Re: Zerolink slows gdb to a crawl?
Re: Zerolink slows gdb to a crawl?
- Subject: Re: Zerolink slows gdb to a crawl?
- From: Jonathan del Strother <email@hidden>
- Date: Wed, 18 Jan 2006 12:42:12 +0000
On 17 Jan 2006, at 00:08, Jonathan Taylor wrote:
gdb is painfully slow when debugging my project - just a simple
'Step
Over' takes a couple of seconds per line. I've discovered that
turning off Zerolink makes this much faster. A smaller project
doesn't seem to suffer from the same problems.
My project has around 60 .ob files for zerolinking. Is there a
known
problem with gdb speeds & lots of .ob files? Is there anything I
can
try that might speed things up?
ZeroLink saves time at link time by deferring all linking and loading
till runtime. With some projects this is fast and efficient, but
with
others it causes big slowdowns when debugging; it depends on the
organization of your project.
If you spend more time loading the .ob files dynamically at debug
time
than you'd spend actually linking them at link time, then by all
means
turn off ZeroLink for this project.
The experience I had, and the timings attached to the bug report I
referred to (rdar://4349128), seemed to suggest that it wasn't just
time taken loading the files dynamically that was the problem.
Successive single-steps within a single function took far longer
than with zerolink turned off: I would have expected that if it was
just a dynamic loading issue then the delay should go away after a
few single-steps (particularly around a loop), which isn't my
experience.
I'd just like to echo what Jonny said: the slowdown isn't just during
library loading - it seems to occur on every single user command to gdb.Attachment:
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