Re: Controlling the garbage collector (GC) at RT?

[Hans Boehm <Hans dot Boehm at hp dot com>]

It seems to me that the only problem here is that this still
seems to happen with overcommit-accounting set to 2.

I would expect that you can reproduce this problem with a program
that alternately allocates a few MB with sbrk, and then touches the
allocated memory.  If you can't, there's something really weird going on
here.  If you can, it'll give you a test case for the kernel people.

Hans

On Wed, 16 Feb 2005, Martin Egholm Nielsen wrote:

> Hi Hans,
>
> >>>It would indeed be interesting to know why the Linux kernel
>  >>>kills the application rather than returning failure.
> >>Sure, but how to do that? Any guidelines?
> > What do you see on the console?  Anything in the system log?  Does
> > strace tell you anything?
> Below is the last part of "strace -f -F -i -v". It doesn't really look
> like there's anything of value?
>
> // Martin
>
> [pid    75] [0f833558] write(1, "*** MEM CHUNK TAKEN: 8388608\n", 29***
> MEM CHUNK TAKEN: 8388608
> ) = 29
> [pid    75] [0f839834] brk(0x12d15000)  = 0x12d15000
> [pid    75] [0f839834] brk(0x12d25000)  = 0x12d25000
> [pid    75] [0f81126c] getpid()         = 75
> [pid    75] [0f799444] kill(77, SIGPWR <unfinished ...>
> [pid    76] [0f840e2c] <... poll resumed> [{fd=3, events=POLLIN,
> revents=POLLIN}
> ], 1, 2000) = 1
> [pid    75] [0f799444] <... kill resumed> ) = 0
> [pid    76] [0f81127c] getppid()        = 75
> [pid    76] [0f833548] read(3,
> "\20\7/\234\0\0\0\4\17\374$0\20\7/\240$\0\0B\17\3
> 72j(\177"..., 148) = 148
> [pid    76] [0f840e2c] poll( <unfinished ...>
> [pid    75] [0f799444] kill(77, SIGXCPU) = 0
> [pid    75] [0f839834] brk(0x13525000)  = 0x13525000
> [pid    75] [0f833558] write(1, "*** MEM CHUNK TAKEN: 8388608\n", 29***
> MEM CHUNK TAKEN: 8388608
> ) = 29
> [pid    75] [0f839834] brk(0x13535000)  = 0x13535000
> [pid    75] [0f839834] brk(0x13545000)  = 0x13545000
> [pid    75] [0f839834] brk(0x13d45000)  = 0x13d45000
> [pid    75] [0f833558] write(1, "*** MEM CHUNK TAKEN: 8388608\n", 29***
> MEM CHUNK TAKEN: 8388608
> ) = 29
> [pid    76] [0f840e2c] <... poll resumed> [{fd=3, events=POLLIN}], 1,
> 2000) = 0
> [pid    76] [0f840e2c] --- SIGTERM (Terminated) ---
> #
>
>