Inform the OS cache with madvise

drolbr · Nov 4, 2022 · 2a9d964 · 2a9d964
1 parent 56f7e66
commit 2a9d964
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Showing 2 changed files with 2 additions and 1 deletion.
diff --git a/src/template_db/file_blocks.h b/src/template_db/file_blocks.h
@@ -794,6 +794,7 @@ class Mmap
       addr = mmap(0, length, PROT_READ, MAP_PRIVATE, fd, offset);
     if (addr == (void*)(-1))
       throw File_Error(errno, file_name, origin);
+    posix_madvise(addr, length, POSIX_MADV_WILLNEED);
   }
   ~Mmap()
   { 

diff --git a/src/template_db/file_blocks_index.h b/src/template_db/file_blocks_index.h
@@ -206,7 +206,7 @@ struct Readonly_File_Blocks_Index : public File_Blocks_Index_Base
   void increase_block_count(uint32 delta) { params.block_count += delta; }
   virtual bool empty() const { return params.empty_; }
   File_Blocks_Index_Iterator< Index > begin()
-  { //std::cout<<"DEBUG File_Blocks_Idx "<<(void*)idx_file.begin()<<' '<<(void*)idx_file.end()<<' '<<data_file_name<<'\n';
+  { posix_madvise((void*)idx_file.header(), idx_file.size(), POSIX_MADV_WILLNEED);
     return File_Blocks_Index_Iterator< Index >(idx_file.begin(), idx_file.end()); }
   File_Blocks_Index_Iterator< Index > end()
   { return File_Blocks_Index_Iterator< Index >(idx_file.end(), idx_file.end()); }