[LLVMdev] RFC: GLIBCXX_DEBUG ScheduleDAG Patch

[Evan Cheng]

Have you tested this on SPEC (especially spec2006)? JIT slow down of  
6% is really too steep a price to pay.

I'll test this patch when I find some time.

Evan

On Feb 4, 2008, at 9:31 AM, David Greene wrote:

> On Monday 21 January 2008 10:41, David Greene wrote:
>
>>>>> Can you clarify? Is this 1.7% slowdown of scheduling time or  
>>>>> overall
>>>>> codegen time? If it's the later, then it seems a bit too much.  
>>>>> Also,
>>>>> please test it with all the MultiSource/Applications.
>>>>
>>>> It's 1.7% overall.
>>>
>>> That seems somewhat steep. Can you see how much of the scheduling
>>> slow down there is?
>>
>> I got some times from the nightly report, so this is overall  
>> compile time.
>>
>> The worst slowdown is on timberwolfmc "llc compile" which has a 5%
>> slowdown.  The JIT slows down 6%.
>>
>> Everything else looks to be 1% or less.  In some cases the times with
>> the change are better, probably because this change gets rid of the  
>> "pop
>> everything off and push it back on" way of recreating the heap.[
>
> Just want to send a ping on this.  This patch is still waiting to go  
> in.  Is
> the compile time hit too much?  Note that sometimes compile time
> improves with this patch.
>
> I'd like to get this in ASAP so I can start merging other things  
> back to
> upstream.
>
>                                                      -Dave
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