gmon size of counter

gmon size of counter

[Diviya JAIN]

Hello,

While using gprof, I came across the fact that gmon.h specifies a short counter (kcount) in the gmonparam structure. But we require very large profiling counts, and hence short counters are insufficient for us. 

Is a new version of gmon.h is available which allows for larger counter value, or if you can suggest other possible alternatives that have been implemented till now.

Thank you,
diviya

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Diviya Jain				Tel(O): 91-120-2515262 Extn-6514
Advanced System Technology Group	TINA: 099-6514
ST Microelectronics, Noida

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Re: gmon size of counter

[Ian Lance Taylor]

Diviya JAIN <diviya.jain@st.com> writes:

> While using gprof, I came across the fact that gmon.h specifies a
> short counter (kcount) in the gmonparam structure. But we require
> very large profiling counts, and hence short counters are
> insufficient for us.

> Is a new version of gmon.h is available which allows for larger
> counter value, or if you can suggest other possible alternatives
> that have been implemented till now.

The structure needs to be kept in synch between the generating
function, which is in glibc, and the reading function, which is in
gprof.

If you change both simultaneously, you can do whatever you like.

Ian

Re: gmon size of counter

[Andrew Cagney]

> Diviya JAIN <diviya.jain@st.com> writes:
> 
> 
>>> While using gprof, I came across the fact that gmon.h specifies a
>>> short counter (kcount) in the gmonparam structure. But we require
>>> very large profiling counts, and hence short counters are
>>> insufficient for us.
> 
> 
>>> Is a new version of gmon.h is available which allows for larger
>>> counter value, or if you can suggest other possible alternatives
>>> that have been implemented till now.
> 
> 
> The structure needs to be kept in synch between the generating
> function, which is in glibc, and the reading function, which is in
> gprof.
> 
> If you change both simultaneously, you can do whatever you like.

Is there a way to check for counter-size consistency between gprof and 
glibc?

Andrew

Re: gmon size of counter

[Ian Lance Taylor]

Andrew Cagney <cagney@gnu.org> writes:

> > Diviya JAIN <diviya.jain@st.com> writes:
> >
> >>> While using gprof, I came across the fact that gmon.h specifies a
> >>> short counter (kcount) in the gmonparam structure. But we require
> >>> very large profiling counts, and hence short counters are
> >>> insufficient for us.
> >
> >>> Is a new version of gmon.h is available which allows for larger
> >>> counter value, or if you can suggest other possible alternatives
> >>> that have been implemented till now.
> > The structure needs to be kept in synch between the generating
> > function, which is in glibc, and the reading function, which is in
> > gprof.
> > If you change both simultaneously, you can do whatever you like.
> 
> Is there a way to check for counter-size consistency between gprof and
> glibc?

There is a magic number.  I don't think there is anything which
explicitly states the size of the histogram entries.

(They are 16 bits in all existing implementations.)

Ian