Re: [Condor-users] First go at standard Universe checkpointing

[Ian Cottam <Ian.Cottam@xxxxxxxxxxxxxxxx>]

Thanks. Am running 64bit.
Will try tomorrow when back at work.
cheers!
-Ian

On 10/01/2011 16:48, "Daniel Forrest" <dan.forrest@xxxxxxxxxxxxx> wrote:

>On Mon, Jan 10, 2011 at 03:58:02PM +0000, Ian Cottam wrote:
>> I'm trying to get my first Standard Universe job working, because of
>> checkpointing (Condor 7.4.4 RedHat build).
>> 
>> I've replicated the problems I'm having by means of a tiny C program.
>> Said problems being...
>> - the check point file ends in .tmp and seems far too small; and
>> - when I restart the test case it immediately seg faults.
>> 
>> Any ideas?
>> 
>> Test code looks like this----
>> #include <stdio.h>
>> #include <math.h>
>> int main(void)
>> {
>>  int i; double x;
>>  FILE *f= fopen("r-out.txt", "w");
>>  fputs("hello Condor Standard Universe - starting\n", f);
>>  for (i= -500000000; i != 500000000; ++i) {
>>   x= sqrt(i<0?-i:i); /* kill some time */
>>  }
>>  fputs("finished OK\n", f);
>>  return 0;
>> }
>> 
>> 
>> ---
>> 
>> Compiled with---
>> condor_compile gcc cctest.c -o cctest -lm
>> ---
>> I'm testing by just doing a standalone
>> ./cctest
>> 
>> Followed by a control-Z to make it checkpoint and quit.
>
>This is due to address space randomization and the virtual memory
>layout (placement of the VDSO).  Run it like this:
>
>setarch i386 -R -L ./cctest
>
>
>And restart it like this:
>
>setarch i386 -R -L ./cctest -_condor_restart cctest.ckpt
>
>
>This assumes you are running 32-bit, but I would bet you are.
>
>-- 
>Dan