X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=Readme.md;h=823518d176aec11aec667cf843d6a6c9bc7f24a0;hp=a759eff665bc9e65e64b578b77c6dcf6532bf07a;hb=a24f28be8567c2527b154ef981090368a2bd8f76;hpb=9cb1f9f2655cd378eec9d88fd57a039a04396aae

diff --git a/Readme.md b/Readme.md
index a759eff6..823518d1 100644
--- a/Readme.md
+++ b/Readme.md
@@ -42,7 +42,7 @@ Currently, Stockfish has the following UCI options:
     this equal to the number of CPU cores available.
 
   * #### Hash
-    The size of the hash table in MB.
+    The size of the hash table in MB. It is recommended to set Hash after setting Threads.
 
   * #### Clear Hash
     Clear the hash table.
@@ -66,13 +66,15 @@ Currently, Stockfish has the following UCI options:
     If enabled by UCI_LimitStrength, aim for an engine strength of the given Elo.
     This Elo rating has been calibrated at a time control of 60s+0.6s and anchored to CCRL 40/4.
 
+  * #### UCI_ShowWDL
+    If enabled, show approximate WDL statistics as part of the engine output.
+    These WDL numbers model expected game outcomes for a given evaluation and
+    game ply for engine self-play at fishtest LTC conditions (60+0.6s per game).
+
   * #### Move Overhead
     Assume a time delay of x ms due to network and GUI overheads. This is useful to
     avoid losses on time in those cases.
 
-  * #### Minimum Thinking Time
-    Search for at least x ms per move.
-
   * #### Slow Mover
     Lower values will make Stockfish take less time in games, higher values will
     make it think longer.
@@ -138,20 +140,50 @@ more compact than Nalimov tablebases, while still storing all information
 needed for optimal play and in addition being able to take into account
 the 50-move rule.
 
+## Large Pages
+
+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
+automatic. Stockfish attempts to use large pages when available and
+will fall back to regular memory allocation when this is not the case.
+
+### Support on Linux
+
+Large page support on Linux is obtained by the Linux kernel
+transparent huge pages functionality. Typically, transparent huge pages
+are already enabled and no configuration is needed.
+
+### Support on Windows
+
+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.
 
 ## Compiling Stockfish yourself from the sources
 
-On Unix-like systems, it should be possible to compile Stockfish
-directly from the source code with the included Makefile.
+Stockfish has support for 32 or 64-bit CPUs, certain hardware
+instructions, big-endian machines such as Power PC, and other platforms.
+
+On Unix-like systems, it should be easy to compile Stockfish
+directly from the source code with the included Makefile in the folder
+`src`. In general it is recommended to run `make help` to see a list of make
+targets with corresponding descriptions.
 
-Stockfish has support for 32 or 64-bit CPUs, the hardware POPCNT
-instruction, big-endian machines such as Power PC, and other platforms.
+```
+    cd src
+    make help
+    make build ARCH=x86-64-modern
+```
 
-In general it is recommended to run `make help` to see a list of make
-targets with corresponding descriptions. When not using the Makefile to
-compile (for instance with Microsoft MSVC) you need to manually
-set/unset some switches in the compiler command line; see file *types.h*
-for a quick reference.
+When not using the Makefile to compile (for instance with Microsoft MSVC) you
+need to manually set/unset some switches in the compiler command line; see
+file *types.h* for a quick reference.
 
 When reporting an issue or a bug, please tell us which version and
 compiler you used to create your executable. These informations can