diff --git a/aten/src/ATen/CMakeLists.txt b/aten/src/ATen/CMakeLists.txt
index 0d90f8a34e40..580edaadbeba 100644
--- a/aten/src/ATen/CMakeLists.txt
+++ b/aten/src/ATen/CMakeLists.txt
@@ -605,6 +605,11 @@ if(UNIX)
   if(HAVE_MALLOC_USABLE_SIZE)
     add_definitions(-DHAVE_MALLOC_USABLE_SIZE=1)
   endif(HAVE_MALLOC_USABLE_SIZE)
+  set(CMAKE_EXTRA_INCLUDE_FILES "fcntl.h")
+  CHECK_FUNCTION_EXISTS(posix_fallocate HAVE_POSIX_FALLOCATE)
+  if(HAVE_POSIX_FALLOCATE)
+    add_definitions(-DHAVE_POSIX_FALLOCATE=1)
+  endif(HAVE_POSIX_FALLOCATE)
 endif(UNIX)
 
 ADD_DEFINITIONS(-DUSE_EXTERNAL_MZCRC)
diff --git a/aten/src/ATen/MapAllocator.cpp b/aten/src/ATen/MapAllocator.cpp
index 63a278050e8a..d88c05f087a9 100644
--- a/aten/src/ATen/MapAllocator.cpp
+++ b/aten/src/ATen/MapAllocator.cpp
@@ -292,6 +292,28 @@ MapAllocator::MapAllocator(WithFd, std::string_view filename, int fd, int flags,
           if (ftruncate(fd, static_cast<off_t>(size)) == -1) {
             TORCH_CHECK(false, "unable to resize file <", filename_, "> to the right size: ", c10::utils::str_error(errno), " (", errno, ")");
           }
+
+#ifdef HAVE_POSIX_FALLOCATE
+          if (flags_ & ALLOCATOR_MAPPED_SHAREDMEM) {
+            for (;;) {
+              if (posix_fallocate(fd, 0, static_cast<off_t>(size)) == 0) {
+                break;
+              }
+
+              if (errno == EINTR) {
+                continue;
+              }
+
+              if (errno == EINVAL || errno == EOPNOTSUPP) {
+                // the underlying filesystem does not support the operation
+                break;
+              }
+
+              TORCH_CHECK(false, "unable to allocate shared memory(shm) for file <", filename_, ">: ", c10::utils::str_error(errno), " (", errno, ")");
+            }
+          }
+#endif
+
           if (fstat(fd, &file_stat) == -1 || file_stat.st_size < static_cast<int64_t>(size)) {
 #ifndef STRIP_ERROR_MESSAGES
             int last_err = errno;
diff --git a/cmake/Dependencies.cmake b/cmake/Dependencies.cmake
index ad8540a86ec8..d39f1a2efc77 100644
--- a/cmake/Dependencies.cmake
+++ b/cmake/Dependencies.cmake
@@ -1541,6 +1541,11 @@ if(NOT INTERN_BUILD_MOBILE)
     if(HAVE_MALLOC_USABLE_SIZE)
       add_definitions(-DHAVE_MALLOC_USABLE_SIZE=1)
     endif(HAVE_MALLOC_USABLE_SIZE)
+    set(CMAKE_EXTRA_INCLUDE_FILES "fcntl.h")
+    CHECK_FUNCTION_EXISTS(posix_fallocate HAVE_POSIX_FALLOCATE)
+    if(HAVE_POSIX_FALLOCATE)
+      add_definitions(-DHAVE_POSIX_FALLOCATE=1)
+    endif(HAVE_POSIX_FALLOCATE)
   endif(UNIX)
 
   add_definitions(-DUSE_EXTERNAL_MZCRC)