Add for readme interleave multiple host with ray (#114)

* add interleave multiple host with ray readme

* add interleave multiple host with ray readme

Author: FanhaiLu1

README.md

@@ -122,6 +122,41 @@ Optional flags:
 * `--sharding_config=<path>` This makes use of alternative sharding config instead of
   the ones in default_shardings directory.
 
+
+# Run the server with ray
+Below are steps run server with ray:
+1. Ssh to Cloud Multiple Host TPU VM (v5e-16 TPU VM)
+2. Step 2 to step 5 in Outline 
+3. Setup ray cluster 
+4. Run server with ray
+
+## Setup Ray Cluster 
+Login host 0 VM, start ray head with below command: 
+
+```bash
+
+ray start --head
+
+```
+
+Login other host VMs, start ray head with below command:
+
+```bash
+
+ray start --address='$ip:$port'
+
+```
+
+Note: Get address ip and port information from ray head.
+
+## Run server with ray
+
+Here is an example to run the server with ray for llama2 7B model:
+
+```bash
+python run_server_with_ray.py --tpu_chips=16 -model_name=$model_name --size=7b --batch_size=96 --max_cache_length=2048 --quantize_weights=$quantize --quantize_type=$quantize_type --quantize_kv_cache=$quantize --checkpoint_path=$output_ckpt_dir   --tokenizer_path=$tokenizer_path --sharding_config="default_shardings/llama.yaml"
+```
+
 # Run benchmark
 Start the server and then go to the deps/JetStream folder (downloaded during `install_everything.sh`)