Some WUs much slower (P101xx)

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Some WUs much slower (P101xx)

Postby steveloir » Thu Nov 04, 2010 4:27 pm

I have a NVIDIA GeForce 9500 GT, 2GB running on Windows 7.

It has been happily doing an average of 1300 PPD for many months.
But the last couple of days it has dropped to around 1000 PPD.
I have noticed it seems to be associated with particular Work Units; 10103, 10109 and 10111 so far. In FahMon these WUs are much slower than all the other WUs that have come my way. It may be that my GPU is not very good at these work units.

I recall reading somewhere that the servers work out what a particular client is best at and assigning those WUs, but this may have been my imagination.

Do I just have to live with a batch of slower WUs?
And I will get other ones soon that go a bit faster?
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Re: Some WUs much slower

Postby Zagen30 » Thu Nov 04, 2010 4:56 pm

The 101xx WUs are slower on my hardware as well (GTS 230M and GTX 260), so I assume they're just slower overall.

The servers don't figure out what projects your hardware is best at since, if they did, certain projects which are sub-optimal on almost everyone's hardware wouldn't get done. An example is the 670x SMP projects- they're slower than the other SMP projects on almost every donor's computer, and if only the few computers that aren't negatively hit PPD-wise by them were the only ones crunching those projects, they'd take forever.

WU assignment is mostly random. The WU size setting and the presence/absence of the -advmethods flag can change what work you get to some extent, but there's no way to say "I only want WUs that get me the most PPD" or, more specifically "I only want WUs from specific projects." PPD ebbs and flows over time; the two important things to remember are A) the science needs to be done and it is being done and B) everyone else's PPD will fluctuate as well, so the overall effect of PPD variations is somewhat negligible.
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Re: Some WUs much slower

Postby RAH » Thu Nov 04, 2010 6:30 pm

The newer clients run better on the newer cards. I think its because the differences in the cuda capibilities.
IE: 9600 = cuda 1.0 - GTS 250 = cuda 1.1 - GT 240 = cuda 1.3 - GTS 450 = cuda 2.0
amd such as that.
You just have to go with the flow.
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Re: Some WUs much slower

Postby 7im » Thu Nov 04, 2010 6:38 pm

Slight correction. The Assignment Server does look at what hardware and what client you have, and does WU assignments based on that general profile.

What the AS does next is send the client to a Work Server with WUs matching your profile. Note the WS ususally has a mix of WUs from several projects. And the Work Server does not do any selection, it just hands out WUs. It does not check to see if Work Unit A would run faster than Work Unit B on your particular hardware. The WS simply hands out the next WU in line, regardless of A or B.

The selection process is not that fine grained at this point. So yes, go with the flow. ;)

P.S....
However, if a group of projects is found to be consistently below the expected benchmark, across a wide rage of hardware types, it may be possible to get the benchmark adjusted. However, this is very rare, and the PPD has to be significantly too low. The best thing you can do is report your results (as you did, thank you) and see if others are seeing the same issue with specific projects. It would help to edit your original post, and put the project number in the title. ;)
Edit by Mod: Title changed.
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Re: Some WUs much slower (P101xx)

Postby steveloir » Tue Nov 23, 2010 10:38 pm

After nearly 3 weeks of almost all P101xx WUs, I now seem to be getting some other ones.
And my average PPD is going back up.

Phew!

BTW Thanks for all the replies.
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Re: Some WUs much slower (P101xx)

Postby sswilson » Tue Nov 23, 2010 10:50 pm

Yeah, the 494 point GPU2 WUs seem to offer about 10 - 15% lower PPD across the board (when compared to most other WUs), although it sounds like your card is getting hit for 20%+.

My GTX 275 drops from around 9.6K to around 8.5K PPD so you're not alone.
Currently boincing for Hardware Canucks
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Re: Some WUs much slower (P101xx)

Postby Ravage7779 » Wed Nov 24, 2010 6:47 am

Yup, the 494 pointers are a bear. Almost as bad as those 511 pointers last winter. I lose almost 1800 ppd on my 9800 gt's compared to those tasty 353 pointers. Just have to grin and bear it. The upshot is that they suck for everyone else too, so it all kinda evens out.

Could be worse, you could have one of those midrange fermi based cards trying to fold the monster proteins they just rolled out. Those cards are taking a huge hit.
Get more Mac OS X folding help from the friendly experts @ http://www.foldingathome.org/index.html
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Re: Some WUs much slower (P101xx)

Postby hootis » Tue Dec 07, 2010 7:24 pm

I have just noticed that my Gt 240 is only getting 2.4k ppd as compared to 4.5k with regular wu's but, I'm not getting 101's im getting 11179's almost exclusively for the last few days.
I didn't start a new thread as its some what related
Things yet to materialize.
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Re: Some WUs much slower (P101xx)

Postby steveloir » Tue Mar 15, 2011 5:14 pm

Arrgh! They are back, the dreaded P101xx WUs.
My average PPD sinking fast.

With luck they will only last a week or two...
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Re: Some WUs much slower (P101xx)

Postby steveloir » Mon Mar 28, 2011 9:53 pm

3 Weeks now of exclusively P101xx WUs.

They must end soon - mustn't they?
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Re: Some WUs much slower (P101xx)

Postby HendricksSA » Mon Mar 28, 2011 10:46 pm

Project 101xx has more atoms (1174) than previous GPU 2 work such as 66xx (with 1047). 66xx had more than 105xx (908) and 576x (627). More atoms means the card works harder and takes longer. I'm down about 1000 PPD per 9800GT as well. I don't even remember the last time I folded anything but 101xx. GPU2 has gone the way of GPU3 with ever larger projects. These are the work units putting nVidia 8400 and 8600 cards out of a job. But I'm happy - I just fold what they give me!
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Re: Some WUs much slower (P101xx)

Postby steveloir » Tue Mar 29, 2011 8:28 am

Hi HendricksSA,
Of course the main purpose is to get the folding done. But sadly the points system brings out a my competitive streak. I want to get lots and lots of points!
I shall now calm down and feel proud that I am a contributor to essential science.
Thanks.
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Re: Some WUs much slower (P101xx)

Postby steveloir » Tue May 24, 2011 2:09 pm

I recently had about 12 days with a variety of work units and my PPD went up.
But now I am back to all P101xx again and down has gone my PPD.
Rather boring and has completely killed my competitive side which maybe is good for my character!

But maybe not so good for Folding@Home as there is no point in keeping my computer running 24 hours.

Steve
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Re: Some WUs much slower (P101xx)

Postby Grandpa_01 » Tue May 24, 2011 3:56 pm

steveloir wrote:I recently had about 12 days with a variety of work units and my PPD went up.
But now I am back to all P101xx again and down has gone my PPD.
Rather boring and has completely killed my competitive side which maybe is good for my character!

But maybe not so good for Folding@Home as there is no point in keeping my computer running 24 hours.

Steve


Other than your competitive side which will tell your your computer is not running so you are losing even more points by shutting it down. :wink: Been there done that. :lol:
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2 - SM H8QGi-F AMD 6xxx=112 cores @ 3.2 & 3.9Ghz
5 - SM X9QRI-f+ Intel 4650 = 320 cores @ 3.15Ghz
2 - I7 980X 4.4Ghz 2-GTX680
1 - 2700k 4.4Ghz GTX680
Total = 464 cores folding
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Re: Some WUs much slower (P101xx)

Postby 7im » Tue May 24, 2011 4:47 pm

steveloir wrote:I recently had about 12 days with a variety of work units and my PPD went up.
But now I am back to all P101xx again and down has gone my PPD.
Rather boring and has completely killed my competitive side which maybe is good for my character!

But maybe not so good for Folding@Home as there is no point in keeping my computer running 24 hours.

Steve



One should try to learn how the competition works before one gets upset about varying results. You wouldn't drag race your car if you didn't know the rules first, would you?

But if learning about how fah works is not what you want to do, that's okay. And we'll thank you for your contribution and wish you the best on whatever you decide to do.
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