vault backup: 2023-10-25 12:31:34

.obsidian/workspace.json

@@ -4,11 +4,11 @@
     "type": "split",
     "children": [
       {
-        "id": "f2e5c2c113449b23",
+        "id": "e289691ce7e736ef",
         "type": "tabs",
         "children": [
           {
-            "id": "6a363953132aebe7",
+            "id": "abd7a3e8df397999",
             "type": "leaf",
             "state": {
               "type": "markdown",
@@ -158,10 +158,12 @@
       "digitalgarden:Digital Garden Publication Center": false
     }
   },
-  "active": "6a363953132aebe7",
+  "active": "3ca14d4a6c304083",
   "lastOpenFiles": [
     "4a1s/CP/PL - Aula 6.md",
     "4a1s/CP/PL - Aula 7.md",
+    "My Digital Garden.md",
+    "Images/Pasted image 20231018122801.png",
     "Excalidraw/Drawing 2023-10-25 12.16.38.excalidraw.md",
     "4a1s/MFES/T - Aula 2.md",
     "4a1s/MFES/PL - Aula 5.md",
@@ -172,8 +174,6 @@
     "4a1s/RAS/Notas Projeto RAS.md",
     "4a1s/CP/PL - Aula 4.md",
     "4a1s/CP/Projeto Fase 1.md",
-    "My Digital Garden.md",
-    "Pasted image 20231018122801.png",
     "Images/Pasted image 20231018121319.png",
     "Images/Pasted image 20231018120412.png",
     "Images/Pasted image 20231018120219.png",
@@ -196,7 +196,6 @@
     "Images",
     "4a1s/CP/PL - Aula 3.md",
     "4a1s/CP/PL - Aula 2.md",
-    "4a1s/RAS/Projeto.md",
     "4a1s/ESR",
     "Private-Project",
     "4a1s/Excalidraw/RAS",

4a1s/CP/PL - Aula 7.md

@@ -557,7 +557,12 @@ 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 \#n (--cpus-per-task=2):
+```
+Dot is 0.0000000001499965
+```
+With the same cpus per task (cores), the result may vary depending on how each threads randomly "picks up" the iterations of the for.
+
 
 Run \#2 (--cpus-per-task=4):
 ```
@@ -569,6 +574,18 @@ Run \#3 (--cpus-per-task=6):
 Dot is 0.0000000013500135
 ```
 
+Run \#4 (--cpus-per-task=8):
+```
+Dot is 0.0000000000719980
+```
+
+
 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)
+We can change the code to:
+
+And the results will always be:
+
+### d)
+We can use _reduction_ to do that.