Oh Brother, What betid to mine Haswell 4770? - Page 4

petrw1 · 2014-10-03, 21:40

Quote:

Originally Posted by Mark Rose

Actually, there's a very simple way to tell: open the case and count the memory sticks. If you only one stick it's single channel. If there are two sticks immediately beside each other (no empty slots), it's dual channel.

I do know it only has 4G of RAM.

It would not surprise me a lot if there was only one 4G stick.

Mark Rose · 2014-10-03, 21:53

Quote:

Originally Posted by petrw1

I do know it only has 4G of RAM.

It would not surprise me a lot if there was only one 4G stick.

That does seem low for a new machine.

kladner · 2014-10-03, 21:58

Quote:

Originally Posted by Mark Rose

That does seem low for a new machine.

IIRC, that is what the non-profit I work for is getting for the new Dell compact i5 desktops they've been ordering. A single DIMM would not surprise me, as 2 GB sticks are likely less cost effective than one 4 GB.

petrw1 · 2014-10-03, 22:58

So if I were to assume it has one 4G stick it will almost certainly be memory bound....and not be able to perform anywhere near its potential.

Should I:
- only run 2 workers; one on 1 of the first 4 logical cores and 1 on the second set?
- run 2 workers but let them each have 4 logical cores?
- run 4 workers and let them fight it out knowing they will be slow but still produce more overall thru-put than 2 workers?

kracker · 2014-10-04, 00:42

Quote:

Originally Posted by petrw1

So if I were to assume it has one 4G stick it will almost certainly be memory bound....and not be able to perform anywhere near its potential.

Should I:
- only run 2 workers; one on 1 of the first 4 logical cores and 1 on the second set?
- run 2 workers but let them each have 4 logical cores?
- run 4 workers and let them fight it out knowing they will be slow but still produce more overall thru-put than 2 workers?

I have two 2400 MHz dual-channel memory.. still bottlenecked.

Prime95 · 2014-10-04, 01:56

Quote:

Originally Posted by petrw1

So if I were to assume it has one 4G stick it will almost certainly be memory bound....and not be able to perform anywhere near its potential.

Should I:
- only run 2 workers; one on 1 of the first 4 logical cores and 1 on the second set?
- run 2 workers but let them each have 4 logical cores?
- run 4 workers and let them fight it out knowing they will be slow but still produce more overall thru-put than 2 workers?

Since we haven't ruled out thermal throttling, fewer workers is probably best. And since you probably have half the memory bandwidth of most Haswells, you are unlikely to see much gain from more than two workers. Thus, I'd run two workers and letting the OS figure out which logical CPUs to use may be best.

Sad.

axn · 2014-10-04, 03:31

Quote:

Originally Posted by petrw1

In fact in general I cannot even install extra software; at least nothing that requires any kind of Admin authority... i.e. nothing like CoreTemp or CPU-Z.

CPU-Z has non-install version. Just download and run. However, while running, it may ask for admin clearance. Can you try it out?

pinhodecarlos · 2014-10-04, 16:38

Can you open the PC case and clean up the dust of the cooler?

petrw1 · 2014-10-04, 21:31

Quote:

Originally Posted by pinhodecarlos

Can you open the PC case and clean up the dust of the cooler?

PC is only a couple months old.
No need to dust yet unless ... wink wink ... good opportunity to inspect what is there.

petrw1 · 2014-10-06, 22:20

Per iteration time almost exactly DOUBLED from when 2 workers were doing LL and 2 were doing TF.

I'm going to see what happens when I stop workers #1 and #3.
Will #2 and #4 drop by half again ... or even more....

I'm am going to guess about the same and in the end I will be running TF on 2 workers and LL on the other 2.

Tune in tomorrow: Same Bat Time Same Bat Channel

VBCurtis · 2014-10-07, 02:35

If all 4 doing TF is slower per worker than 2 doing TF, you have a heat problem- probably a misaligned heatsink, maybe a non-functioning CPU fan. Testing all TF removes the memory bottleneck, I believe.

Two LLs could saturate single-stick memory throughput, but I would think TF's lighter memory use would allow LL to much-less-than-double when you add two TFs to 2 LLs; so I think you have a serious heat problem, rather than just a memory bottleneck.

2014-10-06, 22:20	#43
petrw1 1976 Toyota Corona years forever! "Wayne" Nov 2006 Saskatchewan, Canada 1001001010100₂ Posts	Well with 4 workers doing LL .... IT REALLY SUCKS Per iteration time almost exactly DOUBLED from when 2 workers were doing LL and 2 were doing TF. I'm going to see what happens when I stop workers #1 and #3. Will #2 and #4 drop by half again ... or even more.... I'm am going to guess about the same and in the end I will be running TF on 2 workers and LL on the other 2. Tune in tomorrow: Same Bat Time Same Bat Channel

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2014-10-03, 22:58	#37
petrw1 1976 Toyota Corona years forever! "Wayne" Nov 2006 Saskatchewan, Canada 2²·3·17·23 Posts	So if I were to assume it has one 4G stick it will almost certainly be memory bound....and not be able to perform anywhere near its potential. Should I: - only run 2 workers; one on 1 of the first 4 logical cores and 1 on the second set? - run 2 workers but let them each have 4 logical cores? - run 4 workers and let them fight it out knowing they will be slow but still produce more overall thru-put than 2 workers?

2014-10-04, 16:38	#41
pinhodecarlos "Carlos Pinho" Oct 2011 Milton Keynes, UK 3·17·97 Posts	Can you open the PC case and clean up the dust of the cooler?

2014-10-07, 02:35	#44
VBCurtis "Curtis" Feb 2005 Riverside, CA 2²×1,217 Posts	If all 4 doing TF is slower per worker than 2 doing TF, you have a heat problem- probably a misaligned heatsink, maybe a non-functioning CPU fan. Testing all TF removes the memory bottleneck, I believe. Two LLs could saturate single-stick memory throughput, but I would think TF's lighter memory use would allow LL to much-less-than-double when you add two TFs to 2 LLs; so I think you have a serious heat problem, rather than just a memory bottleneck.