This is a known problem (see http://www.chess960athome.org/alpha/forum_thread.php?id=93#1237). Although BOINC applications must be single-threaded, Chess960 applications for Linux end up spawning two threads and BOINC is unaware of it. Therefore, Chess960 will eat up CPU time from other projects running at the same time.

HTH
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Instead of try to restrict to one core, instead restrict cpu time to 50%
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I only have one processor and have no problems. The latest Bonic is 5.8.16 try upgrading.

Forgive me, but since you only have one processor I don't see the relevance of your not having any problems. The 64 bit Boinc I have is the most up-to-date for my distribution and since work units for other projects didn't have this issue, I think it's unlikely that an upgrade would solve the problem.

Richard said

I am still unable to get Chess960 to work on one processor only.

I took that to mean he couldn't run at all. My mistake.

Since Chess comes with short deadlines, depending on his connect setting, he may be going into panic mode (EDF)

Try setting cc_config.xml
<cc_config>
<log_flags>
<cpu_sched_debug>1</cpu_sched_debug>
</log_flags>
</cc_config>

You'll probably see
2007-06-02 09:33:46 [chess960@home alpha] [cpu_sched_debug] Project has 5 projected deadline misses

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Hi Richard,

since Chess is in Alpha stage, this might simply be a bug. But I wouldnt detach from Chess then the weather should get too hot. Suspending Chess should be fine, too!

You could also use Threadmaster to limit the cpu usage and still be able to use both cores.

How hot is your cpu becoming anyway? My AMD X2 4800+ is overclocked to 2.8GHz and running at 44 degrees under full load at 25 degrees room temp (aka warm weather).
(Use Speedfan to check temps)

Up to 50 degrees are really ok! Are you running BOINC 24/7?
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I only have one processor and have no problems. The latest Bonic is 5.8.16 try upgrading.

Forgive me, but since you only have one processor I don't see the relevance of your not having any problems. The 64 bit Boinc I have is the most up-to-date for my distribution and since work units for other projects didn't have this issue, I think it's unlikely that an upgrade would solve the problem.

Also for the last several days all WUs were hanging at the 98% mark (no cpu usage.) I rebooted and now they complete normally.

I mostly don't have any problems running work units. From time to time one unit seems to hog the CPU without appearing to do work (according to BOINC Manager) and in this case I just abort the job and everything returns to normal. Oddly, the symptom of this is that gkrellm shows the job just running on one processor :-( Aaarrrgh.

I guess I'll just detach when the weather gets hot.



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I am still unable to get Chess960 to work on one processor only. Although I'm not running them at the moment, both SETI and SIMAP have worked fine on just one processor, but Chess960 insists on using two.

As the weather warms up I'm quite keen to move to just one, so as not to overheat.

I'm using Ubuntu 7.10, with 2.6.20-15-generic on an AMD64 X2. Boinc is 5.4.11-5 in the Ubuntu distribution.

Is anyone else, on a similar CPU, able to use just one processor?

I only have one processor and have no problems. The latest Bonic is 5.8.16 try upgrading.

Since I have Bonic set to connect every 4 days and all WUs have a deadline of ~24hours, 1) all WU's I return should be beyond the deadline, and 2) Chess960 shouldn't be giving me any WU's

Also for the last several days all WUs were hanging at the 98% mark (no cpu usage.) I rebooted and now they complete normally.
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I am still unable to get Chess960 to work on one processor only. Although I'm not running them at the moment, both SETI and SIMAP have worked fine on just one processor, but Chess960 insists on using two.

As the weather warms up I'm quite keen to move to just one, so as not to overheat.

I'm using Ubuntu 7.10, with 2.6.20-15-generic on an AMD64 X2. Boinc is 5.4.11-5 in the Ubuntu distribution.

Is anyone else, on a similar CPU, able to use just one processor?

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