#1 - Page 9

Xyzzy · 2020-01-10, 15:20

We have set up a dynamic DNS IP address forwarding thingie so others can log into the system (SSH) to test things.

If you are interested in this just let us know via PM.

Xyzzy · 2020-01-10, 15:57

Here is a picture of the system all set up.

On the lower left is a small (450VA) UPS and our ancient wireless keyboard/mouse combo. The LCD is also ancient but it works. We were going to do everything headless but we had the LCD so why not use it? We sit very close to this so we can see the temperature readout easily. We ended up using the onboard Wifi for network connectivity. The UPS is severely undersized but it should be enough to get through the small power blips we have out here in the middle of nowhere.

Nick · 2020-01-10, 16:13

It looks cool!
Have you done any EMC testing on the glass case?
I assume the WiFi antenna is still mounted on the outside!

Xyzzy · 2020-01-10, 16:21

The antennas are hanging out the back, off of the I/O plate on the motherboard.

We haven't done any special testing other than to make sure the connection is up.

The downside to using WiFi is we have to use a non-free package.

https://packages.debian.org/buster/firmware-iwlwifi

Code:

m@tr:~$ vrms
                 Non-free packages installed on tr

firmware-iwlwifi                    Binary firmware for Intel Wireless cards

  1 non-free packages, 0.1% of 1506 installed packages.

PhilF · 2020-01-10, 16:43

Quote:

Originally Posted by Xyzzy

The downside to using WiFi is we have to use a non-free package.

https://packages.debian.org/buster/firmware-iwlwifi

Code:

m@tr:~$ vrms
                 Non-free packages installed on tr

firmware-iwlwifi                    Binary firmware for Intel Wireless cards

  1 non-free packages, 0.1% of 1506 installed packages.

I'm not sure how that's a downside?

VBCurtis · 2020-01-10, 17:05

I'm no security expert, but I've found fail2ban a very useful (if not necessary) program for my internet-facing machines.

An aliquot sequence or two are interesting ways to gain experience with factoring tools. You can automate every step with yafu and aliqueit, or have aliqueit exit every time a composite above some threshold survives ECM so that you can play with parameters & programs more manually.

Also, this thread encouraged me to explore upgrade options for my own hardware, where I [re]discovered that X99 boards that support the old 6-core Haswell chips also support Xeons of that era. So, $150 later, my 5820 i7 is now a Xeon 2680v3 12 core@2.5ghz and my most powerful matrix-solving chip.

Xyzzy · 2020-01-10, 19:08

Quote:

Originally Posted by PhilF

I'm not sure how that's a downside?

Whenever possible, we use "free" software. It is a personal decision that we make for philosophical reasons.

Quote:

Originally Posted by VBCurtis

So, $150 later, my 5820 i7 is now a Xeon 2680v3 12 core@2.5ghz and my most powerful matrix-solving chip.

preda · 2020-01-11, 12:40

Quote:

Originally Posted by VBCurtis

So, $150 later, my 5820 i7 is now a Xeon 2680v3 12 core@2.5ghz and my most powerful matrix-solving chip.

Out of curiosity, where did you buy the old xeon?

VBCurtis · 2020-01-11, 17:18

Ebay. The seller's name was "pccompd".

Here's the listing (dunno how permanent such a link is):
https://www.ebay.com/itm/193283688016

Xyzzy · 2020-01-12, 23:26

Quote:

Originally Posted by Xyzzy

How do you manage many-core ECM work?

Would this be useful?

We wanted to play with GNU Parallel, so here is a quick command for ECM work.

seq 5 | parallel -j 2 -n 0 nice -19 ecm -inp c1133.txt -timestamp 1e9 | tee -a results.txt

This example runs the command five times and it sends the output to the display and appends the output to a file. Parallel schedules all of the jobs, in this case using a maximum of two threads at a time.

Note that it is very easy to run out of memory doing this!

Xyzzy · 2020-01-12, 23:37

Even better with real-time progress information!

seq 5 | parallel -j 2 -n 0 --progress nice -19 ecm -inp c1133.txt -timestamp 1e9 >> results.txt

Silly example:

Code:

$ seq 1000 | parallel -j 10 -n 0 --progress nice -19 ecm -inp c1133.txt -one -timestamp 1e5 >> results.txt

Computers / CPU cores / Max jobs to run
1:local / 24 / 10

Computer:jobs running/jobs completed/%of started jobs/Average seconds to complete
local:10/500/100%/0.3s

2020-01-10, 15:57	#90
Xyzzy Aug 2002 10000111010011₂ Posts	Here is a picture of the system all set up. On the lower left is a small (450VA) UPS and our ancient wireless keyboard/mouse combo. The LCD is also ancient but it works. We were going to do everything headless but we had the LCD so why not use it? We sit very close to this so we can see the temperature readout easily. We ended up using the onboard Wifi for network connectivity. The UPS is severely undersized but it should be enough to get through the small power blips we have out here in the middle of nowhere. Attached Thumbnails

2020-01-10, 16:21	#92
Xyzzy Aug 2002 8659₁₀ Posts	The antennas are hanging out the back, off of the I/O plate on the motherboard. We haven't done any special testing other than to make sure the connection is up. The downside to using WiFi is we have to use a non-free package. https://packages.debian.org/buster/firmware-iwlwifi Code: m@tr:~$ vrms Non-free packages installed on tr firmware-iwlwifi Binary firmware for Intel Wireless cards 1 non-free packages, 0.1% of 1506 installed packages.

2020-01-10, 17:05	#94
VBCurtis "Curtis" Feb 2005 Riverside, CA 2·2,927 Posts	I'm no security expert, but I've found fail2ban a very useful (if not necessary) program for my internet-facing machines. An aliquot sequence or two are interesting ways to gain experience with factoring tools. You can automate every step with yafu and aliqueit, or have aliqueit exit every time a composite above some threshold survives ECM so that you can play with parameters & programs more manually. Also, this thread encouraged me to explore upgrade options for my own hardware, where I [re]discovered that X99 boards that support the old 6-core Haswell chips also support Xeons of that era. So, $150 later, my 5820 i7 is now a Xeon 2680v3 12 core@2.5ghz and my most powerful matrix-solving chip. Last fiddled with by VBCurtis on 2020-01-10 at 17:08

2020-01-10, 15:20	#89
Xyzzy Aug 2002 7×1,237 Posts	We have set up a dynamic DNS IP address forwarding thingie so others can log into the system (SSH) to test things. If you are interested in this just let us know via PM.

2020-01-10, 16:13	#91
Nick Dec 2012 The Netherlands 11100101100₂ Posts	It looks cool! Have you done any EMC testing on the glass case? I assume the WiFi antenna is still mounted on the outside!

2020-01-11, 17:18	#97
VBCurtis "Curtis" Feb 2005 Riverside, CA 1011011011110₂ Posts	Ebay. The seller's name was "pccompd". Here's the listing (dunno how permanent such a link is): https://www.ebay.com/itm/193283688016