On Sat, May 30, 2009 at 7:21 AM, Kiran Kedlaya <ksk...@gmail.com> wrote:
>
>
>
> On May 29, 1:50 pm, William Stein <wst...@gmail.com> wrote:
>> 2009/5/29 Kiran Kedlaya <ksk...@gmail.com>:
>>
>>
>>
>>
>>
>> > On Apr 14, 3:47 pm, William Stein <wst...@gmail.com> wrote:
>> >> On Tue, Apr 14, 2009 at 12:30 PM, Kiran Kedlaya <ksk...@gmail.com> wrote:
>>
>> >> > I see 100% CPU usage when the notebook is processing a cell. I don't
>> >> > remember whether I still have it when a worksheet is open but idle.
>>
>> >> > Kiran
>>
>> >> For the record, I definitely don't see that (I just checked now) and
>> >> in fact I've never seen that on any OS/hardware combination ever.
>>
>> >> Could you make the above statement *precise*:
>> >> - what OS/hardware?
>> >> - what process(es) are 100% utilizing the CPU, exactly? (obviously
>> >> at least one should be!)
>>
>> >> etc.
>>
>> >> -- William
>>
>> > I'm seeing this on a 64-bit Opteron box running Fedora 10. When I run
>> > top, I see a "python" process at 100% CPU.
>>
>> What is "this" precisely? Is it "I see 100% CPU usage when the
>> notebook is processing a cell."? Since you *should* see 100% when
>> Sage is doing a calculation.
>>
>>
> I just tried a test with 3.4.1, and I was seeing 100% CPU usage (and
> impressive memory usage) even when the notebook was idle. This is a
> Fedora 64 system, so I also tried using a patched 4.0.rc1 that
> upgraded python to 2.5.4 (since that fixed other memory issues); that
> way, I don't see any CPU usage on idle, but when I try to evaluate 2+2
> I get 90+% CPU usage for 10+ seconds
Does that happen *every* time, or just the first time?
.
>
> It also takes much longer to start and stop the notebook on this
> system than, say, on sage.math (20+ seconds versus maybe 2 seconds),
> out of proportion to the CPU speeds of the machines.
Maybe your filesystem is slow? Are you using nfs?
William
>
> In case it helps, I tried prun on the notebook and got this back:
>
> ncalls tottime percall cumtime percall filename:lineno
> (function)
> 1 153.810 153.810 153.810 153.810 {posix.system}
> 1 25.122 25.122 25.128 25.128 {cPickle.dumps}
> 1 1.977 1.977 1.980 1.980 notebook.py:2278
> (load_notebook)
> 1 0.468 0.468 26.302 26.302 notebook.py:1643(save)
> 3 0.418 0.139 0.418 0.139 {method 'close' of
> 'file' objects}
> 1 0.156 0.156 182.257 182.257 run_notebook.py:49
> (notebook_twisted)
> 1853 0.124 0.000 0.124 0.000 {method 'write' of
> 'file' objects}
> 1852 0.083 0.000 0.083 0.000 {method 'read' of 'file'
> objects}
> 4 0.030 0.007 0.030 0.007 {open}
> 1 0.023 0.023 0.187 0.187 shutil.py:23
> (copyfileobj)
> 1 0.016 0.016 0.016 0.016 {posix.chmod}
> 2 0.014 0.007 0.014 0.007 {posix.rename}
> 72 0.003 0.000 0.006 0.000 worksheet.py:1932
> (__getstate__)
> 72 0.003 0.000 0.003 0.000 worksheet.py:1990
> (__setstate__)
>
> (et cetera)
>
> Kiran
> >
>
--
William Stein
Associate Professor of Mathematics
University of Washington
http://wstein.org
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