[Mono-dev] Mono preview 2.0 binary and DTrace

[Zoltan Varga]

Hi,

  On mono HEAD, dtrace is now enabled under solaris and macosx if the
dtrace utility is
detected by configure.

               Zoltan

On Sun, Aug 3, 2008 at 4:08 PM, Andreas Färber <andreas.faerber at web.de> wrote:
> Hi,
>
> Are you talking of the once announced binary snapshots of trunk
> Mono.framework, so that you would make some Novell-internal setting to
> configure with --enable-dtrace?
>
> Or do you suggest me to change trunk's configure.in to enable DTrace when
> specifically Mac OS X v10.5+ is detected and no --disable-dtrace was passed?
> Changes other than that I am skeptical about.
>
> Btw Universal Binaries shouldn't be a problem, since iirc you use lipo to
> combine two separate builds and the mono.d file would be
> platform-independent so no special handling necessary.
>
> Andreas
>
> Am 02.08.2008 um 20:14 schrieb Geoff Norton:
>
>> Zoltan,
>>
>>  I'm fine with this on trunk, but I still think barring any compelling
>> reason we should leave the branch as is.
>>
>> -g
>>
>> On Sat, 2008-08-02 at 19:20 +0200, Zoltan Varga wrote:
>>>
>>> Hi,
>>>
>>>  Looking at dtrace.h, all the current probes seem to be in
>>> non-critical code-paths, so they
>>> are unlikely to have a perf impact. We could make --enable-dtrace=true
>>> the default in HEAD,
>>> so it gets some testing.
>>>
>>>                         Zoltan
>>>
>>> On Sat, Aug 2, 2008 at 7:16 PM, Geoff Norton <gnorton at novell.com> wrote:
>>>>
>>>> On Sat, 2008-08-02 at 18:30 +0200, Andreas Färber wrote:
>>>>
>>>>> Not fully true, there is of course a minimal degradation (~5 nop
>>>>> instructions on Solaris), but it should be hardly noticeable. I have
>>>>> taken care to only call helper functions when the probe is active.
>>>>>
>>>>> Was the answer on IRC in any way official? I could think of three
>>>>> possible reasons:
>>>>>
>>>>> a) Worries about performance degradation.
>>>>
>>>> Yes
>>>>
>>>>> b) No one updated the build system.
>>>>
>>>> True but minor
>>>>
>>>>> c) The build machine isn't DTrace-capable.
>>>>
>>>> d) We havn't tested it fully in our QA process, nor has it been
>>>> available long enough for us to feel comfortable turning it on at this
>>>> stage.  We also would need to invesgate how to do it in our universal
>>>> binaries, etc.  Its a lot of testing and it unfortunately will not make
>>>> 2.0 unless there is a compelling argument against this and support from
>>>> the runtime team and from the QA team.
>>>>
>>>> -g
>>>>
>>>>
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>>>>
>>
>
>