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4a1s/CP/PL - Aula 4.md
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---
dg-publish: true
---
4 de Outubro 2023 - #CP
## Ex. 2
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## Ex. 3
#### a)
2 operações em FP
#### a) Peak Performance
2 operações em FP
4 elementos de cada vez em cada ciclo
2.5 GHz -> 2.5 billion cycles per second
conclusion: 20 GFlop/s
#### b)
peak with vectorization: 20 GFlop/s
peak without vectorization: 5 GFlop/s
memory bandwith limitation: 20 GFlop/s
real achievable performance:
measured performance:
#### c)
memory bandwith limitation
| GFlop/s | Flop/Byte |
| ------- | --------- |
| 0.125 | |
| 0.25 | |
| 0.5 | 10 |
| 1 | 20 |
| 2 | |
| 4 | |
| 8 | |