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<== Date ==> <== Thread ==>

Subject: Re: How to profile an EPICS application on Linux
From: "John A. Priller" <priller@nscl.msu.edu>
To: <tech-talk@aps.anl.gov>
Date: Wed, 12 Sep 2012 08:06:43 -0400
I've been using valgrind/callgrind to gather performance data:

<http://valgrind.org/docs/manual/cl-manual.html>

There's a very nice GUI tool for viewing the results:

<http://kcachegrind.sourceforge.net/html/Home.html>

These are all available as packages for Debian/Ubuntu (the flavor of Linux we use for soft IOCs).

On 9/10/2012 5:17 PM, Mark Rivers wrote:
Folks,

I have an EPICS IOC application that is taking a lot of CPU time and I want to figure out where it is spending its time.  The IOC is running on Linux, and it seems like the Linux "gprof" tool should do what I want.

I added the following lines to my application Makefile, and also changed CONFIG to STATIC_BUILD=YES.

USR_CPPFLAGS_Linux += -pg
USR_CFLAGS_Linux += -pg
USR_LDFLAGS_Linux += -pg

The application creates the gmon.out file as expected.  The problem is that the output of gprof seems to have the number of calls to each function correctly, but does not have execution times.

corvette:quadEM/iocBoot/iocTest>gprof -b ../../bin/linux-x86/quadEMTestApp gmon.out | more
Flat profile:

Each sample counts as 0.01 seconds.
   %   cumulative   self              self     total
  time   seconds   seconds    calls  Ts/call  Ts/call  name
100.00      0.01     0.01                             yyerror
   0.00      0.01     0.00 25739421     0.00     0.00  getAddr
   0.00      0.01     0.00 11866294     0.00     0.00  paramList::getParameter(int)
   0.00      0.01     0.00  7586090     0.00     0.00  paramVal::isDefined()
   0.00      0.01     0.00  3706973     0.00     0.00  getTraceMask
   0.00      0.01     0.00  3403295     0.00     0.00  paramVal::getStatus()
   0.00      0.01     0.00  2237527     0.00     0.00  paramList::getInteger(int, int*)
   0.00      0.01     0.00  2237526     0.00     0.00  paramVal::getInteger()
   0.00      0.01     0.00  2235123     0.00     0.00  interruptEnd
   0.00      0.01     0.00  2235122     0.00     0.00  interruptStart
   0.00      0.01     0.00  2143477     0.00     0.00  paramVal::hasValueChanged()
   0.00      0.01     0.00  2143477     0.00     0.00  paramList::registerParameterChange(paramVal*, int)
   0.00      0.01     0.00  2136839     0.00     0.00  paramVal::resetValueChanged()
   0.00      0.01     0.00  2136838     0.00     0.00  paramList::setFlag(int)
   0.00      0.01     0.00  2136837     0.00     0.00  paramVal::setValueChanged()
   0.00      0.01     0.00  2136836     0.00     0.00  paramVal::setDefined(bool)
   0.00      0.01     0.00  1169154     0.00     0.00  asynPortDriver::getIntegerParam(int, int, int*)
   0.00      0.01     0.00  1071776     0.00     0.00  paramVal::setInteger(int)
   0.00      0.01     0.00  1071776     0.00     0.00  paramList::setInteger(int, int)
   0.00      0.01     0.00  1071775     0.00     0.00  asynPortDriver::setIntegerParam(int, int, int)
   0.00      0.01     0.00  1071721     0.00     0.00  asynPortDriver::callParamCallbacks(int, int)
   0.00      0.01     0.00  1071719     0.00     0.00  paramList::callCallbacks(int)
   0.00      0.01     0.00  1071701     0.00     0.00  asynPortDriver::setDoubleParam(int, int, double)
   0.00      0.01     0.00  1071701     0.00     0.00  paramVal::setDouble(double)
   0.00      0.01     0.00  1071700     0.00     0.00  paramList::setDouble(int, double)
   0.00      0.01     0.00  1071673     0.00     0.00  asynPortDriver::callParamCallbacks(int)
   0.00      0.01     0.00  1068372     0.00     0.00  paramList::int32Callback(int, int)
   0.00      0.01     0.00  1068362     0.00     0.00  paramVal::getDouble()
   0.00      0.01     0.00  1068362     0.00     0.00  paramList::getDouble(int, double*)
   0.00      0.01     0.00  1068356     0.00     0.00  paramList::float64Callback(int, int)
   0.00      0.01     0.00  1068349     0.00     0.00  interruptCallbackAverage
   0.00      0.01     0.00   389732     0.00     0.00  asynPortDriver::getIntegerParam(int, int*)
   0.00      0.01     0.00    97846     0.00     0.00  createAsynUser
   0.00      0.01     0.00    97724     0.00     0.00  queueRequest
   0.00      0.01     0.00    97706     0.00     0.00  duplicateAsynUser
   0.00      0.01     0.00    97705     0.00     0.00  disconnect
   0.00      0.01     0.00    97682     0.00     0.00  freeAsynUser
   0.00      0.01     0.00    97679     0.00     0.00  lockPort
   0.00      0.01     0.00    97676     0.00     0.00  asynPortDriver::lock()
   0.00      0.01     0.00    97676     0.00     0.00  asynPortDriver::unlock()
   0.00      0.01     0.00    97675     0.00     0.00  unlockPort
   0.00      0.01     0.00    97667     0.00     0.00  lockPortCallback
   0.00      0.01     0.00    97570     0.00     0.00  readIt
   0.00      0.01     0.00    97444     0.00     0.00  readIt
   0.00      0.01     0.00    97425     0.00     0.00  asynPortDriver::getParamStatus(int, int, asynStatus*)
   0.00      0.01     0.00    97425     0.00     0.00  asynStatus asynPortDriver::doCallbacksArray<int, asynInt32ArrayInterrupt>(int*, unsigned int, int, int, void*)
   0.00      0.01     0.00    97425     0.00     0.00  asynPortDriver::doCallbacksInt32Array(int*, unsigned int, int, int)
   0.00      0.01     0.00    97425     0.00     0.00  drvQuadEM::computePositions(int*)
   0.00      0.01     0.00    97424     0.00     0.00  paramList::getStatus(int, asynStatus*)
   0.00      0.01     0.00    10835     0.00     0.00  paramVal::nameEquals(char const*)
   0.00      0.01     0.00      999     0.00     0.00  getPortName
   0.00      0.01     0.00      988     0.00     0.00  readIt
   0.00      0.01     0.00      988     0.00     0.00  readIt
   0.00      0.01     0.00      970     0.00     0.00  callInterruptUsers
   0.00      0.01     0.00      584     0.00     0.00  paramList::findParam(char const*, int*)
   0.00      0.01     0.00      462     0.00     0.00  asynPortDriver::createParam(int, char const*, asynParamType, int*)
   0.00      0.01     0.00      462     0.00     0.00  paramVal::paramVal(char const*, asynParamType)
   0.00      0.01     0.00      462     0.00     0.00  paramVal::paramVal(char const*)
   0.00      0.01     0.00      462     0.00     0.00  paramList::createParam(char const*, asynParamType, int*)
   0.00      0.01     0.00      396     0.00     0.00  findInterface
   0.00      0.01     0.00      371     0.00     0.00  processAiAverage
   0.00      0.01     0.00      192     0.00     0.00  asynPortDriver::getAddress(asynUser*, int*)
   0.00      0.01     0.00      184     0.00     0.00  memMalloc
   0.00      0.01     0.00      158     0.00     0.00  connectDevice
   0.00      0.01     0.00      144     0.00     0.00  flushIt
   0.00      0.01     0.00      144     0.00     0.00  flushIt
   0.00      0.01     0.00      144     0.00     0.00  flushIt
   0.00      0.01     0.00      141     0.00     0.00  writeIt
   0.00      0.01     0.00      141     0.00     0.00  writeIt
   0.00      0.01     0.00      140     0.00     0.00  writeIt
   0.00      0.01     0.00      128     0.00     0.00  writeRead
   0.00      0.01     0.00      122     0.00     0.00  asynPortDriver::drvUserCreate(asynUser*, char const*, char const**, unsigned int*)
   0.00      0.01     0.00      122     0.00     0.00  asynPortDriver::findParam(int, char const*, int*)
   0.00      0.01     0.00      122     0.00     0.00  drvUserCreate
   0.00      0.01     0.00       94     0.00     0.00  drvAHxxx::writeReadMeter()
   0.00      0.01     0.00       85     0.00     0.00  asynPortDriver::setIntegerParam(int, int)
   0.00      0.01     0.00       65     0.00     0.00  canBlock
   0.00      0.01     0.00       65     0.00     0.00  parseLink
   0.00      0.01     0.00       65     0.00     0.00  skipWhite
   0.00      0.01     0.00       52     0.00     0.00  getCallbackValue
   0.00      0.01     0.00       45     0.00     0.00  connect
   0.00      0.01     0.00       45     0.00     0.00  initCommon
   0.00      0.01     0.00       42     0.00     0.00  asynPortDriver::createParam(char const*, asynParamType, int*)
   0.00      0.01     0.00       30     0.00     0.00  setInputEos
   0.00      0.01     0.00       30     0.00     0.00  setInputEos
   0.00      0.01     0.00       29     0.00     0.00  addInterruptUser
   0.00      0.01     0.00       29     0.00     0.00  createInterruptNode
   0.00      0.01     0.00       29     0.00     0.00  getInterruptPvt
   0.00      0.01     0.00       28     0.00     0.00  drvAHxxx::setAcquire(int)
   0.00      0.01     0.00       27     0.00     0.00  asynPortDriver::callParamCallbacks()
   0.00      0.01     0.00       26     0.00     0.00  announceExceptionOccurred
...


Does anyone with gprof experience know why I am not getting the execution times in these functions?

Thanks,
Mark



--
John A. Priller            | Phone : (517) 908-7375
MSU Cyclotron Laboratory   | Fax   : (517) 908-7126
640 S. Shaw Lane rm 1300D  | Email : priller@nscl.msu.edu
East Lansing, MI 48824     | Web   : http://www.nscl.msu.edu/~priller/


Replies:
RE: How to profile an EPICS application on Linux Mark Rivers
References:
How to profile an EPICS application on Linux Mark Rivers

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