Request for review: 6941923: RFE: Handling large log files produced by long running Java Applications

[yumin.qi at oracle.com]

  Current implementation will not work with outside tool, ostream_init 
called once in JVM starting and flags will not be changed rest of 
running supposedly. Now need to think of what if flags changed by 
outside tool.  Need reconsideration of changing flags from outside tool.

Thanks
Yumin

On 4/13/2011 8:47 AM, Jon Masamitsu wrote:
> Yasumasa ,
>
> Sounds like this is a request for an enhancement of the
> feature that Yumin has implemented.   Or rather maybe
> just a way of turning it on?  Or is it something more basic
> to the feature?
>
> Jon
>
> On 4/12/2011 5:55 PM, Yasumasa Suenaga wrote:
>> Hi Yumin,
>>
>> I would like to rotate GC log triggered by the outside.
>> I think that it can be implemented using AttachLister 
>> (AttachOperationFunctionInfo [])
>> and invoker tool.
>>
>> Could you examine it?
>>
>>
>> Best regards,
>>
>> Yasumasa
>>
>> (2011/04/13 3:41), yumin.qi at oracle.com wrote:
>>> http://cr.openjdk.java.net/~minqi/6941923/webrev.00/ 
>>> <http://cr.openjdk.java.net/%7Eminqi/6941923/webrev.00/>
>>>
>>> Summary:
>>>
>>> This is a RFE request for having a GC log rotation to prevent Java 
>>> application from over flooding disk with GC output running for long 
>>> time.
>>> In the implementation, supply three JVM options
>>> 1) -XX:+UseGCLogFileRotation must be used with -Xloggc:file
>>> 2) -XX:MaxGCLogFileNumbers= set limit of rotation file numbers, 
>>> default to 1, maximum set to 1024.
>>> 3) -XX:GCLogFileSize= can be configured by user how big the file 
>>> size should be. Default to 10M. Minimum set to 512K if given from 
>>> option is less than 512K.
>>>
>>> If MaxGCLogFileNumbers=1, rotating output in same file, i.e write 
>>> from beginning of the file when reach cap of the file; with 
>>> MaxGCLogFileNumbers > 1 rotating files sequentially after reach cap 
>>> in file, file.1, file.2, ..., file.<MaxGCLogFileNumbers-1> then back 
>>> to file, file.1, ...
>>> Check if rotation needed at safepoint ending.
>>>
>>> Tested with multiple GC choices.
>>>
>>> Thanks
>>> Yumin
>>>
>>>
>>>