Solutions Engineer

If you’re training or deploying large AI models, real-time performance is mission-critical. Whether you’re running a chatbot, a recommendation engine, or high-throughput image classification, users expect instant responses.

**That’s where RunPod’s instant clusters come in.**

Instant clusters provide near-instant provisioning of networked, multi-node GPU environments, with performance and flexibility traditional clusters can’t match.

This guide walks through what instant clusters are, why they’re ideal for real-time inference, and how to deploy them quickly using RunPod’s UI, CLI, or API.

## What Are Instant Clusters for Real-Time Inference?

RunPod’s instant clusters are multi-node GPU environments that boot in seconds and scale elastically, without long-term commitments. They’re designed for latency-sensitive workloads where every millisecond counts.

Think of instant clusters as networked multi-node GPU environments with high-speed connections for scaling AI workloads across multiple machines when your needs outgrow a single machine. This is especially crucial for real-time inference tasks, where immediate responses are essential to user experience.

Unlike traditional cluster deployments (which can take days or weeks), instant clusters have the following key features:

| Feature | Details |
| ----- | ----- |
| Boot time | 37 seconds (PyTorch) |
| Scale | 16 to 64 GPUs across nodes |
| Networking | 800–3200 Gbps node-to-node bandwidth |
| Pod IPs | Static IP assignment per pod |
| Workload support | Run any Docker container |
| Billing | Per-second pricing, no contracts or minimum commitments |

These features make instant clusters excel with fluctuating workloads and event-driven inference scenarios, allowing you to allocate resources only when needed.

## Why Use Instant Clusters for Real-Time Inference?

RunPod’s instant clusters are built to launch fast, scale smart, and deliver real-time results—without infrastructure delays.

Traditional infrastructure deployment can't keep pace with these demands, which is where instant clusters for real-time inference excel.

### Ultra-low latency and high throughput

Real-time AI requires infrastructure that can keep up. Instant clusters offer:

* **Fast spin-up:** Deploy in minutes vs. days with traditional providers  
* **Minimal cold starts:** Boot a PyTorch environment in \~37 seconds  
* **High-speed networking:** 800–3200 Gbps east-west bandwidth  
* **Throughput wins:** One organization improved image inference from 1,000 to 15,000 images per second and dropped latency from 100ms to 15ms

### Pay only for what you use

Cost efficiency matters, especially for bursty or unpredictable inference traffic:

* **Per-second billing**: Pay only for what you use, with no minimum commitments.  
* **Competitive pricing**: H100 GPUs cost about $3.58/hour versus $8+/hour elsewhere.  
* **Scale as needed**: Expand during traffic spikes and contract during quiet periods.  
* **No idle costs**: A [case study by RunPod](https://blog.runpod.io/why-run-gpu-workloads-in-the-cloud-over-your-own-cluster/) showed 50.3% cost savings over three years compared to on-premises deployment—over $124,000 saved.

### Scale seamlessly from dev to production

Instant clusters are built for experimentation *and* production:

* **Test freely**: Deploy resources without long-term financial commitments.  
* **Grow smoothly**: Scale from small experiments to full production deployments.  
* **Run anything**: Support for quick proof-of-concept tests and mission-critical workloads.  
* **Choose your hardware**: Access NVIDIA H100s without outright purchase.

This flexibility democratizes access to serious computational resources for organizations of all sizes, removing long provisioning times, rigid contracts, and huge upfront costs.

## How to use instant clusters for real-time inference on RunPod

You can launch instant clusters through the UI, CLI, or API. Here’s how:

### Using the RunPod UI

1. Log into your [RunPod account](https://www.runpod.io) and go to Instant Clusters  
2. Click “Create New Cluster”  
3. Configure your cluster:  
   * Select number of nodes (2–8)  
   * Choose GPUs per node (up to 8\)  
   * Pick GPU type (e.g., H100)  
   * Choose a container image or template  
   * Configure storage and networking  
   * Set auto-shutdown rules (e.g., based on idle GPU time)  
4. Set up networking:  
   * Enable public networking if needed.  
   * Configure ports to expose.  
   * Note the high-speed node connections.  
5. Configure auto-shutdown settings:  
   * Set idle timeout to save money.  
   * Set automatic shutdown based on GPU utilization.  
6. Review and launch your cluster.  
7. Once deployed (typically around 37 seconds), receive connection details.

The RunPod dashboard displays all running nodes with real-time GPU utilization, memory usage, and costs.

### Using the RunPod CLI

```
# Install the RunPod CLI
pip install runpod

# Authenticate
runpod login

# Create an instant cluster for real-time inference
runpod cluster create \
  --name "inference-cluster" \
  --nodes 2 \
  --gpus-per-node 4 \
  --gpu-type "NVIDIA H100" \
  --container-image "runpod/pytorch:2.0.1-py3.10-cuda11.8.0-devel" \
  --volume-id "vol-12345" \
  --exposed-ports "8000,8080"
```

### Using the RunPod API

```py
import requests
import json

API_KEY = "your_api_key"
headers = {
    "Authorization": f"Bearer {API_KEY}",
    "Content-Type": "application/json"
}

cluster_config = {
    "name": "inference-cluster",
    "nodeCount": 2,
    "gpusPerNode": 4,
    "gpuType": "NVIDIA H100",
    "containerImage": "runpod/pytorch:2.0.1-py3.10-cuda11.8.0-devel",
    "volumeId": "vol-12345",
    "exposedPorts": ["8000", "8080"],
    "autoShutdownIdle": 15
}

response = requests.post(
    "https://api.runpod.io/v2/clusters",
    headers=headers,
    data=json.dumps(cluster_config)
)

print(response.json())
```

These methods work well for teams that need to create and remove inference infrastructure as part of CI/CD pipelines or scheduled workloads.

## Best practices for real-time inference

Instant clusters give you raw power on demand, but to get the most out of them for real-time workloads, it pays to optimize.

Here are some proven best practices to fine-tune performance, reduce costs, and avoid common bottlenecks:

### **GPU selection**

Choose GPUs that match your workload. H100s are ideal for high-throughput, low-latency inference across large models.

### **Optimize your container**

* Use multi-stage Docker builds  
* Pre-download model weights  
* Remove unneeded dependencies  
* Use inference-optimized base images

### **Speed up inference**

* Use TensorRT or ONNX to convert and optimize models  
* Batch requests to reduce processing overhead

### **Networking and scaling**

* Use WebSockets for streaming responses  
* Consider Nginx for load balancing  
* Use aggressive auto-shutdown rules to save on costs  
* Scale based on GPU utilization or request throughput

### **Logging and monitoring**

* Monitor GPU usage and latency in the dashboard  
* Log all inbound requests and responses  
* Set alerts for anomalies or unexpected slowdowns

### **Memory optimization**

* Use quantization or PagedAttention for large models  
* Tune batch size for optimal memory and performance tradeoffs

## Why RunPod is ideal for real-time inference

RunPod instant clusters are purpose-built for teams who need speed, flexibility, and GPU performance without infrastructure hassle.

**🚀 Flashboot provisioning:** Deploy in under 40 seconds

**💸 Affordable pricing:** H100s at $3.58/hr with per-second billing

**🛡 Secure & flexible environments:** Choose Secure Cloud or Community Cloud

**🛠 Developer-friendly tooling:** CLI, API, Docker, volume mounting, auto-shutdown

**📈 Seamless scaling:** Start with one GPU, scale to 64+ as needed

## Final thoughts

Real-time inference is one of the most demanding AI workloads, and **RunPod’s instant clusters are built to meet those demands**. Whether you’re experimenting with a new model or scaling a production endpoint, you can launch, optimize, and manage high-performance clusters with minimal friction.

**Ready to try it? [Deploy your first instant cluster now](https://www.runpod.io).**

How to Use RunPod Instant Clusters for Real-Time Inference