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Echoes of Classic (Mar 20 2007)
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Author | Message |
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Matt Lebofsky Send message Joined: 1 Mar 99 Posts: 1444 Credit: 957,058 RAC: 0 |
Regular backup outage today. Everything was normal except we bounced the replica database to change one buffer size setting and now nobody can connect to it - even to shut it down! Seems like we lost all our connection permission info somehow. From what we can tell it is still acting as a replica and making updates, but we can't access the data at all. We're stumped. Bob's looking into it. On the plus side, we got all the pieces in place to move another function off kryten and onto bruno: file deletion. I just fired this off, and at first glance it seems faster. Time will tell if this is an improvement. Bruno is a faster machine in general, but kryten had a gigabit connection to the workunit file server, while due to lab infrastructure bruno can currently only have 100 Mbit. So we shall see. Hopefully queues will drain after we recover from the outage backlog. Here's a fun one: Since the switchover to using Hurricane Electric as our main ISP I noticed lingering traffic on the campus router which served our Cogent link. We're talking as much as 1 Mbit/sec. Today while updating lab-wide DNS records I noticed shserver2 was still there. This was the DNS alias for our SETI@home classic data server. I removed this entry, and check out the dip in traffic: So, well over a year since unplugging the classic data server, there are still enough SETI@home classic clients around the world trying to access a missing server to account for almost 1 Mbit/sec of traffic on UC Berkeley campus routers. Not sure how to exactly explain the shape of this graph (and why incoming = outgoing). The diurnal shape and hourly ridges look like scripts or cronjobs running on machines that haven't been checked in ages. A lot of BOINC naysayers like to point out how many classic users "quit" last year after the big transition. But this graph adds some meat to my theory that a large chunk of the SETI@home classic users actually left the project many ages ago, and their old clients simply continued to run unattended. Mind you, this is 1 MBit/sec of traffic without actual workunit data being sent - just SYNs, basically. I think. Somebody break out a calculator and determine how many SETI@home classic clients this represents. - 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 |
1mp0£173 Send message Joined: 3 Apr 99 Posts: 8423 Credit: 356,897 RAC: 0 |
Matt, There is a flaw in most resolvers dealing with hosts that don't exist: if a server says "I don't know shserver2" (rcode=3) the resolver will ask another one of your DNS servers. It'll reduce DNS load if you put something in your zone for shserver2, I'd put 127.0.0.1. -- Ned |
Dr. C.E.T.I. Send message Joined: 29 Feb 00 Posts: 16019 Credit: 794,685 RAC: 0 |
. . . Nice work there Matt / Berkeley yo 4 bruno ;) Somebody break out a calculator and determine how many SETI@home classic clients this represents . . . callin' Esme' ;) |
zoom3+1=4 Send message Joined: 30 Nov 03 Posts: 65737 Credit: 55,293,173 RAC: 49 |
So that is what was using the little bit of bandwisth, Classic just won't die. Interesting though. Facinating. The T1 Trust, PRR T1 Class 4-4-4-4 #5550, 1 of America's First HST's |
mikey Send message Joined: 17 Dec 99 Posts: 4215 Credit: 3,474,603 RAC: 0 |
Here's a fun one: Since the switchover to using Hurricane Electric as our main ISP I noticed lingering traffic on the campus router which served our Cogent link. We're talking as much as 1 Mbit/sec. Today while updating lab-wide DNS records I noticed shserver2 was still there. This was the DNS alias for our SETI@home classic data server. I removed this entry, and check out the dip in traffic: Don't have a clue if it is relevant but waaaay back when, when you were having server issues ALOT of us put in actual server addresses in the "http proxy" section of Boinc. It worked until you caught on, seems we were using a connection line that cost you a fortune instead of a cheap one. I wonder if some hosts are still using that "technique". |
Odysseus Send message Joined: 26 Jul 99 Posts: 1808 Credit: 6,701,347 RAC: 6 |
So that is what was using the little bit of bandwisth, Classic just won't die. Interesting though. Facinating. There’s still the occasional posting in the Q&A boards from people asking why their S@h v3.x doesn’t seem to be making any progress … |
Misfit Send message Joined: 21 Jun 01 Posts: 21804 Credit: 2,815,091 RAC: 0 |
It worked until you caught on, seems we were using a connection line that cost you a fortune instead of a cheap one. Another reason for the lot of you to make a donation. Payback. me@rescam.org |
mikey Send message Joined: 17 Dec 99 Posts: 4215 Credit: 3,474,603 RAC: 0 |
It worked until you caught on, seems we were using a connection line that cost you a fortune instead of a cheap one. Did so a month ago, sent a $100.00 donation thru the new paypal way. |
KWSN THE Holy Hand Grenade! Send message Joined: 20 Dec 05 Posts: 3187 Credit: 57,163,290 RAC: 0 |
[snip] Matt, now that Bruno is actually showing up on the "server" page, the "hosts" section of that page should be updated to include it, don't ya think? . Hello, from Albany, CA!... |
Matt Lebofsky Send message Joined: 1 Mar 99 Posts: 1444 Credit: 957,058 RAC: 0 |
Matt, now that Bruno is actually showing up on the "server" page, the "hosts" section of that page should be updated to include it, don't ya think? Yes I do, which is why I did included it before I even started this thread. Fourth one down in the list. The list is in no specific order. - 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 |
Michael Roberts Send message Joined: 20 Aug 99 Posts: 2588 Credit: 791,775 RAC: 0 |
Somebody break out a calculator and determine how many SETI@home classic clients this represents Here's my response from the Café - can anyone improve the estimated input values or suggest a better model? Well I'll start the ball rolling. There are two issues here - first a suitable model of the traffic origins and second, sensible input numbers. |
Es99 Send message Joined: 23 Aug 05 Posts: 10874 Credit: 350,402 RAC: 0 |
What am I? The secretary? :p Reality Internet Personality |
Dr. C.E.T.I. Send message Joined: 29 Feb 00 Posts: 16019 Credit: 794,685 RAC: 0 |
Secretary? NOPE - 'NOT' what i was thinkin' - i refer to Matt's Request which i have hope / belief - in the Positive Sense of the Word - that you may be able to assist with some 'Math' related (see Matt's Post) . . . Michael Roberts has started the 'ball rollin' per se . . . see IF it's something YOU could help out on . . . that's all (after all - YOU are GOOD with Math aren't you?) mi thinks so ;) With Sincerity, richard |
1mp0£173 Send message Joined: 3 Apr 99 Posts: 8423 Credit: 356,897 RAC: 0 |
I was thinking "Executive Assistant".... <ducking> |
Clyde C. Phillips, III Send message Joined: 2 Aug 00 Posts: 1851 Credit: 5,955,047 RAC: 0 |
What's the significance of "Esme"? I see the green graph. Maybe somebody in this thread likes a Hispanic girl named "Esmeralda", which is Spanish for "emerald". Back in 1998 I saw parts of a Mexican soap opera "telenovela" on the TV channel "Univisión" with that title, starring Fernando Colunga y Leticia Calderón. |
Dr. C.E.T.I. Send message Joined: 29 Feb 00 Posts: 16019 Credit: 794,685 RAC: 0 |
What's the significance of "Esme"? I see the green graph. Maybe somebody in this thread likes a Hispanic girl named "Esmeralda", which is Spanish for "emerald". Back in 1998 I saw parts of a Mexican soap opera "telenovela" on the TV channel "Univisión" with that title, starring Fernando Colunga y Leticia Calderón. Clyde - it's Es99 - 'er name is Esme' (i believe i 'ave the spellin' correct?) |
John McLeod VII Send message Joined: 15 Jul 99 Posts: 24806 Credit: 790,712 RAC: 0 |
Somebody break out a calculator and determine how many SETI@home classic clients this represents OK, call it 5 million connections. That does not equate to 5 million hosts. Assume that each host contacts the server 10 times per hour and you get around 25000 hosts instead. The 10 contacts per hour was a left handed extraction. BOINC WIKI |
1mp0£173 Send message Joined: 3 Apr 99 Posts: 8423 Credit: 356,897 RAC: 0 |
Somebody break out a calculator and determine how many SETI@home classic clients this represents If there is a host at the IP, listening on the right port, you'd have six packets minimum per connection. If nothing is listening, you'd have several "syn" packets per host that would go unanswered. I'd have to read a couple of RFCs to figure out the likely number. |
Uioped1 Send message Joined: 17 Sep 03 Posts: 50 Credit: 1,179,926 RAC: 0 |
Well, here's some anecdotal evidence: I probably have somewhere between 50 and 100 hosts still trying to get some classic workunits. Those were from previous jobs, where I had SAH running as a windows service in the standard workstation build. I had permission to install those clients, but I was the helpdesk and I didn't want to receive complaints from users about their processor utilization, so I hid the process. It wouldn't suprise me if whoever is running IT at those places doesn't know or doesn't care about it. Those workstations will likely keep attempting to pull work until they're finally retired or rebuilt. |
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