30 August 2014

30th of August

Farm news
The farm is continuing its Seti crunching. I am aiming for 25 million credits and its currently above 22 million. The farm is doing around 88,000 per day at the moment. The weather has been cool and wet so I have added another one of the Nvidia GPU machines to the task. That takes the current effort to be 3  Nvidia GPU machines and 5 Intel iGPU machines.


SD card woes
As you would have gathered from the last couple of blog posts I have been having some issues with the SD cards on the Raspberry Pi's. This week I purchased 5 new ones and will start replacing them all. I have already thrown 2 cards in the bin.

SD cards are not designed for computers running 24 hours a day, 7 days a week writing data constantly. They simply wear out the memory cells. There is a Linux file system called F2FS (Flash Friendly File System) that would be better suited than the ext4 file system that I am currently using, however its not mature enough yet.


Raspberry Pi B+
While researching Linux file systems I noted that the Raspberry Pi B+ version has replaced the B version that I have. I have ordered one. Its still based upon the same SoC (System on a Chip) but has more USB ports, a lower power consumption, uses a MicroSD card instead of the standard SD card and has a redesigned layout. The connectors are on two edges now.

23 August 2014

23rd of August

Farm news
As per the last 2 posts were still crunching away at Seti. Recent average credit is around 79 to 80k so its still climbing a bit. Total credits are around 21.5 million.

I noticed one of the Intel GPU machines is producing consistently less work than the other Intel GPU machines. They are all meant to be identical. I had a look and found a BIOS setting that might have been causing this and have changed it. The recent average credit is climbing but I can't tell yet as its still not caught up with the others. I could only do this recently because all the machines are running the same mix of work (Seti), before they weren't.

Asteroids have been having a number of issues with running out of space on their server, specifically for uploads. They only have 1 server. They seem to need more disk space so if anyone wants to help out please ask over on their forums. I suggested they get a Drobo rather than a server as their main need seems to be storage.


Update: Sun 24th of August
The oldest of the Raspberry Pi's has been playing up. It dropped off the network and I couldn't access it. After a few goes at rebooting it I reimaged the SD card and then updated Debian only to have it fail again upon rebooting. I have reimaged another SD card and put that in it.

I suspect the card has reached its limit of writes. Apparently they have around 100k write cycles and most name-brand ones incorporate some wear-levelling. Its a name-brand card and supposedly has a lifetime warranty. I don't have the receipt so couldn't return it anyway.

17 August 2014

17th of August

Farm news
Crunching continues for Seti. RAC (recent average credit) has hit 70,000 and total credit has just passed 21 million. My new target is 25 million for total credit before I start cutting back.

I am slowly rolling out the new optimised Seti apps that I mentioned in the last blog post. For each machine I run the down the cache until they are out of work before installing them. I could just stop BOINC, install the apps and then start it up again but I would rather have a clean change over in case something is wrong. It takes about a day to run down the cache on the Intel-GPU machines. The Nvidia-GPU machines will be done last.

I am also noticing that there is a general shortage of work for Seti, probably due to the challenge running at the moment and all the extra computers. Quite often my machines will make work requests and get nothing. BOINC will retry but starts to back-off the requests if it keeps failing to get work.

The Parallella's picked up BOINC 7.4.13 today. I had one Parallella set up to define the Epiphany co-processor and the first thing it did when it came up was to make a scheduler request for some work for it. There wasn't any but at least the client can now request work for a user-defined co-processor. There still aren't any apps that can use the Epiphany at the moment.

14 August 2014

14th of August

Farm news
As I said in the last post the farm is merrily crunching away Seti work. RAC (recent average credit) has now climbed to 65000. That is average credits per day.

Being the middle of the month I got a bunch of windows updates. I have to apply them on 12 machines which all takes time.

I tried installing boinc_app_seti via the repo on a Raspberry Pi. It ran for about 10 minutes before crashing the Pi. I then had to reboot the Pi, remove the app and detach it from Seti. It would appear to be rather unstable. The Pi is now back to crunching for Einstein.


Project news - CPDN
Their database server crashed. Last I heard they have been trying to set up a virtual machine to replace the old server they had. They have been off-line for around 3 days now. While I have completed and upload my tasks I can't report them as completed until they can get the server going.


Project news - Seti
We got updated optimised apps for Seti. They updated the installer to v0.42. See the Lunatics web site http://lunatics.kwsn.net/ for these. I will be running down one of the Intel-GPU machines and installing them on it before I roll them out to the other machines. The CPU apps in particular are faster.

One of the teams (Seti.Germany) are running a challenge from the 15th to the 29th of August. This is timed with the anniversary of the Seti Wow signal back on the 15th of August 1977.