[PATCH v4] Improve the performance of --num-threads -d 31

[Minfei Huang]

Hi, Zhou.

I'm on holiday now, you can ask other people to help test, if necessary.

Thanks
Minfei

> 在 2016年3月24日，12:29，Zhou, Wenjian/周文剑 <zhouwj-fnst at cn.fujitsu.com> 写道：
> 
> Hello Minfei,
> 
> How do these two patches work?
> 
> -- 
> Thanks
> Zhou
> 
>> On 03/18/2016 01:48 PM, "Zhou, Wenjian/周文剑" wrote:
>>> On 03/18/2016 12:16 PM, Minfei Huang wrote:
>>>> On 03/18/16 at 10:46am, "Zhou, Wenjian/周文剑" wrote:
>>>> Hello Minfei,
>>>> 
>>>> Since I can't produce the bug, I reviewed the patch and wrote an increment patch.
>>>> Though there are some bugs in the increment patch,
>>>> I wonder if the previous bug still exists with this patch.
>>>> Could you help me confirm it?
>>> 
>>> Ok. I will help verify this increasing patch.
>> 
>> Thank you very much.
>> 
>>>> 
>>>> And I have another question.
>>>> Did it only occur in patch v4?
>>> 
>>> This issue doesn't exist in v3. I have pasted the test result with
>>> --num-thread 32 in that thread.
>>> 
>>> applied makedumpfile with option -d 31 --num-threads 32
>>> real    3m3.533s
>> 
>> Oh, then the patch in the previous mail may not work.
>> 
>> I'm appreciated if you can also test the patch in this letter.
>> 
>> I introduced semaphore to fix the bug in the v3.
>> So I want to know if it is this which affects the result.
>> The attached patch is based on v4, used to remove semaohore.
>> 
>> 
>> 
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> 
>