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Course contents

  • Architecture Metrics Reference
  • Workload Taxonomy for Architects
  • Architecture Glossary
  • Computer Architecture Cheatsheet
  • Pipeline Fundamentals14
    • Pipeline Throughput
    • Branch Prediction and Fetch
    • Out-of-Order Superscalar Execution
  • Memory Hierarchy15
  • NoC and Interconnect Architecture6
  • Coherency and Memory Ordering9
  • Performance Analysis9
  • Accelerator Architectures6
  • SoC Architecture Tradeoffs9
  • Architecture Interview Prep14
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‹Computer Architecture
  1. Topics
  2. Computer Architecture
  3. Pipeline Fundamentals

Computer Architecture · All levels

Pipeline Fundamentals

Pipeline stages, hazards, branch prediction, and out-of-order issue, and how each moves IPC.

  • 3topics
  • 14lessons

A pipelined processor overlaps fetch, decode, execute, memory, and commit across successive instructions. Throughput then depends on how often hazards, mispredicts, and issue limits insert bubbles.

Learning path through the pipeline topics.
Suggested order. Throughput first, then fetch, then out-of-order issue.

The three topics

Topic

Lessons

Description

Time

Pipeline Throughput

5

How five pipeline stages raise throughput, what hazards cost, and how forwarding and stalls recover IPC.

40 min

Branch Prediction and Fetch

4

How predictors feed fetch, what mispredicts cost in CPI, and how to debug them.

30 min

Out-of-Order Superscalar Execution

5

How wide issue, renaming and the reorder buffer raise IPC, and what caps the gain.

40 min

Tip

When IPC stays flat after a pipeline change, read the CPI stack first: frontend, branch, backend, and memory shares show where the bubbles enter before any width change.

Check yourself Why can a deeper pipeline run at a higher frequency yet retire fewer instructions per second?

Frequency sets cycles per second while IPC sets work per cycle, and deeper stages raise the cycle cost of each mispredict and hazard stall. If branch or dependency bubbles grow faster than frequency, IPC times frequency falls. The Pipeline Throughput topic covers stage depth, CPI arithmetic, and forwarding.

Interview

Typical interview questions from this part: how forwarding recovers data-hazard stalls, why MPKI beats accuracy percent, and why wider issue stops raising IPC.

Related topics

  • Up: Architecture course hub

  • Next: Memory Hierarchy

  • CPU Design course

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See also

  • Architecture Metrics Reference
  • Workload Taxonomy for Architects
  • Architecture Glossary