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Re: gdb performance is impossible!!
Shlomo,
Well, what ARE the compiler switches and secret debugging environment
variables that make the difference?
...Jake
>>>>> "Shlomo" == Anglister, Shlomo <shlomo.anglister@intel.com> writes:
Shlomo> Hi, What we have is more and more people/companies/groups moving
Shlomo> to C++. Moreover, after so many years of SW development we all
Shlomo> reached the conclusion that shared libraries is the solution for
Shlomo> large applications.
Shlomo> It seems that debugging large programs using many/large shared
Shlomo> libraries is a pain and a common problem to all architectures.
Shlomo> I think the real problem is that OS providers HP, SGI, SUN, IBM
Shlomo> provide very poor and basic documentation on how to debug large
Shlomo> applications.
Shlomo> We found out that compiler switches + secret debug environment
Shlomo> variables could make the change !!!!!!
Shlomo> Anglister Shlomo
Shlomo> -----Original Message----- From: Srikanth
Shlomo> [mailto:srikanth@cup.hp.com] Sent: Tuesday, September
Shlomo> 07, 1999 7:17 PM To: Guenther Grau Cc: Jake Colman;
Shlomo> gdb@sourceware.cygnus.com Subject: Re: gdb
Shlomo> performance is impossible!!
Shlomo> Guenther Grau wrote:
>>
>> Jake Colman wrote:
>> > So, what should we be looking at as a potential problem?
Shlomo> The application is
>> > rather large is linked with about 10 of our own shared
Shlomo> libraries - in
>> > addition to whatever system libraries might be shared as
Shlomo> well. It uses g++
>> > and is compiler with what think are the appropriate gcc
Shlomo> flags for shared
>> > libraries and debugging.
>> >
>> > Any help would be greatly appreciated!
>>
>> How large is large? Our applications are large ~150 MB on
Shlomo> disk
>> and it takes quite a while to read all the libs. (And yes,
Shlomo> our
>> application is mainly c++ as well, so maybe this is a
Shlomo> problem?)
>>
>> Guenther
Shlomo> On the HP WDB, we have seen cases where ~50%
Shlomo> of the
Shlomo> time is
Shlomo> spent in demangling the minimal symbols. The quick
Shlomo> sort in install_minimal_symbols() is also a big
Shlomo> ticket item. It
Shlomo> would be
Shlomo> nice to defer sorting to just until it is needed and
Shlomo> even
Shlomo> then
Shlomo> do it on a per objfile basis.
Shlomo> Srikanth.
--
Jake Colman
Principia Partners LLC Phone: (201) 946-0300
Harborside Financial Center Fax: (201) 946-0320
902 Plaza II Beeper: (800) 505-2795
Jersey City, NJ 07311 E-mail: colman@ppllc.com
E-mail: jcolman@jnc.com
web: http://www.ppllc.com
"Every time I think I've idiot-proofed something someone comes up with a
better idiot"