ZCash Mining With Nvidia Telsa

I have two Nvidia Telsa cards that I use for work, they are good for certain tasks around data mining and machine learning, and I have been interested in trying to use them for Zcash mining. I have a Antminer U3 that mines Bitcoins (slowly, and not that well sometimes), however I fancied a go at mining Zcash too. How hard could it be? Harder than it should have been.

Being Cuda cards I would obviously need a cuda enabled miner to use them. I already mine with Antpool, and they allow users to mine Zcash so that bit was easy. What wasn’t easy was trying to get a miner to compile. I tried nheqminer, that wouldn’t compile and also the newest version doesn’t work with the tesla cards I have as they are not compute 5. The older versions wouldn’t compile either. I also had a few problems with getting cuda running on Kubuntu 16.04 as I needed to upgrade the nvidia drivers which was a pain!


I got there in the end as I found a binary of nanopool’s ewbf-miner that works with cuda cards! This works great, I get about 70 Sol/s on the K20 and 95Sol/s on the K40. So that is pretty good, you would get about 40 Sol/s on a i7-6700K CPU @ 4.00GHz. I am sure that with a newer telsa or CPU you would get more. This only an experiment however, not a mining operation so I am happy.

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Kubuntu 16.04 LTS

One of my Opensuse workstations fell over. Weird problem with the login, the sddm-greeter was crashing on start. I reinstalled a bunch of things but it would not come back to life. I decided that the system could do with a restart, the partitioning was a mess and the bootloader was badly installed. The system hadn’t been reinstalled for a lone time.

I decided that I need this system to be stable, and Opensuse gets updated too frequently for some of the software that I run leaving me solving problems with missing libraries or incompatible versions of software. A Linux distro with a longer lifecycle was in order.

My initial thought was to install Centos 7, its RPM based (what I am used to) and has the required stability. However I had problems with Centos and NVidia drivers! Once installed the system would login! Rather than spend ages figuring out how to fix it I decided to which to Ubuntu, or rather Kubuntu (I am a fan of KDE). As a user of Debian for my servers I wasn’t expecting any problems. BTW the partitioner in the Centos install is a mess, they need to sort that out.

Kubuntu was straightforward to install, no problems and the partitioner is easy (take note Centos). I did have a problem that I have encountered before with Ubuntu was that the GUI crashed shortly after system start. This seems to be a problem with the opensource NVidia driver. If you drop to runlevel 3 you can install the proprietary driver and its fine. Which is ok if you don’t mind using it. So far getting the system setup has been painless and I am happy to have the system going again without problem. Now to restore all the data and apps!

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I seem to be constantly trying out different ways of syncing data. I have had no end of problems with unison. Apart from being slow getting build versions to match is a constant source of frustration.

However,  I have found Syncthing, which seems great so far. I have owncloud, which is great for syncing documents; think Dropbox that you own. However I have some data sets that are very large and don’t change much. Owncloud would just get clogged up looking after these. I could use rsync, which is fine, however syncthing has some nice additional features.

Syncthing is a bidirectional sync tool, that can also do versioning if you want it to. It works by running as a web service on your computers and is accessible via a web gui. It keeps directories up to date over a number of computers, there is no copy of the files in the cloud, unless you put one there. So if you delete everything off one computer it will disappear from them all (eventually). It plays well with dynamic IP addresses and firewalls. All traffic between the computers is encrypted, and it is fast. It doesn’t use up too much resource, and I set the sync frequency on my files for 1hr as they are unlikely to change that often, and also only I use them. These are large data sets of source material mainly, and photos that I edit on two computers.

Setup is pretty straightforward, the most tricky bit being auto starting the service on different computers/operating systems. It works well.

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Lightworks, PortAudio, and Opensuse Leap 42.2

I had some more messing about with PortAudio and Lightworks. This time I decided to build my own PortAudio as using a random build it silly.

Its easy after all: Download from:

Then if you build with:
./configure –enable-cxx=yes

then you can either make install as root (then check where it puts them might be the wrong place) or get the libraries out of the folders and dump them into /usr/lib/lightworks
libportaudioccp is in bindings/cpp/lib/.libs/
libportaudio is in lib/.libs/

Make sure you copy the sym links over too. It should then work without problems.

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Lightworks 12.6 and PortAudio – Opensuse 42.2

I had a lot of problems with Opensuse Leap 42.2 and Lightworks. This time it was portaudio that was causing all the problems. It would either hang Lightworks when loading at the point portaudio tried to detected the audio interfaces. Or it would just be a mess of buffer overloads.

I fixed it in a weird way. I downloaded builds of libportaudio2 and libportaudioccp from Ubuntu, for the right architecture. I think unpacked them into /usr/lib/lightworks, which is where lightworks looks first for libraries. This worked, with one additional requirement that you have to use GlobalSettings.txt in your ~/Lightworks directory to make sure that portaudio uses pulseaudio as the interface. This avoids the buffer problems. Do all that and Lightworks 12.6 is happy on Opensuse Leap 42.2.

I am about to try Lightworks 14, see how that works before I pay for the upgrade.

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OwnCloud – its awesome!

I gave up on SpiderOak in the end, it was too resource heavy for my laptops, their batteries were really struggling. The constant encrypting and decrypting was too much. Its a shame because as a backup system for large amounts of data it was really very good. Especially if that data was on desktops or didn’t change much. I couldn’t justify keeping it for this use only, too expensive at $25 a month (which is about £20 now!). So I looked back into OwnCloud.

I tried OwnCloud a number of years ago as I run my own home server anyway. Back then the desktop sync client was just not up to the job. It would take forever to sort out changes and sync them, often using up entire CPU cores on both the server and the client machines. I am pleased to say that problem as been solved and now OwnCloud is a great choice if you are running your own server somewhere anyway. The sync seems to be fast, and the setup is easy. I am using a self-signed SSL certificate, which doesn’t cause much in the way of annoying warnings. OwnCloud has the other obvious advantage that you can really limit the access to the data, and it supports encryption of the data on the server too. Or you can encrypt the drives etc. I have been using it for about 4 months without problem. The only issue I had was when there was a power cut in my house while I was away. Doh! This killed the server obviously.

The downside of course is that with SpiderOak I had a ‘cloud’ copy of all my important data that was at a different location to my house. This is no longer the case. I don’t use OwnCloud to sync all the large data-sets across my computers, I sync those with Unison instead. So to avoid a catastrophic data loss in the event of disaster I have synced all my important data and docs to my office computer using Unison. This is about 1.7TB of data onto a 5TB raid array. The first sync took ages but as this data doesn’t change very much. I also use Amazon Glacier for data that can be essentially archived off and forgotten about, its super cheap.

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Let’s Encrypt!

I had to do it eventually. My security expert credentials (such as they are) were coming under question from my lack of https on my web server. This was partly due to that until recently it would have required additional expense, as additional IPs would been needed and also SSL certificates. Not so anymore! Let’s Encrypt is a great service where you can get free SSL certificates for your website, although I highly recommend giving a small donation if you are able. At this point I would normally write a blog post detailing how I setup the service for my server and websites. However as I run my server on Bytemark’s Symbiosis I didn’t have to do anything other than turn it on. All config done automatically, I did add a file named ‘ssl-only’ to the ‘config’ dir of my hosts to ensure that all traffic is redirected to https. I would have done it sooner but I needed to upgrade the OS on my server and in order to do that I needed to check backups and all that stuff that you should do anyway.

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Chromebook copy-paste from PDF file

This is the first time I have travelled for an extended period of time with only my Chromebook. I would normally take a laptop if I was going to be away for more than a couple of days. Not only that I have to write and then present a talk at a conference. So I need Google Slides to do the business. I was reasonably confident it would, there is however one snag.

I have had bit of a faff copying some sections out of a PDF file to go into my presentation. There is no way to easily copy and paste from any of the PDF tools I have used and Slides will not import a PDF file as an image. This is either because the PDF support in Google Docs just isn’t very mature or a priority for Google or, and I have my suspicion this is part of it, Google doesn’t want you copying out of PDF files. I am not entirely sure why this might be, perhaps they are trying to protect copyright? However, it can be a pain if you are trying to use a figure as part of a talk.

I have found what is a fairly good solution, in fact it might be enough of an obvious (when you figure it out) solution that there isn’t a problem here after all. I learnt how to take screen shots with the Chromebook. Either by:
ctrl+’task select’ and you get the whole desktop, or
ctrl+shift+’task select’ and you can draw a box round a section

Easy, you can either copy the image to the clipboard or save it as a file. Probably easy enough that my conspiratorial ideas of Google somehow blocking it do not really make sense. Just took me a while to figure it out. 🙂 You can even zoom into the bit of the PDF you want before grabbing the screenshot.

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A Beast

I have been cleaning up and resurrecting a beast of a computer. Its a dual Xeon 3.16GHz, with 8GB of RAM. Its not that high spec compared with today’s hardware. Has a fairly average GPU and a RAID card with currently 7x 500GB HDs, and 1TB system disk. I think I will get it going. Maybe find a use for it. Perhaps as web scraper or something. That or I could sell it. Gonna have to get a HD off eBay to make up the 8, that and find the Sata PSU cables!

Oldish Computer


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Poor KDE Performance – Balooctl Disable!

Two of my Opensuse boxes where performing really badly, but only some of the time. I tracked this down to the Baloo file indexing program. This is the tool that indexes your files for search, which is useful but only if it doesn’t cause horrendous performance problems.

The symptoms were a very frustrating desktop performance where the mouse would stutter and every few seconds or so, the system would sort of stop and then start again. It seemed to affect all apps to the point where they were basically unusable. It feels like a constant interrupting of the system, which it might well be.

The solution! Disable Baloo using the following command:
balooctl disable

Then reboot the system and all will be well. I rarely used the file indexing anyway. It would often crash on its own.

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