human readable memory warns (#14361)

* human readable memory warns test=develop

* update test=develop

* refine test=develop

* fix build test=develop

Author: typhoonzero

paddle/fluid/memory/malloc.cc

@@ -12,6 +12,7 @@ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License. */
 
+#include <string>
 #include <vector>
 
 #include "paddle/fluid/memory/malloc.h"
@@ -21,6 +22,7 @@ limitations under the License. */
 #include "paddle/fluid/memory/detail/buddy_allocator.h"
 #include "paddle/fluid/memory/detail/system_allocator.h"
 #include "paddle/fluid/platform/gpu_info.h"
+#include "paddle/fluid/string/printf.h"
 
 DEFINE_bool(init_allocated_mem, false,
             "It is a mistake that the values of the memory allocated by "
@@ -137,12 +139,18 @@ void* Alloc<platform::CUDAPlace>(platform::CUDAPlace place, size_t size) {
     platform::SetDeviceId(place.device);
     size_t avail, total;
     platform::GpuMemoryUsage(&avail, &total);
-    LOG(WARNING) << "Cannot allocate " << size << " bytes in GPU "
-                 << place.device << ", available " << avail << " bytes";
+    LOG(WARNING) << "Cannot allocate " << string::HumanReadableSize(size)
+                 << " in GPU " << place.device << ", available "
+                 << string::HumanReadableSize(avail);
     LOG(WARNING) << "total " << total;
-    LOG(WARNING) << "GpuMinChunkSize " << buddy_allocator->GetMinChunkSize();
-    LOG(WARNING) << "GpuMaxChunkSize " << buddy_allocator->GetMaxChunkSize();
-    LOG(WARNING) << "GPU memory used: " << Used<platform::CUDAPlace>(place);
+    LOG(WARNING) << "GpuMinChunkSize "
+                 << string::HumanReadableSize(
+                        buddy_allocator->GetMinChunkSize());
+    LOG(WARNING) << "GpuMaxChunkSize "
+                 << string::HumanReadableSize(
+                        buddy_allocator->GetMaxChunkSize());
+    LOG(WARNING) << "GPU memory used: "
+                 << string::HumanReadableSize(Used<platform::CUDAPlace>(place));
     platform::SetDeviceId(cur_dev);
   }
   if (FLAGS_init_allocated_mem) {

paddle/fluid/string/printf.h

@@ -72,6 +72,7 @@
 #include <iostream>
 #include <sstream>
 #include <string>
+#include <vector>
 
 #include "tinyformat/tinyformat.h"  // https://github.com/c42f/tinyformat
 
@@ -102,5 +103,22 @@ void Printf(const char* fmt, const Args&... args) {
   Fprintf(std::cout, fmt, args...);
 }
 
+template <typename T>
+std::string HumanReadableSize(T size) {
+  size_t i = 0;
+  double f_size = static_cast<double>(size);
+  double orig = f_size;
+  const std::vector<std::string> units(
+      {"B", "kB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB"});
+  while (f_size > 1024) {
+    f_size /= 1024;
+    i++;
+  }
+  if (i >= units.size()) {
+    return Sprintf("%fB", orig);
+  }
+  return Sprintf("%f%s", f_size, units[i]);
+}
+
 }  // namespace string
 }  // namespace paddle