Posts by MarkJ

41) Message boards : Number crunching : Raspberry Pi & Other SBC Computers Discussion Thread :) (Message 1989705)
Posted 11 Apr 2019 by MarkJ Crowdfunding Project Donor*Special Project $75 donorSpecial Project $250 donor
Post:
If you are using the Noctua fans they usually have a 3 to 2 pin adapter cable. You can plug the 2 pin directly into the GPIO 5 volt pins on the Pi. See Mod my Pi Case
42) Message boards : Cafe SETI : 20th Anniversary T-shirts - More in stock (Message 1987595)
Posted 28 Mar 2019 by MarkJ Crowdfunding Project Donor*Special Project $75 donorSpecial Project $250 donor
Post:
One black size M please Uli. Shipping to Sydney, Australia.
43) Message boards : Number crunching : Raspberry Pi & Other SBC Computers Discussion Thread :) (Message 1985753)
Posted 18 Mar 2019 by MarkJ Crowdfunding Project Donor*Special Project $75 donorSpecial Project $250 donor
Post:
I am running 4 pi using the bitscope quattro blade, connected to a UPS. Works well for me. I use a universal laptop power supply to power it.

http://www.bitscope.com/product/BB04/

I have a bitscope blade rack. I ran out of Pi’s to put in it.

Most of my existing Pi’s have copper heatsinks and they won’t fit into the bitscope blades so I need to get some more. I’m a bit concerned they’ll overheat once i’ve got the rack fully assembled as there isn’t much room or airflow between the Pi and the blade. I’ve got 8 of them done and they seemed to be thermal throttling as they were slower than my other Pi’s with the active cooling.
44) Message boards : Number crunching : Raspberry Pi & Other SBC Computers Discussion Thread :) (Message 1985459)
Posted 16 Mar 2019 by MarkJ Crowdfunding Project Donor*Special Project $75 donorSpecial Project $250 donor
Post:
Okay I have added 4 of the older Pi3B's to Seti, Lets see how long they take.

Apparently 20 hours. I knew there was a reason why I run Einstein BRP4 work on them normally :-)
45) Message boards : Number crunching : Raspberry Pi & Other SBC Computers Discussion Thread :) (Message 1985283)
Posted 15 Mar 2019 by MarkJ Crowdfunding Project Donor*Special Project $75 donorSpecial Project $250 donor
Post:
So your PI's are not connecting directly to the server? I don't see them on your computer listing.

Tom

They are doing E@H work. They've been off for the last couple of weeks, just getting back into 24/7 mode now.

Okay I have added 4 of the older Pi3B's to Seti, Lets see how long they take.

host 8686616
host 8686617
host 8686618
host 8686619
46) Message boards : Number crunching : Raspberry Pi & Other SBC Computers Discussion Thread :) (Message 1985281)
Posted 15 Mar 2019 by MarkJ Crowdfunding Project Donor*Special Project $75 donorSpecial Project $250 donor
Post:
Its a pity nobody has come up with a suitable power supply for running multiple Rpi demanding 2 - 2.5 amps on each connection.

Jaycar 5V, 14A power supply

Some assembly required there. I meant something ready to go, like a USB charger. You would need to do some wiring and come up with a case for it. On the plus side at 14 amps output it could run 7 Rpi off a single power supply.
47) Message boards : Number crunching : Raspberry Pi & Other SBC Computers Discussion Thread :) (Message 1985264)
Posted 15 Mar 2019 by MarkJ Crowdfunding Project Donor*Special Project $75 donorSpecial Project $250 donor
Post:
So your PI's are not connecting directly to the server? I don't see them on your computer listing.

Tom

They are doing E@H work. They've been off for the last couple of weeks, just getting back into 24/7 mode now.

I fried a USB charger which was powering 4 of them. I thought I might have been pushing it a bit too much running 4 x Pi3B+ when its 30 degrees :-) Its a pity nobody has come up with a suitable power supply for running multiple Rpi demanding 2 - 2.5 amps on each connection.
48) Message boards : Number crunching : Raspberry Pi & Other SBC Computers Discussion Thread :) (Message 1985059)
Posted 14 Mar 2019 by MarkJ Crowdfunding Project Donor*Special Project $75 donorSpecial Project $250 donor
Post:
I must be doing something wrong here. I use RDC to access my Pis. Through it I can do anything on the Pi except deal with BOINC and shutdown or reboot each Pi. I have yet to figure out how to even shut down the BOINC client on each Pi through RDC. If I use the combo and HDMI cable I can shut down or reboot each Pi, but I still cannot use the BOINC Manager to shut down the client. It is not connected to the client. Oh well, perhaps I'll spend more time on them

Siran

To shut down BOINC from a terminal or ssh prompt type “sudo service boinc-client stop”. To start it up again “sudo service boinc-client start”.

To shut the Pi down “sudo shutdown now” or “sudo poweroff”. Note it takes a few seconds to flush to disk/SD card, the green led will blink while it’s doing that. When done it still keeps the red power led on, but at that point you can remove the power.

To reboot the Pi “sudo reboot”.

I don’t put BOINC manager on my Pi’s. I use BOINCtasks on my laptop or ssh into them and use the command line. BT can handle all the BOINC stuff and the ssh session is used for OS updates, etc.
49) Message boards : Number crunching : GTX 1660 thread (Message 1982446)
Posted 27 Feb 2019 by MarkJ Crowdfunding Project Donor*Special Project $75 donorSpecial Project $250 donor
Post:
Got an in-stock notification from EVGA so went to order only to find out they won’t ship to Australia.

The XC and XC Black have shown up in some Australian web sites, but not the XC Ultra that I wanted. Still trying to place an order, even if I have to wait a while for them to arrive. As they say in the adverts “shut up and take my money”
50) Message boards : Number crunching : GTX 1660 thread (Message 1981900)
Posted 23 Feb 2019 by MarkJ Crowdfunding Project Donor*Special Project $75 donorSpecial Project $250 donor
Post:
It seems EVGA will have three versions of the 1660Ti according to their website.

The XC and XC Black have the 3 slot cooler with a single fan. XC Black boosts to 1770 MHz and the XC boosts to 1845 MHz. Both have 6 power phases.

The XC Ultra is longer with a dual slot cooler and dual fans. The XC Ultra boosts to 1860 MHz and has 8 power phases.
51) Message boards : Number crunching : GTX 1660 thread (Message 1981814)
Posted 23 Feb 2019 by MarkJ Crowdfunding Project Donor*Special Project $75 donorSpecial Project $250 donor
Post:
Interesting that it’s got an 8 pin power connector but the GTX 1060 had a 6 pin one. They’re both rated at 120 watts. Judging by the 3 slot cooler EVGA put on theirs I expect they get rather hot, or maybe they overclocked it a bit too much.

There doesn’t seem to be any mention of the non-Ti card, I expect they will come out later.

AMD meanwhile has dropped the price of the Vega 56 to compete, so if you’re in the market for Vega 56 cards now is the time to get them.
52) Message boards : Number crunching : how many pc do you have for boinc projects (Message 1981057)
Posted 18 Feb 2019 by MarkJ Crowdfunding Project Donor*Special Project $75 donorSpecial Project $250 donor
Post:
Six i7-8700 hosts, four Ryzen 7-1700 hosts and twelve Raspberry Pis.
53) Message boards : Number crunching : GTX 1660 thread (Message 1980817)
Posted 17 Feb 2019 by MarkJ Crowdfunding Project Donor*Special Project $75 donorSpecial Project $250 donor
Post:
The rumour mill is indicating there are two, possibly three variants of the Nvidia GTX 1660. These will supposedly be officially announced on the 22nd of February.

The top of the line Ti model has 1536 CUDA cores, 1.5GHz base clock boosting to 1.77GHz and 6Gb of GDDR6 memory with a 192 bit interface. There seem to be some benchmarks floating around for it putting it very close to a 1070.

The second model is the non-Ti variant with 1280 CUDA cores, 1.55GHz base clock boosting to 1.785GHz and 6Gb of GDDR5 memory with a 192 bit interface.

The possible 3rd model is a 3Gb version of the non-Ti but not much is known about it.

The Ti variant has been spotted in retail packaging from EVGA using a 2.75 slot width cooler with a single fan. Palit has one with a 2 slot width cooler also single fan. There was also a Galax branded one. All seem to be short cards.
54) Message boards : Number crunching : Raspberry Pi & Other SBC Computers Discussion Thread :) (Message 1976741)
Posted 24 Jan 2019 by MarkJ Crowdfunding Project Donor*Special Project $75 donorSpecial Project $250 donor
Post:
Several days ago I was told that after several months the MicroSD card will die running on a Raspberry Pi. I started thinking about the possibility of running a Pi from an SSD drive. Lo and behold! :)

Yes that’s one of the reasons they made the Pi Drive

Now, I just need to collect 3 SSDs and 3 SATA to USB 2.0 adapters... :)

You can use any USB drive. The portable SSD’s or hard disks with a USB cable are ideal. The best sort are ones that come with their own power supply as the Pi doesn’t supply much current via the USB. I haven’t tried them but those portable SSD’s should work well.

I have used the Seagate expansion drives (2 and 3TB with a 3.5 inch HDD inside) with some success. I also have two Pi Drives on a couple of Pi’s. One is used as a proxy server and another as a NFS share drive for the other Pis. Some pics of the Pi Driveshere
55) Message boards : Number crunching : Raspberry Pi & Other SBC Computers Discussion Thread :) (Message 1976014)
Posted 20 Jan 2019 by MarkJ Crowdfunding Project Donor*Special Project $75 donorSpecial Project $250 donor
Post:
For remote client connections you will want this in cc_config.
<allow_remote_gui_rpc>1</allow_remote_gui_rpc>

You don’t need this if you’ve set the gui_rpc_auth and remote_hosts values. That’s why your BOINCtasks was able to communicate with the BOINC clients without the password column being filled in. Its a security risk. From the BOINC wiki
If 1, allow GUI RPCs from any remote host (see Controlling BOINC remotely).
56) Message boards : Number crunching : Raspberry Pi & Other SBC Computers Discussion Thread :) (Message 1976012)
Posted 20 Jan 2019 by MarkJ Crowdfunding Project Donor*Special Project $75 donorSpecial Project $250 donor
Post:
You will find increasing the checkpoint interval will improve the lifespan of your SD cards. For my Pi’s I have it set to 600 seconds. You can change it via BOINCtasks. Expect the SD cards to wear out around 6 to 9 months, so it’s good to have an install process to follow and a spare SD card.
57) Message boards : Number crunching : Raspberry Pi & Other SBC Computers Discussion Thread :) (Message 1975924)
Posted 19 Jan 2019 by MarkJ Crowdfunding Project Donor*Special Project $75 donorSpecial Project $250 donor
Post:
I already have BOINC shut down on the Pi. Can I copy the state file somewhere such as my home directory, uninstall BOINC, reinstall BOINC and copy the state file back to the directory it should be? I assume the data directory is /var/lib/boinc-client, correct? Since that is where the state file is.

After some Googling I found this: sudo apt-get purge boinc-manager boinc-client which gets rid of executable, config and data files. This: sudo apt-get remove boinc-manager boinc-client will only get rid of the executable files. If I go with the first I should have no problem, but going with the second I will be in the same boat as I'm in right now. Correct? :)

Sure you can copy the client state file from /var/lib/boinc-client to another folder and then do the "apt purge boinc -y" to get rid of it before reinstalling. Seeing as you keep mentioning the remote desktop I presume you're using it to access a gui on the Pi, but if you wanted to copy it using the command line simply do the following:
cd /var/lib/boinc-client
cp client_state.xml /tmp/client_state.xml

That will make a copy into the /tmp folder.
58) Message boards : Number crunching : Raspberry Pi & Other SBC Computers Discussion Thread :) (Message 1975836)
Posted 18 Jan 2019 by MarkJ Crowdfunding Project Donor*Special Project $75 donorSpecial Project $250 donor
Post:
I use BOINCtasks running on a Windows PC to control my farm. The Pi’s are all headless. No gui needed which frees up memory. You can use BOINCtasks to attach to projects and manage the BOINC side of things. I use putty on the PC to remote into each one when installing and doing OS updates, etc. You don’t need BOINC Manager to control them.

If you’ve got a Windows machine or an x64 Linux that can run wine then I would suggest you simplify and standardise the setup. When you have a number of them the last thing you want is them having different setups. I can drop you a PM about my setup process which starts with imaging the SD card (you’ll need a PC for that too).
59) Message boards : Number crunching : Raspberry Pi & Other SBC Computers Discussion Thread :) (Message 1973487)
Posted 4 Jan 2019 by MarkJ Crowdfunding Project Donor*Special Project $75 donorSpecial Project $250 donor
Post:
Well, the new powered USP hub does not pass enough power to the Pi. The Pi will run, but the power LED is not lit and if you have major access to the MicroSD card, it could get corrupted per what I found on the Internet. So, I'm back to using the included power brick power supply. I need to come up with some other power solution for running 3 Pis.

I use a bunch of Astrotek USB001 chargers. They have 5 ports. I use one port to run fans and the other 4 run the Pi3’s. I designed a case with four Pi3’s side by side with fans on top for cooling. They work quite well even in the hot weather. See http://marksrpicluster.blogspot.com/2018/03/pi4-case-mk-ii.html

A headless Pi3B+ needs around 1.8A when crunching. They recommend 2.5A due to having to supply USB peripherals. When the Pi3 first came out they had 2A power bricks.
60) Message boards : Number crunching : GPU FLOPS: Theory vs Reality (Message 1973164)
Posted 3 Jan 2019 by MarkJ Crowdfunding Project Donor*Special Project $75 donorSpecial Project $250 donor
Post:
At last I have data:

Looks like I might get myself an RTX 2070 for my birthday in a few months.
GTX 1080 Ti (or better) crunching performance, at a maximum of 185W v 250W.

Interesting to see that the GTX 750Ti is still in the top 10 for efficiency.

The RTX 2060 is rumoured to being announced at CES2019 on the 7th of Jan with availability mid-January. It should be approx USD $150 cheaper than the RTX 2070. The Einstein apps however don’t work with RTX at the moment.


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