Andy Pugh wrote: > 2010/1/5 Stephen Wille Padnos<spad...@sover.net>: > >>> That is normal if you use the ISOLCPUS option, the core dedicated to >>> the RT threads doesn't show up in the resource monitor. >>> >> Actually, that's not true. The core is still there, and is still >> monitored by the normal tools. The only thing ISOLCPUS does is tell the >> Linux scheduler not to put any tasks on that CPU by default. Tasks can >> still set their processor affinity to that CPU if they like, and those >> tasks will still show up in tools such as top. >> > What I was doing was repeating section 7.2 from that link, which > states that the system monitor will show the second CPU / Core at 0% > load, even though it is busy with the realtime tasks. > That certainly matches my experience with an SMP, RT kernel. I have 0% > load in System Monitor on CPU1, and CPU0 shows less load than before, > combined with a latency test that has dropped from 15,000 to about > 6,000. > Ah, I misinterpreted your statement then - sorry about that.
RT tasks don't show up on multiprocessor or uniprocessor systems, since they run in the kernel. (or I think that's the reason anyway) It doesn't have anything to do with SMP/UP. The isolated CPU still shows in the task monitor, and you can write non-RT programs that will run on that CPU (by setting processor affinity within the program), and will show up in top. The isolated core isn't actually "dedicated to RT threads", it's just hidden from the normal scheduler. A fine semantic point there :) - Steve ------------------------------------------------------------------------------ This SF.Net email is sponsored by the Verizon Developer Community Take advantage of Verizon's best-in-class app development support A streamlined, 14 day to market process makes app distribution fast and easy Join now and get one step closer to millions of Verizon customers http://p.sf.net/sfu/verizon-dev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
