Add README for llama2-7B

MaxText/configs/a3/llama_2_7b/16vm.sh

@@ -37,6 +37,6 @@ export XLA_FLAGS="--xla_dump_to=$OUTPUT_PATH/$RUN_NAME/HLO_dumps/
 
 # 16 nodes
 python MaxText/train.py MaxText/configs/base.yml run_name=$RUN_NAME hardware=gpu \
-    steps=30 dcn_data_parallelism=16 ici_fsdp_parallelism=8 per_device_batch_size=6 max_target_length=4096 model_name=llama2-7b \
+    steps=30 dcn_data_parallelism=16 ici_fsdp_parallelism=8 per_device_batch_size=4 max_target_length=4096 model_name=llama2-7b \
     enable_checkpointing=false attention=cudnn_flash_te remat_policy=minimal_flash use_iota_embed=true scan_layers=false \
     dataset_type=synthetic async_checkpointing=false base_output_directory=gs://runner-maxtext-logs enable_profiler=true

MaxText/configs/a3/llama_2_7b/README.md

@@ -0,0 +1,28 @@
+<!--
+ Copyright 2023 Google LLC
+
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+      https://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+ -->
+
+# High Performance Model Configs on A3 GPU
+Expected performance results for Llama2-7B model running on A3 GPU:
+
+
+### Llama2-7B
+| Hardware               | TFLOP/sec/chip   |
+| ---------------------- | ---------------- |
+| 1x A3 (h100-80gb-8)    | 492              |
+| 2x A3 (h100-80gb-8)    | 422              |
+| 4x A3 (h100-80gb-8)    | 407              |
+| 8x A3 (h100-80gb-8)    | 409              |
+| 16x A3 (h100-80gb-8)   | 375              |