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13
4a1s/CP/PL - Aula 7.md
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@ -1,4 +1,7 @@
25 Outubro 2023
---
dg-publish: true
---
25 Outubro 2023 - #CP
---
# Ficha 6
@ -547,12 +550,15 @@ Versão original:
Dot is 1.2020569031095949
```
### a)
### a+b)
Run \#1 (--cpus-per-task=2):
```
Dot is 1.2020569029595982
```
With the same cpus per task (cores), the result may vary depending on how
Run \#2 (--cpus-per-task=4):
```
Dot is 0.0000000005999720
@ -563,5 +569,6 @@ Run \#3 (--cpus-per-task=6):
Dot is 0.0000000013500135
```
Varies with the number of cpus per task (cores) because depending on the number of threads, the distribution of the instruction ```dot += a[i]*b[i];'``` per thread will vary, aka the value i will constantly vary, making the memory space alternate between versions.
Varies with the number of cpus per task (cores) because depending on the number of threads, the distribution of the instruction ```dot += a[i]*b[i];``` per thread will vary, aka the value ```i``` will constantly vary, making the memory space alternate between versions.
### c)