# callgrind_control

## NAME



           callgrind_control - observe and control programs being run by
           Callgrind
    


## SYNOPSIS



    
           **callgrind_control**[_options_] [_pid|program-name_...]
    


## DESCRIPTION



           **callgrind_control** controls programs being run by the Valgrind tool
           Callgrind. When a **pid/program name** argument is not specified, all
           applications currently being run by Callgrind on this system will
           be used for actions given by the specified option(s). The default
           action is to give some brief information about the applications
           being run by Callgrind.
    


## OPTIONS



           **-h --help**
               Show a short description, usage, and summary of options.
    
           **--version**
               Show version of callgrind_control.
    
           **-l --long**
               Show also the working directory, in addition to the brief
               information given by default.
    
           **-s --stat**
               Show statistics information about active Callgrind runs.
    
           **-b --back**
               Show stack/back traces of each thread in active Callgrind
               runs. For each active function in the stack trace, also the
               number of invocations since program start (or last dump) is
               shown. This option can be combined with -e to show inclusive
               cost of active functions.
    
           **-e [A,B,...]**(default: all)
               Show the current per-thread, exclusive cost values of event
               counters. If no explicit event names are given, figures for
               all event types which are collected in the given Callgrind run
               are shown. Otherwise, only figures for event types A, B, ...
               are shown. If this option is combined with -b, inclusive cost
               for the functions of each active stack frame is provided, too.
    
           **--dump[= <desc>]  **(default: no description)
               Request the dumping of profile information. Optionally, a
               description can be specified which is written into the dump as
               part of the information giving the reason which triggered the
               dump action. This can be used to distinguish multiple dumps.
    
           **-z --zero**
               Zero all event counters.
    
           **-k --kill**
               Force a Callgrind run to be terminated.
    
           **--instr= <on|off>**
               Switch instrumentation mode on or off. If a Callgrind run has
               instrumentation disabled, no simulation is done and no events
               are counted. This is useful to skip uninteresting program
               parts, as there is much less slowdown (same as with the
               Valgrind tool "none"). See also the Callgrind option
               **--instr-atstart**.
    
           **--vgdb-prefix= <prefix>**
               Specify the vgdb prefix to use by callgrind_control.
               callgrind_control internally uses vgdb to find and control the
               active Callgrind runs. If the **--vgdb-prefix** option was used
               for launching valgrind, then the same option must be given to
               callgrind_control.
    


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