[Interest] Program runs only on four core processors.... sometimes.

[Calogero Mauceri]

In your tests try to double check also the status of the machine TCP/UDP 
ports.
On Windows the commad should be

netstat -an

It helped me debugging an application I wrote that was consuming all the 
ports available in the machine
(opening and closing consecutively a huge amount of TCP connections).

Hope that helps,
Calogero


Il 21/03/2013 8.48, Till Oliver Knoll ha scritto:
> Am 20.03.2013 um 23:00 schrieb Guido Seifert <wargand at gmx.de>:
>
>> Hi,
>> I have here a strange problem. Probably not 100% ontopic for this list. But it is a Qt program. :-)
>>
>> My problem: I have three programs, which exchange data with a fourth program via tcp and udp. On my i7 and i5 with four cores it runs perfectly. It also runs perfectly on my partner's machines. Now I gave it to a few testers... and it was pure disaster. Bugs I have never seen before. From the description it seems to be some kind of deadlock. The main program just freezes.
> Now we assume it is a deadlock caused by some race conditions for some network (socket?) resources. But maye it is simply because the data is sometimes wrong? Imagine one service would send image data "worth 4 terrabytes" (because the "content size field" was wrongly set, or the height/width fields), so what would your main program do? Would it try to really create a QImage that large and hence be busy allocating virtual memory?
>
> That would be visible off course by its memory consumption which would grow and grow.
>
> Off course my guess totally does not explain why it would (seem to) work on some machines, and not on others (but that /could/ be a pure coincidence which would wrongly lead us to believe it must be a threading/deadlock problem).
>
> Cheers,
>    Oliver
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-- 
Calogero Mauceri
Software Engineer

Applied Coherent Technology Corporation (ACT)
www.actgate.com