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Java Forum / Virtual Machine / March 2006Java heap size not a power of 2
Hi, Does anyone know of any performance or other issue if java min and max heap size is set to a value other than the power of 2 (for example, 1536 mb)? Thanks, Akash. > Hi, > > Does anyone know of any performance or other issue if java min and max > heap size is set to a value other than the power of 2 (for example, > 1536 mb)? Probably depends on the architecture. A machine which is trinary based would probably work better with a heap size set to a value that is a power of 3, for example. - Oliver Its a Sun Sparc machine running Solaris 8. So, it is binary. Any known issues? > > Hi, > > [quoted text clipped - 7 lines] > > - Oliver > Its a Sun Sparc machine running Solaris 8. So, it is binary. Any known > issues? Couldn't find any issues, but that doesn't mean there aren't any. You might want to take a look at http://www.oreilly.com/catalog/spt2/chapter/ch04.html#72236 and http://java.sun.com/docs/hotspot/gc1.4.2/ - Oliver > Probably depends on the architecture. A machine which is trinary > based would probably work better with a heap size set to a value that is > a power of 3, for example. > > - Oliver hey...Oliver, can you post some good brands of trinary machines? i'd like to get me one those.... - nate >> Probably depends on the architecture. A machine which is trinary based >> would probably work better with a heap size set to a value that is a [quoted text clipped - 3 lines] > > i'd like to get me one those.... I strongly recommend the Setun. - Oliver >> hey...Oliver, can you post some good brands of trinary machines? > > I strongly recommend the Setun. > > - Oliver ...;-) very interesting! - nate > Does anyone know of any performance or other issue if java min and max > heap size is set to a value other than the power of 2 (for example, > 1536 mb)? I'm not expert on the details, I doubt if there are any issues. As far as I know, those numbers do not translate directly into sizes of actual data-structures, but set the extrema for the totals used by quite a large number of separate sub-structures (which are not even necessarily contiguous in the JVM's address space). -- chris Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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