Emily (Apr 06 2009)

Message boards : Technical News : Emily (Apr 06 2009)

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Profile Matt Lebofsky
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Message 882902 - Posted: 6 Apr 2009, 22:32:20 UTC

Much progress over the weekend on the science database front. The pulse table has successfully been rebuilt, we started up the assimilators, and the queue drained to zero. With the influx of resources the splitters revved up and more workunits went out. All was well until the logical log on thumper filled up. This is a log of transactions which is necessary for database replication, and given all the pulse table activity it's no surprise it did get clogged up with extra transactions. When the log fills, the database engines have no choice but to hold still until there's log space again. Jeff noticed the dip in the traffic graph and got that all sorted out.

Just now there was another dip in the traffic caused by some DOS'ing on our web site causing some mysql database overload. Damn robots skimming stats off our sites... I made a quick route rule to block the offending IP. This damaging effect was probably unintentional but still very annoying.

- Matt

-- BOINC/SETI@home network/web/science/development person
-- "Any idiot can have a good idea. What is hard is to do it." - Jeanne-Claude
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Profile Allie in Vancouver
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Message 882937 - Posted: 7 Apr 2009, 0:26:10 UTC

It's not so bad: I was able to grab a cache of WU's within minutes of allowing new tasks, so I'm a happy girl.

As always, thanks for keeping us peon's updated.
Pure mathematics is, in its way, the poetry of logical ideas.

Albert Einstein
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Message 883047 - Posted: 7 Apr 2009, 12:50:22 UTC

First of all, thanks for the tech news! I daily keep a track on how You're doin' aswell as the servers.

I also have a question:
Is it possible to define different computing settings for multible computers?
I have 2 quad core computers which I only want one to use all 4 cores and the other 3. How does this work?


All You have to decide is what to do with the time that is given to You.
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Profile Johnney Guinness
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Message 883049 - Posted: 7 Apr 2009, 13:21:46 UTC
Last modified: 7 Apr 2009, 13:22:43 UTC

Matt's April Tech News theme names; Hurricane's!

*****************
2007 - Olga
2005 - Emily
2004 - Alex (Alexei)
*****************

Am i correct?

John.
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OzzFan
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Message 883135 - Posted: 7 Apr 2009, 21:14:53 UTC - in response to Message 883047.  

First of all, thanks for the tech news! I daily keep a track on how You're doin' aswell as the servers.

I also have a question:
Is it possible to define different computing settings for multible computers?
I have 2 quad core computers which I only want one to use all 4 cores and the other 3. How does this work?


The best place to ask questions about individual users is over in the Q&A forum.


To answer your question, yes, you can set up different venues or "locales" with different preferences for each venue. Then you simply put each Host ID (computer) into the appropriate venue and it will obey those preferences.
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Message 883164 - Posted: 7 Apr 2009, 22:49:03 UTC - in response to Message 882902.  

Man, I hate it when my DB log space fills up! In theory, if the DB replica was faster, then you wouldn't need as much log space. In practice, I've just had to find more drive space for the logs. :(

I've heard that some firewall/routers (expensive ones) have automatic DoS detection and will temporarily ban an IP address that does too many scans. I wish I had some more information about it, but this is a common problem for most I.T. shops.
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Message 884142 - Posted: 11 Apr 2009, 1:38:29 UTC - in response to Message 883164.  

Watchguard Firewalls will automatically ban IP's of DoS attacks.
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Message boards : Technical News : Emily (Apr 06 2009)


 
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