More explicit headings and sub-headings

lectures/memory-hierarchies/slides.qmd

@@ -63,7 +63,7 @@ Based on figure from "Computer Architecture" by _J. Hennessy_ and _D. Patterson_
 
 
 
-## Access time example (1/2) {.leftalign}
+## Disk I/O timings {.leftalign}
 
 <!--
 File `data.py`:
@@ -184,7 +184,7 @@ $^*$: Lower than one due to caching effects
 
 
 
-## Access time example (2/2) {.leftalign}
+## Disk I/O {.leftalign}
 
  - Reading/writing to file is rather expensive
  - If necessary during computation, try doing it asynchronously
@@ -200,6 +200,7 @@ $^*$: Lower than one due to caching effects
 
 ## First model version
 
+One layer of RAM cache between the CPU and the disk.
 
 :::{.r-stack}
 
@@ -224,6 +225,7 @@ $^*$: Lower than one due to caching effects
 
 ## Second model version
 
+Three layers of caches
 
 :::{.r-stack}
 
@@ -270,7 +272,7 @@ T_{avg,s} &= H_1 T_1 + ((1-H_1)\cdot H_2)\cdot(T_1+T_2)\\
 # Processor techniques
 
 
-## Third model version
+## The general view
 
 
 :::{.r-stack}