[Jikesrvm-researchers] Fixed-Sized Generational GC in RVM

[Wei H. <hua...@ia...>]

Hi,
  The memory manager of Jikes RVM seems to have problem in running =
fixed-sized Generation GC (using -X:nh). After looking through the code, =
I found that the nursery size provided in command line can not be passed =
to the memory manager as expected. The steps to fix it are provided as =
follows. Similar procedure can also be used to fix the problem of =
permanent heap size (-X:ph).=20
  Hope the information is helpful to others who have encountered similar =
problems.

Wei Huang

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
1. Files need to be modifed=20
RunBootImage.c=20
VM_CommandLineArgs.java=20

2. How to modify VM_CommandLineArgs.java

diff VM_CommandLineArgs.java ~/rvmRoot/rvm/src/tools/bootImageRunner/
95a96
>     public static final int NURSERY_HEAP_ARG     =3D39;
167a169
>     new Prefix("-X:nh=3D",                NURSERY_HEAP_ARG),
625c627,631
<
---
>         case NURSERY_HEAP_ARG:
>           //-#if RVM_WITH_JMTK
>           VM_Interface.processCommandLineArg("nursery_size=3D" + arg);
>           //-#endif
>           break;
   =20
3. How to modify RunBootImage.c=20
There is a typo with this file. Authors seem to forget add the token of =
nursery argument into the Arguments. What we need is to add the =
following code

-bash-2.05b$ diff RunBootImage.C =
~/rvmRoot/rvm/src/tools/bootImageRunner/RunBootImage.C
360a361
>       JCLAs[n_JCLAs++]=3Dtoken;
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D