Added threads graphic

lectures/parallelism/slides.qmd

@@ -67,15 +67,41 @@ Credit: MPI-M
 * A popular way to parallelize code
 * Pragma-based parallelization API
   * You annotate your code with parallel regions and the compiler does the rest
+
+```c++
+#pragma omp parallel for
+    for (int i = 0; i < N; ++i)
+        a[i] = 2 * i;
+```
+
+# OpenMP threads
+
 * OpenMP uses something called threads
   * Wait until next week for a definition
 
+:::: {.columns}
+
+::: {.column width="50%"}
+
+<br>
+
 ```c++
+N = 8
 #pragma omp parallel for
     for (int i = 0; i < N; ++i)
         a[i] = 2 * i;
 ```
 
+:::
+
+::: {.column width="50%"}
+
+![](static/threads.jpg){width=100%}
+
+:::
+
+::::
+
 # Hands-on Session! {background-color=var(--dark-bg-color) .leftalign}
 1. Load the GNU compiler on Levante
 ```bash