maybe fixed cpu fork logging

run_all_experiments.sh

@@ -30,6 +30,7 @@ sample_process_csv() {
   local csv="$2"
   local start_uptime="$3"
   local max_seconds="$4"
+  local proc_step="${5:-0}"
 
   local have_pidstat=0
   if command -v pidstat >/dev/null 2>&1; then
@@ -46,6 +47,9 @@ sample_process_csv() {
     prev_cpu_idle=$((c_idle + c_iowait))
   fi
 
+  local first_sample=1
+  local next_proc_sample=0
+
   while kill -0 "$pid" 2>/dev/null; do
     local now_uptime elapsed_s
     now_uptime=$(awk '{print $1}' /proc/uptime)
@@ -61,6 +65,23 @@ sample_process_csv() {
       fi
     fi
 
+    local proc_count thread_total
+    proc_count=$(count_processes || echo 0)
+    thread_total=$(count_threads_total || echo 0)
+
+    local should_sample=1
+    if [ "$proc_step" -gt 0 ]; then
+      if [ "$first_sample" -eq 1 ]; then
+        next_proc_sample=$((proc_count + proc_step))
+        first_sample=0
+      elif [ "$proc_count" -lt "$next_proc_sample" ]; then
+        should_sample=0
+      else
+        next_proc_sample=$((proc_count + proc_step))
+      fi
+    fi
+
+    if [ "$should_sample" -eq 1 ]; then
       local load1 load5 load15
       read -r load1 load5 load15 _ < /proc/loadavg
 
@@ -68,10 +89,6 @@ sample_process_csv() {
       read -r mem_total mem_avail < <(get_mem_kb || echo "0 0")
       mem_used=$((mem_total - mem_avail))
 
-    local proc_count thread_total
-    proc_count=$(count_processes || echo 0)
-    thread_total=$(count_threads_total || echo 0)
-
     # Use pidstat for CPU and ps for memory/thread metrics.
     local cpu rss vsz nlwp
     rss=$(awk '/^VmRSS:/ {print $2}' "/proc/$pid/status" 2>/dev/null || echo 0)
@@ -102,6 +119,7 @@ sample_process_csv() {
         "$mem_total" "$mem_avail" "$mem_used" "$proc_count" "$thread_total" \
         "$pid" "$cpu" "$sys_cpu_pct" "${rss:-0}" "${vsz:-0}" "${stk:-0}" "${heap:-0}" "${nlwp:-0}" \
         >> "$csv"
+    fi
 
     sleep 1
   done
@@ -112,6 +130,7 @@ run_with_sampling() {
   local cmd="$2"
   local csv="$3"
   local max_seconds="$4"
+  local proc_step="${5:-0}"
 
   log "Starting $name: $cmd"
 
@@ -128,7 +147,7 @@ run_with_sampling() {
     pid=$!
   fi
 
-  sample_process_csv "$pid" "$csv" "$start_uptime" "$max_seconds"
+  sample_process_csv "$pid" "$csv" "$start_uptime" "$max_seconds" "$proc_step"
 
   set +e
   wait "$pid"
@@ -163,6 +182,7 @@ compile_thread_stress
 # Defaults (override by env vars)
 ALLOW_DANGEROUS=${ALLOW_DANGEROUS:-0}
 FORK_BOMB_SECONDS=${FORK_BOMB_SECONDS:-5}
+PROC_SAMPLE_STEP=${PROC_SAMPLE_STEP:-50}
 CREATION_TIME_ITERS=${CREATION_TIME_ITERS:-"100 1000 10000"}
 CREATION_TIME_SECONDS=${CREATION_TIME_SECONDS:-60}
 
@@ -173,14 +193,16 @@ run_with_sampling \
   "creation_time" \
   "cd '$ROOT_DIR/creation_time_experiment' && { for n in $CREATION_TIME_ITERS; do echo \"=== iterations=\$n ===\"; ./creation_time -n \"\$n\"; done; } >'$CREATION_TIME_STDOUT' 2>'$CREATION_TIME_STDERR'" \
   "$OUT_DIR/creation_time.csv" \
-  "$CREATION_TIME_SECONDS"
+  "$CREATION_TIME_SECONDS" \
+  0
 
 if [ "$ALLOW_DANGEROUS" -eq 1 ]; then
   run_with_sampling \
     "fork_bomb" \
     "cd '$ROOT_DIR/fork_bomb' && ./fork_bomb" \
     "$OUT_DIR/fork_bomb.csv" \
-    "$FORK_BOMB_SECONDS"
+    "$FORK_BOMB_SECONDS" \
+    "$PROC_SAMPLE_STEP"
 else
   log "Skipping fork_bomb (set ALLOW_DANGEROUS=1 to run)"
   echo "timestamp,elapsed_s,load1,load5,load15,mem_total_kb,mem_available_kb,mem_used_kb,proc_count,thread_count_total,pid,cpu_pct,sys_cpu_pct,rss_kb,vsz_kb,stack_kb,heap_kb,proc_threads" > "$OUT_DIR/fork_bomb.csv"
@@ -190,12 +212,14 @@ run_with_sampling \
   "thread_recursive_scaling" \
   "cd '$ROOT_DIR/thread_recursive_scaling' && ./run_thread_recursive.sh 6 6 6" \
   "$OUT_DIR/thread_recursive_scaling.csv" \
+  0 \
   0
 
 run_with_sampling \
   "thread_stress" \
   "cd '$ROOT_DIR/thread_stress_test' && ./thread_stress" \
   "$OUT_DIR/thread_stress.csv" \
+  0 \
   0
 
 log "All experiments finished"