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Commit 94c2ce8a authored by Dominik Zobel's avatar Dominik Zobel
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Add chapters, intended takeaway and some reformatting

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lectures/memory-hierarchies/slides.qmd
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......@@ -11,6 +11,15 @@ author: "Dominik Zobel and Florian Ziemen"
## Intended Takeaways
- Locality matters: data-centric view
- Think workbench: Operating with parts of the data
- Processor tries to be busy all the time (prefetching)
- Latency and memory sizes of components
## Questions {.handson .incremental}
- Why not keep everything in memory?
......@@ -19,6 +28,8 @@ author: "Dominik Zobel and Florian Ziemen"
# Speed and access time
## Processor speed vs. memory speed
![](static/speed.png){width=70%}
......@@ -135,12 +146,12 @@ new_data = operate_on_data(data=data,
```
-->
| | Levante (Fixed) | Local (Fixed) | Levante (Random) | Local (Random) |
| | Levante (Fixed) | Laptop (Fixed) | Levante (Random) | Laptop (Random) |
| -------------------------- | ----------------- | ----------------- | ----------------- | ----------------- |
| Create data | 0.5607 | 0.2280 | 1.6623 | 0.8759 |
| Load data | 0.7605 | 0.8767 | 0.7615 | 0.9225 |
| Store data | 2.2317 | 4.0427 | 2.2327 | 3.4378 |
| Process data | 0.7618 | 0.3792 | 0.7572 | 0.3747 |
| Create data | 0.56 | 0.23 | 1.66 | 0.88 |
| Load data | 0.76 | 0.88 | 0.76 | 0.92 |
| Store data | 2.23 | 4.04 | 2.23 | 3.44 |
| Process data | 0.76 | 0.38 | 0.76 | 0.37 |
:::{.smaller}
Time in seconds using a 2 GB numpy array ($128 \times 128 \times 128 \times 128$) either with a fixed number or random number in each entry
......@@ -156,6 +167,9 @@ Time in seconds using a 2 GB numpy array ($128 \times 128 \times 128 \times 128$
# Theory
## Techniques
- Caching
......@@ -248,6 +262,8 @@ T_{avg,s} &= H_1 T_1 + ((1-H_1)\cdot H_2)\cdot(T_1+T_2)\\
# Visualizations
## Memory Pyramid (upwards)
......@@ -269,14 +285,25 @@ T_{avg,s} &= H_1 T_1 + ((1-H_1)\cdot H_2)\cdot(T_1+T_2)\\
## Memory Pyramid (downwards) - check numbers {auto-animate=true}
## Memory Pyramid (downwards) {auto-animate=true}
Order of magnitude on Levante (AMD EPYC 7763)
- Base frequency: 2.45 GHz
## Memory Pyramid (downwards) - check numbers {auto-animate=true}
## Memory Pyramid (downwards) {auto-animate=true}
::::::::{.r-stack}
:::{.normal style="color: #ffcccc; font-size: 3em; font-weight: bold; rotate: -30deg; opacity: 0.5;"}
Check numbers
:::
:::{.normal}
Order of magnitude on Levante (AMD EPYC 7763)
......@@ -284,6 +311,9 @@ Order of magnitude on Levante (AMD EPYC 7763)
------------ ----------------- ---------
Register ~0.4 1 KB
:::
::::::::
:::{.incremental}
......@@ -292,7 +322,17 @@ Register ~0.4 1 KB
:::
## Memory Pyramid (downwards) - check numbers {auto-animate=true}
## Memory Pyramid (downwards) {auto-animate=true}
::::::::{.r-stack}
:::{.normal style="color: #ffcccc; font-size: 3em; font-weight: bold; rotate: -30deg; opacity: 0.5;"}
Check numbers
:::
:::{.normal}
Order of magnitude on Levante (AMD EPYC 7763)
......@@ -301,6 +341,10 @@ Order of magnitude on Levante (AMD EPYC 7763)
Register ~0.4 1 KB
L1 Cache ~1.1 32 KB
:::
::::::::
:::{.incremental}
- Same factors for L2 and L3
......@@ -308,7 +352,17 @@ L1 Cache ~1.1 32 KB
:::
## Memory Pyramid (downwards) - check numbers {auto-animate=true}
## Memory Pyramid (downwards) {auto-animate=true}
::::::::{.r-stack}
:::{.normal style="color: #ffcccc; font-size: 3em; font-weight: bold; rotate: -30deg; opacity: 0.5;"}
Check numbers
:::
:::{.normal}
Order of magnitude on Levante (AMD EPYC 7763)
......@@ -319,6 +373,10 @@ L1 Cache ~1.1 32 KB
L2 Cache ~3.3 512 KB
L3 Cache ~12.8 32 MB
:::
::::::::
:::{.incremental}
- 256 GB of main memory (default) with a theoretical memory bandwidth of ~200 GB/s
......@@ -327,7 +385,17 @@ L3 Cache ~12.8 32 MB
## Memory Pyramid (downwards) - check numbers {auto-animate=true}
## Memory Pyramid (downwards) {auto-animate=true}
::::::::{.r-stack}
:::{.normal style="color: #ffcccc; font-size: 3em; font-weight: bold; rotate: -30deg; opacity: 0.5;"}
Check numbers
:::
:::{.normal}
Order of magnitude on Levante (AMD EPYC 7763)
......@@ -339,6 +407,10 @@ L2 Cache ~3.3 512 KB
L3 Cache ~12.8 32 MB
Main Memory 60 256 GB
:::
::::::::
:::{.incremental}
- Fast Data as Flash based file system
......@@ -347,7 +419,17 @@ Main Memory 60 256 GB
## Memory Pyramid (downwards) - check numbers {auto-animate=true}
## Memory Pyramid (downwards) {auto-animate=true}
::::::::{.r-stack}
:::{.normal style="color: #ffcccc; font-size: 3em; font-weight: bold; rotate: -30deg; opacity: 0.5;"}
Check numbers
:::
:::{.normal}
Order of magnitude on Levante (AMD EPYC 7763)
......@@ -358,7 +440,11 @@ L1 Cache ~1.1 32 KB
L2 Cache ~3.3 512 KB
L3 Cache ~12.8 32 MB
Main Memory 60 256 GB
SSD 100 1 PB
SSD 100 200 TB
:::
::::::::
:::{.incremental}
......@@ -368,7 +454,17 @@ SSD 100 1 PB
## Memory Pyramid (downwards) - check numbers {auto-animate=true}
## Memory Pyramid (downwards) {auto-animate=true}
::::::::{.r-stack}
:::{.normal style="color: #ffcccc; font-size: 3em; font-weight: bold; rotate: -30deg; opacity: 0.5;"}
Check numbers
:::
:::{.normal}
Order of magnitude on Levante (AMD EPYC 7763)
......@@ -379,15 +475,13 @@ L1 Cache ~1.1 32 KB
L2 Cache ~3.3 512 KB
L3 Cache ~12.8 32 MB
Main Memory ~60 256 GB
SSD ~100 1 PB
SSD ~100 200 TB
Hard disk ~3000 130 PB
:::{.incremental}
- Tape backup also possible
:::
::::::::
## Memory Mountain (1/2)
......
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