Messages in this thread | | | Subject | Re: Threading... | From | Arjan van de Ven <> | Date | Fri, 19 Jan 2007 19:55:41 +0100 |
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On Fri, 2007-01-19 at 10:43 -0800, Brian McGrew wrote: > I have a very interesting question about something that we're seeing > happening with threading between Fedora Core 3 and Fedora Core 5. Running > on Dell PowerEdge 1800 Hardware with a Xeon processor with hyper-threading > turned on. Both systems are using a 2.6.16.16 kernel (MVP al la special). > > We have a multithreaded application that starts two worker threads. On > Fedora Core 3 both of these we use getpid() to get the PID of the thread and > then use set_afinity to assign each thread to it's own CPU. Both threads > run almost symmetrically even on their given CPU watching the system > monitor.
this is odd; even in FC3 getpid() is supposed to return the process ID not the thread ID
> What am I missing? What do I need to do in FC5 or the kernel or the > threading library to get my threads to run in symmetric parallel again???
you should fix the app to use something like pthread_self() instead... (or the highly unportable gettid() but that would just be horrible)
-- if you want to mail me at work (you don't), use arjan (at) linux.intel.com Test the interaction between Linux and your BIOS via http://www.linuxfirmwarekit.org
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