RFR (M) 8198720: Obsolete PrintSafepointStatistics, PrintSafepointStatisticsTimeout and PrintSafepointStatisticsCount options

Aleksey Shipilev shade at redhat.com
Mon Jul 9 20:08:22 UTC 2018

Thank you!

Most latency-savvy folks "out there" run with some sort of safepointing profiling, which in many
cases include PrintSafepointStatistics tables.


On 07/09/2018 08:35 PM, coleen.phillimore at oracle.com wrote:
> Okay, somehow the columns of numbers didn't look very useful on my screen to me, and I wanted to
> convert this to UL (and straighten out the logic), so that's why I made this change.   I asked
> around internally to see which people would care about the format change and didn't find anyone
> specific.  Now I know!
> Let me rework this to use UL but keep the table.
> I'll withdraw this change for now.
> Thank you for the quick feedback.
> Coleen
> On 7/9/18 1:58 PM, Aleksey Shipilev wrote:
>> On 07/09/2018 07:48 PM, coleen.phillimore at oracle.com wrote:
>>> Summary: Convert PrintSafepointStatistics to UL
>>> open webrev at http://cr.openjdk.java.net/~coleenp/8198720.01/webrev
>>> bug link https://bugs.openjdk.java.net/browse/JDK-8198720
>> The synopsis is misleading: it is not only obsoleting PrintSafepoint* options, it also reformats the
>> output!
>> We did JDK-8180482 not that long ago, and the reason was that both people and machine tools are
>> accustomed to the particular non-noisy format for that table. I am not at all convinced that
>> proposed format [2] is better than current version [3]. Can we keep (at least some resemblance of)
>> the old format, please?
>> -Aleksey
>> [1] https://bugs.openjdk.java.net/browse/JDK-8180482
>> [2] https://bugs.openjdk.java.net/secure/attachment/75330/out.safepoint-logging
>> [3] http://cr.openjdk.java.net/~shade/8180482/after.txt

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