Re: 100% CPU Utilization, looping with gettimeofday calls

Dnia 2009-09-21, pon o godzinie 09:46 +0200, Ruari Ødegaard pisze:
> 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.
> 
I completly uderstand this. I just was hoping for some acknowledge. 
Thanks you for information.

> > 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 also understand this. I want to provide useful information when
possible.

> 
> 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%+).

ps and top utilities computes cpu utilization quite differently. when
top shows 100% for opera, in the exactly the same time ps shows about
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.
> 


-- 
Witold Baryluk

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