title: What is the default nursery size for JRockit R27.6.0_1.6.0_05 when -XgcPrio:pausetime is used?
body: <p>JRockit <a href="http://download.oracle.com/docs/cd/E15289_01/doc.40/e15062/optionx.htm#i1011858" rel="nofollow">R28 documentation</a> says that the default value of nursery size (<code>-Xns</code>) is "10 MB per logical processor" when <code>-Xgc:pausetime</code> flag is used. <a href="http://download.oracle.com/docs/cd/E15289_01/doc.40/e15062/optionx.htm#i1021675" rel="nofollow">Elsewhere</a> in the same document, they say that <code>-XgcPrio</code> is now deprecated in favor of <code>-Xgc</code>, which from the look of things, is the same configuration.</p>
  
  <p>JRockit <a href="http://download.oracle.com/docs/cd/E13150_01/jrockit_jvm/jrockit/jrdocs/refman/optionX.html#wp999534" rel="nofollow">R27 documentation</a> says that the default value of nursery size (<code>-Xns</code>) is "50% of free heap" when <code>-Xgcprio:pausetime</code> flag is used.</p>
  
  <p>I have a customer using R27.6.0_1.6.0_05. I tested on R27.5.0-110_o-99226-1.6.0_03-20080528-1505-linux-ia32, R27.6.5-32_o-121899-1.6.0_14-20091001-2113-linux-ia32 and R28.1.0-123-138454-1.6.0_20-20101014-1350-linux-ia32 - the default nursery size seems to 10MB when <code>-XgcPrio:pausetime</code> is used. Unfortunately, I cannot find binary for the exact JRockit version from Oracle website. So, does anyone know what the default version nursery size is on R27.6.0_1.6.0_05? </p>
  
  <p>I am not familiar with JRockit, but I am surprised that a parameter such as this had a huge change in default value between two releases.</p>