Posts by Link


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1) Message boards : Number crunching : Correct delete of HDD before new OS install? (Message 1505097)
Posted 22 hours ago by Profile Link
If the data is that sensitive smash the HDD with a hammer several times and cast them into the sea. This works on all types of drives BTW.

Sensitive data should only be stored on encrypted drives or inside encrypted file containers like those offered by TrueCrypt.

For working with sensitive data the entire drive including the system partition should be encrypted anyway as many programs might write parts of the sensitive files for example into your temp directory.
2) Message boards : Number crunching : Overheating on laptops (Message 1504491)
Posted 2 days ago by Profile Link
I don't think it's a good idea to run SETI on a laptop. Who knows how much you're lowering its life expectancy and it's not like you can open it up and replace a part.

Don't know... my laptop is now over 8 years old, it run 38,000+ hours so far according to the information I get from the HDD, not all of it with BOINC, but most. No problems here, ~55°C on the CPU now, up to 63°C when it's really hot in summer. OK, I modified the cooling a bit and undervolted the CPU, so it's running about 25-30°C cooler that it would without this modifications...
3) Message boards : Number crunching : Correct delete of HDD before new OS install? (Message 1504489)
Posted 2 days ago by Profile Link
msattler wrote:
It's been a while, but if you boot directly from the install CD, does it not also give you the option of deleting the partitions from the target HD?

Yes, it does and that's pretty much all I use. Delete all old partitions, create new ones and quick format them or just quick format the system partition if I want to keep the data on the other ones (which is the more common case).

Except for cases like that:
jason_gee wrote:
I've done it before on 'cranky' drives, and works a treat sometimes to bring drives like new, before OS fresh install :).

Here it really might help to completely erase the dirive, either it's OK after that or it was the last time it was in use.

I also always wipe a drive if I retire it just so it is done once I decide to bin it or if someone else wants to have it.
4) Message boards : Number crunching : Overheating on laptops (Message 1503533)
Posted 4 days ago by Profile Link
I noticed that when the application is running, my laptop battery often becomes very hot. This concerns me, because sometimes it is so hot that I can barely touch it. I have revised my computing settings to reduce the percentage of CPU usage during sessions. Will this help? What other methods or preferences can be employed to minimize overheating?

Well, there are many things you can try:
- remove the battery when you don't need it (if possible)
- use less CPU cores, for your i7 with 4 real and 8 virtual cores I'd try 50% first (I would definitely not recommend not using 100% CPU time)
- don't use both GPUs
5) Message boards : Number crunching : WinXP EOS -> it's really unsafe after April 08, 2014? (Message 1500646)
Posted 11 days ago by Profile Link
From what I read in the web, the bad people eagerly await this date, because they know opened doors already for to attack WinXP PCs then.
Is this true?
Or incorrect information in order to sell more Microsoft OS's? ;-)

We will know that in the next few weeks, now nobody can tell you that.



IIRC, my WinXP PC didn't got security updates after I installed WinXP SP3.
So maybe the last 3 years no new security update.
It looks like my PC got never a virus. At least the virus tool found no virus. ;-)
But, I'm already unsafe in the web?

Than if you have not installed any updates since the release of SP3, which was released 2008 BTW, why are you worried, that you won't be able to do it in the future? With just SP3 and no updates after that at all you're probably more unsafe now than you'll ever be with a full patched WinXP.



I have my WinXP PC at a DSL Router. He have a hardware firewall.
Or is there no difference between modem (directly) and router (firewall) connection?

That helps a lot.



If I go at April 09 with my Firefox (latest/newest v28) into the web (still with WinXP), it could be dangerous?
How I could infect my WinXP PC?
If I go to a hacked (or bad) website?

That can always happen, nevermind which Windows and which browser you use, but of course you should always try to use products, which are still getting security updates, so at least you should not use IE8, which won't get updates anymore. Also you will get new updates the 8th (if you actually install them). The first patch day, when WinXP won't get updates is the 13th May and it probably wouldn't have get any updates before that anyway, regardless of EOS.



Or if the WinXP PC is just connected to the internet (my DSL router (PC) is (must be) 24/7 online, because VoIP (web phone))?

As long as the computer is behind a firewall (router), it's not a big issue, more important is the software that actually uses the connection.


That being said, I still use my WinXP laptop, which is not really Win7/8 compatible and I will use it just like nothing happened, but of course I watch it more carefully. The other WinXP machine I have is just a BOINC cruncher, it contacts only project servers (and MS and Avast update servers), so I don't see there any issues at all.
6) Message boards : Number crunching : Letter to Professor Stuart Bale, Director SSL (Message 1498129)
Posted 16 days ago by Profile Link
It gives a bad image of our community and harms us.

It gives an image of community, which is slowly falling apart because of this issue. So if anything, than it is CN that harms the community (and maybe even science if we also consider all those aborted MB WUs) and not this letter.

But Science is more important than credits.
And although I agree that the credits are very important.
I will not leave the project, and my teammates either, for a history of credits...

For you and most of your teammates it may be so, for many others it isn't. It's not only about people leaving, those do no real harm to the project, but it's also about people aborting MB WUs for to crunch more AP. I wonder how many MB WUs has already not been crunched and marked as bad with too many errors because of that. So giving the correct amount of credits might indeed have something to do with the quality of the science we are doing here.
7) Message boards : Number crunching : Letter to Professor Stuart Bale, Director SSL (Message 1498116)
Posted 16 days ago by Profile Link
You should not have addressed for one person who is not directly in charge of the SETI@home project.

People in charge of SETI@home have been addressed often enough, Eric has try few tweeks, David doesn't seem to care and as far as I have read in the forums still thinks that there's nothing wrong with CreditNew.



It gives a bad image of our community and harms us.

It gives an image of community, which is slowly falling apart because of this issue. So if anything, than it is CN that harms the community (and maybe even science if we also consider all those aborted MB WUs) and not this letter.
8) Message boards : Number crunching : all my wingmen's S@H Enhanced tasks end in error, but are validated and credited (Message 1497152)
Posted 19 days ago by Profile Link
See my edit, I thought he posted the computers, that made the errors.
9) Message boards : Number crunching : all my wingmen's S@H Enhanced tasks end in error, but are validated and credited (Message 1497115)
Posted 19 days ago by Profile Link
Sorry Link but it looks like you missed quite a few with the old, "CUFFT error in file 'c: or d:/Projects/SETI/seti_boinc/client/cuda/cudaAcc_fft.cu' in line 62."

Hmm... I just checked all Enhanced results of those 3 computers and could not find this line. Could you please point me one WU, where you see this line in the std_err?

EDIT: I see I should have look at the wingmen of those computers. Ups...
10) Message boards : Number crunching : all my wingmen's S@H Enhanced tasks end in error, but are validated and credited (Message 1497101)
Posted 19 days ago by Profile Link
I just noticed that all of the Enhanced tasks tasks I am crunching seem to take quite a while to complete relative to credit granted while ALL of my wingmen's enhanced tasks end in error after 10-20 seconds, but are validated and credited. Check the SETI@home Enhanced tasks on these rigs:

here,
here,
and here.

Did I miss something?

I don't see on any of those computers S@H Enhanced tasks, which run just 10-20 seconds. All I checked seem to have finished cleanly and got the normal* amount of credit. The only thing that's wrong with them, is that they should have been purged from database long time ago, but that's another issue.

*: normal for CreditNew
11) Message boards : Number crunching : WinXP EOS -> Motherboard is Win8.1 compatible? (Message 1494059)
Posted 25 days ago by Profile Link
The drivers for the G41 chipset are built into Windows 8.1.


That's been my experience with those older Intel chipsets. Win 8 just runs on them out of the box.

And if something does not, try to get drivers for it from Windows Update, there you get even more drivers than what's on the DVD.
12) Message boards : Number crunching : Adding ssd to speed up projects (Message 1491763)
Posted 28 days ago by Profile Link
Well I'd rather have my backed-up spinning data drive fail than my SSD OS boot drive and have to go through hours and hours of reinstall and config.

You can backup the OS drive too, than if it fails you'll just have to install what you installed after the backup.
13) Message boards : Number crunching : Adding ssd to speed up projects (Message 1491397)
Posted 29 days ago by Profile Link
keep in mind that all things fail.

Yes. But I often had the impression, that once SSDs came out, many people forgot, that HDDs may fail too (that were pretty much the same people, who always complained about the short lifespan of HDDs before the SSDs came out).
14) Message boards : Number crunching : Adding ssd to speed up projects (Message 1491311)
Posted 29 days ago by Profile Link
What is the best use of the SSD?

Install the operating system and programs on it to speed up the system and also use it for any I/O intensive stuff (like video editing for example).

As for BOINC usage, it won't help much, specially not for SETI as it is not I/O intensive. It might help a bit in case of projects like Rosetta, which unpacks lots of files from a zip file each time it starts a new WU, but that's also just 2-3 seconds and than the WU runs for several hours without any noteworthy HDD load. I don't know wether there are any really I/O intensive BOINC projects, such projects might indeed benefit from a SSD. But in generall, as long as you don't see the HDD LED being on for longer periods of time when using HDD, you won't see any speed up for BOINC.

If you are worried about shortening the lifespan of the SSD, you can increase the checkpoint interval a bit. OTOH, tests have shown, that SSDs are not so sensitive to writes as many people think.
15) Message boards : Number crunching : CPU tasks run slow after upgrade to 7.2.42 (Message 1491138)
Posted 29 days ago by Profile Link
On the third, however, after restart the CPU tasks now seem to get less than 2% CPU usage, and have thus been crunching for days to get only 1-2% complete.

Besides what has been said already... what's using the other 98%? The usage as seen on the posted sceenshot adds up to something around 65%, so unless the CPU is partly idle, there must be something outside of BOINC using the other ~35%.

But considering that this is a P4 with just a single physical core (2 virtual), you really should limit the CPU usage of BOINC to 50%, i.e. 1 CPU task, or maybe even disable CPU crunching at all considering the 3 GPUs it has to feed, they are for sure not running as fast as they could. Well, the GPUs are not fast too, so maybe you can let one CPU task run, but you should start with no CPU tasks and see how fast the GPUs can be and than see how that changes with one CPU task. But my guess ist that you'll get most out of this machine with no CPU tasks at all, because you are running AP on the GPUs.
16) Message boards : Number crunching : 32 or 64 (Message 1490797)
Posted 30 days ago by Profile Link
I would doing normal things, no movie or storing large data bases. But, want to crunch Boinc Projects as fast as I can.

Than you should check the RAM requirements of the projects you run and buy as much as they + the system + the applications you run need, so that you don't need to have a pagefile turned on.

For example a good rule of a thumb from Rosetta, which is quite RAM hungry, is 1GB per core + 2-4GB for everything else, depending if it's dedicated cruncher or not.
17) Message boards : Number crunching : Kein Vorwärtkommen!!! (Message 1487884)
Posted 36 days ago by Profile Link
Es erschloss sich mir nicht, warum ich 20 Tage lang -jeden Tag- ca. 1000 Punkte (RAC) bekam und seit dem 05.03.2014 nur 47 Punkte!!! (gerade aus Boinc abgelesen)

Auch wenn eure Antworten im Grundsatz stimmen - sind mir die 47 Punkte echt zu wenig....

Dann hast du immer noch nicht verstanden was RAC ist und dass dieser nicht ewig weiter steigen wird sondern nach ca. 4 Wochen nur noch um einen bestimmten Wert, der eben deinem Tagesdurchschnitt entspricht, pedeln wird.

Seit meinem letzten Post in diesem Thread vor ca. 20 Stunden hast du 16591 Credits bekommen und keine 47 oder so. Da ist ein RAC von ca. 20000 ziemlich richig und wird nicht weiter nennenswert steigen.
18) Message boards : Number crunching : Worth running two WUs simultaneously on mainstream Kepler cards ? (Message 1487852)
Posted 36 days ago by Profile Link
I do not have dedicated crunching rigs so it is very hard for me to establish a baseline running a single WU at a time and then change up to two and see which way the RAC goes.

You can calculate the RAC for each configuration yourself from the runtime and awarded credits, that way you'll get pretty good value after something between 50-100 WUs. That's way faster than waiting 4-6 weeks and also the value you get won't be affected by things like waiting for wingman or other things you do with your computer, only the actuall performance will matter. Just make sure to only consider WUs which were crunched when the computer wasn't doing anything else.
19) Message boards : Number crunching : Kein Vorwärtkommen!!! (Message 1487501)
Posted 37 days ago by Profile Link
Versuchen wir das kurz und einfach zu fassen...

Das es für verschiedene Aufgaben unterschiedliche Punkte gibt kann ich ja noch gut nachvollziehen!

Aber warum hängt mein RAC seit dem 5.3. auf ca. 21,000 fest?

Weil das vermutlich ungefähr das ist, was deine Computer am Tag schaffen. RAC ist der Tagesdurchschnitt, der steigt nicht ins Unendliche, sondern pendelt sich um den Wert ein, den deine Computer am Tag schaffen.



Warum werden Punkte abgezogen, wenn ich doch für fast 600 Task die Punkte noch zu bekommen habe???

Das passiert immer wenn überdurchschnittlich viele WUs auf den "Wingman" warten müssen oder (vor allem Aufgrund von Designschwächen des Credit-Systems) du "schlechter bezahlte" WUs bekommen hast. Dann werden pro Zeiteinheit weniger Credits gutgeschrieben und entsprechend sinkt dein Tagesdurchschnitt (RAC).

Du musst zwischen deinem Gesamtguthaben (Credit) und dem aktuellen Tagesdurchschnitt (RAC) unterscheiden. Erstes, aktuell bei 719856 Credits, geht immer weiter hoch, da wird dir auch nie was abgezogen, letzteres wird immer schwanken und ist lediglich eine ungefähre Angabe deiner aktuellen Performance, eine, die so ungenau ist, dass man IMHO am besten gar nicht drauf achten sollte.
20) Message boards : Number crunching : Crashed Host (Message 1483673)
Posted 46 days ago by Profile Link
Ask because it remains 170 WU in their cache and this WU will never been crunched simply because the hosts did not exist anymore.

They will be crunched once they time out and the server sends them to another machine. Not worth spending a single thought on that IMHO, there are many things BOINC does less than optimal, but such simple things like tasks on a dead machine it can handle perfectly.


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