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Questions and Answers : Preferences : i7 920 Performace-Problem

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ojum-le
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Message 38564 - Posted: 20 Dec 2009, 12:13:51 UTC

Hello, Since 3 Days i have a new CPU and Board and RAM (I7 920, GA-EX58-UD3R, 1x2GB DDR3-1333), Intel-INF: 9.1.1.1020 (Nov 09)
(http://climateapps2.oucs.ox.ac.uk/cpdnboinc/show_host_detail.php?hostid=950024)

Now 1 day is passed with 100% CPU-Time and 8 Threads and i wondered, that my previous System (Q9550, 4GB) had better Performance than the i7.
For Example lets look at the HADSM3-MH Model:
i7: Average sec/TS: ~2,4 (http://climateapps2.oucs.ox.ac.uk/cpdnboinc/result.php?resultid=10526479)

Q9550: Average sec/TS: ~1,1 (http://climateapps2.oucs.ox.ac.uk/cpdnboinc/result.php?resultid=10544168)

That looks a little curious i think.
I Mean The i7 must reach a Average like 1,9 or 2,0?
The Result of this Problem is that i got less credits then the Q9550. Is this Normal?
Look at this User: http://climateapps2.oucs.ox.ac.uk/cpdnboinc/result.php?resultid=10531473
less Drystone and Whetstone performance but better Average sec/TS ?! I am confused.

Could it be that low Memory (2GB) causes this Effect?
Thanks and Happy 4th Advent ! :-)

Profile Iain Inglis
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Message 38565 - Posted: 20 Dec 2009, 13:53:04 UTC

If you are running eight threads on an i7 then is it reasonable to expect each thread to be faster than each core on a Q9550? Hyperthreads are not cores.

You should get more credits in total from the i7 machine than from the Q9550 machine because each i7 core is faster than each Q9550 core and running two hyperthreads on each i7 core gives a further multiple - it used to be about 1.2 (i.e. much less than 2.0).

ojum-le
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Message 38566 - Posted: 20 Dec 2009, 14:29:10 UTC - in response to Message 38565.

If you are running eight threads on an i7 then is it reasonable to expect each thread to be faster than each core on a Q9550? Hyperthreads are not cores.

You should get more credits in total from the i7 machine than from the Q9550 machine because each i7 core is faster than each Q9550 core and running two hyperthreads on each i7 core gives a further multiple - it used to be about 1.2 (i.e. much less than 2.0).


Thats excat my opinion. Is must much less than 2,0 but it isnt.
Next week i try to get another 2GB RAM so i have 4GB.

I\'m cureless.

Profile geophi
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Message 38567 - Posted: 20 Dec 2009, 17:46:30 UTC

I have the same processor and motherboard as you, only 6 GB of RAM running in triple achannel. I am running Linux though, which is faster for hadsm3 type models. I also have a Q9550 in Linux.

Yes, your performance for running the hadsm3mh models is quite slow on the i7.

Running 8 hadsm3mh models, my i7 920 runs each at an average of about .88 s/TS. The Q9550 in Linux will run 4 at an average of .89 s/TS. So, at least with triple channel RAM, the i7 920 should run 8 models in the same time that the Q9550 runs 4.

Multiple things could be happening. If you have only 2 RAM sticks, perhaps they are not placed in the RAM slots to enable Dual Channel mode. Otherwise, if the cooling is not working well, it could be thermal throttling and decreasing performance that way. You could run Everest or Sisoft Sandra to make sure the PC is running at 2.67 GHz, and that your RAM is running dual channel.

Profile geophi
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Message 38568 - Posted: 20 Dec 2009, 20:02:26 UTC
Last modified: 20 Dec 2009, 20:06:50 UTC

Ahh, I reread your first post and there is only one stick of RAM. That would at least explain part of the performance issue. Going to 4 GB when running in dual channel mode should help.

Edit...Also, running quite a few hadam3p models, you are probably running out of memory, so going to 4 GB should also help in that regard.

ojum-le
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Message 38569 - Posted: 20 Dec 2009, 20:45:58 UTC - in response to Message 38568.

Ahh, I reread your first post and there is only one stick of RAM. That would at least explain part of the performance issue. Going to 4 GB when running in dual channel mode should help.

Edit...Also, running quite a few hadam3p models, you are probably running out of memory, so going to 4 GB should also help in that regard.



ok thanks for reply.
next week i\'ll try to get a second ddr3 2gb module. i hope that will help.

bye bye.

ojum-le
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Message 38573 - Posted: 23 Dec 2009, 16:04:56 UTC

Hello,
Now i have placed an another 2GB-Module. Now i have 4 GB in DualChannel-mode.
I must wait for the next first Trickles, but i feel its much faster with 4 as with 2 GB.
Maybe next Year comes an Upgrade to 12GB, but not with the actually RAM-Prices.

So, i can Crunch now :-)

Merry Christmas and New Year to the CPDN Operators and ALL Users.

ojum-le
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Message 38576 - Posted: 23 Dec 2009, 22:42:47 UTC

Hi, PC is runnging fast, but there is another Problem with BOINC.
Since yesterday, my Graph in the Program is some strange:



A Reboot doesnt Help.
As i Upgraded my System, i had complete reinstalled My OS on a formatted Disk.
But With the new installed OS i get NOT a new PC-Number. Its the same like months before with the Q9550.
http://climateapps2.oucs.ox.ac.uk/cpdnboinc/show_host_detail.php?hostid=950024

Same ID only CPU and RAM was changed, maybe the is the Problem?
Today i tryed to join WCG with the Error \"No Work for this Type of computer\", i dont know the original english text, cause i use german Interface.

For the Future: I will never install an OS at a Friday.

Les Bayliss
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Message 38577 - Posted: 24 Dec 2009, 0:08:43 UTC

There are 3 separate \"problems\". But they\'re not really problems.

1) The graph just shows an increase in Total User Credit. It\'s not a problem with the climate models. (Graphs for the models only show on your account page for each of the models that you\'ve worked on.)

2) The way that BOINC identifies a computer has changed a lot in the past year or so. If the ID still shows all of the models for that computer, past and present, then the only problem will be in knowing which processor handled which models.
I don\'t know how to deal with this. Someone else may.

3) The WCG problem can be solved by looking at the WCG web site, and seeing what type of work unit can be processed by which computer(s).
I know nothing about their different types of work, so I can\'t advise.


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Questions and Answers : Preferences : i7 920 Performace-Problem


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