feat(slayerfs): add cache demo script

Signed-off-by: zine yu <[email protected]>

Author: zine0

project/slayerfs/doc/meta.md

@@ -137,4 +137,6 @@ database:
   url: "postgresql://postgres:[email protected]:5432/meta"
 ```
 
-​	目前，本地数据库模式下，在挂载后的文件夹中，可以正常操作文件夹，包括重命名，删除，读写文件之类的操作。
+​	目前，本地数据库模式下，在挂载后的文件夹中，可以正常操作文件夹，包括重命名，删除，读写文件之类的操作。
+
+运行script/cache_demo.sh 后可以在log中看到关于缓存命中、加入、移除等信息

project/slayerfs/examples/persistence_demo.rs

@@ -69,7 +69,8 @@ fn process_config_for_backend(
 
 #[tokio::main]
 async fn main() -> Result<(), Box<dyn std::error::Error>> {
-    env_logger::init();
+    let format = tracing_subscriber::fmt::format().with_ansi(false);
+    tracing_subscriber::fmt().event_format(format).init();
 
     #[cfg(not(target_os = "linux"))]
     {

project/slayerfs/scripts/cache_demo.sh

@@ -0,0 +1,45 @@
+#!/bin/bash
+# Simple script to demonstrate SlayerFS cache hits
+set -e
+
+CONFIG_FILE="sqlite.yml"
+LOG_FILE="cache_hits.log"
+
+echo "=== SlayerFS Cache Hit Demo ==="
+
+
+echo "Starting SlayerFS..."
+cargo run --example persistence_demo -- --config "$CONFIG_FILE" --mount "/tmp/mount" --storage "/tmp/sqlite" > "$LOG_FILE" 2>&1 &
+DEMO_PID=$!
+
+# Wait for mount
+sleep 3
+
+if ! mountpoint -q "/tmp/mount"; then
+    echo "Error: Mount failed"
+    exit 1
+fi
+
+echo "Filesystem mounted successfully!"
+
+# Create test files
+echo "Creating test files..."
+for i in {1..3}; do
+    echo "Content of file $i - $(date)" > "/tmp/mount/test$i.txt"
+done
+
+echo "Reading files multiple times to trigger cache hits..."
+for round in {1..3}; do
+    echo "Round $round:"
+    for i in {1..3}; do
+        cat "/tmp/mount/test$i.txt" > /dev/null
+    done
+    sleep 1
+done
+
+echo "Checking logs for cache messages..."
+echo "=== Cache-related messages ==="
+grep -i "cache\|hit\|remove\|chunks" "$LOG_FILE" | head -20
+
+echo ""
+echo "Demo completed. Full log saved to: $LOG_FILE"