[Bug gdb/24889] From gdb 8.1, major performance issue with all the commands involving a symbol lookup on class members of SystemC types

[Bug gdb/24889] From gdb 8.1, major performance issue with all the commands involving a symbol lookup on class members of SystemC types

[julien.torres at synopsys dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=24889

--- Comment #1 from Julien <julien.torres at synopsys dot com> ---
Hi,

Is there any update with this issue?
I tried with gdb 8.3 and the problem is still there.

Thanks.

Julien

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[Bug gdb/24889] From gdb 8.1, major performance issue with all the commands involving a symbol lookup on class members of SystemC types

[simark at simark dot ca]

https://sourceware.org/bugzilla/show_bug.cgi?id=24889

Simon Marchi <simark at simark dot ca> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |simark at simark dot ca

--- Comment #2 from Simon Marchi <simark at simark dot ca> ---
(In reply to Julien from comment #1)
> Hi,
> 
> Is there any update with this issue?
> I tried with gdb 8.3 and the problem is still there.
> 
> Thanks.
> 
> Julien

Nobody is looking into this AFAIK.

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[Bug gdb/24889] From gdb 8.1, major performance issue with all the commands involving a symbol lookup on class members of SystemC types

[julien.torres at synopsys dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=24889

--- Comment #3 from Julien <julien.torres at synopsys dot com> ---
Hi Simon,

I have made some benchmarks on the attached example with various gdb versions.

gdb version   Time in seconds
gdb 8.0.1        2.3
gdb 8.1         10.0
gdb 8.3         10.1
gdb 9.1          5.8
gdb 9.2          6.0
gdb 10.1         4.9

As you can see, things have been significantly improved in 9.1 and 10.1, but it
is still significantly slower than with 8.0.1.

I have found the issue with some programs using SystemC. But this probably
affects other programs which use lots of complex template classes and types (as
SystemC does).

So it would be be great if someone could have a look at the issue.

Thanks.

Julien

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[Bug gdb/24889] From gdb 8.1, major performance issue with all the commands involving a symbol lookup on class members of SystemC types

[cbiesinger at google dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=24889

Christian Biesinger <cbiesinger at google dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |cbiesinger at google dot com

--- Comment #4 from Christian Biesinger <cbiesinger at google dot com> ---
Thanks for doing that benchmark. Could you share exactly which commands you
tried that were slow?

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[Bug gdb/24889] From gdb 8.1, major performance issue with all the commands involving a symbol lookup on class members of SystemC types

[julien.torres at synopsys dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=24889

--- Comment #5 from Julien <julien.torres at synopsys dot com> ---
Hi Christian,

I used the example attached to this ticket.
Then I simply ran:
% time gdb -x test.gdb
With test.gdb containing the following:

file ./test

break 6
run
set pagination off

set $loop = 10
while $loop > 0
whatis my_bool
set $loop = $loop - 1
end

cont
quit


Thanks.

Julien

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