Posts by MarkJ


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1) Message boards : Number crunching : Win 10 will be a FREE Upgrade to Win 7 & 8 Users!!! (Message 1636946)
Posted 27 days ago by Profile MarkJProject donor
Apparently also for the Raspberry Pi 2 as well. This post on the Raspberry Pi site (www.raspberrypi.org).

Windows 10
For the last six months we’ve been working closely with Microsoft to bring the forthcoming Windows 10 to Raspberry Pi 2. Microsoft will have much more to share over the coming months. The Raspberry Pi 2-compatible version of Windows 10 will be available free of charge to makers.

Visit WindowsOnDevices.com today to join the Windows Developer Program for IoT and receive updates as they become available.
2) Message boards : Number crunching : Errors using Intel GPU (Message 1636942)
Posted 27 days ago by Profile MarkJProject donor
Any ideas on this? Thanks.

The most common issue with the Intel HD graphics is their drivers. Basically only 1 or 2 of them work properly for crunching. I don't have HD2500, but I do have machines with HD4000 Graphics and use the 10.18.10.3621 drivers (Win7 64 bit). I would suggest you try and get that version if you can. Intel have a habit of hiding the older drivers though so you might not be able to find them in the Intel Download Center. Richard might have a link if you can't find it.

There are a few message threads going about the same issue but the users concerned might be using different models of Intel GPU's, such as this thread
3) Message boards : Number crunching : Show and tell your machine. Here's mine. (Message 1636577)
Posted 28 days ago by Profile MarkJProject donor
And just for laughs I thought I throw this one in...



Parallella
4) Message boards : Number crunching : Linux mount issue on Parallella (Message 1634014)
Posted 28 Jan 2015 by Profile MarkJProject donor
Found this:

https://github.com/parallella/parallella-ubuntu

7. Enable devtmpfs and make SD card accessible from Parallella cd /media/$USER/rootfs/dev sudo mknod -m 660 mmcblk0 b 179 0 sudo mknod -m 660 mmcblk0p1 b 179 1 sudo mknod -m 660 mmcblk0p2 b 179 2


really strange, seems to be a really heavy stripped down distri.

There isn't anything under /media, so did the following which seem to have got it going.

x2:/media> sudo mkdir linaro
x2:/media> sudo chown linaro:linaro linaro
x2:/media> cd linaro
x2:/media/linaro> sudo mknod -m 660 mmcblk0 b 179 0
x2:/media/linaro> sudo mknod -m 660 mmcblk0p1 b 179 1
x2:/media/linaro> sudo mknod -m 660 mmcblk0p2 b 179 2
x2:/media/linaro> ls
mmcblk0 mmcblk0p1 mmcblk0p2
x2:/media/linaro> cd ..
x2:/media> sudo mkdir boot
x2:/media> cd linaro
x2:/media/linaro> sudo mount mmcblk0p1 /media/boot
x2:/media/linaro> ls /media/boot
devicetree.dtb parallella.bit.bin uImage

Thank you Highlander.
5) Message boards : Number crunching : Linux mount issue on Parallella (Message 1633520)
Posted 27 Jan 2015 by Profile MarkJProject donor
"does not exist" describes it...

What do you get from listing what devices are there?

ls -lh /dev/{mm,sd,hd}*

?

(That cryptic short-hand lists all the usual media types.)

x2:/dev> ls -lh /dev/mm*
ls: No match.
x2:/dev> ls -lh /dev/sd*
ls: No match.
x2:/dev> ls -lh /dev/hd*
ls: No match.

Here's the short list of whats in there:
x2:/dev> ls agpgart dsp1 loop1 midi02 null ram14 random sndstat tty6 audio dsp2 loop2 midi03 port ram15 rmidi0 stderr tty7 audio1 dsp3 loop3 midi1 ptmx ram16 rmidi1 stdin tty8 audio2 fb0 loop4 midi2 pts/ ram2 rmidi2 stdout tty9 audio3 fd loop5 midi3 ram ram3 rmidi3 tty ttyPS0 audioctl full loop6 mixer ram0 ram4 sequencer tty0 urandom char/ input/ loop7 mixer1 ram1 ram5 shm tty1 zero console kmem mem mixer2 ram10 ram6 smpte0 tty2 core kmsg midi0 mixer3 ram11 ram7 smpte1 tty3 dri/ log midi00 mpu401data ram12 ram8 smpte2 tty4 dsp loop0 midi01 mpu401stat ram13 ram9 smpte3 tty5


Is your sdcard compatible with the Parallela hardware?...

Good luck,
Martin

Well as far as I know it is, has been running for the last 6 months. They are Sandisk ones in both machines. Besides if I plug a USB hard disk or a USB memory stick in they can't be mounted either. Its almost as if its been setup to not see any other device when plugged in.

As a work around I ended up using Dropbox and then doing a wget to copy it across. Doesn't solve this problem though or explain why.
6) Message boards : Number crunching : Linux mount issue on Parallella (Message 1632996)
Posted 26 Jan 2015 by Profile MarkJProject donor
Tried that too, unfortunately didn't work.

x2:/mnt> ls -l -h
total 4.0K
drwxr-xr-x 2 root root 4.0K Jan 24 16:33 boot/
x2:/mnt> sudo mount /dev/mmcblk0p1 /mnt/boot
mount: special device /dev/mmcblk0p1 does not exist
x2:/mnt>
7) Message boards : Number crunching : Linux mount issue on Parallella (Message 1632418)
Posted 25 Jan 2015 by Profile MarkJProject donor
I doubt there is a colon in the actual device name.

It doesn't make any difference, still the same message apart from the colon.
8) Message boards : Number crunching : Linux mount issue on Parallella (Message 1632107)
Posted 24 Jan 2015 by Profile MarkJProject donor
does the mount-point /mnt/boot exist? if not then mkdir it.

Yes I did a sudo mkdir boot while in the /mnt directory. It will tell you when you try the mount if the directory doesn't exist.
9) Message boards : Number crunching : Linux mount issue on Parallella (Message 1632068)
Posted 24 Jan 2015 by Profile MarkJProject donor
I've got a couple of Parallella. they work fine running BOINC and Einstein. I'm trying to test a seti@home app on them but I am having issues copying the files across.

The Parallellas are running Ubuntu trusty. Main storage/boot is an SD card. The SD card has 2 partitions, a smallish boot partition in FAT format and the rest in ext4 format.

I tried copying the file onto the boot partition using a windows PC, no problems there, moved the SD card back over to the Parallella and off it goes. I can't seem to mount the boot partition though.

When that didn't work I tried copying it on a USB memory stick (aka thumb drive) and plugging that in. Again it doesn't seem to want to mount.

dmesg shows it being recognised, so its probably me in that I can't get it to mount partition 0:
mmc0: new high speed SDHC card at address e624
mmcblk0: mmc0:e624 SU08G 7.40 GiB
mmcblk0: p1 p2


when I try the mount command I get:
sudo mount -t vfat mmcblk0p1: /mnt/boot
mount: special device mmcblk0p1: does not exist


Other suggestions about using blkio that google returns don't seem to help either. It simply returns to the command prompt with no display.
sudo blkid


I expect its simply me using the wrong syntax. Any help would be appreciated.
10) Message boards : Number crunching : Upgrade from 1366 to skylake? (Message 1628867)
Posted 17 Jan 2015 by Profile MarkJProject donor
I got a couple of Haswell-E's to replace a couple of i7-970's and I am somewhat underwhelmed by the performance boost. I would have thought going from a 1st generation i7 to a 5th generation (or maybe it should be called 4.5) would have given better, but it didn't. My advice is to wait.
11) Message boards : Number crunching : Show and tell your machine. Here's mine. (Message 1619677)
Posted 28 Dec 2014 by Profile MarkJProject donor
Ok, so I stand corrected, still that's a nice motherboard, I'd have gone for the 5930K(40 lanes, 5820K cpus only have 28 lanes) and an Asrock X99 OC Formula.

I looked very seriously at that. The problem was the price difference between the chips. All the 5930K gets is extra PCIe lanes and a 200Mhz speed up. It would have cost an extra $300.

Ideal would have been the top of the line chip but I might have to wait for the price to come down. They get less speed (3Ghz) the same 40 PCIe lanes as the 5930K and an extra core/2 threads. It was about $800 more.
12) Message boards : Number crunching : Show and tell your machine. Here's mine. (Message 1619568)
Posted 28 Dec 2014 by Profile MarkJProject donor
looks very nice
what kinda cards are those ?

i am in the process of building a little amd dual core with a 780gtx in it made from junk and spare parts

EVGA GTX750Ti's the FTW version

They look nice, though that looks like a Gigabyte lga2011 UD3 motherboard, I can't tell what size of psu that is though or the case, still it looks nice.


  • Fractal Designs ARC Midi R2 case
  • Seasonic 750w modular power supply
  • Asus X99A motherboard (socket 2011-v3)
  • Intel Core i7-5820k CPU (6 cores/12 threads @ 3.3Ghz)
  • 16Gb (4 x 4Gb) Kingston DDR4 memory @ 2133Mhz
  • Corsair H80i sealed water cooling, replaced fans with Noctua
  • 2 x EVGA GTX750Ti graphics cards
  • Pre-loved WD Black 1Tb HDD
  • Intel 520 series 120Gb SSD
  • Generic DVD reader


I think the air-flow is out of balance. There are more fans removing air than drawing air into the case. I might move one of the top fans to the front of the case.

13) Message boards : Number crunching : Show and tell your machine. Here's mine. (Message 1619496)
Posted 27 Dec 2014 by Profile MarkJProject donor
looks very nice
what kinda cards are those ?

i am in the process of building a little amd dual core with a 780gtx in it made from junk and spare parts

EVGA GTX750Ti's the FTW version
14) Message boards : Number crunching : Show and tell your machine. Here's mine. (Message 1619324)
Posted 27 Dec 2014 by Profile MarkJProject donor
Here's a pic of my latest build. I got a pair of these.

15) Message boards : News : Running out of workunits (Message 1601399)
Posted 15 Nov 2014 by Profile MarkJProject donor
Thanks for the post Matt. Whatever happened to getting data from the Parkes radio telescope?

Also is the GBT a regular feed or will it suffer from the same funding/being off-line issues that Arecibo has?

Cheers
16) Message boards : Number crunching : Your thoughts on the upcoming Haswell E CPUs (Message 1596393)
Posted 3 Nov 2014 by Profile MarkJProject donor
I've ordered a couple of rigs with the following specs. Memory ended up on back order so waiting for it before the shop can complete the build.

Asus X99-A motherboard
16Gb Kingston DDR4 @2133Mhz (4x4Gb)
Intel 5820k CPU
Corsair H80 water cooling
2 x GTX750Ti cards
Intel 520 series SSD (120Gb)
1Tb WD black HDD
Fractal designs ARC midi case
Seasonic modular 750w power supply
No-name DVD-ROM

The price for the next chip up would have added about $500 (AUD). The top of the line chip was about $1100.

Even Intel recommend water cooling, hence the H80. I replace the Corsair fans with Noctua ones as they don't make as much noise and last. Had a corsair fan seize up on a previous rig.
17) Message boards : Number crunching : gpu tasks - don't got any (Message 1590666)
Posted 23 Oct 2014 by Profile MarkJProject donor
Look in the BOINC event log and see what it's got to say. At the beginning it should say it's detected the cpu and GPU and driver version etc. later on there should be a message about requesting work, which hopefully will say it's asking for GPU work. It would help if you could post the startup messages about the cpu and GPU and the requesting work messages.

To get to the BOINC event log you can click on advanced (on the menu bar in BOINC manager) -> Event log
18) Message boards : Number crunching : Flash Drive for Boinic projects (Message 1588502)
Posted 17 Oct 2014 by Profile MarkJProject donor
I had to replace all the SD cards used on my Raspberry Pi's. They are supposedly rated for 100k writes. I got about a year out of them.

In the BOINC settings you can adjust the "write to disk" frequency. I currently have them to 600 seconds.
19) Message boards : Number crunching : all these different versions for AP cpu's? (Message 1586211)
Posted 13 Oct 2014 by Profile MarkJProject donor
No we're not testing them, that's already been done on Seti Beta.

As you noted they refer to the different CPU instructions. Some people may have older machines that don't support SSE2 for example, or it may be that the SSE2 app is slower on their particular machine.

As a general rule go for the highest instruction set app that your CPU can support, but it doesn't always mean its faster.
20) Message boards : Number crunching : headless computer? (Message 1575363)
Posted 21 Sep 2014 by Profile MarkJProject donor
I run a bunch of Raspberry Pi's headless. They run Debian Linux and I just ssh into them to do stuff and BOINCtasks running on windows laptop to keep an eye on them.

For my windows machines I use a KVM and have a single monitor/keyboard between a bunch of them. I use BOINCtasks to keep an eye on them as well. With the windows boxes you get the windows updates and driver updates to apply but that's typically once a month.


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