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Re: Bittorrent (Was: RE: [HACKERS] [SUGGESTION] CVSync )

From: "Marc G(dot) Fournier" <scrappy(at)postgresql(dot)org>
To: Magnus Hagander <mha(at)sollentuna(dot)net>
Cc: pgsql-www(at)postgresql(dot)org
Subject: Re: Bittorrent (Was: RE: [HACKERS] [SUGGESTION] CVSync )
Date: 2006-03-27 20:17:05
Message-ID: 20060327161411.T947@ganymede.hub.org (view raw or flat)
Thread:
Lists: pgsql-www
On Mon, 27 Mar 2006, Magnus Hagander wrote:

>>> It's automatically reproduced every 10 minutes. There are two
>>> possibilities:
>>
>> 'k, I'm seeing processes running since 2pm Sunday ... so
>> "every 10 minutes", what exactly is happening?
>>
>> # ps aux | grep btlaunchmany | grep Sun02 | wc -l
>>        36
>
> Yeah. That's a reasonably normal amount of timing.
> What happens is that the script detects a lot of btlaunchmany that are
> suddenly gone. Either they are still there, and not showing up, or they
> are dead. It could well be that they've crashed.
>
> BTW, I've disabled the cronjob now since it sends an email to the slaves
> list every 10 minutes :-) So right now, nothing happens.
>
>
>>> 2) They are no longer reported in a way that Proc::ProcessTable can
>>> read. See the code at
>>>
>> http://gborg.postgresql.org/cgi-bin/cvsweb.cgi/portal/tools/bt/updatet
>>> or rents.pl?rev=1.8;cvsroot=pgweb for what we're trying to do. It is
>>> *possible* this is done because the processes are swapped
>> out, though
>>> I
>>> *think* I tested the code and it handled that.
>>
>> 'k, first ... "processes are swapped out" ... unless
>> something really odd is happening, I've never heard of a
>> process swapped out that is removed from the process table
>> ... at least not under FreeBSD ...
>
> Nope, that would be really weird. But it could well be a bug in the perl
> library Proc::ProcessTable as well.

Or, it could be not listing 'non-reaped (ie. Zombie)' processes ... but, 
the ps listing doesn't seem to be marking them as Zombie ...

>> If you can be online tomorrow afternoon ... ?  that way, when
>> I bring it back up, you are able to look over it for any issues ...
>
> Afternoon your time or mine ;-)

I *think* we are 4 hours off ... always makes it fun to scheduale, I don't 
want to make it too late for you, but not too early for me :)

How about 6pm-ish your time, which I htink is around 2pm mine?

> Oh. Could *that* be where the problem comes from? Ithought the () 
> indicated they were swapped out, I thin kit does on linux :-)

It could be ... only place I've ever noticed this is on a system where the 
child processes weren't being properly killed off though ...

----
Marc G. Fournier           Hub.Org Networking Services (http://www.hub.org)
Email: scrappy(at)hub(dot)org           Yahoo!: yscrappy              ICQ: 7615664

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