hg: jdk7u/jdk7u-dev/hotspot: 21 new changesets

[Mikael Vidstedt]

Even though the bug mentioned in the change refers to a specific test 
there are a number of other bugs that refer to other benchmarks where 
we're also seeing potential and/or real regressions. These benchmarks 
include, but are not limited to, SPECjvm2008. One of the problems is 
that the results are not consistent - in many cases we're seeing 
improvements, but in other cases regressions. All in all we'd like to 
know more about what's causing this before we're comfortable enough to 
turn tiered compilation on by default. I hope that makes sense.

Cheers,
Mikael

On 2012-04-25 10:48, David Dabbs wrote:
> Where/how are the performance regressions showing up? I saw mention of
> issues with FMW (fusion middleware?), but what was slower?
>
> Thank you,
>
> David
>
>> -----Original Message-----
>> From: jdk7u-dev-bounces at openjdk.java.net [mailto:jdk7u-dev-
>> bounces at openjdk.java.net] On Behalf Of Mikael Vidstedt
>> Sent: Wednesday, April 25, 2012 11:42 AM
>> To: Ismael Juma
>> Cc: jdk7u-dev at openjdk.java.net
>> Subject: Re: hg: jdk7u/jdk7u-dev/hotspot: 21 new changesets
>>
>>
>> We need time to investigate the performance regressions we're seeing and
>> meanwhile we will keep tiered compilation default off.
>>
>> Cheers,
>> Mikael
>>
>> On 2012-04-25 05:46, Ismael Juma wrote:
>>> On Fri, Apr 20, 2012 at 7:16 PM,<lana.steuck at oracle.com>   wrote:
>>>
>>>> Changeset: 34fce1d343b0
>>>> Author:    iveresov
>>>> Date:      2012-04-07 12:29 -0700
>>>> URL:
>>>> http://hg.openjdk.java.net/jdk7u/jdk7u-dev/hotspot/rev/34fce1d343b0
>>>>
>>>> 7159766: Tiered compilation causes performance regressions
>>>> Summary: Disable tiered in 7u4 because of the performance anomalies
>>>> with Oracle FMW
>>>> Reviewed-by: never, kvn
>>>>
>>>> ! src/cpu/sparc/vm/c2_globals_sparc.hpp
>>>> ! src/cpu/x86/vm/c2_globals_x86.hpp
>>>>
>>> I thought this change was meant just for jdk7u4, but it seems like it
>>> has gone to jdk7u6 too:
>>>
>>> http://download.java.net/jdk7u6/changes/jdk7u6-b07.html
>>>
>>> Is that intentional?
>>>
>>> Best,
>>> Ismael
>>
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