parallelism-guide

Complete guide to parallelism in Megatron-Core: when to use each strategy, performance characteristics, and configuration examples.

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Content

# Parallelism Strategies Guide

Complete guide to parallelism in Megatron-Core: when to use each strategy, performance characteristics, and configuration examples.

## Parallelism Types

### 1. Data Parallel (DP)

**How it works**: Replicate full model on each GPU, split data batches, synchronize gradients.

**Memory**: Low efficiency - full model replication
**Communication**: Low - only gradients (all-reduce)
**Scalability**: Good for small models

**When to use**:
- Models <1B parameters that fit on single GPU
- Plenty of GPUs available
- Limited model complexity

**Configuration**:
```bash

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