Re: gdbserver/gdb-6/4 and lots of pthreads

[jbbachky@aim.com]

Thanks for the reply and good news! I'll work on getting that code and 
building it.

>-----Original Message-----
>From: drow@false.org
>To: jbbachky@aim.com
>Cc: gdb@sources.redhat.com
>Sent: Wed, 15 Nov 2006 11:49 AM
>Subject: Re: gdbserver/gdb-6/4 and lots of pthreads
>
>On Wed, Nov 15, 2006 at 11:11:45AM -0500, jbbachky@aim.com wrote:
>> Gdbserver attaches to my main thread and opens a socket, and then 
after
>> invoking gdb and specifying my remote target, I select the 
particular
>> thread that I wish to debug. Info threads shows all of my threads, 
and
>> I see that gdbserver now attaches to all of them.
>
>Normally this is a feature :-)
>
>> Any attempt to single-step or continue with a breakpoint results in 
a
>> "thrashing system". A counter in my context switching code shows 
almost
>> 150k switchs/second, up from about 1200/sec when not attached with 
gdb.
>> One of the 40 pthreads handle a 10ms SIGALRM. Almost all of the 
others
>> are waiting for messages.
>
>It'll be the 10ms SIGALRM. Fortunately, I have _just_ the thing for
>you. If you can wait another day or two, I expect to commit a patch
>which dramatically improves gdbserver performance for multithreaded
>applications with signals ignored by GDB. You can find the patch on
>the gdb-patches list archives if you want to try it in the mean time;
>it should apply to a checkout of current CVS HEAD. You need a patched
>gdbserver and gdb client.
>
>--
>Daniel Jacobowitz
>CodeSourcery
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