Review request: 8013132: Add a flag to turn off the output of the verbose verification code

[Stefan Karlsson]

On 04/25/2013 08:20 AM, Bengt Rutisson wrote:
>
> Stefan,
>
> Looks good to me.

Thanks, Bengt.

StefanK

>
> Bengt
>
>
> On 4/24/13 8:12 PM, Stefan Karlsson wrote:
>> http://cr.openjdk.java.net/~stefank/8013132/webrev.00/
>>
>> This RFE adds a new flag named VerifySilently, which can be used to 
>> turn off the verbose output that the verification code produces. The 
>> proposed name has been chosen to match other Verify flags.
>>
>> From the Bug description:
>> ---
>> The HotSpot verification code is rather verbose and intrusive. I 
>> propose that we add a flag that can be used to turn this output off.
>>
>> An example of the verification output:
>> $ java -XX:+PrintGC -XX:+UnlockDiagnosticVMOptions 
>> -XX:+VerifyBeforeExit -XX:+VerifyAfterGC -XX:+VerifyBeforeGC 
>> -XX:+UseConcMarkSweepGC -XX:+ExplicitGCInvokesConcurrent -cp 
>> /localhome/tests/ HelloSystemGC
>>  VerifyBeforeGC:[Verifying threads heap concurrent mark-sweep 
>> generation par new generation remset syms strs zone dict cldg 
>> metaspace chunks hand C-heap code cache ]
>> [GC (System.gc()) 672K->260K(121600K), 0.0060920 secs]
>>  VerifyAfterGC:[Verifying threads heap concurrent mark-sweep 
>> generation par new generation remset syms strs zone dict cldg 
>> metaspace chunks hand C-heap code cache ]
>> [Verifying threads heap concurrent mark-sweep generation par new 
>> generation remset syms strs zone dict cldg metaspace chunks hand 
>> C-heap code cache ]
>> [GC (CMS Initial Mark) 260K(121600K), 0.0204040 secs]
>> [Verifying threads heap concurrent mark-sweep generation par new 
>> generation remset syms strs zone dict cldg metaspace chunks hand 
>> C-heap code cache ]
>> [Verifying threads heap concurrent mark-sweep generation par new 
>> generation remset syms strs zone dict cldg metaspace chunks hand 
>> C-heap code cache ]
>> [GC (CMS Final Remark) [Verifying CMS Marking... done] 
>> 1604K(121600K), 0.1008210 secs]
>> [Verifying threads heap concurrent mark-sweep generation par new 
>> generation remset syms strs zone dict cldg metaspace chunks hand 
>> C-heap code cache ]
>>
>> And with the proposed flag turned on:
>> [GC (System.gc()) 672K->269K(121600K), 0.0050710 secs]
>> [GC (CMS Initial Mark) 269K(121600K), 0.0203380 secs]
>> [GC (CMS Final Remark) 1613K(121600K), 0.1007210 secs]
>> ---
>>
>> thanks,
>> StefanK
>

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