From d95759b7f967d0a9d18de6d73873ec4913d54e15 Mon Sep 17 00:00:00 2001
From: Daniel Schwen <daniel.schwen@inl.gov>
Date: Fri, 10 Mar 2017 11:02:53 -0700
Subject: [PATCH] Address comments (#8619)

---
 .../include/postprocessors/MemoryUsage.h      |  8 ++--
 framework/src/postprocessors/MemoryUsage.C    | 46 ++++++++++++-------
 .../memory_usage/print_memory_usage.i         |  4 +-
 3 files changed, 36 insertions(+), 22 deletions(-)

diff --git a/framework/include/postprocessors/MemoryUsage.h b/framework/include/postprocessors/MemoryUsage.h
index 7fc02d4ee5e9..d2b0fe4f9523 100644
--- a/framework/include/postprocessors/MemoryUsage.h
+++ b/framework/include/postprocessors/MemoryUsage.h
@@ -19,7 +19,7 @@
 
 class MemoryUsage;
 
-template<>
+template <>
 InputParameters validParams<MemoryUsage>();
 
 /**
@@ -38,13 +38,15 @@ class MemoryUsage : public GeneralPostprocessor
   virtual PostprocessorValue getValue() override;
 
 protected:
-  enum class MemType {
+  enum class MemType
+  {
     virtual_memory,
     physical_memory,
     page_faults
   } _mem_type;
 
-  enum class ValueType {
+  enum class ValueType
+  {
     total,
     average,
     max_process,
diff --git a/framework/src/postprocessors/MemoryUsage.C b/framework/src/postprocessors/MemoryUsage.C
index 4ceeb80796e0..6b525e89683f 100644
--- a/framework/src/postprocessors/MemoryUsage.C
+++ b/framework/src/postprocessors/MemoryUsage.C
@@ -23,21 +23,25 @@
 #include <mach/mach.h>
 #endif
 
-template<>
-InputParameters validParams<MemoryUsage>()
+template <>
+InputParameters
+validParams<MemoryUsage>()
 {
   InputParameters params = validParams<GeneralPostprocessor>();
   params.addClassDescription("Memory usage statistics for the running simulation.");
   MooseEnum mem_type("virtual_memory physical_memory page_faults", "virtual_memory");
   params.addParam<MooseEnum>("mem_type", mem_type, "Memory metric to report.");
   MooseEnum value_type("total average max_process min_processs", "total");
-  params.addParam<MooseEnum>("value_type", value_type, "Aggregation method to apply to the requested memory metric.");
-  params.addParam<bool>("report_peak_value", true, "If the postprocessor is executed more than one during a time step, report the aggregated peak value.");
+  params.addParam<MooseEnum>("value_type", value_type,
+                             "Aggregation method to apply to the requested memory metric.");
+  params.addParam<bool>("report_peak_value", true, "If the postprocessor is executed more than one "
+                                                   "during a time step, report the aggregated peak "
+                                                   "value.");
   return params;
 }
 
-MemoryUsage::MemoryUsage(const InputParameters & parameters) :
-    GeneralPostprocessor(parameters),
+MemoryUsage::MemoryUsage(const InputParameters & parameters)
+  : GeneralPostprocessor(parameters),
     _mem_type(getParam<MooseEnum>("mem_type").getEnum<MemType>()),
     _value_type(getParam<MooseEnum>("value_type").getEnum<ValueType>()),
     _report_peak_value(getParam<bool>("report_peak_value"))
@@ -59,6 +63,15 @@ MemoryUsage::initialize()
 void
 MemoryUsage::execute()
 {
+  // data entries are numbered according to their position in /proc/self/stat
+  enum StatItem
+  {
+    index_page_faults = 8,
+    index_virtual_size = 19,
+    index_resident_size = 20,
+    num = 21 // total number of entries read
+  };
+
   // inspect /proc
   std::ifstream stat_stream("/proc/self/stat", std::ios_base::in);
   std::array<unsigned long, 21> val;
@@ -67,25 +80,26 @@ MemoryUsage::execute()
     // if the proc filesystem file is found (Linux) read its contents
     std::string pid, comm, state;
     stat_stream >> pid >> comm >> state;
-    for (unsigned int i = 0; i < 21; ++i)
+    for (unsigned int i = 0; i < num; ++i)
       stat_stream >> val[i];
 
     // resident size is reported as number of pages in /proc
-    val[20] *= sysconf(_SC_PAGE_SIZE);
+    val[index_resident_size] *= sysconf(_SC_PAGE_SIZE);
   }
   else
   {
     // set all data entries to zero (if all else should fail)
     val.fill(0);
 
-    // obtain mach task info on mac OS
+// obtain mach task info on mac OS
 #ifdef __APPLE__
     struct task_basic_info t_info;
     mach_msg_type_number_t t_info_count = TASK_BASIC_INFO_COUNT;
-    if (KERN_SUCCESS == task_info(mach_task_self(), TASK_BASIC_INFO, reinterpret_cast<task_info_t>(&t_info),  &t_info_count))
+    if (KERN_SUCCESS == task_info(mach_task_self(), TASK_BASIC_INFO,
+                                  reinterpret_cast<task_info_t>(&t_info), &t_info_count))
     {
-      val[19] = t_info.virtual_size;
-      val[20] = t_info.resident_size;
+      val[index_virtual_size] = t_info.virtual_size;
+      val[index_resident_size] = t_info.resident_size;
     }
 #endif
   }
@@ -94,16 +108,16 @@ MemoryUsage::execute()
   switch (_mem_type)
   {
     case MemType::virtual_memory:
-      _value = val[19];
+      _value = val[index_virtual_size];
       break;
 
     case MemType::physical_memory:
-      _value = val[20];
+      _value = val[index_resident_size];
       break;
 
     case MemType::page_faults:
       // major page faults are currently only reported on Linux systems
-      _value = val[8];
+      _value = val[index_page_faults];
       break;
   }
 }
@@ -141,5 +155,3 @@ MemoryUsage::getValue()
 {
   return _report_peak_value ? _peak_value : _value;
 }
-
-#undef RUSAGE_AVAILABLE
diff --git a/test/tests/postprocessors/memory_usage/print_memory_usage.i b/test/tests/postprocessors/memory_usage/print_memory_usage.i
index d37a3203b3b8..98dfdc3d6378 100644
--- a/test/tests/postprocessors/memory_usage/print_memory_usage.i
+++ b/test/tests/postprocessors/memory_usage/print_memory_usage.i
@@ -87,8 +87,8 @@
 [Executioner]
   type = Transient
   solve_type = 'NEWTON'
-  petsc_options_iname = '-pc_type'
-  petsc_options_value = 'lu'
+  petsc_options_iname = '-pc_type -sub_pc_type'
+  petsc_options_value = 'asm      lu'
 
   nl_abs_tol = 1e-10