topic Re: software crash in Operating System - OpenVMS

software crash

tianbinraindrop — Tue, 26 Apr 2005 20:00:24 GMT

hello,everyone.
I had a multithread program and run normally long,but will crash sometime.I find it's working set and virtual pages increased quickly before die.why?
My openvms version is 7.3.and I use c++ to write posix thread code.

Re: software crash

Travis Craig — Tue, 26 Apr 2005 21:14:35 GMT

Tianbinraindrop,

Is there any error status code output by your program when it crashes? Is it crashing due to exhausting its virtual address space or page file quota, or is it already crashing and then using more virtual pages as part of crashing?

Are there exit handlers or exeception handlers that run? They could use a lot of memory from the heap, increasing the working set and virtual pages.

Checking your quotas, in general, might show you the answer to your problem.

--Travis Craig

Re: software crash

Volker Halle — Wed, 27 Apr 2005 01:12:09 GMT

tianbinraindrop,

if you could further define what you mean with 'crash' and if you could provide the output from any error message when your program 'crashes', maybe we could help better than with pure speculation.

If you run your program after a SET PROC/DUMP, do you get a process dump (imagename.DMP in current directory) ? Can you look at that process dump with ANAL/PROC imagename.DMP ?

Volker.

Re: software crash

Willem Grooters — Wed, 27 Apr 2005 03:28:35 GMT

Apart what the others already stated (both VERY true) this gives me some clue:

Since you use C++, just a wild guess:

If, within a loop, objects are created, and the loop runs wild at some point (due, for instance, by bad, or no, error handling) it may cause this problem. Quite likely you'll run out of virtualpagecount. It _might_ be (depending on your settings) that Accounting holds a clue as well.

There have been some issues with threading in the past - check for patches on threads (IIRC, the patches reqquired hold the string PTHREAD in the name) and install them.

Re: software crash

Jan van den Ende — Wed, 27 Apr 2005 04:02:46 GMT

tianbinraindrop,

Let me start with:

WELCOME to the VMS forum!

On your problem:

My openvms version is 7.3.

I strongly advise that you upgrade your OS!

When 7.3 was released, it was termed a "Evaluation Release - do not use for production".
And although my best guess is that Willem probably is right, the later versions of VMS (7.3-2 and 8.2 are now current) offer several improvements.

Success.

Proost have one on me.

jpe