[petsc-users] Memory logging in fortran

[Barry Smith]

On May 22, 2013, at 8:32 PM, Colin McAuliffe <cjm2176 at columbia.edu> wrote:

> According to gdb the program goes here
> 
> 110: #elif defined(PETSC_HAVE_TASK_INFO)
> 111:   *mem = 0;
> 
> The configuration flags from my petsc compilation indicate that both PETSC_HAVE_TASK_INFO and PETSC_HAVE_GETRUSAGE are 1. I'm not sure what have task info is supposed to do, is it safe to set it to 0 to see if this fixes the problem?

    Remove the PETSC_HAVE_TASK_INFO  stuff completely and then rerun make and see if it solves the problem.

     At some point the TASK_INFO stuff worked on the Apple some years ago, perhaps they turned if off.

   Barry

> 
> Quoting Barry Smith <bsmith at mcs.anl.gov>:
> 
>> 
>> On May 22, 2013, at 7:06 PM, Colin McAuliffe <cjm2176 at columbia.edu> wrote:
>> 
>>> Hi Barry, thanks for the quick response.
>>> 
>>> I am using os x and so I would expect that petsc would be able to  use getrusage in the following lines of mem.c:
>>> 
>>> 115: #elif defined(PETSC_HAVE_GETRUSAGE)
>>> 116:   getrusage(RUSAGE_SELF,&temp);
>>> 
>>> Is this not the case?
>> 
>>   You can run in the debugger, put a break point at that line to  verify it goes there and if it does check the values of temp after  the call. (Sometimes Apple's docs are more optimistic than reality.)
>> 
>>   Barry
>> 
>>> 
>>> Here is the link to apple's getrusage manual page
>>> http://developer.apple.com/library/mac/#documentation/Darwin/Reference/ManPages/10.7/man2/getrusage.2.html
>>> 
>>> Quoting Barry Smith <bsmith at mcs.anl.gov>:
>>> 
>>>> 
>>>>  Colin,
>>>> 
>>>>   PetscMemoryGetCurrentUsage() and MaximumUsage() us calls to the   underlying operating system to get how much memory the process is   using, as such they will also include external package memory.   Unfortunately it depends on the operating system providing this   information and often it does not, this is why you get 0. If you  are  a hacker you could look at the source for   PetscMemoryGetCurrentUsage() and see how to get the information  for  your OS and add it to this routine.
>>>> 
>>>>  Barry
>>>> 
>>>> 
>>>> 
>>>> On May 22, 2013, at 6:31 PM, Colin McAuliffe <cjm2176 at columbia.edu> wrote:
>>>> 
>>>>> Hi all,
>>>>> 
>>>>> When calling PetscMemoryGetCurrentUsage or   PetscMemoryGetMaximumUsage in a fortran code the memory usage   returned is always zero. Adding command line options such as   -malloc_log and -memory_info doesn't change this result. Is there   something else I'm missing? Also, will use of these two  functions  give memory used by external packaged called by petsc?
>>>>> 
>>>>> All the best,
>>>>> Colin
>>>>> 
>>>>> --
>>>>> Colin McAuliffe
>>>>> PhD Candidate
>>>>> Columbia University
>>>>> Department of Civil Engineering and Engineering Mechanics
>>>> 
>>>> 
>>>> 
>>> 
>>> 
>>> 
>>> --
>>> Colin McAuliffe
>>> PhD Candidate
>>> Columbia University
>>> Department of Civil Engineering and Engineering Mechanics
>> 
>> 
>> 
> 
> 
> 
> -- 
> Colin McAuliffe
> PhD Candidate
> Columbia University
> Department of Civil Engineering and Engineering Mechanics