Raymond Toy pushed to branch master at cmucl / cmucl

Commits: 9e4c9d0a by Raymond Toy at 2016-02-28T21:12:18-08:00 Reduce maximum heap size for Linux.

According to the message from Chisheng Huang on cmucl-help, 2016-02-27, 32-bit Ubuntu 11.10 (in VirtualBox) cannot use the full heap space. There's something already allocated at address 0xb7b82000, so limit the max heap to address 0xb7b80000, for a total of 1530 MB instead of 1632 MB.

(It would be nice to be able to detect this somehow.)

- - - - -

1 changed file:

- src/lisp/x86-validate-linux.h

Changes:

===================================== src/lisp/x86-validate-linux.h ===================================== --- a/src/lisp/x86-validate-linux.h +++ b/src/lisp/x86-validate-linux.h @@ -22,12 +22,21 @@ * 0x38000000->0x40000000 128M Control stack growing down. * 0x40000000->0x48000000 128M Reserved for shared libraries. * 0x58000000->0x58100000 16M Foreign Linkage Table - * 0x58100000->0xBE000000 1631M Dynamic Space. - * 0xBFFF0000->0xC0000000 Unknown Linux mapping + * 0x58100000->0xB7B00000 1530M Dynamic Space. + * 0xB7B82000->0xC0000000 Unknown Linux mapping, including stack * + * * (Note: 0x58000000 allows us to run on a Linux system on an AMD * x86-64. Hence we have a gap of unused memory starting at * 0x48000000.) + * + * It appears as if the actual upper limit depends on the particular + * Linux distribution. Ubuntu 11.10 (32-bit) appears to have + * something mapped at 0xb78b2000, so we can't allocate the dynamic + * space past that. That results in a max heap size of 1530 MB. + * However, Fedora 22 ther appears to be nothing mapped there. In + * fact it appears to be free all the way to 0xf7c1b000. That would + * allow a heap of size 2555 MB. */

#define READ_ONLY_SPACE_START (SpaceStart_TargetReadOnly) @@ -48,7 +57,7 @@ #define DYNAMIC_0_SPACE_START (SpaceStart_TargetDynamic)

#ifdef GENCGC -#define DYNAMIC_SPACE_SIZE (0x66000000) /* 1.632GB */ +#define DYNAMIC_SPACE_SIZE (0x5FA00000) /* 1.530GB */ #else #define DYNAMIC_SPACE_SIZE (0x04000000) /* 64MB */ #endif

View it on GitLab: https://gitlab.common-lisp.net/cmucl/cmucl/commit/9e4c9d0a4cd95d10dfded54586...