From 984403142fb6f2f78233b3865d4d2fbc10dc9cda Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?C=C3=A9sar=20Del=20Solar?= <delsolar@gmail.com>
Date: Thu, 26 Feb 2026 21:57:30 -0500
Subject: [PATCH] set ttable fraction

---
 endgame/negamax/transposition_table.go | 12 +++++---
 shell/api.go                           |  8 +++--
 shell/helptext/set.txt                 | 11 +++++++
 shell/shell.go                         | 41 ++++++++++++++++++++++++++
 4 files changed, 66 insertions(+), 6 deletions(-)

diff --git a/endgame/negamax/transposition_table.go b/endgame/negamax/transposition_table.go
index 9f5b2932..63928215 100644
--- a/endgame/negamax/transposition_table.go
+++ b/endgame/negamax/transposition_table.go
@@ -12,6 +12,8 @@ import (
 	"github.com/domino14/macondo/zobrist"
 	"github.com/pbnjay/memory"
 	"github.com/rs/zerolog/log"
+	"golang.org/x/text/language"
+	"golang.org/x/text/message"
 )
 
 const (
@@ -231,10 +233,12 @@ func (t *TranspositionTable) Reset(fractionOfMemory float64, boardDim int) {
 		}
 	}
 
-	log.Info().Int("num-elems", numElems).
-		Float64("desired-num-elems", desiredNElems).
-		Int("estimated-total-memory-bytes", numElems*entrySize).
-		Uint64("mem-limit", totalMem).
+	p := message.NewPrinter(language.English)
+	log.Info().
+		Str("num-elems", p.Sprintf("%d", numElems)).
+		Str("desired-num-elems", p.Sprintf("%.0f", desiredNElems)).
+		Str("estimated-total-memory-bytes", p.Sprintf("%d", numElems*entrySize)).
+		Str("mem-limit", p.Sprintf("%d", totalMem)).
 		Bool("reset", reset).
 		Msg("transposition-table-size")
 
diff --git a/shell/api.go b/shell/api.go
index 477a6448..c385d261 100644
--- a/shell/api.go
+++ b/shell/api.go
@@ -110,11 +110,15 @@ func msg(message string) *Response {
 
 func (sc *ShellController) set(cmd *shellcmd) (*Response, error) {
 	if cmd.args == nil {
-		return msg(sc.options.ToDisplayText()), nil
+		return msg(sc.ToDisplayTextWithConfig()), nil
 	}
 	opt := cmd.args[0]
 	if len(cmd.args) == 1 {
-		_, val := sc.options.Show(opt)
+		ok, val := sc.options.Show(opt)
+		if !ok {
+			// Try showing config option
+			ok, val = sc.ShowConfig(opt)
+		}
 		return msg(val), nil
 	}
 	values := cmd.args[1:]
diff --git a/shell/helptext/set.txt b/shell/helptext/set.txt
index ecd54be9..1c6d2f6e 100644
--- a/shell/helptext/set.txt
+++ b/shell/helptext/set.txt
@@ -11,3 +11,14 @@ set challenge <rule> - Set the current challenge rule
   Valid options are void, 5pt, 10pt, double and single
 
   See `help challengerule` for more detail.
+
+set ttable-mem-fraction <fraction> - Set transposition table memory fraction
+
+  Sets the fraction of system memory to use for the transposition table
+  in the endgame solver. Must be between 0 and 1. Default is 0.25 (25%).
+
+  Example:
+      set ttable-mem-fraction 0.5    # Use 50% of memory
+      set ttable-mem-fraction 0.1    # Use 10% of memory
+
+  Note: Changes take effect the next time the endgame solver is run.
diff --git a/shell/shell.go b/shell/shell.go
index 71da6587..b39e952c 100644
--- a/shell/shell.go
+++ b/shell/shell.go
@@ -93,6 +93,17 @@ func (opts *ShellOptions) Show(key string) (bool, string) {
 	}
 }
 
+// ShowConfig shows a config value from the shell controller
+func (sc *ShellController) ShowConfig(key string) (bool, string) {
+	switch key {
+	case "ttable-mem-fraction":
+		val := sc.config.GetFloat64(config.ConfigTtableMemFraction)
+		return true, fmt.Sprintf("%.2f (%.0f%% of memory)", val, val*100)
+	default:
+		return false, "No such config option: " + key
+	}
+}
+
 func (opts *ShellOptions) ToDisplayText() string {
 	keys := []string{"lexicon", "challenge", "lower", "board"}
 	out := strings.Builder{}
@@ -105,6 +116,21 @@ func (opts *ShellOptions) ToDisplayText() string {
 	return out.String()
 }
 
+// ToDisplayTextWithConfig includes both options and config settings
+func (sc *ShellController) ToDisplayTextWithConfig() string {
+	out := strings.Builder{}
+	out.WriteString(sc.options.ToDisplayText())
+
+	// Add config settings
+	configKeys := []string{"ttable-mem-fraction"}
+	for _, key := range configKeys {
+		_, val := sc.ShowConfig(key)
+		out.WriteString("  " + key + ": ")
+		out.WriteString(val + "\n")
+	}
+	return out.String()
+}
+
 // VariationNode represents a position in the variation tree.
 // The tree structure allows exploring different move sequences from the same position.
 type VariationNode struct {
@@ -367,6 +393,21 @@ func (sc *ShellController) Set(key string, args []string) (string, error) {
 		} else {
 			err = errors.New("Valid options: 'true', 'false'")
 		}
+	case "ttable-mem-fraction":
+		val, err := strconv.ParseFloat(args[0], 64)
+		if err != nil {
+			err = errors.New("ttable-mem-fraction must be a number between 0 and 1")
+		} else if val <= 0 || val > 1 {
+			err = errors.New("ttable-mem-fraction must be between 0 and 1 (e.g., 0.25 for 25% of memory)")
+		} else {
+			sc.config.Set(config.ConfigTtableMemFraction, val)
+			err = sc.config.Write()
+			if err != nil {
+				log.Err(err).Msg("error-writing-config")
+			} else {
+				ret = fmt.Sprintf("%.2f (%.0f%% of memory)", val, val*100)
+			}
+		}
 	default:
 		err = errors.New("No such option: " + key)
 	}