Enabling non product flags like "Verbose" in GC Code

Ramki Ramakrishna y.s.ramakrishna at oracle.com
Thu Aug 25 15:21:10 PDT 2011


i don't know about that (maybe someone on the list knows where one
can download pre-built non-product binaries from), but if you are set up to
build hotspot, you would use target fastdebug.

-- ramki

On 8/25/2011 2:34 PM, suraj puvvada wrote:
> Thanks.
>
> Are the non-product builds available online to download ?
>
> -Suraj
>
> On Thu, Aug 25, 2011 at 1:37 PM, Ramki Ramakrishna 
> <y.s.ramakrishna at oracle.com <mailto:y.s.ramakrishna at oracle.com>> wrote:
>
>     Hi Suraj --
>
>     Either:
>
>     (1) use a non-product build where the flag is available, OR
>
>     (2) rebuild with Verbose declared a product flag (but you will
>     have to deal with
>          develop->product contagion which will require more such
>     changes), OR
>
>     (3) (probably the easiest in a specific product build) rebuild
>     with Verbose changed to
>           a new product flag of your choice for the specific sites
>     where you want to print the info
>           but want to retain the option of turning it off. Depending
>     on where you do this, this
>           may also cause a develop->product contagion, but it will be
>     a more controlled burn, if
>           i may be allowed to mix my metaphors.
>
>     (..) anything else?
>
>     The above are all one-off's for use in a specific build.
>
>     There may be good reason to protect some of these more useful
>     messages with a product
>     flag rather than with a develop flag. I recall Krystal Mok also
>     mentioning something similar.
>     Perhaps the community can work on what are the kinds of messages
>     one might want to
>     see in production (under control of a suitable manageable/product
>     flag), and submit an OpenJDK
>     patch with those changes (hopefully the performance impact of the
>     check or enablement
>     will be minor enough when these changes are for example
>     communicating ergonomic
>     decisions etc. -- this should of course be performance checked
>     before a patch is submitted).
>
>     I'm also hoping that in the future some of these may be captured
>     by the logging framework
>     under construction. Those working on or planning to work on the
>     logging framework may hav
>      more to add. So I am cc'ing the serviceability alias as well.
>
>     -- ramki
>
>
>     On 8/25/2011 12:58 PM, suraj puvvada wrote:
>>     Hi,
>>
>>     How can I enable DEVELOP mode flags like "Verbose" ? I'm
>>     interested in seeing what the GC code logs - for example :
>>
>>     if (PrintGCDetails && Verbose) {
>>          
>>     gclog_or_tty->print_cr("ConcurrentMarkSweepGeneration::shrink_by:"
>>             " desired_bytes " SIZE_FORMAT
>>             " shrinkable_size_in_bytes " SIZE_FORMAT
>>             " aligned_shrinkable_size_in_bytes " SIZE_FORMAT
>>             "  bytes  " SIZE_FORMAT,
>>             desired_bytes, shrinkable_size_in_bytes,
>>             aligned_shrinkable_size_in_bytes, bytes);
>>           gclog_or_tty->print_cr("          old_end  " SIZE_FORMAT
>>             "  unallocated_start  " SIZE_FORMAT,
>>             old_end, unallocated_start);
>>         }
>>
>>
>>     -Suraj
>
>
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