Re: Large memory usage by gdb

[Alex Lindsay <alexlindsay239@gmail.com>]

Philippe,

Is memcheck a better tool to use here compared to massif?

Alex

On 07/25/2017 03:28 PM, Philippe Waroquiers wrote:
> Run gdb under Valgrind, and make some heap profiling dump at regular
> interval, (e.g. after each run).
>
> With valgrind 3.12 or before, you can do a leak report to show
> the delta (increase or decrease) compared to the previous leak search,
> including the reachable blocks. So, you will be able to see what
> increases the memory.
>
> If you compile the latest Valgrind (3.13), you can e.g. use memcheck
> and produce heap profiling reports readable with kcachegrind.
>
> You will need a gdb compiled with debug or install the debug info
> of gdb to have understandable stack traces.
>
> Philippe
>
> On Tue, 2017-07-25 at 15:20 -0500, Alex Lindsay wrote:
>> My OS is Ubuntu 17.04. Using both gdb 7.12 and 8.0, I experience large
>> memory usage when debugging my executable. As I add breakpoints and run
>> the executable multiple times in a single session, memory usage grows
>> continuously, regularly hitting 10s of GBs. I don't recall experiencing
>> this issue with earlier Ubuntu versions (and also likely earlier
>> versions of gdb). When I debug the same executable with `lldb`, memory
>> usage is pretty much constant at around 2 GB. Does anyone have any
>> suggestions?
>>
>> Alex
>