Who hates the *Ratio parameters?

[Tony Printezis]

Paul,

Paul Hohensee wrote:
> I would.  I'd use "SurvivorPercent" though, not "SurvivorPerc".  The 
> latter
> sounds like a bonus you get for surviving. :)
I was trying to be a be concise, but sure Percent is fine.
> Or maybe just add "SurvivorSize" and "MaxSurvivorSize", like we have
> "NewSize" and "MaxNewSize".  That'd be exact, unlike either a percent
> or a ratio.
Well, the problem with using specific sizes is that, if you resize your 
young gen (in this case), the survivor size will also have to change. 
Maybe, using percentages will handle that case a bit better (even though 
I can think of some cases when you want to fix the survivor size but 
maybe vary the eden size).
> btw, we seem to use the term "Ratio" to mean both a genuine ratio _and_ a
> percent.  E.g., "SurvivorRatio" is a genuine ratio, but 
> "MinHeapFreeRatio"
> is a percent.
Yep. Unfortunately, we cannot change the meaning of MinHeapFreeRatio (to 
keep backwards compatibility). So, maybe, it'd be best to introduce a 
new parameter, say MinHeapFreePercent, with the same semantics as 
MinHeapFreeRatio, as a way to start migrating users to the correct one.

Tony
> Tony Printezis wrote:
>> Hi all,
>>
>> I personally don't like the *Ratio parameters (e.g., 
>> -XX:SurvivorRatio=<N>) as I don't think they are very intuitive to 
>> set. I've heard the same from a few customers too. Would most people 
>> prefer parameters based on percentages (e.g., -XX:SurvivorPerc=<N>, 
>> where 0 <= <N> <= 100) instead?
>>
>> Tony
>>
>>   

-- 
----------------------------------------------------------------------
| Tony Printezis, Staff Engineer    | Sun Microsystems Inc.          |
|                                   | MS BUR02-311                   |
| e-mail: tony.printezis at sun.com    | 35 Network Drive               |
| office: +1 781 442 0998 (x20998)  | Burlington, MA01803-0902, USA  |
----------------------------------------------------------------------
e-mail client: Thunderbird (Solaris)


_______________________________________________
hotspot-gc-use mailing list
hotspot-gc-use at openjdk.java.net
http://mail.openjdk.java.net/mailman/listinfo/hotspot-gc-use