Hi Jack, This can be anywhere in your code. Why don't you compile it with debug symbols and run it through a debugger to see where the segmentation fault occurred. This is most likely an invalid pointer being used by your code. Matthias On 25 Jul 2010, at 22:57, Jack Bryan wrote:

Dear All,

I run a 6 parallel processes with boost MPI on a system with OpenMPI.

When the run-time of the program is short, it works well.

But, if the run-time is long, I got errors:

[n124:45521] *** Process received signal *** [n124:45521] Signal: Segmentation fault (11) [n124:45521] Signal code: Address not mapped (1) [n124:45521] Failing at address: 0x44 [n124:45521] [ 0] /lib64/libpthread.so.0 [0x3c50e0e4c0] [n124:45521] [ 1] /lib64/libc.so.6(strlen+0x10) [0x3c50278d60] [n124:45521] [ 2] /lib64/libc.so.6(_IO_vfprintf+0x4479) [0x3c50246b19] [n124:45521] [ 3] /lib64/libc.so.6(_IO_printf+0x9a) [0x3c5024d3aa] [n124:45521] [ 4] /home/path/exec [0x40ec9a] [n124:45521] [ 5] /lib64/libc.so.6(__libc_start_main+0xf4) [0x3c5021d974] [n124:45521] [ 6] /home/path/exec [0x401139] [n124:45521] *** End of error message ***

It seems that there may be some problems about memory management.

But, I cannot find the reason.

My program needs to write results to some files.

If I open the files too many without closing them, I may get the above errors.

But, I have removed the writing files from my program.

The problem appears again when the program runs longer time.

Any help is appreciated.

Jack

July 25 2010

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