refactor add proc function

wrappers/proctrac.py

@@ -43,12 +43,13 @@ def from_proc(cls, jobid: int, proc: psutil.Popen) -> "TraceInfo":
             job_id=jobid,
         )
 
-    def merge(self, trace_info: "TraceInfo"):
-        self.cpus += trace_info.cpus
-        self.threads += trace_info.threads
-        self.mem += trace_info.mem
-        self.read_bytes += trace_info.read_bytes
-        self.write_bytes += trace_info.write_bytes
+    def add_subproc(self, proc: psutil.Popen):
+        io_counters = proc.io_counters()
+        self.cpus += proc.cpu_percent(0.1)
+        self.threads += proc.num_threads()
+        self.mem += proc.memory_info().rss
+        self.read_bytes += io_counters.read_bytes
+        self.write_bytes += io_counters.write_bytes
 
 
 class ProcWrapper:
@@ -73,8 +74,7 @@ def poll_info(self) -> Generator[TraceInfo, None, None]:
             start = datetime.now()
             for p in self.proc.children(True):
                 try:
-                    child_trace = TraceInfo.from_proc(self.jobid, p)
-                    trace.merge(child_trace)
+                    trace.add_subproc(p)
                 except psutil.Error as e:
                     print(f"failed to poll child process with error {e}")
                     continue