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diff --git a/doc/diagrams/benchmarks-set/vs/scattered unsuccessful looukp.xlsx.practice.png b/doc/diagrams/benchmarks-set/vs/scattered unsuccessful looukp.xlsx.practice.png
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diff --git a/extra/boost_unordered.natvis b/extra/boost_unordered.natvis
index ff5e5640..58ba0427 100644
--- a/extra/boost_unordered.natvis
+++ b/extra/boost_unordered.natvis
@@ -170,7 +170,7 @@ file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
         </Expand>
     </Type>
 
-    <Type Name="boost::unordered::detail::cumulative_stats&lt;*&gt;" Inheritable="true">
+    <Type Name="boost::unordered::detail::foa::cumulative_stats&lt;*&gt;" Inheritable="true">
         <Intrinsic Name="bit_cast_to_double" Expression="*reinterpret_cast&lt;double*&gt;(&amp;i)">
             <Parameter Name="i" Type="uint64_t" />
         </Intrinsic>
diff --git a/include/boost/unordered/detail/foa/core.hpp b/include/boost/unordered/detail/foa/core.hpp
index db73a866..e89a21cf 100644
--- a/include/boost/unordered/detail/foa/core.hpp
+++ b/include/boost/unordered/detail/foa/core.hpp
@@ -41,7 +41,7 @@
 #include <utility>
 
 #if defined(BOOST_UNORDERED_ENABLE_STATS)
-#include <boost/unordered/detail/cumulative_stats.hpp>
+#include <boost/unordered/detail/foa/cumulative_stats.hpp>
 #endif
 
 #if !defined(BOOST_UNORDERED_DISABLE_SSE2)
diff --git a/include/boost/unordered/detail/cumulative_stats.hpp b/include/boost/unordered/detail/foa/cumulative_stats.hpp
similarity index 92%
rename from include/boost/unordered/detail/cumulative_stats.hpp
rename to include/boost/unordered/detail/foa/cumulative_stats.hpp
index 1378c0db..13a15747 100644
--- a/include/boost/unordered/detail/cumulative_stats.hpp
+++ b/include/boost/unordered/detail/foa/cumulative_stats.hpp
@@ -6,8 +6,8 @@
  * See https://www.boost.org/libs/unordered for library home page.
  */
 
-#ifndef BOOST_UNORDERED_DETAIL_CUMULATIVE_STATS_HPP
-#define BOOST_UNORDERED_DETAIL_CUMULATIVE_STATS_HPP
+#ifndef BOOST_UNORDERED_DETAIL_FOA_CUMULATIVE_STATS_HPP
+#define BOOST_UNORDERED_DETAIL_FOA_CUMULATIVE_STATS_HPP
 
 #include <array>
 #include <boost/config.hpp>
@@ -16,12 +16,14 @@
 #include <cstddef>
 
 #if defined(BOOST_HAS_THREADS)
+#include <boost/unordered/detail/foa/rw_spinlock.hpp>
 #include <mutex>
 #endif
 
 namespace boost{
 namespace unordered{
 namespace detail{
+namespace foa{
 
 /* Cumulative one-pass calculation of the average, variance and deviation of
  * running sequences.
@@ -117,7 +119,7 @@ template<std::size_t N>
 class concurrent_cumulative_stats:cumulative_stats<N>
 {
   using super=cumulative_stats<N>;
-  using lock_guard=std::lock_guard<std::mutex>;
+  using lock_guard=std::lock_guard<rw_spinlock>;
 
 public:
   using summary=typename super::summary;
@@ -157,7 +159,7 @@ public:
 private:
   concurrent_cumulative_stats(const super& x,lock_guard&&):super{x}{}
 
-  mutable std::mutex mut;
+  mutable rw_spinlock mut;
 };
 
 #else
@@ -167,6 +169,7 @@ using concurrent_cumulative_stats=cumulative_stats<N>;
 
 #endif
 
+} /* namespace foa */
 } /* namespace detail */
 } /* namespace unordered */
 } /* namespace boost */
diff --git a/test/Jamfile.v2 b/test/Jamfile.v2
index 6a7fadd6..256b8489 100644
--- a/test/Jamfile.v2
+++ b/test/Jamfile.v2
@@ -1,6 +1,7 @@
 
 # Copyright 2006-2008 Daniel James.
 # Copyright 2022-2023 Christian Mazakas
+# Copyright 2024 Joaquin M Lopez Munoz
 # Distributed under the Boost Software License, Version 1.0. (See accompanying
 # file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 
@@ -367,6 +368,27 @@ run cfoa/serialization_tests.cpp
       <library>/boost/serialization//boost_serialization/<warnings>off
     : cfoa_serialization_tests ;
 
+rule make_cfoa_interprocess_concurrency_tests ( name : defines ? )
+{
+    run cfoa/interprocess_concurrency_tests.cpp /boost/filesystem//boost_filesystem : :
+        : <define>$(defines)
+          <warnings>off
+          <link>static
+          <toolset>clang-3.5:<build>no # Boost.Process does not compile
+          <toolset>clang-3.6:<build>no # idem
+          <toolset>clang-3.7:<build>no # idem
+          <toolset>clang-3.8:<build>no # idem
+          <target-os>cygwin:<build>no
+        : $(name) ;
+}
+
+make_cfoa_interprocess_concurrency_tests cfoa_interproc_conc_tests ;
+
+make_cfoa_interprocess_concurrency_tests cfoa_interproc_conc_tests_stats
+    :  BOOST_UNORDERED_ENABLE_STATS ;
+
 alias cfoa_tests :
   cfoa_$(CFOA_TESTS)
-  cfoa_serialization_tests ;
+  cfoa_serialization_tests
+  cfoa_interproc_conc_tests
+  cfoa_interproc_conc_tests_stats ;
diff --git a/test/cfoa/interprocess_concurrency_tests.cpp b/test/cfoa/interprocess_concurrency_tests.cpp
new file mode 100644
index 00000000..5cfeea45
--- /dev/null
+++ b/test/cfoa/interprocess_concurrency_tests.cpp
@@ -0,0 +1,114 @@
+// Copyright (C) 2024 Joaquin M Lopez Munoz
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#include <boost/unordered/concurrent_flat_map.hpp>
+#include <atomic>
+#include <boost/core/lightweight_test.hpp>
+#include <boost/interprocess/allocators/allocator.hpp>
+#include <boost/interprocess/managed_shared_memory.hpp>
+#include <boost/process/child.hpp>
+#include <boost/uuid/random_generator.hpp>
+#include <boost/uuid/uuid_io.hpp>
+#include <chrono>
+#include <cstdlib>
+#include <random>
+#include <string>
+#include <thread>
+#include <vector>
+
+namespace bip=boost::interprocess;
+
+static char const* container_name = "shared_map";
+static char const* start_name = "shared_start";
+static constexpr int NUM_OPS_PER_CHILD = 10000;
+
+using value_type = std::pair<const int, int>;
+using allocator = bip::allocator<
+  value_type, bip::managed_shared_memory::segment_manager>;
+using container = boost::concurrent_flat_map<
+  int, int, boost::hash<int>, std::equal_to<int>, allocator>;
+
+int parent(const char* exe_name)
+{
+  static constexpr int NUM_CHILDS = 10;
+  static constexpr std::size_t SEGMENT_SIZE = 64*1024;
+
+  std::string segment_name_str = to_string(boost::uuids::random_generator()());
+  auto* segment_name = segment_name_str.c_str();
+
+  struct segment_remover
+  {
+    char const* name;
+
+    segment_remover(char const* name_) : name(name_)
+    {
+      bip::shared_memory_object::remove(name);
+    }
+    ~segment_remover()
+    {
+      bip::shared_memory_object::remove(name);
+    }
+  } remover(segment_name);
+
+  bip::managed_shared_memory segment(
+    bip::create_only, segment_name, SEGMENT_SIZE);
+  container& c = *segment.construct<container>(container_name)(
+    allocator(segment.get_segment_manager()));
+  std::atomic_int& start = *segment.construct<std::atomic_int>(start_name)(0);
+
+  std::vector<boost::process::child> children;
+  for (int i = 0; i < NUM_CHILDS; ++i) {
+    children.emplace_back(exe_name, std::to_string(i), segment_name);
+  }
+
+  start.store(1);
+
+  for (auto& child : children) {
+    child.wait();
+    BOOST_TEST_EQ(child.exit_code(), 0);
+  }
+
+  int num_ops = 0;
+  c.cvisit_all([&](const value_type& x) {
+    num_ops += x.second;
+  });
+  BOOST_TEST_EQ(num_ops, NUM_CHILDS * NUM_OPS_PER_CHILD);
+
+  return boost::report_errors();
+}
+
+int child(int id,const char* segment_name)
+{
+  bip::managed_shared_memory segment(bip::open_only, segment_name);
+  container& c = *segment.find<container>(container_name).first;
+  std::atomic_int& start = *segment.find<std::atomic_int>(start_name).first;
+
+  while(!start.load()){
+    std::this_thread::sleep_for(std::chrono::milliseconds(1));
+  }
+
+  std::mt19937 rnd((unsigned int) id);
+  std::geometric_distribution<int> d(0.15);
+
+  for(int i = 0; i < NUM_OPS_PER_CHILD; ++i) {
+    c.emplace_or_visit(d(rnd), 1, [&](value_type& x) {
+      ++x.second;
+
+      // artificially increase contention
+      volatile unsigned int n = 10000;
+      while(n--) ;
+    });
+  }
+  return 0;
+}
+
+int main(int argc, char** argv)
+{
+  if (argc == 1) {
+    return parent(argv[0]);
+  }
+  else { 
+    return child(std::atoi(argv[1]),argv[2]);
+  }
+}