# Parallel Execution

> Execute multiple independent tasks simultaneously using parallel agent coordination to maximize throughput. Use when tasks have no dependencies, results can be aggregated, and agents are available for concurrent work. Use when this capability is needed.

- Skill: `tomevault-io/parallel-execution-5` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add tomevault-io/parallel-execution-5`
- Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/parallel-execution-5/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: AI & ML
- Author: tomevault-io (https://skillmd.com/u/tomevault-io)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/tomevault-io/parallel-execution-5

---


# Parallel Execution

Execute multiple independent tasks simultaneously to maximize throughput and minimize total execution time.

## When to Use

- Multiple independent tasks (no dependencies)
- Tasks benefit from concurrent execution
- Maximizing throughput is priority
- Available agents for parallel work
- Results can be aggregated after completion

## Core Concepts

### Independence

**Tasks are independent when**:
- ✓ No data dependencies
- ✓ No resource conflicts
- ✓ No ordering requirements
- ✓ Failures are isolated

### Concurrency

**Critical**: Use **single message** with **multiple Task tool calls**:

```markdown
[Task tool] → Agent A
[Task tool] → Agent B
[Task tool] → Agent C

All start simultaneously.
```

## Execution Patterns

| Pattern | Description | Example |
|---------|-------------|---------|
| Homogeneous | Same agent, different inputs | Test 3 modules |
| Heterogeneous | Different agents, related task | Review + Test + Profile |
| Parallel + Convergence | Parallel → Synthesize | Profile + Analyze → Root cause |

## Synchronization Strategies

- **Wait for All**: Proceed when ALL complete
- **Wait for Any**: Early termination on first success
- **Threshold**: Proceed when N of M complete

## Performance

```
Sequential: T1 + T2 + T3
Parallel: max(T1, T2, T3)
Speedup = Sequential / Parallel
```

**Example**: 3 tasks (10+15+8 min) → Parallel (15 min) = 2.2x faster

## Best Practices

✓ Verify independence before parallelizing
✓ Use single message with multiple Task calls
✓ Balance workload across agents
✓ Handle failures gracefully

✗ Don't parallelize dependent tasks
✗ Don't send sequential messages

---
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<!-- tomevault:4.0:skill_md:2026-04-13 -->