# 5. Changing the Number of GPUs

Let's rerun the fine-tuning task with a different number of GPUs. MoAI Platform abstracts GPU resources into a single accelerator and automatically performs parallel processing. Therefore, there is no need to modify the PyTorch script even when changing the number of GPUs.

# Changing the Accelerator type

Switch the accelerator type using the moreh-switch-model tool. For instructions on changing the accelerator, please refer to the 3. Model fine-tuning

$ moreh-switch-model

Please contact your infrastructure provider and choose one of the following options before proceeding.

AMD MI250 GPU with 32 units
- When using Moreh's trial container: select 8xlarge
- When using KT Cloud's Hyperscale AI Computing: select 8xLarge.4096GB
AMD MI210 GPU with 64 units
AMD MI300X GPU with 16 units

# Training Parameters

Since the available GPU memory has doubled, let's increase the batch size from the previous 256 to 512 and run the code again.

~/moreh-quickstart$ python tutorial/train_mistral.py --batch-size 512

If the training proceeds normally, you should see the following logs:

[info] Requesting resources for MoAI Accelerator from the server...
[info] Initializing the worker daemon for MoAI Accelerator
[info] [1/8] Connecting to resources on the server (192.168.xxx.xx:xxxxx)...
[info] [2/8] Connecting to resources on the server (192.168.xxx.xx:xxxxx)...
[info] [3/8] Connecting to resources on the server (192.168.xxx.xx:xxxxx)...
[info] [4/8] Connecting to resources on the server (192.168.xxx.xx:xxxxx)...
[info] [5/8] Connecting to resources on the server (192.168.xxx.xx:xxxxx)...
[info] [6/8] Connecting to resources on the server (192.168.xxx.xx:xxxxx)...
[info] [7/8] Connecting to resources on the server (192.168.xxx.xx:xxxxx)...
[info] [8/8] Connecting to resources on the server (192.168.xxx.xx:xxxxx)...
[info] Establishing links to the resources...
[info] MoAI Accelerator is ready to use.
[info] Moreh Version: 24.11.0
[info] Moreh Job ID: 991505
[info] The number of candidates is 96.
[info] Parallel Graph Compile start...
[info] Elapsed Time to compile all candidates = 88241 [ms]
[info] Parallel Graph Compile finished.
[info] The number of possible candidates is 39.
[info] SelectBestGraphFromCandidates start...
[info] Elapsed Time to compute cost for survived candidates = 19172 [ms]
[info] SelectBestGraphFromCandidates finished.
[info] Configuration for parallelism is selected.
[info] No PP, No TP,  recomputation : default(1), distribute_param : true, distribute_low_prec_param : false
[info] train: true
...
| INFO     | __main__:main:250 - Model load and warmup done. Duration: 390.69
| INFO     | __main__:main:260 - [Step 10/34] | Loss: 0.609375 | Duration: 63.03 | Throughput: 74864.85 tokens/sec
| INFO     | __main__:main:260 - [Step 20/34] | Loss: 0.55078125 | Duration: 66.88 | Throughput: 78395.51 tokens/sec
| INFO     | __main__:main:260 - [Step 30/34] | Loss: 0.5546875 | Duration: 67.86 | Throughput: 77265.73 tokens/sec
...

Compared to the previous execution results when the number of GPUs was half, you can see that the learning is the same and the throughput has improved.

When using AMD MI250 GPU 16 → 32 : approximately 35,000 tokens/sec → 77,000 tokens/sec

tutorial mistral