From: Andrew Cagney <ac131313@redhat.com>
To: Robert Vazan <robertvazan@privateweb.sk>
Cc: gdb@sources.redhat.com
Subject: Re: Terminally slow (75 seconds) on some steps
Date: Thu, 17 Jul 2003 16:34:00 -0000 [thread overview]
Message-ID: <3F16D022.30209@redhat.com> (raw)
In-Reply-To: <Mahogany-0.65.0-16720-20030712-110333.00@pcw2k69.energoinfo.sk>
> I am trying to debug large program and I am observing unusual slowdown.
> I don't have any breakpoints, I am just running the app. I measured 75
> seconds of wall clock for single click operation that takes fraction of
> second outside debugger. Process time (as viewed by ps) of gdb increased
> by 68 seconds. I get realtime reaction with some operations and this
> delay with some other operations. When single stepping, it seems that
> the more lines must be executed the more time it takes in debugger (but
> this is in 1-5 seconds range).
>
> As if gdb was emulating every instruction. I know this isn't the case.
> However, breakpoints cause interrupts, so maybe gdb is being bogged down
> by some other interrupts, timer maybe? Given that single step can take
> one or more seconds, few timers could quickly accumulate to minute.
>
> I have also this problem that I cannot run the program twice per
> session, so I have to restart gdb and consequently reload symbols. I
> have aging snapshot from 1. April 2002.
Is this a threaded program on GNU/Linux? 5.3 contained a major
performance improvement for threaded debugging.
Also, something from April '02 is seriously old. Try either 5.3, or a
6.0 snap (see http://www.gnu.org/software/gdb/download/)
next prev parent reply other threads:[~2003-07-17 16:34 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1057999221.6815.ezmlm@sources.redhat.com>
2003-07-12 9:03 ` Robert Vazan
2003-07-17 16:34 ` Andrew Cagney [this message]
2003-07-18 13:06 ` Robert Vazan
2003-07-18 21:56 ` Andrew Cagney
2003-07-19 11:29 ` Robert Vazan
2003-07-21 14:21 ` Andrew Cagney
2003-07-21 17:38 ` Robert Vazan
2003-08-05 5:20 ` Andrew Cagney
2003-08-05 18:04 ` Robert Vazan
2003-08-05 18:35 ` Andrew Cagney
2003-08-14 12:05 ` Robert Vazan
2003-08-15 22:59 ` Andrew Cagney
2003-08-16 15:11 ` Daniel Jacobowitz
2003-08-16 16:36 ` Andrew Cagney
2003-08-16 16:41 ` Daniel Jacobowitz
2003-08-17 3:29 ` Daniel Berlin
2003-08-18 15:05 ` Andrew Cagney
2003-08-18 16:15 ` Daniel Berlin
2003-08-16 16:38 ` Robert Vazan
2003-08-20 16:12 ` Robert Vazan
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