slides

1 files changed, 24 insertions, 0 deletions

diff --git a/presentation/slides.tex b/presentation/slides.tex
index 59e86b3..907df20 100644
--- a/presentation/slides.tex
+++ b/presentation/slides.tex
@@ -637,6 +637,30 @@ Blockchain?
 
 \begin{frame}
 \frametitle{Experiments / Performance}
+  \begin{itemize}
+    \item Wallet: Most operations take in the order of 10s of milliseconds per
+      coin, even on semi-recent android phones
+    \item How many coins consitute one ``transaction''?  How many / what kind of refreshes per transaction?
+    \begin{itemize}
+      \item Depends on denominations, coin selection, typical amounts
+      \item Results from naive simulation (denominations $2^0,\dots,2^12$, uniform random spends $4-5000$)
+      \item $8.3$ spend operations, $1.3$ refresh operations with $4.2$ outputs
+    \end{itemize}
+    \item Benchmarks done on 96-core AMD EPYC 7451 CPU with 256GiB DDR42667 MHz
+      RAM
+  \end{itemize}
+\end{frame}
+
+\begin{frame}
+\frametitle{Experiments / Performance}
+  \begin{itemize}
+    \item \textit{taler-exchange-benchmark}: Testbed with parallel clients and one exchange
+    \item $\Rightarrow$ CPU / network bandwidth dominated by refreshing
+    \item $\Rightarrow$ $\approx 1/2$ of time spent in cryptographic operations
+    \item $\Rightarrow$ Many db tx conflicts observed leading to retries, potential for some optimization
+    \item $\Rightarrow$ Pessimistic assumptions:  $230$ transactions/second on one machine
+    \item $\Rightarrow$ Fixed microtransactions:  $1560$ transactions/second on one machine
+  \end{itemize}
 \end{frame}
 
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