UK BOINC Team Forum

The long task for SRBase is showing as completion in 1+ days..

So far based on 10%, if it runs to 100%, I would calculate it is going to take around 10 hours.

Also I just spotted this post which says SRBase will utilise which ever AVX instruction set you have, including AVX2! (finally).

http://srbase.my-firewall.org/sr5/forum ... d=771#3362

So I am guessing that non AVX2 (eg AVX) chips will run the long task much slower?

Same here Chris.

The current "long3" tasks on my 4790 show 23 hours to completion. Past results have taken about 14 hours so the time displayed in Boinc Manager isn't that accurate.

I haven't finished any "long" tasks on a Xeon yet but my 4790 @ 3.6GHz and AVX2 takes ~16 minutes for one of the SR-Short tasks while my 2670 @ 2.6GHz and AVX takes ~33 minutes.

Allowing for the clock difference, about a 50% improvement for AVX2 over plain old AVX.

I don't have any non AVX hosts so I can't check that.

Mark

Thanks Mark.

I forgot to mention, I ran SRBase on my i7's with the stock Intel CPU cooler and within the hour they overheated; I had to swap over to a Hyper 103 which got it back from 88c to 65c. This what I have read about AVX/AVX2, they do much better processing but use far more electricity and produce more heat. Even TDP has gone up from around 80w to 100w (via CoreTemp).

Another thing I read about AVX2 on Xeons is the CPU slows itself down; I can confirm this as my V4 has slowed all core frequency from 2.8 Ghz to 2.6 Ghz.

Perhaps we can compare completed long tasks on V1 2670 vs V4 2696 to see just how much better the AVX2 really is, noting that your 2670's are running at around 2.9 Ghz where as mine is running at 2.6 Ghz. It will be interesting to see what if any improvements are.

Hi Chris

I have some long2 0.20 SRBase tasks running at the moment, on my i7 3820 (Sandy Bridge-E) octo-core CPU running at 3.6GHz.

Temps are between 77-83 deg C, and I'm using a Noctua Cooler (fan type, not water cooled) so it's a bit inefficient.

So far, all 6 tasks running at present are about 75% complete after approx 21 hours.

I think my 3820 CPU is AVX and not AVX2 !!

regards
Tim

Hi Chris,

I didn't mention it this time but I have frequently in the past, CPUs get VERY hot running SRBase tasks!

XEONs do underclock by a few hundred MHz when running AVX instructions, I believe it's something to do with the internal timing of partial results of operations. Usually not a significant amount.

Once any of my 2670s finish a task, I'll let you know

Mark

Hi Tim,

It's certainly getting a little toasty here as well

(Yes, the 3820 is only AVX same as my XEONs)

Off to the cinema now, incommunicado for a few hours as they don't like you using your 'phone while the film's on

Mark

Thank you Tim & Mark,

I just did a quick check and it would seem that Haswell/Broadwell Xeons and Intel core all have AVX2 whereas Sandy Bridge does not and only has AVX.

It will be an interesting comparison:

The (Haswell/Broadwell) i7 4790 + 2696v4 vs the (Sandy Bridge) i7 3820 + 2670v1

AVX2 vs AVX

Anyone got the missing figures?

Sierpinski / Riesel Base (8 credits)
Sierpinski / Riesel Base - average (? credits)
Sierpinski / Riesel Base - average2 (? credits)
Sierpinski / Riesel Base - average3 (? credits)
Sierpinski / Riesel Base - long (? credits)
Sierpinski / Riesel Base - long2 (? credits)
Sierpinski / Riesel Base - long3 (? credits)
Sierpinski / Riesel Base - short (? credits)
Sierpinski Base (6 credits)
Sierpinski Base - short (16-36 credits)

Seem's there are a few different short, average, and long tasks:

I have...

Riesel base - 18
R base short - 24
SR base average2 - 300
SR base average3 - 350
SR base long3 - 2050
SR base short - 35
S base - 6
S base short - 8 or 35

Still a couple of gaps

Chris.

Hi Chris

I can add the following:

Sierpinski / Riesel Base - short (35 credits)
Sierpinski Base - short (35 credits each)
Riesel Base - short v0.20 (24 credits each)

regards
Tim

Thanks guys.

Does the update below look right? Just a few more left!

Well the good news is that I have over 100K of Long3 currently processing.

CREDIT FOR SR BASE TASKS

Riesel Base (18 credits)
Riesel Base - short (24 credits)
Sierpinski / Riesel Base (18 credits)
Sierpinski / Riesel Base - average (? credits)
Sierpinski / Riesel Base - average2 (300 credits)
Sierpinski / Riesel Base - average3 (350 credits)
Sierpinski / Riesel Base - long (? credits)
Sierpinski / Riesel Base - long2 (? credits)
Sierpinski / Riesel Base - long3 (2050 credits)
Sierpinski / Riesel Base - short (35 credits)
Sierpinski Base (6 credits)
Sierpinski Base - short (8-36 credits)

RUNTIMES FOR LONG3, LONG2, LONG, & AVERAGE3:

SRB Long3

(NONE)

SRB Long2

21+ hours / 3.6 GHz I7-3820

SRB Long

(NONE)

SRB Average3:

4 hours / 2.6 GHz E5-2696V4

Seems a shame to spoil all your hard work but the credits and run times change for each sub-project depending on where we are through the sequence

Check the science section of the message boards to see what's currently being provided.

Mark

Sorry Chris

I've got SR Base at 8 points not 18 and S short at 8/16 or 35 not 36?

For what it's worth, at the moment I'm getting:

Run times for i7-4790 (AVX2)
R base - 6 to 9 minutes
R base short - 9.5 minutes
SR base - 2 to 5 minutes
SR base long3 - 13 hours 45 minutes
SR short - 16 minutes
S base - 4 minutes
S short - 2.5 minutes (8 credits) / 4.5 (16) / 16.5 (35)

Run times for E5-2670 (AVX)
R base - 12 minutes
R short - 16 minutes
SR average2 - 3.5 hours
SR short 33 minutes (35 credits)

Mark

Just a thought but it may be worth suspending any SRBase tasks from being reported just in case it's the sprint project? They can always be uploaded after the sprint is known if not but it may mean the difference between a one day boost and a two day one?

Mark

Yeah I think that sounds like a good plan.

Hi all

I recently was given some of these tasks:

Sierpinski / Riesel Base - average2 - but unlike other tasks, I'm getting 700 credits for each one (on my i7 CPU). They are however, taking quite a long time - 25,000-29,000 seconds - about 7+ hours.

And they seem to "hang" at between 99% and 100% for ages too...at least an hour or two

The Estimated time (to completion) is a long way out as well...BOINC Manager quotes 18 minutes for each one, not 7+ hours

regards
Tim

Hi

I had a similar couple a week or so ago - same as you. I aborted them after 18 hours. Someone else did 1 later in 2.3 hours, the other was done eventually in 21.5 hours.
No idea why one finished so fast by someone else.

Mike

UBT - Mikee wrote:Hi

I had a similar couple a week or so ago - same as you. I aborted them after 18 hours. Someone else did 1 later in 2.3 hours, the other was done eventually in 21.5 hours.
No idea why one finished so fast by someone else.

Mike

HI Mike,

I was a bit more patient and let them run to completion...in the end they all earned credits and at a higher rate than if I have been crunching the smaller, faster SRBase tasks

I still have 13 in my cache, so with luck they will finish just before the next Sprint starts (in about 5 hours time )

regards
Tim

I think if they are anything like PrimeGrid, and it is my understanding that some WU are also looking for certain primes, and they come across something looking good then it takes much much longer.

Like Tim said, as you get more credits in the long run then its actually good thing.