maybe fixed cpu fork logging

run_all_experiments.sh

@@ -78,14 +78,13 @@ sample_process_csv() {
       nlwp=$(awk '/^Threads:/ {print $2}' "/proc/$pid/status")
     fi
 
-    local cur_ticks dt dc cpu
-    cur_ticks=$prev_ticks
-    if [ -r "/proc/$pid/stat" ]; then
-      cur_ticks=$(awk '{print $14 + $15}' "/proc/$pid/stat")
+    # Use ps directly to avoid zero deltas for very short-lived processes.
+    local cpu
+    if command -v ps >/dev/null 2>&1; then
+      cpu=$(ps -o %cpu= -p "$pid" 2>/dev/null | awk '{print $1}' || true)
+    else
+      cpu=0.00
     fi
-    dt=$(awk -v a="$prev_uptime" -v b="$now_uptime" 'BEGIN{print b-a}')
-    dc=$(awk -v a="$prev_ticks" -v b="$cur_ticks" 'BEGIN{print b-a}')
-    cpu=$(awk -v dt="$dt" -v dc="$dc" -v hz="$clk_tck" 'BEGIN{ if (dt<=0) printf "0.00"; else printf "%.2f", (100.0*dc)/(dt*hz) }')
 
     printf "%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s\n" \
       "$(date -Iseconds)" "$elapsed_s" "$load1" "$load5" "$load15" \
@@ -94,7 +93,6 @@ sample_process_csv() {
       >> "$csv"
 
     prev_uptime=$now_uptime
-    prev_ticks=$cur_ticks
     sleep 1
   done
 }