simple mode tool reason (#3984)

* simple mode tool reason

* model config cannot set empty

* perf: read files code

* perf: mongo gridfs chunks

* perf: doc

packages/service/common/file/gridfs/controller.ts

@@ -52,7 +52,9 @@ export async function uploadFile({
   const stats = await fsp.stat(path);
   if (!stats.isFile()) return Promise.reject(`${path} is not a file`);
 
-  const readStream = fs.createReadStream(path);
+  const readStream = fs.createReadStream(path, {
+    highWaterMark: 256 * 1024
+  });
 
   // Add default metadata
   metadata.teamId = teamId;
@@ -62,9 +64,27 @@ export async function uploadFile({
   // create a gridfs bucket
   const bucket = getGridBucket(bucketName);
 
+  const fileSize = stats.size;
+  const chunkSizeBytes = (() => {
+    // 计算理想块大小：文件大小 ÷ 目标块数(10)
+    const idealChunkSize = Math.ceil(fileSize / 10);
+
+    // 确保块大小至少为512KB
+    const minChunkSize = 512 * 1024; // 512KB
+
+    // 取理想块大小和最小块大小中的较大值
+    let chunkSize = Math.max(idealChunkSize, minChunkSize);
+
+    // 将块大小向上取整到最接近的64KB的倍数，使其更整齐
+    chunkSize = Math.ceil(chunkSize / (64 * 1024)) * (64 * 1024);
+
+    return chunkSize;
+  })();
+
   const stream = bucket.openUploadStream(filename, {
     metadata,
-    contentType
+    contentType,
+    chunkSizeBytes
   });
 
   // save to gridfs