Disable tracer by default for profile use (issue4428074)

[Xinliang David Li]

Sharad can provide some some performance data -- we have seen up to 2%
degradation to with tracer turned on for one of google's most
important program. Perhaps Sharad can collect some SPEC numbers.

I agree a better approach should be to fix the problem in tracer
instead of turning it off in trunk.

David


On Thu, Apr 28, 2011 at 4:23 PM, Richard Guenther
<richard.guenther@gmail.com> wrote:
> On Thu, Apr 28, 2011 at 8:53 PM, Diego Novillo <dnovillo@google.com> wrote:
>> On Thu, Apr 28, 2011 at 14:51, Sharad Singhai <singhai@google.com> wrote:
>>> This patch disables -ftracer for profile use. Okay for google/main?
>>
>> Could you elaborate on why doing this is beneficial?  Are you
>> proposing this for trunk as well?
>
> It indeed doesn't make sense to me at all.
>
> Richard.
>
>>> 2011-04-28  Sharad Singhai  <singhai@google.com>
>>>
>>>        Google Ref 40087
>>>        * opts.c (common_handle_option): Disable -ftracer for profile use.
>>>        * doc/invoke.texi: Update doc that -ftracer is no longer enabled for FDO.
>>
>> OK.
>>
>>
>> Diego.
>>
>