From 396b10dd5e206462ebeab5fed368ba3ae25c6a51 Mon Sep 17 00:00:00 2001
From: Peter Fors <peter.fors@mindkiller.com>
Date: Sat, 25 Oct 2025 21:56:37 +0200
Subject: Better benchmarking, some small optimizations

---
 Bench.sh | 48 +++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 41 insertions(+), 7 deletions(-)

(limited to 'Bench.sh')

diff --git a/Bench.sh b/Bench.sh
index 4a26ab5..157ad57 100755
--- a/Bench.sh
+++ b/Bench.sh
@@ -1,11 +1,45 @@
-#. ~/.local/bin/dev
+#!/usr/bin/env bash
 ./build.sh clean
 ./build.sh profile
 ./mknes
 ./build.sh profile_release
-taskset -c 1 chrt -f 99 -- perf stat -- ./mknes
-taskset -c 1 chrt -f 99 -- perf stat -- ./mknes
-taskset -c 1 chrt -f 99 -- perf stat -- ./mknes
-taskset -c 1 chrt -f 99 -- perf stat -e stalled-cycles-frontend:u -e L1-icache-loads -e L1-icache-load-misses -- ./mknes
-taskset -c 1 chrt -f 99 -- perf stat -e stalled-cycles-frontend:u -e L1-icache-loads -e L1-icache-load-misses -- ./mknes
-taskset -c 1 chrt -f 99 -- perf stat -e stalled-cycles-frontend:u -e L1-icache-loads -e L1-icache-load-misses -- ./mknes
+
+runs=10
+frames=4096
+events="cycles,instructions,task-clock"
+tmp=$(mktemp)
+
+taskset -c 1 ./mknes
+
+> "$tmp"
+for i in $(seq 1 $runs); do
+  taskset -c 1 chrt -f 99 perf stat -x, -e $events -- ./mknes 2>>"$tmp"
+done
+
+
+awk -F, -v F="$frames" '
+  $3=="cycles"        { c[++nc]=$1/F }
+  $3=="instructions"  { i[++ni]=$1/F }
+#   $3=="task-clock"    { t[++nt]=$1 }  # milliseconds NOTE(peter): changed to nanoseconds...
+  $3=="task-clock" { t[++nt]=$1/1000000 }
+
+  END {
+    for(k=1;k<=nc;k++) sumc+=c[k]; mc=sumc/nc
+    for(k=1;k<=ni;k++) sumi+=i[k]; mi=sumi/ni
+    for(k=1;k<=nt;k++) sumt+=t[k]; mt=sumt/nt
+
+    for(k=1;k<=nc;k++) sdc+=(c[k]-mc)^2; sdc=sqrt(sdc/(nc-1))
+    for(k=1;k<=ni;k++) sdi+=(i[k]-mi)^2; sdi=sqrt(sdi/(ni-1))
+    for(k=1;k<=nt;k++) sdt+=(t[k]-mt)^2; sdt=sqrt(sdt/(nt-1))
+
+    ms_per_frame = mt / F
+    fps = F / (mt / 1000)
+
+    printf "IPC (insn/cycle) = %.3f\n", mi/mc
+    printf "cycles/frame  mean=%.0f  sd=%.0f  relSD=%.3f%%  n=%d\n", mc, sdc, 100*sdc/mc, nc
+    printf "insn/frame    mean=%.0f  sd=%.0f  relSD=%.3f%%  n=%d\n", mi, sdi, 100*sdi/mi, ni
+    printf "time (ms)     mean=%.3f  sd=%.3f  relSD=%.3f%%  n=%d\n", mt, sdt, 100*sdt/mt, nt
+    printf "FPS (frames/second) = %.2f\n", fps
+    printf "ms/frame     = %.6f\n", ms_per_frame
+  }' "$tmp"
+
-- 
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