std::vector<DeviceAttributes>* devices) const {
     60   devices->reserve(devices_.size());
     61   for (Device* dev : devices_) {
     62     devices->emplace_back(dev->attributes());
     63   }
     64 }
     65 
     66 std::vector<Device*> DeviceMgr::ListDevices() const {
     67   return std::vector<Device*>(devices_.begin(), devices_.end());
     68 }
     69 
     70 string DeviceMgr::DebugString() const {
     71   string out;
     72   for (Device* dev : devices_) {
     73     strings::StrAppend(&out, dev->name(), "\n");
     74   }
     75   return out;
     76 }
     77 
     78 string DeviceMgr::DeviceMappingString() const {
     79   string out;
     80   for (Device* dev : devices_) {
     81     if (!dev->attributes().physical_device_desc().empty()) {
     82       strings::StrAppend(&out, dev->name(), " -> ",
     83                          dev->attributes().physical_device_desc(), "\n");
     84     }
     85   }
     86   return out;
     87 }
     88 
     89 Status DeviceMgr::LookupDevice(StringPiece name, Device** device) const {
     90   Status s;
     91   auto iter = device_map_.find(name);
     92   if (iter == device_map_.end()) {
     93     std::vector<StringPiece> device_names;
     94     for (auto&& itr : device_map_) {
     95       device_names.push_back(itr.first);
     96     }
     97     LOG(WARNING) << "Unknown device: " << name
     98                  << " all devices: " << str_util::Join(device_names, ", ");
     99     return errors::InvalidArgument(name, " unknown device.");
    100   }
    101   *device = iter->second;
    102   return Status::OK();
    103 }
    104 
    105 void DeviceMgr::ClearContainers(gtl::ArraySlice<string> containers) const {
    106   Status s;
    107   for (Device* dev : devices_) {
    108     if (containers.empty()) {
    109       s.Update(dev->resource_manager()->Cleanup(
    110           dev->resource_manager()->default_container()));
    111     } else {
    112       for (const string& c : containers) {
    113         s.Update(dev->resource_manager()->Cleanup(c));
    114       }
    115     }
    116     if (!s.ok()) {
    117       LOG(WARNING) << s;
    118     }
    119   }
    120 }
    121 
    122 int DeviceMgr::NumDeviceType(const string& type) const {
    123   auto iter = device_type_counts_.find(type);
    124   if (iter != device_type_counts_.end()) return iter->second;
    125   return 0;
    126 }
    127 
    128 }  // namespace tensorflow
    129