!9486 output warning info when memroy > 95% in batchop timestamp

From: @jonyguo
Reviewed-by: 
Signed-off-by:

mindspore/ccsrc/minddata/dataset/engine/datasetops/batch_op.cc

@@ -26,6 +26,7 @@
 #include "minddata/dataset/engine/db_connector.h"
 #include "minddata/dataset/engine/opt/pass.h"
 #include "minddata/dataset/kernels/data/data_utils.h"
+#include "minddata/dataset/util/status.h"
 
 namespace mindspore {
 namespace dataset {
@@ -131,6 +132,15 @@ Status BatchOp::operator()() {
       worker_queues_[cnt++ % num_workers_]->EmplaceBack(std::make_pair(nullptr, CBatchInfo(batchCtrl::kEOE))));
     RETURN_IF_NOT_OK(GetBatchSize(&cur_batch_size, CBatchInfo(epoch_num, batch_num, cnt - epoch_num)));
     RETURN_IF_NOT_OK(child_iterator_->FetchNextTensorRow(&new_row));
+
+#if !defined(_WIN32) && !defined(_WIN64)
+    if ((num_workers_ > 1 || batch_map_func_) && GetMemoryUsage() > MAX_MEMORY_USAGE_THRESHOLD) {
+      MS_LOG(WARNING) << "Memory consumption is more than " << MAX_MEMORY_USAGE_THRESHOLD * 100 << "%, "
+                      << "which may cause oom error. Please reduce num_parallel_workers size / "
+                      << "optimize per_batch_map function / other python data preprocess function to "
+                      << "reduce memory usage.";
+    }
+#endif
   }  // end of eof_handled() == false
   RETURN_IF_NOT_OK(
     worker_queues_[cnt++ % num_workers_]->EmplaceBack(std::make_pair(nullptr, CBatchInfo(batchCtrl::kEOF))));

mindspore/ccsrc/minddata/dataset/util/status.cc

@@ -15,7 +15,12 @@
  */
 #include "minddata/dataset/util/status.h"
 #include <sstream>
+#include <string>
+#include <memory.h>
+#include <stdio.h>
+#include <stdlib.h>
 #include "utils/ms_utils.h"
+#include "./securec.h"
 
 #ifndef ENABLE_ANDROID
 #include "minddata/dataset/util/task_manager.h"
@@ -139,5 +144,55 @@ std::ostream &operator<<(std::ostream &os, const Status &s) {
 std::string Status::ToString() const { return err_msg_; }
 
 StatusCode Status::get_code() const { return code_; }
+
+#if !defined(_WIN32) && !defined(_WIN64)
+float GetMemoryUsage() {
+  char buf[128] = {0};
+
+  FILE *fd;
+  fd = fopen("/proc/meminfo", "r");
+  if (fd == nullptr) {
+    MS_LOG(WARNING) << "The meminfo file: /proc/meminfo is opened failed.";
+    return 0.0;
+  }
+
+  uint32_t status_count = 0;
+  uint64_t mem_total = 0L;
+  uint64_t mem_available = 0L;
+  while (fgets(buf, sizeof(buf), fd)) {
+    if (status_count == 2) {  // get MemTotal and MemAvailable yet
+      break;
+    }
+
+    // get title
+    std::string line(buf);
+    std::string::size_type position = line.find(":");
+    std::string title = line.substr(0, position);
+
+    // get the value when MemTotal or MemAvailable
+    if (title == "MemTotal") {
+      std::string::size_type pos1 = line.find_last_of(" ");
+      std::string::size_type pos2 = line.find_last_of(" ", pos1 - 1);
+      mem_total = atol(line.substr(pos2, pos1 - pos2).c_str());
+      status_count++;
+    } else if (title == "MemAvailable") {
+      std::string::size_type pos1 = line.find_last_of(" ");
+      std::string::size_type pos2 = line.find_last_of(" ", pos1 - 1);
+      mem_available = atol(line.substr(pos2, pos1 - pos2).c_str());
+      status_count++;
+    }
+
+    (void)memset_s(buf, sizeof(buf), 0, sizeof(buf));
+  }
+  fclose(fd);
+
+  if (status_count != 2 || mem_total == 0 || mem_available > mem_total) {
+    MS_LOG(WARNING) << "Get memory usage failed.";
+    return 0.0;
+  }
+
+  return (1.0 - static_cast<float>(static_cast<double>(mem_available) / static_cast<double>(mem_total)));
+}
+#endif
 }  // namespace dataset
 }  // namespace mindspore

mindspore/ccsrc/minddata/dataset/util/status.h

@@ -167,6 +167,12 @@ class Status {
   StatusCode code_;
   std::string err_msg_;
 };
+
+#if !defined(_WIN32) && !defined(_WIN64)
+const float MAX_MEMORY_USAGE_THRESHOLD = 0.95;
+
+float GetMemoryUsage();
+#endif
 }  // namespace dataset
 }  // namespace mindspore
 #endif  // MINDSPORE_CCSRC_MINDDATA_DATASET_UTIL_STATUS_H_