maybe fixed cpu fork logging

run_all_experiments.sh

@@ -14,19 +14,11 @@ log() {
 }
 
 count_processes() {
-  if command -v ps >/dev/null 2>&1; then
-    ps -e -o pid= 2>/dev/null | wc -l
-  else
-    echo 0
-  fi
+  ls -d /proc/[0-9]* 2>/dev/null | wc -l
 }
 
 count_threads_total() {
-  if command -v ps >/dev/null 2>&1; then
-    ps -e -o nlwp= 2>/dev/null | awk '{sum+=$1} END {print sum+0}'
-  else
-    echo 0
-  fi
+  awk '/^Threads:/ {sum+=$2} END {print sum+0}' /proc/[0-9]*/status 2>/dev/null || echo 0
 }
 
 get_mem_kb() {
@@ -74,17 +66,9 @@ sample_process_csv() {
 
     # Use pidstat for CPU and ps for memory/thread metrics.
     local cpu rss vsz nlwp
-    if command -v ps >/dev/null 2>&1; then
-      read -r cpu rss vsz nlwp < <(ps -o %cpu=,rss=,vsz=,nlwp= -p "$pid" 2>/dev/null || echo "0 0 0 0")
-      cpu=${cpu:-0}
-      rss=${rss:-0}
-      vsz=${vsz:-0}
-      nlwp=${nlwp:-0}
-    else
-      rss=0
-      vsz=0
-      nlwp=0
-    fi
+    rss=$(awk '/^VmRSS:/ {print $2}' "/proc/$pid/status" 2>/dev/null || echo 0)
+    vsz=$(awk '/^VmSize:/ {print $2}' "/proc/$pid/status" 2>/dev/null || echo 0)
+    nlwp=$(awk '/^Threads:/ {print $2}' "/proc/$pid/status" 2>/dev/null || echo 0)
     if [ "$have_pidstat" -eq 1 ]; then
       cpu=$(pidstat -p "$pid" 1 1 2>/dev/null | awk -v p="$pid" '$1 ~ /^[0-9]/ && $3==p {print $8; exit}')
       cpu=${cpu:-0.00}