0

Hello!

I'm working on a program at work for a device we are building, it's a device that (basically) in real-time reads in sensors, makes decisions about said data, and performs output. I have a loop that runs, and then calculates how long to sleep, so we can get as close as we can as possible to looping approx every second. It sends data over the internet to our servers where we have a web interface, and the ability to send commands back to the unit. It also runs a node server on the unit with a similar web interface.

The unit runs on a beaglebone black rev b6, which runs Debian 7 wheezy. I'm basically done programming all the features but I am noticing that the CPU Load average (as according to top) will run very high at times, escpecially when you access the node interface, but even when it's just chuggin along.

I incorporated cProfile to run an analysis on what is using CPU the most, and see if I can improve it's performance. I don't really understand all of what I am looking at here. How do I determine what needs to be improved? Where is the most CPU usage coming from in this cProfile output?

Any help would be appreciated. I've read a lot about cProfile, but it's just not clicking. Thanks

   ncalls  tottime  percall  cumtime  percall filename:lineno(function)
        1    0.000    0.000    0.000    0.000 {zip}
       13    0.002    0.000    0.002    0.000 {method '__contains__' of 'frozenset' objects}
     3240    0.014    0.000    0.014    0.000 {method 'readline' of 'cStringIO.StringO' objects}
        1    0.000    0.000    0.000    0.000 {_hashlib.openssl_sha1}
     3420    0.157    0.000    0.157    0.000 {method 'split' of 'str' objects}
        1    0.059    0.059    0.059    0.059 {wind.init_wind}
       24    0.002    0.000    0.002    0.000 {time.mktime}
     8866    0.052    0.000    0.052    0.000 {bin}
      405    2.176    0.005    2.176    0.005 {method 'splitlines' of 'str' objects}
     8866    0.335    0.000    0.335    0.000 {round}
        1    0.000    0.000    0.002    0.002 {method 'decode' of 'str' objects}
        8    0.001    0.000    0.001    0.000 {built-in method __new__ of type object at 0x1dba68}
     1615    0.055    0.000    0.055    0.000 {_struct.pack}
     1612    0.127    0.000    0.127    0.000 {fcntl.ioctl}
     1635    0.019    0.000    0.019    0.000 {method 'pop' of 'list' objects}
      403   43.103    0.107   43.103    0.107 {wind.speed}
        1    0.000    0.000    0.000    0.000 {method 'sort' of 'list' objects}
       40    0.001    0.000    0.001    0.000 {_sre.compile}
        1    0.000    0.000    0.000    0.000 {Adafruit_BBIO.UART.setup}
     1620    1.572    0.001    1.572    0.001 {method 'recv' of '_socket.socket' objects}
     1525    0.014    0.000    0.014    0.000 {method 'lower' of 'str' objects}
        1    0.000    0.000    0.000    0.000 {_hashlib.openssl_sha224}
        1    0.002    0.002    0.002    0.002 {posix.fork}
        2    0.000    0.000    0.000    0.000 {method 'acquire' of 'thread.lock' objects}
     3242    0.018    0.000    0.018    0.000 {posix.getpid}
        3    0.000    0.000    0.000    0.000 {method 'setter' of 'property' objects}
     1613    0.140    0.000    0.140    0.000 {termios.tcsetattr}
     1414    0.021    0.000    0.021    0.000 {chr}
        8    0.000    0.000    0.000    0.000 {method '__subclasses__' of 'type' objects}
        1    0.000    0.000    0.000    0.000 {function seed at 0x4a2a70}
     1615    0.075    0.000    0.075    0.000 {posix.close}
        1    0.000    0.000    0.000    0.000 {_ctypes.set_conversion_mode}
      808    0.091    0.000    0.091    0.000 {repr}
        1    0.000    0.000    0.000    0.000 {method 'strftime' of 'datetime.date' objects}
        1    0.000    0.000    0.000    0.000 {_hashlib.openssl_sha512}
      632    0.008    0.000    0.008    0.000 {method 'read' of 'cStringIO.StringI' objects}
     1620    2.165    0.001    2.165    0.001 {method 'sendall' of '_socket.socket' objects}
      127    0.003    0.000    0.003    0.000 {method 'rfind' of 'str' objects}
      247    0.002    0.000    0.002    0.000 {method 'format' of 'str' objects}
     6480    0.032    0.000    0.032    0.000 {method 'seek' of 'cStringIO.StringO' objects}
       25    0.000    0.000    0.000    0.000 {_struct.calcsize}
        1    0.000    0.000    0.000    0.000 {posix.urandom}
     1209    0.002    0.000    0.002    0.000 {id}
       86    0.000    0.000    0.000    0.000 {method 'isalnum' of 'str' objects}
       14    0.000    0.000    0.000    0.000 {globals}
       16    0.000    0.000    0.000    0.000 {built-in method fromkeys}
        1    0.004    0.004    0.004    0.004 {method 'connect' of '_socket.socket' objects}
       16    0.000    0.000    0.000    0.000 {method 'strip' of 'str' objects}
       42    0.000    0.000    0.000    0.000 {method 'group' of '_sre.SRE_Match' objects}
        1    0.000    0.000    0.000    0.000 {math.exp}
        1    0.000    0.000    0.000    0.000 {posix.WIFSIGNALED}
        8    0.000    0.000    0.000    0.000 {method '__subclasshook__' of 'object' objects}
     1612   29.368    0.018   29.368    0.018 {posix.write}
        1    0.000    0.000    0.000    0.000 {method 'insert' of 'list' objects}
        2    0.000    0.000    0.000    0.000 {_ctypes.POINTER}
       28    0.000    0.000    0.000    0.000 {max}
       13    0.000    0.000    0.001    0.000 {all}
       51    0.003    0.000    0.003    0.000 {method 'items' of 'dict' objects}
     1613    0.161    0.000    0.161    0.000 {termios.tcgetattr}
       13    0.000    0.000    0.000    0.000 {method 'isdigit' of 'str' objects}
        1    0.000    0.000    0.000    0.000 {posix.fdopen}
        5    0.000    0.000    0.000    0.000 {thread.allocate_lock}
     1620    0.013    0.000    0.013    0.000 {method 'write' of 'cStringIO.StringO' objects}
        1    0.000    0.000    0.000    0.000 {math.sqrt}
      517    0.060    0.000    0.060    0.000 {posix.stat}
     9723    0.073    0.000    0.078    0.000 {hasattr}
     1613    0.076    0.000    0.076    0.000 {posix.read}
        1    0.000    0.000    0.000    0.000 {posix.waitpid}
        1    0.000    0.000    0.000    0.000 {gc.disable}
        1    0.000    0.000    0.000    0.000 {method 'translate' of 'str' objects}
        2    0.000    0.000    0.000    0.000 {posix.pipe}
        1    0.002    0.002    0.002    0.002 {_socket.getaddrinfo}
       45    0.000    0.000    0.000    0.000 {method 'rstrip' of 'str' objects}
     1628    0.014    0.000    0.014    0.000 {method 'remove' of 'set' objects}
     6283    0.039    0.000    0.039    0.000 {method 'endswith' of 'str' objects}
      425    0.038    0.000    0.038    0.000 {method 'close' of 'file' objects}
      806    0.015    0.000    0.015    0.000 {method 'end' of '_sre.SRE_Match' objects}
      403    1.652    0.004    1.652    0.004 {method 'writelines' of 'file' objects}
    28522    0.246    0.000    0.246    0.000 {isinstance}
     1612    0.181    0.000    0.181    0.000 {method 'write' of 'file' objects}
       34    0.000    0.000    0.000    0.000 {_ctypes.sizeof}
        6    0.000    0.000    0.000    0.000 {method 'pop' of 'dict' objects}
     1655    0.012    0.000    0.012    0.000 {method 'add' of 'set' objects}
    28/17    0.000    0.000    0.006    0.000 {issubclass}
        2    0.000    0.000    0.000    0.000 {math.log}
        8    0.000    0.000    0.000    0.000 {fcntl.fcntl}
        1    0.000    0.000    0.000    0.000 {binascii.a2b_hex}
      509    0.014    0.000    0.014    0.000 {method 'startswith' of 'str' objects}
     8866    0.069    0.000    0.069    0.000 {method 'rjust' of 'str' objects}
    67704    0.550    0.000    0.550    0.000 {method 'zfill' of 'str' objects}
        1    0.000    0.000    0.000    0.000 {_hashlib.openssl_sha256}
     1612    0.077    0.000    0.077    0.000 {select.select}
       17    0.000    0.000    0.000    0.000 {imp.acquire_lock}
     1244    0.707    0.001    0.707    0.001 {method 'read' of 'file' objects}
        2    0.000    0.000    0.000    0.000 {sys._getframe}
        4    0.000    0.000    0.000    0.000 {method 'append' of 'bytearray' objects}
     1612    0.021    0.000    0.021    0.000 {method 'extend' of 'bytearray' objects}
        1    0.000    0.000    0.000    0.000 {posix.sysconf}
     1023    0.005    0.000    0.005    0.000 {method 'replace' of 'str' objects}
    95451    0.156    0.000    0.156    0.000 {ord}
        2    0.000    0.000    0.000    0.000 {thread.get_ident}
        4    0.012    0.003    0.012    0.003 {Adafruit_BBIO.GPIO.setup}
       17    0.000    0.000    0.000    0.000 {imp.release_lock}
      142    0.000    0.000    0.000    0.000 {method 'setdefault' of 'dict' objects}
        2    0.008    0.004    0.008    0.004 {imp.load_dynamic}
       24    0.001    0.000    0.001    0.000 {method 'seek' of 'file' objects}
       24    0.003    0.000    0.003    0.000 {posix.access}
       64    0.000    0.000    0.000    0.000 {_sre.getlower}
        1    0.000    0.000    0.000    0.000 {binascii.hexlify}
      404   11.793    0.029   11.793    0.029 {posix.system}
        1    0.000    0.000    0.000    0.000 {posix.WEXITSTATUS}
        1    0.000    0.000    0.000    0.000 {gc.isenabled}
     6613    0.046    0.000    0.046    0.000 {getattr}
        1    0.000    0.000    0.000    0.000 {gc.enable}
       62    0.002    0.000    0.002    0.000 {posix.lstat}
        1    0.000    0.000    0.000    0.000 {method 'release' of 'thread.lock' objects}
        1    0.000    0.000    0.000    0.000 {method 'setsockopt' of '_socket.socket' objects}
     1613    0.304    0.000    0.304    0.000 {posix.open}
31958/31805    0.091    0.000    0.092    0.000 {len}
    10770    0.129    0.000    0.129    0.000 {range}
        1    0.000    0.000    0.000    0.000 {posix.getcwd}
        1    0.001    0.001    0.002    0.002 {__import__}
        1    0.000    0.000    0.000    0.000 {method 'copy' of 'dict' objects}
    95108    0.224    0.000    0.224    0.000 {hex}
     7836    0.499    0.000    1.601    0.000 {method 'join' of 'str' objects}
     1611    0.009    0.000    0.009    0.000 {time.time}
     2841    2.899    0.001    2.899    0.001 {open}
        4    0.000    0.000    0.096    0.024 {map}
        1    0.000    0.000    0.000    0.000 {_hashlib.openssl_md5}
      410    0.256    0.001    0.256    0.001 {Adafruit_BBIO.GPIO.output}
        6    0.000    0.000    0.000    0.000 {method 'tell' of 'file' objects}
      964    0.028    0.000    0.028    0.000 {method 'match' of '_sre.SRE_Pattern' objects}
       18    0.000    0.000    0.001    0.000 {method 'extend' of 'list' objects}
     1620    0.008    0.000    0.008    0.000 {method 'truncate' of 'cStringIO.StringO' objects}
        2    0.000    0.000    0.000    0.000 {method 'settimeout' of '_socket.socket' objects}
       28    0.000    0.000    0.000    0.000 {setattr}
       20    0.018    0.001    0.018    0.001 {posix.listdir}
       14    0.048    0.003    0.048    0.003 {method 'get_data' of 'zipimport.zipimporter' objects}
        5    0.000    0.000    0.000    0.000 {method 'count' of 'list' objects}
        1    0.000    0.000    0.000    0.000 {_hashlib.openssl_sha384}
        7    0.000    0.000    0.000    0.000 {cStringIO.StringIO}
        3    0.001    0.000    0.001    0.000 {_ctypes.dlopen}
     2013  281.593    0.140  281.593    0.140 {time.sleep}
     1423    0.011    0.000    0.011    0.000 {method 'get' of 'dict' objects}
       77    0.004    0.000    0.004    0.000 {method 'remove' of 'list' objects}
        2    0.000    0.000    0.000    0.000 {method 'clear' of 'dict' objects}
        2    0.019    0.009    0.019    0.009 {method 'search' of '_sre.SRE_Pattern' objects}
      590    0.003    0.000    0.003    0.000 {min}
        2    0.010    0.005    0.010    0.005 {posix.popen}
       74    0.002    0.000    0.002    0.000 {method 'sub' of '_sre.SRE_Pattern' objects}
       26    0.000    0.000    0.000    0.000 {method 'update' of 'dict' objects}
     1783    0.026    0.000    0.026    0.000 {_struct.unpack}
      170    0.004    0.000    0.004    0.000 {method 'find' of 'str' objects}
        1    0.000    0.000    0.000    0.000 {posix.WIFEXITED}
        2    0.000    0.000    0.000    0.000 {built-in method now}
    20125    0.075    0.000    0.075    0.000 {method 'append' of 'list' objects}
        3    0.001    0.000    0.001    0.000 {dir}
        1    0.000    0.000    0.000    0.000 {method 'disable' of '_lsprof.Profiler' objects}
        3    0.001    0.000    0.001    0.000 {posix.uname}
       17    0.000    0.000    0.000    0.000 {method 'index' of 'list' objects}
        1    0.000    0.000    0.075    0.075 GPIO.py:1(<module>)
        1    0.000    0.000    0.075    0.075 GPIO.py:1(__bootstrap__)
        1    0.007    0.007    0.042    0.042 connection.py:1(<module>)
        1    0.000    0.000    0.749    0.749 UART.py:1(<module>)
        1    0.002    0.002    0.003    0.003 contextlib.py:1(<module>)
        1    0.000    0.000    0.000    0.000 <string>:1(SplitResult)
        1    0.005    0.005    0.177    0.177 lock.py:1(<module>)
        1    0.000    0.000    0.000    0.000 <string>:1(ParseResult)
        1    0.015    0.015    0.749    0.749 UART.py:1(__bootstrap__)
        1    0.002    0.002    0.005    0.005 utils.py:1(<module>)
        1    0.027    0.027    0.414    0.414 client.py:1(<module>)
        1    0.004    0.004    0.005    0.005 exceptions.py:1(<module>)
        1    0.000    0.000    0.000    0.000 <string>:1(<module>)
        1    0.005    0.005    0.010    0.010 collections.py:1(<module>)
        2    0.018    0.009    0.432    0.216 __init__.py:1(<module>)
        1    0.006    0.006    0.010    0.010 threading.py:1(<module>)
        1    0.014    0.014    0.148    0.148 _compat.py:1(<module>)
        1    0.000    0.000    0.000    0.000 bisect.py:1(<module>)
        1    0.021    0.021    0.021    0.021 Queue.py:1(<module>)
        1    0.001    0.001    0.020    0.020 encoder.py:2(<module>)
        1    0.001    0.001    0.041    0.041 decoder.py:2(<module>)
        1    0.004    0.004    0.027    0.027 scanner.py:2(<module>)
        1    0.001    0.001    0.003    0.003 symbol.py:3(<module>)
        1    0.008    0.008    0.008    0.008 base64.py:3(<module>)
        1    0.007    0.007    0.077    0.077 zipfile.py:3(<module>)
        1    0.000    0.000    0.000    0.000 token.py:3(<module>)
        1    0.026    0.026    0.033    0.033 __init__.py:4(<module>)
        1    0.027    0.027  406.865  406.865 main.py:4(<module>)
        1    0.001    0.001    0.001    0.001 _endian.py:4(<module>)
        1    0.004    0.004    0.022    0.022 util.py:4(<module>)
        1    0.000    0.000    0.000    0.000 cProfile.py:5(<module>)
        1    0.000    0.000    0.000    0.000 exceptions.py:5(RedisError)
        1    0.013    0.013    0.023    0.023 shutil.py:5(<module>)
        1    0.001    0.001    0.001    0.001 hex_codec.py:8(<module>)
        2    0.004    0.002    0.020    0.010 __init__.py:9(<module>)
        1    0.000    0.000    0.000    0.000 contextlib.py:9(GeneratorContextManager)
        1    0.000    0.000    0.000    0.000 lock.py:9(Lock)
        1    0.001    0.001    0.003    0.003 serialutil.py:9(<module>)
        1    0.000    0.000    0.145    0.145 platform.py:10(<module>)
        1    0.000    0.000    0.000    0.000 fnmatch.py:11(<module>)
        1    0.000    0.000    0.000    0.000 keyword.py:11(<module>)
        1    0.000    0.000    0.000    0.000 Queue.py:13(Empty)
        1    0.000    0.000    0.000    0.000 copy_reg.py:14(pickle)
      413    0.024    0.000    0.077    0.000 genericpath.py:15(exists)
        1    0.045    0.045    0.655    0.655 pkg_resources.py:15(<module>)
        1    0.012    0.012    0.016    0.016 serialposix.py:15(<module>)
        8    0.000    0.000    0.000    0.000 _weakrefset.py:16(__init__)
        2    0.000    0.000    0.000    0.000 functools.py:17(update_wrapper)
        1    0.000    0.000    0.000    0.000 Queue.py:17(Full)
        1    0.000    0.000    0.002    0.002 decoder.py:17(_floatconstants)
       24    0.000    0.000    0.001    0.000 UserDict.py:18(__getitem__)
        1    0.004    0.004    0.018    0.018 tempfile.py:18(<module>)
        1    0.000    0.000    0.000    0.000 zipfile.py:19(BadZipfile)
        1    0.000    0.000    0.000    0.000 exceptions.py:19(AuthenticationError)
        8    0.000    0.000    0.000    0.000 _weakrefset.py:20(__enter__)
        1    0.000    0.000    0.000    0.000 main.py:20(control)
        1    0.000    0.000    0.000    0.000 Queue.py:21(Queue)
        1    2.716    2.716  405.462  405.462 main.py:23(__init__)
        1    0.016    0.016    0.113    0.113 urllib.py:23(<module>)
        1    0.000    0.000    0.000    0.000 exceptions.py:23(ConnectionError)
        1    0.000    0.000    0.000    0.000 zipfile.py:23(LargeZipFile)
      146    0.008    0.000    0.008    0.000 sre_compile.py:24(_identityfunction)
      140    0.000    0.000    0.000    0.000 stat.py:24(S_IFMT)
        1    0.000    0.000    0.000    0.000 collections.py:25(OrderedDict)
        1    0.006    0.006    0.021    0.021 pickle.py:25(<module>)
        8    0.000    0.000    0.004    0.001 _weakrefset.py:26(__exit__)
        1    0.000    0.000    0.026    0.026 main.py:26(<lambda>)
        1    0.000    0.000    0.000    0.000 _endian.py:26(_swapped_meta)
       12    0.000    0.000    0.001    0.000 genericpath.py:26(isfile)
        1    0.000    0.000    0.000    0.000 copy_reg.py:27(constructor)
        1    0.000    0.000    0.000    0.000 exceptions.py:27(TimeoutError)
        1    0.000    0.000    0.025    0.025 version.py:27(<module>)
        1    0.000    0.000    0.000    0.000 hex_codec.py:27(hex_decode)
        1    0.003    0.003    0.038    0.038 urlparse.py:29(<module>)
        1    0.000    0.000    0.000    0.000 utils.py:29(dummy)
        1    0.004    0.004    0.004    0.004 heapq.py:31(<module>)
        1    0.000    0.000    0.000    0.000 exceptions.py:31(BusyLoadingError)
        1    0.000    0.000    0.000    0.000 shutil.py:31(Error)
        1    0.000    0.000    0.000    0.000 version.py:32(Version)
        8    0.000    0.000    0.000    0.000 _compat.py:32(nativestr)
   281/40    0.059    0.000    0.115    0.003 sre_compile.py:32(_compile)
        1    0.006    0.006    0.018    0.018 io.py:34(<module>)
        1    0.000    0.000    0.000    0.000 shutil.py:34(SpecialFileError)
        1    0.000    0.000    0.000    0.000 pprint.py:35(<module>)
        1    0.000    0.000    0.000    0.000 exceptions.py:35(InvalidResponse)
        1    0.000    0.000    0.001    0.001 os.py:35(_get_exports_list)
       28    0.001    0.000    0.001    0.000 _weakrefset.py:36(__init__)
     6915    0.023    0.000    0.023    0.000 _compat.py:37(b)
        1    0.000    0.000    0.000    0.000 shutil.py:38(ExecError)
       68    0.001    0.000    0.009    0.000 genericpath.py:38(isdir)
        1    0.000    0.000    0.000    0.000 exceptions.py:39(ResponseError)
        2    0.000    0.000    0.000    0.000 functools.py:39(wraps)
       68    0.001    0.000    0.001    0.000 stat.py:40(S_ISDIR)
        1    0.004    0.004    0.010    0.010 random.py:40(<module>)
     1620    0.007    0.000    0.007    0.000 _compat.py:41(byte_to_chr)
        1    0.000    0.000    0.000    0.000 exceptions.py:43(DataError)
        1    0.067    0.067    0.068    0.068 socket.py:45(<module>)
        1    0.000    0.000    0.000    0.000 hex_codec.py:45(Codec)
        1    0.000    0.000    0.003    0.003 warnings.py:45(filterwarnings)
        1    0.009    0.009    0.171    0.171 uuid.py:45(<module>)
        1    0.000    0.000    0.000    0.000 exceptions.py:47(PubSubError)
        1    0.007    0.007    0.007    0.007 __future__.py:48(<module>)
        1    0.000    0.000    0.000    0.000 __init__.py:49(normalize_encoding)
        1    0.000    0.000    0.000    0.000 _endian.py:49(BigEndianStructure)
       12    0.000    0.000    0.000    0.000 stat.py:49(S_ISREG)
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Last Post by vegaseat
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On first glance look at the items with the highest tottime values. Then check the number of calls and the percall time. Remember that function calls are expensive because of the overhead.

Edited by vegaseat

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