Since I can see that second computer got SoB tasks, it looks like you already figured out what was misssing...(?)
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Welcome to PrimeGrid!

And also welcome to the wonderful and confusing world of BOINC venues. You stumbled into a fairly common problem.

BACKGROUND EXPLANATION:

(The nomenclature isn't terribly consistent. What I refer to as "venues" is often called "locations". If you see one or the other anywhere on the website, they're referring to the same thing. Likewise, the "<blank>" venue and the "---" venue refer to the same venue.)

BOINC doesn't let you control computers individually. Instead, you assign each computer to a venue, and then you select the sub-projects for that venue. BOINC has four venues: "<blank>", "home", "school", and "work". A while ago I modified our version of BOINC to add 10 more venues, so we have 14 total.

A computer will therefor get tasks according to the preferences you set for that venue.

New computers are assigned to the venue defined as your "default" venue. The venue to which existing computers belong can be changed at any time.

Except for the "<blank>" venue, none of the other venues exist until you explicitly create them.

If you have a computer belonging to a venue that doesn't exist, the server chooses which tasks to send.


CURRENT SITUATION:

* Your default venue is "home".

* The "home" venue isn't defined.

* The "<blank>" venue is set up to send both SoB and TRP-Sieve tasks.

* One of your computers (521171) is in the "home" venue, so the server is sending whatever it wants to send.

* The other computer (521149) is in the "<blank>" venue, so it's getting SoB and TRP-Sieve tasks, as per the settings.


STEPS TO FIX:

* Change your default venue to "<blank>". Go to the preferences page http://www.primegrid.com/prefs.php?subset=project, scroll down, and click on "Edit PrimeGrid preferences". About 7 lines from the top you'll see "Default computer location". Change that from "home" to "---". (Don't hit "update preferences" yet.)

* De-select TRP-Sieve: Scroll down a bit more than halfway on that page until you see the sub-project "The Riesel Problem Sieve (TRP-Sieve)". To the right is a box which is checked. Un-check that box. Now scroll all the way to the bottom of the page and click on "Update Preferences".

* Change the computer currently in the "home" venue to be in the "<blank>" venue. Go to your hosts page http://www.primegrid.com/hosts_user.php. You'll see both of your computers there. Notice that 521171 lists "home" as its venue while 521149 has nothing in the venue column. Click on the "details" link for 521171. At the bottom of the host details webpage is a selection box for this host's venue. Change it from "Home" to "---". Now hit "Update".

Everything should now be set up such that only SoB tasks will be sent to these computers, as well as any additional computers you add later on.

Finally, it's okay to abort the TRP-Sieve tasks. Aborting them won't hurt anything.
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One good thing about this software is that it must not use the GPU and isn't overheating my CPU. On one of my i7s, I could run only two threads of the GIMPS software or it would make my CPU too hot. Other computers I had to limit to two or three threads. I have eight threads running on it now, and the CPU temperature is fine!

Thanks, I did that, and I will be adding more computers. One question: one i5 only has 4GB whereas the others all have at least 12GB. Is 4GB enough?

STEPS TO FIX:

Thanks, I did that, and I will be adding more computers. One question: one i5 only has 4GB whereas the others all have at least 12GB. Is 4GB enough?

I think it lists the second computer I added as #1.

I got 40 CPUs running SoB the other day, but now I want to switch to the Riesel Project. I've added the Riesel project, but if I deselect the SoB project, will the tests in progress complete? (I don't want to waste what I've done.)

You can set different computers to different "locations" (specifically: "default", Home, Work, School, Sun, Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto) so you can have different settings for different computers/groups of computers. I would set all your i7's to a separate "location", then go into the "Computing Preferences" in the Primegrid website and change "use number of CPU's" to 50% (only for your i7 location). This way you can also have separate "Primegrid preferences" (i.e. which subprojects to run), so if you want to run different tasks on different computers you can.

Alternatively you can physically turn off hyperthreading, I don't know how to do this as I don't actually have any i7's but I believe it's something in the BIOS.

That seems to be true on one of my i7s but not the other. My i5s running four SoB tests are taking about 10 days. One one i7 running eight SoB tests, they are taking 20-23 days (less throughput) but on the other i7 they are taking 14-16 days (more throughput than running four at a time on an i5 but I don't know how it compares to running four on an i7.

Also, I don't see a place to disable hyperthreading.

Also, I don't see a place to disable hyperthreading.

Hint: I5s and i7s aren't directly comparable to each other due to the extra L3 cache. Believe it or not, it helps.

I know it does.

Something strange is going on - an hour or two ago I changed the i7s to use 50% of the CPU. Now there are four tasks running, but the time remaining on them is increasing!

Hint: I5s and i7s aren't directly comparable to each other due to the extra L3 cache. Believe it or not, it helps.

I know it does.

Something strange is going on - an hour or two ago I changed the i7s to use 50% of the CPU. Now there are four tasks running, but the time remaining on them is increasing!

BOINC often gets confused about run-times.

Hint: I5s and i7s aren't directly comparable to each other due to the extra L3 cache. Believe it or not, it helps.

I know it does.

Something strange is going on - an hour or two ago I changed the i7s to use 50% of the CPU. Now there are four tasks running, but the time remaining on them is increasing!

BOINC often gets confused about run-times.

*Cue that SoB result that was throwing statistics off with it's mighty 2.5million hours as cpu run-time.*

I just re-saw the thread the other day, that's why I remembered it.

Setting to use 50% of processors doesn't always work perfectly. If using Windows, it sometimes puts two threads on the same core still. You can work around this somewhat by manually setting affinity for boinc and or SoB tasks. Setting it for boinc will make it apply to new tasks, so any already running also needs to be manually set once. Note this does not persist between restarts.

Setting affinity also provides a small performance increase relative to not doing so, and makes it near enough equal to turning HT off.

The 3.1GHz i5-2400 was doing 0.0063%/minute on SoB.
The 4.0GHz i7-4790K (set to use 50% of CPUs) was doing 0.0093%/minute.

So the i7 was 1.48x the i5, which is about what I expect.

I have it set to suspend until after 1 minute of inactivity

If I set the affinity of BOINC to the even-numbered CPUs, when they start running again, with that assign one task to each CPU?

In LLR tasks, the peak IPC of Haswell over Sandy Bridge is about 50% extra (or 1.5x that of SB). Ram speed is most likely limiting it far below the above. Even dual channel 2400 would be rather limiting.

The percentages on the Manager, Tasks tab are not updated very often. However, one one of my i5s, I've had four SoBs running for 4 days, 22 hours, and about the same number of minutes. All of the exponents are about the same size. However, their progress is 63.2%, 63.1%, 53.9%, and 52.9%.

Why are there such big differences? (The 63.2% and 53.9% are even running the same value of k.)

Does you surf on that PC?
Open and close browser?
Load pages in browser?
All those action "eat" CPU cycles...
Also SoB tasks are huge ones, so they dont fin in L3 cache.. and CPU is oversaturated. THat little difference is multiply with time, and that is also reason of different percentage done per core.
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Might be different FFT sizes.

A great recommendation for controlling affinity, priority and many other settings is Process Lasso. You can set the LLR app to use only physical cores without turning HT off and will remember your settings even after a reboot. Plus much, much more.

Here's link to DL page:
https://bitsum.com/?inproduct

I'd recommend this to most crunchers here at Primegrid because it does so much in optimizing most all systems, not just ones with HT.


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