Re: 100% CPU Utilization, looping with gettimeofday calls

On Sun, 20 Sep 2009 20:06:47 +0200, Witold Baryluk  
<[email protected]> wrote:

> Dnia 2009-08-24, pon o godzinie 14:42 +0200, Ruari Ødegaard pisze:
>> On Thu, 20 Aug 2009 14:01:43 +0200, Witold Baryluk
>> <[email protected]> wrote:
>>
>> > Dnia 2009-08-19, śro o godzinie 13:55 +0200, Ruari Ødegaard pisze:
>> >> On Wed, 19 Aug 2009 12:34:29 +0200, Witold Baryluk
>> >> <[email protected]> wrote:
>> >>
>> >> Hi Witold,
>> >>
>> >> > Hi guys.
>> >> >
>> >> > I was reporting this bug many times. But still probably
>> >> > Opera developers are ignoring this.
>> >> >
>> >> > Opera is running tight loop with millions of gettimeofday calls.
>> >> >
>> >> >  
>> http://smp.if.uj.edu.pl/~baryluk/opera10_few_seconds_of_strace.txt.gz
>> >> >
>> >> > This is present sine 9.6x series, and is present in all snapshots,
>> >> > including Beta3 and 4546.
>> >>
>> >> Below is some information from Arjan van Leeuwen,
>> >>
>> >> "Unfortunately, this information is not useful to developers.  
>> Although
>> >> the
>> >> gettimeofday() calls are the only thing you can see with strace  
>> (since
>> >> there are no other system calls), they are not what is causing the  
>> 100%
>> >> CPU usage. And since no one at Opera has ever reproduced this bug,  
>> it's
>> >> pretty difficult to see what's going on on your system.
>> >>
>> >> "What might help is to create a crash log for Opera once this is
>> >> happening.
>> >> To do this, wait until you are in this situation, and then send  
>> Opera a
>> >> SIGABRT signal using kill. This should trigger the crash report  
>> dialog.
>> >> Make sure to describe the situation you are in within the crash  
>> report,
>> >> tell
>> >> us it's a freeze and not a crash, and provide your email address so  
>> that
>> >> we can contact you for further details. You can send several reports
>> >> like
>> >> this - they are likely to be different, and one of them might provide
>> >> the
>> >> hint that is needed."
>> >>
>> >
>> > Hi, i prepared simple script, which:
>> > 1. restores ~/.opera (rsync with another 700MB directory)
>> > 2. starts opera with no tabs
>> > 3. measure CPU utilisation of opera
>> > 4. sends ABRT, wait, and send it again
>> > 5. copy crash report
>> > 6. kill all operas
>> > 7. goto 1
>> >
>> >
>> >
>> > Now i have about 200 crash reports, and about 100 of them
>> > have this problem with high CPU utilisation. (in top it is 85%,
>> > in ps it is about 50-60^).
>> >
>> > I have posted another post but it is awaiting moderation (it have  
>> 26KB)
>> >
>> > Where to send this crash report files crash*.txt ?
>> > I can provide them to trusted Opera developer using my HTTP server.
>> > It is 90MB uncompressed now.
>>
>> Considering your method I doubt there is that much variation. Send me  
>> the
>> first 5 and I'll have a look to see.
>>
>
> I send you this data about month ago, any progress. AFAIK nobody from
> Opera even downloaded this data from my server.

I have been on holiday most of that time and this is not the only issue I  
am looking at. Also I was expecting you to send me 5 hand picked samples  
directly as I suggested above, rather than a URL you sent with a link 50+.  
I guess we misunderstood what the other expected.

> Of course newest versions of opera is still having this problem.

We still do not have a way to reliably reproduce, nor a full understanding  
of what is going on fromthe bug reports. Hence we can't fix this until we  
understand what is broken. In addition, I should remind you that the vast  
majority of users don't have this issue, hence whilst I completely  
understand that this is very high priority for you it is not the number  
one issue we are looking at right now and hence does not trump all other  
work we are doing.

I have quickly scanned your data now. It doesn't look like your method to  
automate collection was as useful as would be hoped given that none of  
these display 100% CPU utilization (like your original description),  
albeit they are often very high (e.g. several are at 70%+). That said, we  
are not done looking through what you have provided. I may need you to run  
a couple more tests or tell me more about your setup but I'll come back to  
you on that. Thanks for all your assistance so far, it is appreciated!

I'll send you an email directly as well.

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