osu: add figure for latency tests

garlic/fig/index.nix

@@ -40,4 +40,16 @@ in
   creams = with exp.creams; {
     ss = rPlotExp ./creams/ss.R [ ss.hybrid ss.pure ];
   };
+
+  osu = with exp.osu; {
+    #latency = pp.osu-latency latency.result;
+    latency =
+    let
+      resultJson = pp.osu-latency latency.result;
+    in
+      rPlot {
+        script = ./osu/latency.R;
+        dataset = resultJson;
+      };
+  };
 }

garlic/fig/osu/latency.R

@@ -0,0 +1,43 @@
+library(ggplot2)
+library(dplyr)
+library(scales)
+library(jsonlite)
+
+args=commandArgs(trailingOnly=TRUE)
+
+# Read the timetable from args[1]
+input_file = "input.json"
+if (length(args)>0) { input_file = args[1] }
+
+# Load the dataset in NDJSON format
+dataset = jsonlite::stream_in(file(input_file)) %>%
+	jsonlite::flatten()
+
+# We only need the nblocks and time
+df = select(dataset, config.unitName, size, latency) %>%
+	rename(unitName=config.unitName)
+
+df$unitName = as.factor(df$unitName)
+df$sizeFactor = as.factor(df$size)
+
+ppi=300
+h=8
+w=12
+
+png("latency.png", width=w*ppi, height=h*ppi, res=ppi)
+
+p = ggplot(data=df, aes(x=size, y=latency)) +
+	labs(x="Size (bytes)", y="Latency (us)",
+              title="OSU latency benchmark", 
+              subtitle=input_file) +
+	geom_boxplot(aes(color=unitName, group=interaction(unitName, sizeFactor))) +
+	scale_y_continuous(trans=log10_trans()) +
+	scale_x_continuous(trans=log2_trans()) +
+	theme_bw() +
+	theme(legend.position = c(0.15, 0.9))
+
+# Render the plot
+print(p)
+
+## Save the png image
+dev.off()