* Re: ulimit strangeness
[not found] <1021114164332.ZM7641@candle.brasslantern.com>
@ 2002-11-15 11:55 ` Peter Stephenson
2002-11-15 12:57 ` jarausch
2002-11-16 3:13 ` Bart Schaefer
0 siblings, 2 replies; 4+ messages in thread
From: Peter Stephenson @ 2002-11-15 11:55 UTC (permalink / raw)
To: Zsh hackers list
"Bart Schaefer" wrote:
> zsh% ulimit -v $[200*1024]; limit
> cputime unlimited
> filesize unlimited
> datasize unlimited
> stacksize 8MB
> coredumpsize unlimited
> memoryuse unlimited
> maxproc 2040
> descriptors 1024
> memorylocked unlimited
> addressspace 200kB <-- Note, not 200 megabytes!
>
> It looks like this has something to do with the convoluted #ifdef that
> prevents duplicate case labels in rlimits.c when both RLIMIT_RSS and
> RLIMIT_VMEM are defined, but I haven't yet figured out what to fix.
My guess is the test `RLIMIT_RSS != RLIMIT_VMEM' is incorrectly failing
in the preprocessor, i.e. it thinks RLIMIT_RSS == RLIMIT_VMEM owing to
the way the definitions are laid out. Checking
/usr/include/sys/resource.h or carefully hidden equivalent should
confirm or refute this. The following programme might help.
#include <stdio.h>
#include <sys/resource.h>
int main(int argc, char **argv)
{
#if defined(RLIMIT_RSS) && defined(RLIMIT_VMEM)
printf("You have both definitions.\n");
if (RLIMIT_RSS == RLIMIT_VMEM)
{
printf("Both have the same value.\n");
}
else
{
printf("They have different values.\n");
#if RLIMIT_RSS == RLIMIT_VMEM
printf("!!!You should never see this message!!!\n");
#endif
}
#else
#ifdef RLIMIT_RSS
printf("You only have RSS\n");
#else
#ifdef RLIMIT_VMEM
printf("You only have VMEM\n");
#else
printf("You have neither definition.\n");
#endif
#endif
#endif
return 0;
}
We could probe this more reliably than at present in configure.
--
Peter Stephenson <pws@csr.com> Software Engineer
CSR Ltd., Science Park, Milton Road,
Cambridge, CB4 0WH, UK Tel: +44 (0)1223 692070
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: ulimit strangeness
2002-11-15 11:55 ` ulimit strangeness Peter Stephenson
@ 2002-11-15 12:57 ` jarausch
2002-11-16 3:13 ` Bart Schaefer
1 sibling, 0 replies; 4+ messages in thread
From: jarausch @ 2002-11-15 12:57 UTC (permalink / raw)
To: pws; +Cc: zsh-workers
On 15 Nov, Peter Stephenson wrote:
> "Bart Schaefer" wrote:
>> zsh% ulimit -v $[200*1024]; limit
>> cputime unlimited
>> filesize unlimited
>> datasize unlimited
>> stacksize 8MB
>> coredumpsize unlimited
>> memoryuse unlimited
>> maxproc 2040
>> descriptors 1024
>> memorylocked unlimited
>> addressspace 200kB <-- Note, not 200 megabytes!
>>
>> It looks like this has something to do with the convoluted #ifdef that
>> prevents duplicate case labels in rlimits.c when both RLIMIT_RSS and
>> RLIMIT_VMEM are defined, but I haven't yet figured out what to fix.
>
> My guess is the test `RLIMIT_RSS != RLIMIT_VMEM' is incorrectly failing
> in the preprocessor, i.e. it thinks RLIMIT_RSS == RLIMIT_VMEM owing to
> the way the definitions are laid out. Checking
> /usr/include/sys/resource.h or carefully hidden equivalent should
> confirm or refute this. The following programme might help.
>
> #include <stdio.h>
> #include <sys/resource.h>
>
> int main(int argc, char **argv)
> {
> #if defined(RLIMIT_RSS) && defined(RLIMIT_VMEM)
> printf("You have both definitions.\n");
> if (RLIMIT_RSS == RLIMIT_VMEM)
> {
> printf("Both have the same value.\n");
> }
> else
> {
> printf("They have different values.\n");
> #if RLIMIT_RSS == RLIMIT_VMEM
> printf("!!!You should never see this message!!!\n");
> #endif
> }
> #else
> #ifdef RLIMIT_RSS
> printf("You only have RSS\n");
> #else
> #ifdef RLIMIT_VMEM
> printf("You only have VMEM\n");
> #else
> printf("You have neither definition.\n");
> #endif
> #endif
> #endif
>
> return 0;
> }
>
> We could probe this more reliably than at present in configure.
>
Here on my machine (Linux-From-Scratch 2.4.20-rc1 glibc 2.2.5) I get
You only have RSS.
Thanks,
Helmut Jarausch
Lehrstuhl fuer Numerische Mathematik
Aachen University
D 52056 Aachen, Germany
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: ulimit strangeness
2002-11-15 11:55 ` ulimit strangeness Peter Stephenson
2002-11-15 12:57 ` jarausch
@ 2002-11-16 3:13 ` Bart Schaefer
2002-11-18 10:31 ` Peter Stephenson
1 sibling, 1 reply; 4+ messages in thread
From: Bart Schaefer @ 2002-11-16 3:13 UTC (permalink / raw)
To: Zsh hackers list
On Nov 15, 11:55am, Peter Stephenson wrote:
} Subject: Re: ulimit strangeness
}
} "Bart Schaefer" wrote:
} > It looks like this has something to do with the convoluted #ifdef that
} > prevents duplicate case labels in rlimits.c when both RLIMIT_RSS and
} > RLIMIT_VMEM are defined, but I haven't yet figured out what to fix.
}
} My guess is the test `RLIMIT_RSS != RLIMIT_VMEM' is incorrectly failing
} in the preprocessor, i.e. it thinks RLIMIT_RSS == RLIMIT_VMEM owing to
} the way the definitions are laid out.
No, it's this, in Src/system.h:
/* we use the SVR4 constant instead of the BSD one */
#if !defined(RLIMIT_NOFILE) && defined(RLIMIT_OFILE)
# define RLIMIT_NOFILE RLIMIT_OFILE
#endif
#if !defined(RLIMIT_VMEM) && defined(RLIMIT_AS)
# define RLIMIT_VMEM RLIMIT_AS
#endif
So RLIMIT_VMEM *is* defined, and is not the same as RLIMIT_RSS, and ...
--
Bart Schaefer Brass Lantern Enterprises
http://www.well.com/user/barts http://www.brasslantern.com
Zsh: http://www.zsh.org | PHPerl Project: http://phperl.sourceforge.net
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: ulimit strangeness
2002-11-16 3:13 ` Bart Schaefer
@ 2002-11-18 10:31 ` Peter Stephenson
0 siblings, 0 replies; 4+ messages in thread
From: Peter Stephenson @ 2002-11-18 10:31 UTC (permalink / raw)
To: Zsh hackers list
"Bart Schaefer" wrote:
> #if !defined(RLIMIT_VMEM) && defined(RLIMIT_AS)
> # define RLIMIT_VMEM RLIMIT_AS
> #endif
>
> So RLIMIT_VMEM *is* defined, and is not the same as RLIMIT_RSS, and ...
Then it shouldn't trigger the problem --- the 1024 factor should be
applied.
--
Peter Stephenson <pws@csr.com> Software Engineer
CSR Ltd., Science Park, Milton Road,
Cambridge, CB4 0WH, UK Tel: +44 (0)1223 692070
**********************************************************************
The information transmitted is intended only for the person or
entity to which it is addressed and may contain confidential
and/or privileged material.
Any review, retransmission, dissemination or other use of, or
taking of any action in reliance upon, this information by
persons or entities other than the intended recipient is
prohibited.
If you received this in error, please contact the sender and
delete the material from any computer.
**********************************************************************
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2002-11-18 10:32 UTC | newest]
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[not found] <1021114164332.ZM7641@candle.brasslantern.com>
2002-11-15 11:55 ` ulimit strangeness Peter Stephenson
2002-11-15 12:57 ` jarausch
2002-11-16 3:13 ` Bart Schaefer
2002-11-18 10:31 ` Peter Stephenson
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