Posts by ivan


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1) Message boards : Number crunching : Computer Upgrades - normal or not? (Message 1571166)
Posted 6 days ago by Profile ivan
Thanks, actually I am having an issue with installing NVidia drivers in Linux.
I had no problems with the 210 card but the 'new' (eBay) 8800GTS is giving me problems. I'm a Win XP 'refugee' so need to 'have my hand held' with Linux (Mint 16 Petra)I've tried manual install through terminal but nothing has worked so far
Couple of people on Mint forum are helping out, posting scripts I can just cut and paste into terminal

a) Using Firefox/Chrome, go to www.nvidia.com, find their driver download area and download the latest qualified driver for your flavour (32/64-bit) Unix.
b) Make sure your system is up-to-date - sudo apt-get update; sudo apt-get upgrade.
c) reboot -- sudo reboot
d) If b) loaded new kernels, you may find error messages. Select the option to drop into a command-line terminal, or if (limited) graphics go there with Ctrl-Alt-F[1|2] (probably 2)
e) sudo telinit 2
f) sudo service stop mdm; sudo pkill -9 X -- (to be sure, to be sure)
g) cd to where you downloaded NVIDIA...run (insert proper filename here et seq.)
h) sudo chmod +x NVIDIA...run
i) sudo ./NVIDIA...run -- in general take default options
j) sudo reboot
k) report problems here in case my memory's faulty!
2) Message boards : Number crunching : NVIDIA Jetson TK1 (Message 1567807)
Posted 13 days ago by Profile ivan
GT 640 which had developed a faulty fan -- the third Gigabyte GPU that's done that to me now! :-( )..
Just ordered a replacement fan from China on eBay for about £1.50, so might be back in action by the end of the month. Otherwise I'll get the Asus GT640-1GD5-L as a replacement -- it has to fit in a single-width slot with only about 5 mm extra clearance.
3) Message boards : Number crunching : NVIDIA Jetson TK1 (Message 1567691)
Posted 13 days ago by Profile ivan
Any patches or recommendations for X-branch ? It's on idle while I address some complex Boinc issues, but I don't stop taking issues for the ToDo list :)

No, IIRC it just compiled as usual on the Jetson.
No real problems with the s@h, just the missing include I reported last January, and I had to edit the config file to remove the old compute capabilities that nvcc didn't like and put in 3.2 for the Tegra.
I had to add
#include <unistd.h>
to client/analyzeFuncs.h to bring in sleep() on my Mint system.
4) Message boards : Number crunching : NVIDIA Jetson TK1 (Message 1567589)
Posted 13 days ago by Profile ivan
Yeah, that's me. ... It runs about 1/10th the speed of my GTX 750 Ti, but takes perhaps 1/15th the power. I've got my wattmeter at work now so I'll try to get some power figures soon (got the chance to grab it when I had to shut down my home machine last night to remove the GTX 640 which had developed a faulty fan -- the third Gigabyte GPU that's done that to me now! :-( ).

OK, some figures. At idle, the wattmeter was showing 9 W at the socket (it was 4 W with the machine shut down, so that's about the inefficiency of the power supply). Running two CUDA jobs simultaneously shows 16 W, with occasional drops to 14 W and sometimes 11 W.
5) Message boards : Number crunching : NVIDIA Jetson TK1 (Message 1566730)
Posted 15 days ago by Profile ivan
14 W for 300 GFLOP/s sounds amazingly efficient. Would this work? A review of the board is here:
http://www.itpro.co.uk/desktop-hardware/22731/nvidia-jetson-tk1-review
Here is one actually running.
http://setiathome.berkeley.edu/show_host_detail.php?hostid=7354060
As I recall they had to compile the app for the hardware & there was quite a bit of effort to get it producing valid results.
Yeah, that's me. I had to add some ifdefs to the machine-code routines (someone else worked that out...) to get the floating-point working right. Note that the results it's producing are purely from the GPU. I've compiled the CPU code and it seems to run fine standalone but under BOINC itself it throws an exception. I haven't had time to try to debug this.
Also note that some CUDA code I have for reconstructing digital holograms compiled and ran without any code changes on the system -- I just had to change the location of the includes and libraries in the Makefile. It runs about 1/10th the speed of my GTX 750 Ti, but takes perhaps 1/15th the power. I've got my wattmeter at work now so I'll try to get some power figures soon (got the chance to grab it when I had to shut down my home machine last night to remove the GTX 640 which had developed a faulty fan -- the third Gigabyte GPU that's done that to me now! :-( ).

For the money I am sticking with Bay Trail-D. TheASRock Q1900-ITX I bought recently only cost around $80 US, or about £50 GB (with VAT I imagine more), & looks to be running around 3200-3500 for RAC. My system total is around 25w, but once optimized I am hoping to get closer to 15w at full load.
Mine (Acer Aspire XC-603) is running around 1250, but that's on Linux and without using the GPU. Cost £130.
6) Message boards : Number crunching : Show and tell your machine. Here's mine. (Message 1566075)
Posted 17 days ago by Profile ivan
... I turned hyperthreading off to see what the difference might amount to.

Let us know for what you find for the 'hyperthreading'.

For my own applications, I've been very underwhelmed with the throughput and I'm left wondering if the whole idea is a x2 Marketing ploy for a meagre x1.1 performance...

Happy fast crunchin',
Martin

When Intel first released HT I think their statement was something along the lines of 15-20% gains could be expected from the use of HT.

In the early days of HT, I did some extensive testing and the results were very underwhelming. I finally found that running HT off was more stable when OCing and ran cooler. I have not used HT since.

My leaning is not to run HT as these are research machines and we are more interested in single-thread efficiency than overall throughput; but, I'll run like this for some time if I can. It's not often I get to play with two identical machines simultaneously.
7) Message boards : Number crunching : SETI@Home Wow!-Event 2014 (Message 1564999)
Posted 19 days ago by Profile ivan
So, it would appear that he is indeed using SETI to load test computer banks in a data center. And yes, I feel that he should be disqualified in the Wow! Event competition. It was not fair to all other contestants, whether individual, team or group.

Just as well that I didn't participate then, and raise your ire. !-)
The "stress testing" does come in handy at times...
8) Message boards : Number crunching : Show and tell your machine. Here's mine. (Message 1564988)
Posted 19 days ago by Profile ivan
Similar spec to my new server -- I got one half of it running today. Here's a view from the back showing the two redundant power supplies in the middle and one of the server slides. Hasn't got any GPUs (yet... :-) but there's 128 GB of RAM in each server.

Second half is now up and running. I turned hyperthreading off to see what the difference might amount to.

I will be interested to see how it compares to my 12c/24t machine. I limit it to 20 tasks at a time.

Actually, I am running a 12-core machine without Hyperthreading (it's the server for my Xeon Phi, which is unfortunately unsuited to s@h). Its RAC is about 30% less than yours, which is probably partly explained by the 17% lower clock but also by Linux/Windows differences. With two identical machines, down to the smallest detail, running one with and one without HT perhaps I can convince myself which way is best. At the moment, the second machine is one day younger and a bit behind -- but it managed to grab a large bunch of AP jobs and at one point was crunching 18 of them at once; at 15 hours or so each and 14 still pending, that left a bit of a hole in its earnings so far.
9) Message boards : Number crunching : Show and tell your machine. Here's mine. (Message 1563772)
Posted 21 days ago by Profile ivan
Similar spec to my new server -- I got one half of it running today. Here's a view from the back showing the two redundant power supplies in the middle and one of the server slides. Hasn't got any GPUs (yet... :-) but there's 128 GB of RAM in each server.

Second half is now up and running. I turned hyperthreading off to see what the difference might amount to.
10) Message boards : Number crunching : Show and tell your machine. Here's mine. (Message 1563267)
Posted 22 days ago by Profile ivan
I guess this is the spot to brag! I brought this beast online a few weeks ago after years of laptop-only crunching.Included are 2 Xeon E5-2690 V2s (20 cores, 40 threads), a 1250 W Seasonic PSU, 2 8GB Crucial ECC DIMMs, 2 EVGA GTX 780Ti Superclocked GPUs in SLI, 2 Samsung 850 Pro SSDs in RAID 1, and a Blu-Ray burner, all running on an ASUS Z9 P8-DE WS motherboard.

Similar spec to my new server -- I got one half of it running today. Here's a view from the back showing the two redundant power supplies in the middle and one of the server slides. Hasn't got any GPUs (yet... :-) but there's 128 GB of RAM in each server.
11) Message boards : Number crunching : Show and tell your machine. Here's mine. (Message 1562226)
Posted 24 days ago by Profile ivan
Commiserations.
I just went in on a holiday Monday to uncover my new beast. Pictures tomorrow I hope, it's currently lying naked on the floor after I ripped off its covering of cardboard and polystyrene... I'm concurrently retiring a few machines whose GFlop/Watt rating is falling way below what newer kit provides. 40 Xeon cores should boost my RAC a bit! :-)
12) Message boards : Number crunching : Energy Efficiency of Arm Based sysetms over x86 or GPU based systems (Message 1559119)
Posted 30 days ago by Profile ivan
Now the SSD I was using to offload the stress on the limited onboard storage has stopped working, so that project is out for the week (I have to go to a meeting Up North).

Turns out not to be the SSD, I just lost the mount points for it. I can manually mount the partitions -- I'll sort out a more permanent arrangement next week. Then I couldn't do name-server lookups so time was way out and no connections to s@h -- fixed that by manually configuring /etc/resolv.conf, ubuntu is doing some weird things in dnsmasq.
13) Message boards : Number crunching : Panic Mode On (89) Server Problems? (Message 1558730)
Posted 31 days ago by Profile ivan
What could be wrong in my config ; where to look after ? What can I do to get GPU WU ? Ubuntu 14.04, two GTX780 with CUDA6, system works well with F@H. That one is stopped fully so system is dedicated to SETI right now.

There isn't a "stock" CUDA MB build for Linux. There is an AP build for it; if you've just signed up and are not using "anonymous platform" you will get AP jobs when they are available, but as you can see there aren't any available at the moment.
14) Message boards : Number crunching : Energy Efficiency of Arm Based sysetms over x86 or GPU based systems (Message 1558710)
Posted 31 days ago by Profile ivan
Ivan,

Have you thought about compileing the apps to run on the CPU, to get some performance values of the individual Cortex a15 CPU's?

**Nevermind I see you already have some CPU based WU starting to process on it now**

I haven't had any luck with it. Runs OK standalone, but when I fire it up under BOINC it errors out.
Now the SSD I was using to offload the stress on the limited onboard storage has stopped working, so that project is out for the week (I have to go to a meeting Up North).
15) Message boards : Number crunching : Show and tell your machine. Here's mine. (Message 1555911)
Posted 37 days ago by Profile ivan
You just need some external PCIe enclosures for those servers.

That might be just a bit hard to sell to TPTB! Maybe if I win Euromillions.
16) Message boards : Number crunching : Show and tell your machine. Here's mine. (Message 1555892)
Posted 37 days ago by Profile ivan
Just took delivery of these boxes. Each box contains a 2U rack-mount chassis. Each chassis contains four independent servers. Each server contains two 10-core Xeons (with hyperthreading) and 128 GB of RAM. So, 4x4x2x10x2=640 threads...
Unfortunately I can't run s@h on them, they're for our particle-physics GRID-computing data centre.
But watch this space.
There's got to be a way to hang a bunch GPUs off of them. Send one my way and I'll figure it out. I'll pay for shipping and the electric bill somehow.

Not easily. Cramming four sleds into a 2U rack-unit means there's no space for a double-width PCI-e slot. But fear not, I said to watch this space and today I got word that on Friday I'll take delivery of essentially the same chassis, but with two of these instead, with the same basic specs, and they are definitely designed to take GPUs or coprocessors. And it will be totally under my control; I typically run "stress-testing" software on such systems with the full knowledge of my manager. I'll be retiring two older systems as I bring this online, but they have a total RAC of only 1,500 between them (my Jetson is already up to 630 after only seven days). I'm also eyeing a disk server I've just inherited (out of warranty) and installed as a (20 TB) data-store and archive unit, which has eight cores currently mostly idle...
17) Message boards : Number crunching : Show and tell your machine. Here's mine. (Message 1555563)
Posted 38 days ago by Profile ivan
Just took delivery of these boxes. Each box contains a 2U rack-mount chassis. Each chassis contains four independent servers. Each server contains two 10-core Xeons (with hyperthreading) and 128 GB of RAM. So, 4x4x2x10x2=640 threads...
Unfortunately I can't run s@h on them, they're for our particle-physics GRID-computing data centre.
But watch this space.
18) Message boards : Number crunching : Show and tell your machine. Here's mine. (Message 1555069)
Posted 38 days ago by Profile ivan
Anyway, to illustrate what I've been posting in the low power thread, here are a couple of shots of my Jetson development kit, before and after adding an external SSD.

How many of those pins are GPIO, and how many are i2c and SPI? I haven't found the docs on that yet.

You should be able to get to the Jetson TK1 Support page. The PM375 Module Specification document gives the names of all the pins; I haven't found a more-verbose description yet but the schematics are there too, if you can read them. Note there are several other interfaces brought out here too, such as LVDS for an LCD panel, touch input, etc.

The price is certainly right.

That sounds like a seriously cool board. Raspberry Pi has it's uses, but this sounds like it's useful for more than just home automation stuff done on the cheap (Raspberry Pi B+ for $35 is really hard to beat).
19) Message boards : Number crunching : a lot of pending WUs...... (Message 1554215)
Posted 41 days ago by Profile ivan
wow 1200 the ghost of wiggo will be around long after he kicks the bucket and there i thought i had heaps

4,906 pending here, buddy.

I've only got 1,445. :-{(>
20) Message boards : Number crunching : Show and tell your machine. Here's mine. (Message 1553587)
Posted 42 days ago by Profile ivan
LOL...no, no nixies in the computer.
Although the color in the pic does evoke their glow. Those are just some LED illuminated push button switches on the edge of the mobo.

I do own one of these, though.....

I remember even earlier dekatrons, where the glowing athodes were arranged in a circle, 0-9, and guide cathodes in between could "increment" the glowing cathode quite simply -- a counting circuit in a not-vacuum tube.
Anyway, to illustrate what I've been posting in the low power thread, here are a couple of shots of my Jetson development kit, before and after adding an external SSD.
(Sorry, embedding the images didn't work for some reason, so you'll have to click on the lynx.)


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