[gentoo-user] Emerge -puv really slow?

[gentoo-user] Emerge -puv really slow?

[Paul Sobey]

For the last couple of weeks I've noticed that emerge -puv world takes 
an absolute age on my machine (currently at 5 mins and counting), while 
the cpu gows to 100%. The little emerge rotator bar that spins while it 
calculates dependencies moves extremely slowly. Is there any known bug 
that causes this? How can I go about troubleshooting?

Cheers,
Paul
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Re: [gentoo-user] Emerge -puv really slow?

[Daniel Pielmeier]

Paul Sobey schrieb:
> For the last couple of weeks I've noticed that emerge -puv world takes 
> an absolute age on my machine (currently at 5 mins and counting), while 
> the cpu gows to 100%. The little emerge rotator bar that spins while it 
> calculates dependencies moves extremely slowly. Is there any known bug 
> that causes this? How can I go about troubleshooting?
> 
> Cheers,
> Paul


My guess is you have removed the portage-cache before using emerge. 
Normally this happens when a previous emerge --sync fails because of an 
error or there are identical timestamps on the server and the local machine.

When this happens you have no portage-cache because portage deletes the 
cache first when syncing. If the timestamps are identical the cache is 
not regenerated. If there is an error while syncing the cache is missing 
too, because the regeneration of the cache is done in the end of the sync.

So the cache is regenerated when doing the first emerge and this takes 
quite a while. Even on a Core2Duo 6600@2.40GHz i takes more then three 
minutes :-).

In case of the timestamp issue i think it is a bug [1]. I think portage 
should first check the timestamps and if they are different it should 
delete the cache!

[1] http://bugs.gentoo.org/show_bug.cgi?id=202535

Regards,

Daniel
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Re: [gentoo-user] Emerge -puv really slow?

[Paul Sobey]

Daniel Pielmeier wrote:
> Paul Sobey schrieb:
>> For the last couple of weeks I've noticed that emerge -puv world takes 
>> an absolute age on my machine (currently at 5 mins and counting), 
>> while the cpu gows to 100%. The little emerge rotator bar that spins 
>> while it calculates dependencies moves extremely slowly. Is there any 
>> known bug that causes this? How can I go about troubleshooting?
>>
>> Cheers,
>> Paul
> 
> 
> My guess is you have removed the portage-cache before using emerge. 
> Normally this happens when a previous emerge --sync fails because of an 
> error or there are identical timestamps on the server and the local 
> machine.
> 
> When this happens you have no portage-cache because portage deletes the 
> cache first when syncing. If the timestamps are identical the cache is 
> not regenerated. If there is an error while syncing the cache is missing 
> too, because the regeneration of the cache is done in the end of the sync.
> 
> So the cache is regenerated when doing the first emerge and this takes 
> quite a while. Even on a Core2Duo 6600@2.40GHz i takes more then three 
> minutes :-).
> 
> In case of the timestamp issue i think it is a bug [1]. I think portage 
> should first check the timestamps and if they are different it should 
> delete the cache!

Interesting idea - I've been running eix-sync in my crontab. Perhaps 
that hasn't been updating the edb cache. I've changed it eix-sync -r, 
perhaps that will fix things.

Paul

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Re: [gentoo-user] Emerge -puv really slow?

[Paul Sobey]

> Daniel Pielmeier wrote:
>> In case of the timestamp issue i think it is a bug [1]. I think portage
>> should first check the timestamps and if they are different it should
>> delete the cache!
>
> Interesting idea - I've been running eix-sync in my crontab. Perhaps
> that hasn't been updating the edb cache. I've changed it eix-sync -r,
> perhaps that will fix things.

Follow up - you were spot on. I have my server --sync every Friday
evening, and my desktop was syncing against that on a daily basis. Thanks
for your help, that was driving me nuts.

Paul


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Re: [gentoo-user] Emerge -puv really slow?[OT]

[Anthony Metcalf]

Paul Sobey wrote:
>
> I have my server --sync every Friday
> evening, and my desktop was syncing against that on a daily basis. Thanks
> for your help, that was driving me nuts.
>
> Paul
>
>
>   
Out of interest, why? If the server only syncs once per week, you *know* 
that nothing will change as far as the client (i.e. desktop) is 
concerned 6 out of 7 of the times it syncs? Seems a waste?

Anthony

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Re: [gentoo-user] Emerge -puv really slow?[OT]

[Paul Sobey]

> Out of interest, why? If the server only syncs once per week, you *know*
> that nothing will change as far as the client (i.e. desktop) is
> concerned 6 out of 7 of the times it syncs? Seems a waste?

No reason at all - just set one up a few weeks after the first and didn't
think. And of course it wasn't an issue until recently - that cache
clearing behaviour of portage seems to have changed - so have only just
noticed :)

Paul


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