Posts by ivan


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1) Message boards : Number crunching : Windows 10 - Yea or Nay? (Message 1706242)
Posted 2 days ago by Profile ivan
If 10 is the F'up I suspect, I may abandon Windows totally, and go for some Linux version.


I hear Linux Mint is nice.

Works OK for me. Put it on my XP machine at home when it lost its HDD; the AthlonX2 that handled 32-bit XP OK wasn't up to 64-bit Linux, so I swapped in an i7 motherboard & CPU. I think part of the problem getting used to it was the Cinnamon display manager, it's a bit top-heavy. I put Mint on an old Atom netbook, using Mate rather than Cinnamon and that seems to work well, though I haven't tried to do much with it.
2) Message boards : Number crunching : Panic Mode On (99) Server Problems? (Message 1706064)
Posted 2 days ago by Profile ivan
/me runs away, before someone finds the Straight Jacket.

Just a word of advice from a pedant -- it's a straitjacket, from the word strait meaning a hindrance, a hardship, a narrow part or passage; as in dire straits, or Bass Strait, Magellan Strait or Bering Strait, or strait-laced. :-)
3) Message boards : News : Big boost for SETI@home from Yuri Milner's Breakthrough Listen Initiative (Message 1703567)
Posted 10 days ago by Profile ivan
Wonderful news!!!!!

And all of you who have been crunching for 16 years were REALLY trend-setters!!!

I hope that doesn't make us hipsters then. 0.o

http://www.telegraph.co.uk/news/uknews/11749475/Thankfully-no-hipsters-were-injured-London-Fire-Brigade-apologises-for-Shoreditch-tweet.html
4) Message boards : Number crunching : GPU Curiosity Question (Message 1702634)
Posted 13 days ago by Profile ivan
I have a dedicated Nvidia 750 TI (no monitor attached) running one task and the temperature of the GPU is 50C. According to the SETI Task Page a typical AP Run Time of 2100 seconds results in a CPU (GPU) Time of around 80 seconds. There is one virtual CPU core free to support the GPU and "top" always shows the load on it at less than 15%. The question is, why would the GPU only show that it is working less than 5% of the time?

I have compared the server times using “ps ax” and the server logs to the times reported by the task page and they seem to agree. I suspect it is what it is, but it would be nice to know why it is. Perhaps the Linux algorithm for reporting the CPU time is flawed, but you would think the GPU temperature would be higher if that were the case. The reported temperature of 50C would certainly indicate that the GPU is not being overtaxed

Perhaps you are confusing GPU with CPU -- "top" knows nothing about GPUs, only CPUs. In fact, I know nothing that will give you an estimate of GPU usage under Linux -- nvidia_smi will tell you the GPU temperature, the percentage of the fan speed and memory usage. But it won't tell you the things that GPUz (purports to) tell(s) you about the GPU on Windows systems.
50 C is a doddle for a 750 Ti -- it will easily run two instances, where the one or the other takes over computing in the "slack" periods that the other job is transferring data to the host PC. Set it to run two instances and watch your RAC climb a bit -- and your GPU run 10 or so (Celsius) degrees warmer. (I've got a 660 Ti in this Linux machine, it's showing 63 C running two Astropulse WUs with an ambient of about 25 C; I also have a 750 Ti in a Windows machine at work, it handles two SETI jobs with ease, though I do notice a bit of mouse lag when one of its jobs is an Astropulse WU).
5) Message boards : Number crunching : Show and tell your machine. Here's mine. (Message 1702299)
Posted 14 days ago by Profile ivan
Loving that Outlander machine. How well does your Titan run Seti tasks? I was looking into used Titans, and Titan Blacks for the double precision for other projects.


Originally I had 2, but burned one out and was getting a RAC of about 55k. Now with the Titan and 2 750ti I'm getting a RAC of about 46k

They're definitely worth it, but a 780ti works better I believe and would be cheaper than even a second hand Titan.

And then when you really get down to it a 980ti spanks the both of them, so...

Having said that, if you can get a Titan for a good price (I got mine effectively for free) then they're certainly built for it!

Hmm, we've got two 980Tis on order for my cow-orker's N-body simulations. I'd hoped to snaffle his S2070 for one of my 20-core Xeons, but he has other ideas...
6) Message boards : Number crunching : Not that it matters one tiny little bit, but... (Message 1702075)
Posted 15 days ago by Profile ivan
In terms of Credit I am 99th. In terms of RAC I'm 34th. I only run 6 machines, and 2 of those are helping others.
Well done to you though, but you do have 37 machines :-)))

Just had a look at where I am in RAC. According to BOINCStats I'm second in the UK (and 34th worldwide, how meta!)

At least LHC is up and running again, so my friends at IC high energy physics have moved their farm back to CMS simulation and analysis now. A few months ago their RAC was over a million!
7) Message boards : Number crunching : Not that it matters one tiny little bit, but... (Message 1701646)
Posted 16 days ago by Profile ivan
...I JUST BROKE INTO THE TOP 20 SETI@HOME CRUNCHERS IN THE UK.
(well, for some reason it matters to me)

Helped by the kind loan of 2 more Mac Pros, They may be older but they're cores for the cause.

Cores for the cause. You heard it here first folks! (if it's original, which I doubt, greatly)

Ivan, I'm coming your way :)

Yeah, you gots a couple of ciphers that you'll quickly dispatch, and then Richard next month. Gets a bit harder after that...
Anyway, congrats. I guess there has to be something that Macs are good for!
8) Message boards : Number crunching : Cant merge hosts. But they're the SAME host... (Message 1700772)
Posted 19 days ago by Profile ivan
So yesterday I had to rebuild Pluto as I managed to break something (un BOINC-related). I thought the backend would either - as in the past when I've had to do this - pick up that it was the same machine or allow me to merge the two instances of the host.

Not today.

What I'm being told is:

Processing pluto.local Can't merge host 7423311 into 7587350 - they're incompatible


Incompatible? They're literally the same computer with the same version of the OS...

The LAN IP address may have changed due to DHCP but that's about it.

Thoughts?

Are you sure you're picking the right machines (you gots so many to choose from! :-)? Neither accounts were created yesterday: 7587350 is dated 29 May 2015, 7423311 stems from 2 Nov 2014. AFAICT none of your machines were inaugurated yesterday, so it must have already picked up an earlier incarnation (like my SNAFU with rm -rf * the other day).
9) Message boards : Number crunching : Bad News on BOINC funding (Message 1699110)
Posted 24 days ago by Profile ivan
Hmm, I wonder if all this is behind the lethargy that's overtaken CMS@Home-dev lately? I'm starting to seriously reconsider my position as its public face.
Interesting times, I'd always felt bending our workflows to fit with the BOINC model was a bit Procrustean, be interesting to see if this prompts a re-think.
10) Message boards : Number crunching : Two Trillion events reached by the Test4Theory BOINC-CernVM project !!! (Message 1697901)
Posted 28 days ago by Profile ivan
Ivan you should have posted this one mate in the sience section , CERN wahoooo go CERN

Yeah, maybe, tho' I was looking for a response from the crunchers. :-)
Just had a two-day meeting of the UK institutes in our experiment; heard a number of interesting items I wasn't aware of before. This could be an interesting year for LHC!
11) Message boards : Number crunching : 'rm -rf *' considered harmful (Message 1697896)
Posted 28 days ago by Profile ivan
It's fine. There is no rush. It leaves a bit of work for the rest of us. :)
Cheers, mate, shall I leave it until Monday then?
12) Message boards : Number crunching : 'rm -rf *' considered harmful (Message 1697871)
Posted 28 days ago by Profile ivan
I can't actually crunch on the machine at present, the server-room A/C failed yesterday so I shut down all S@H jobs so we can do our "work" work without reaching harmful temperatures.

I met a service tech in the lift on my way out tonight -- he'd just replaced the faulty thermistor in the A/C unit, so I'll see if I can start bringing up background S@H jobs on all the servers again tomorrow (I have been running just on one that's designated as my "personal" development machine), without overloading the system. My RAC is starting to take a beating...
13) Message boards : Number crunching : Suddenly BOINC Decides to Abandon 71 APs...WTH? (Message 1697126)
Posted 30 Jun 2015 by Profile ivan
Note Ivan's tale of woe in 'rm -rf *' considered harmful, especially the [edit] to the opening post.

In that case, deleting all (or a substantial proportion) of the files was equivalent to a true 'detach', so the action taken was appropriate and indeed desirable. We need to be sure we keep the handler for that situation.

I'm glad someone found some good in the situation. :-) Me, I'm off-campus for two days, will revisit the problems on Friday.
14) Message boards : Number crunching : 'rm -rf *' considered harmful (Message 1697118)
Posted 30 Jun 2015 by Profile ivan
How blue was the sky today, at 30.4 C outside (and just a few tenths less in my office...)?
15) Message boards : Number crunching : 'rm -rf *' considered harmful (Message 1697107)
Posted 30 Jun 2015 by Profile ivan
Apologies to wingmen on my older Xeon/CUDA server. In a fit of heat- or svn-frustration-induced fever today I typed the fateful command 'rm -rf *' thinking that I was connected to another computer in another window in another workspace and not in my $HOME directory. :-( By the time I realised that the command was taking longer than it should, and hit Ctrl-C, I'd lost all files (alphabetically) down to boinc* -- which included BOINC, so all my WUs are lost.

Sorry.

boinc_repository was still intact, so I've rebuilt the boinc executables, and the CUDA executable is still in its build directory; so I just need to recreate the app scripts. Now we're up again after maintenance I'll try to reattach, merge with the old instance, and abort/reset so the WUs can go to new homes. I can't actually crunch on the machine at present, the server-room A/C failed yesterday so I shut down all S@H jobs so we can do our "work" work without reaching harmful temperatures.

[Edit] Ah, it looks like the server automagically merged the new instance and abandoned all the pending tasks. Now to wait for the A/C to be repaired before starting again. [/Edit]
16) Message boards : Number crunching : The kittyman has fixed the rig, work on the way, wingys! (Message 1696475)
Posted 28 Jun 2015 by Profile ivan
Dunno.

As long as you're back on the air, that's what matters. I must find the (round) tuits to look at one of my home servers that died last month. It's a bit old in the tooth (Core2Quad) and worth less than 2,000 RAC but it is my disk server (tho' I do have a NAS as backup to it).
17) Message boards : Number crunching : Two Trillion events reached by the Test4Theory BOINC-CernVM project !!! (Message 1696432)
Posted 28 Jun 2015 by Profile ivan
Just received this message. Congratulations to all involved!

Date: Sun, 28 Jun 2015 06:40:57 +0100 From: Ben Segal <xxx@cern.ch> Subject: Two Trillion events reached by the Test4Theory BOINC-CernVM project !!! Dear all, Today we reached the total of 2 Trillion events simulated since 2011 by Test4Theory volunteers for the CERN PH-TH project MCPlots. We just announced this on the Test4Theory project News forum, and thanked our volunteers, but maybe a wider announcement would be in order? For example, back in September 2013 when we passed the 1 trillion mark, a lot of tweeting was done and CERN published an excellent article about the project: http://home.web.cern.ch/about/updates/2013/09/crowd-sourced-computing-platfo rm-reaches-one-trillion-events . And since then most of the LHC experiments have started BOINC-CernVM projects. Anyway, please feel free to forward this message as appropriate. Best wishes and thanks to all those who have helped to achieve this result, Ben and the Test4Theory team
18) Message boards : Technical News : Mid June Update (Jun 23 2015) (Message 1694900)
Posted 23 Jun 2015 by Profile ivan
Thanks for the info, Matt. Getting some cricket graphs back up would help us armchair quarterbacks second-guessing what's happening at any given instant. :-)
19) Message boards : Number crunching : Furtherst north sight for the telescopes (once in a year - repeatedly) (Message 1693620)
Posted 19 Jun 2015 by Profile ivan
A midsummer's night dream?
Tullio

Night dream right. It's so much light.

Yeah, I spent a day^H^H^Hweek in Trondheim one summer. ...and took a 3-week cruise from Mawson to Melbourne starting about December 7th another year.
20) Message boards : Number crunching : Panic Mode On (98) Server Problems? (Message 1692545)
Posted 17 Jun 2015 by Profile ivan
Strange...
I have a strange feeling of emptiness.

Mmm. Came in this morning to find my wall of gkrellm monitors largely black. Well, the 12-core is down at the moment; I tried finally to put it and the dual-20-core servers into a rack yesterday, but it seems when I rebuilt the rack I put the uprights fractionally closer than the standard rack dimensions, and the 10C's rack rails are about 5mm too long, fully collapsed, to fit.
But one 20C's display is blank, and the other shows only three jobs running.
After a bit of panicking, I eventually realised the fault was in Berkeley, not North Heathrow. Should be a trifle quieter in the server room today.


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