S5R5 Performance Analysis

Richard Haselgrove
Richard Haselgrove
Joined: 10 Dec 05
Posts: 2143
Credit: 2977164365
RAC: 776955

Could it be memory bus

Could it be memory bus contention?

I see similar effects on my 8-core dual Xeon Dell Precision workstation when all 8 cores are working on identical SETI tasks.

paul milton
paul milton
Joined: 16 Sep 05
Posts: 329
Credit: 35825044
RAC: 0

about the lost cycles, tell

Message 90074 in response to message 90072

about the lost cycles, tell me about it, for some reason explorer.exe eats up 25-75% of the cpu for about 10 secconds every minute or so, no idea why. and sadly i lost the recovery cd's for this pavilion when we moved a few months back so no fresh installs for me :(

seeing without seeing is something the blind learn to do, and seeing beyond vision can be a gift.

RandyC
RandyC
Joined: 18 Jan 05
Posts: 6680
Credit: 111139797
RAC: 0

RE: about the lost cycles,

Message 90075 in response to message 90074

Quote:
about the lost cycles, tell me about it, for some reason explorer.exe eats up 25-75% of the cpu for about 10 secconds every minute or so, no idea why. and sadly i lost the recovery cd's for this pavilion when we moved a few months back so no fresh installs for me :(

It's possible it might be scanning for a (lost?) network drive.

Go into Tools->Folder Options->View and uncheck the box for "Automatically search for network folders and printers".

Seti Classic Final Total: 11446 WU.

paul milton
paul milton
Joined: 16 Sep 05
Posts: 329
Credit: 35825044
RAC: 0

RE: RE: about the lost

Message 90076 in response to message 90075

Quote:
Quote:
about the lost cycles, tell me about it, for some reason explorer.exe eats up 25-75% of the cpu for about 10 secconds every minute or so, no idea why. and sadly i lost the recovery cd's for this pavilion when we moved a few months back so no fresh installs for me :(

It's possible it might be scanning for a (lost?) network drive.

Go into Tools->Folder Options->View and uncheck the box for "Automatically search for network folders and printers".

thank you, but no. i uncheckd it and it still does it.

seeing without seeing is something the blind learn to do, and seeing beyond vision can be a gift.

RandyC
RandyC
Joined: 18 Jan 05
Posts: 6680
Credit: 111139797
RAC: 0

RE: RE: RE: about the

Message 90077 in response to message 90076

Quote:
Quote:
Quote:
about the lost cycles, tell me about it, for some reason explorer.exe eats up 25-75% of the cpu for about 10 secconds every minute or so, no idea why. and sadly i lost the recovery cd's for this pavilion when we moved a few months back so no fresh installs for me :(

It's possible it might be scanning for a (lost?) network drive.

Go into Tools->Folder Options->View and uncheck the box for "Automatically search for network folders and printers".

thank you, but no. i uncheckd it and it still does it.

Are any of your partitions formatted as NTFS? If so, do you have Fast-indexing turned on? Constant scanning of the disk indexes could cause this, especially if it's the drive that BOINC is installed on (very frequent updates...).

Right-click on the drive in explorer, select properties. Check box is at the bottom labeled "Allow Indexing Service to index this disk for fast file searching".

Seti Classic Final Total: 11446 WU.

Elphidieus
Elphidieus
Joined: 20 Feb 05
Posts: 245
Credit: 20603702
RAC: 0

RE: Could it be memory bus

Message 90078 in response to message 90073

Quote:

Could it be memory bus contention?

I see similar effects on my 8-core dual Xeon Dell Precision workstation when all 8 cores are working on identical SETI tasks.

I see your point. I did some crunching on both 7 and 8 instances and with my own calculations, they both yield almost the same RAC per day. Though with the varying results, comparing WUs with a similarly awarded credit, crunching on 7 cores instead of 8 reduces crunching time of over 40 minutes per WU.

I don't see that adding more memory will solve the problem, since I'm already at 6GB.

Richard Haselgrove
Richard Haselgrove
Joined: 10 Dec 05
Posts: 2143
Credit: 2977164365
RAC: 776955

RE: RE: Could it be

Message 90079 in response to message 90078

Quote:
Quote:

Could it be memory bus contention?

I see similar effects on my 8-core dual Xeon Dell Precision workstation when all 8 cores are working on identical SETI tasks.

I see your point. I did some crunching on both 7 and 8 instances and with my own calculations, they both yield almost the same RAC per day. Though with the varying results, comparing WUs with a similarly awarded credit, crunching on 7 cores instead of 8 reduces crunching time of over 40 minutes per WU.

I don't see that adding more memory will solve the problem, since I'm already at 6GB.


6GB? When I was trying to tune up my system when I first got it, the Core2 MP architecture was still very new: one of the things that people were starting to find out and write up was that the FBDIMM architecture works best with sets of 4 identical DIMMs for each memory channel. If you have 4 x 1GB in one set of slots, and 4 x 512 MB in another set (and you've checked the manual to see whether your sets are 1,2,3,4 or 1,3,5,7), you're probably running as fast as you can - but if you've got anything out of balance, memory access will be slow.

Elphidieus
Elphidieus
Joined: 20 Feb 05
Posts: 245
Credit: 20603702
RAC: 0

Previously I had a 4x1GB

Message 90080 in response to message 90079

Previously I had a 4x1GB configuration, but that was before my workload which requires additional memory, and before Einstein switched to R5. My present configuration is 2x2GB and 2x1GB. I'll try again with 4x1GB now that my workload is gone, and I'll place order for additional 2x2GB in the near future when RAM price drops further. Right now RAM prices are increasing steadily.

Richard Haselgrove
Richard Haselgrove
Joined: 10 Dec 05
Posts: 2143
Credit: 2977164365
RAC: 776955

RE: Previously I had a

Message 90081 in response to message 90080

Quote:
Previously I had a 4x1GB configuration, but that was before my workload which requires additional memory, and before Einstein switched to R5. My present configuration is 2x2GB and 2x1GB. I'll try again with 4x1GB now that my workload is gone, and I'll place order for additional 2x2GB in the near future when RAM price drops further. Right now RAM prices are increasing steadily.


My Dell BIOS showed 'Quad channel mode' when I got the mixture right.

Robert
Robert
Joined: 5 Nov 05
Posts: 47
Credit: 324019053
RAC: 23753

RE: It baffles me to see my

Message 90082 in response to message 90070

Quote:

It baffles me to see my 3.0GHz Xeon underperformed by a huge margin compared to a 2.66GHz Core 2 Duo, both on a Mac platform.

WorkUnit ID 47744130

Make sure Speed Step is disabled in the BIOS

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