Suppress info strings before 'uci'

On Windows, Stockfish wouldn't launch in some GUI because we output some
info strings (about the use of large pages) before sending the 'uci'
command. It seems more robust to suppress these info strings, and instead
to add a proper section section in the Readme about large pages use.

fixes #3052
closes #3147

No functional change

README.md

@@ -198,8 +198,8 @@ the 50-move rule.
 
 Stockfish supports large pages on Linux and Windows. Large pages make
 the hash access more efficient, improving the engine speed, especially
-on large hash sizes. Typical increases are 5..10% in terms of nps, but
-speed increases up to 30% have been measured. The support is
+on large hash sizes. Typical increases are 5..10% in terms of nodes per
+second, but speed increases up to 30% have been measured. The support is
 automatic. Stockfish attempts to use large pages when available and
 will fall back to regular memory allocation when this is not the case.
 
@@ -213,11 +213,11 @@ are already enabled and no configuration is needed.
 
 The use of large pages requires "Lock Pages in Memory" privilege. See
 [Enable the Lock Pages in Memory Option (Windows)](https://docs.microsoft.com/en-us/sql/database-engine/configure-windows/enable-the-lock-pages-in-memory-option-windows)
-on how to enable this privilege. Logout/login may be needed
-afterwards. Due to memory fragmentation, it may not always be
-possible to allocate large pages even when enabled. A reboot
-might alleviate this problem. To determine whether large pages
-are in use, see the engine log.
+on how to enable this privilege, then run [RAMMap](https://docs.microsoft.com/en-us/sysinternals/downloads/rammap)
+to double-check that large pages are used. We suggest that you reboot
+your computer after you have enabled large pages, because long Windows
+sessions suffer from memory fragmentation which may prevent Stockfish
+from getting large pages: a fresh session is better in this regard.
 
 ## Compiling Stockfish yourself from the sources
 
@@ -232,8 +232,8 @@ targets with corresponding descriptions.
 ```
     cd src
     make help
-    make build ARCH=x86-64-modern
     make net
+    make build ARCH=x86-64-modern
 ```
 
 When not using the Makefile to compile (for instance with Microsoft MSVC) you

src/misc.cpp

@@ -408,22 +408,8 @@ static void* aligned_large_pages_alloc_win(size_t allocSize) {
 
 void* aligned_large_pages_alloc(size_t allocSize) {
 
-  static bool firstCall = true;
-  void* mem;
-
   // Try to allocate large pages
-  mem = aligned_large_pages_alloc_win(allocSize);
-
-  // Suppress info strings on the first call. The first call occurs before 'uci'
-  // is received and in that case this output confuses some GUIs.
-  if (!firstCall)
-  {
-      if (mem)
-          sync_cout << "info string Hash table allocation: Windows large pages used." << sync_endl;
-      else
-          sync_cout << "info string Hash table allocation: Windows large pages not used." << sync_endl;
-  }
-  firstCall = false;
+  void* mem = aligned_large_pages_alloc_win(allocSize);
 
   // Fall back to regular, page aligned, allocation if necessary
   if (!mem)