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Dual PIIIs have slowed my times way down!

C

conjur

No Lifer
Well, I have the dual PIII 1.0 machine running and the dual PIII 933 (these are in a Gateway 7400 and a 6400, respectively).

However, the times have jumped from sub-7 hr nearly 9 hrs on one (the PIII 933):

after
2002 Mar 13 03:32am 20.773,9.34 0.864 homer.works.lit 8:21
2002 Mar 13 03:12am 9.894,11.17 0.54 homer.works.lit 8:41

2002 Mar 13 04:14am 15.535,11.33 0.013 SHAKESPEARE 9:02
2002 Mar 13 03:47am 10.351,10.95 0.537 SHAKESPEARE 7:51

before
2002 Mar 12 09:52am 21.314,10.99 1.317 homer.works.lit 6:14
2002 Mar 12 03:37am 21.44,13.96 0.465 homer.works.lit 7:11
2002 Mar 11 02:12pm 4.568,8.15 0.725 homer.works.lit 7:01

2002 Mar 12 11:55am 3.699,15.02 0.434 SHAKESPEARE 6:42
2002 Mar 12 05:13am 0.278,13.45 3.735 SHAKESPEARE 5:46
2002 Mar 11 05:42pm 4.456,8.25 0.717 SHAKESPEARE 6:36


I know the WUs are all over the place but there's a definite trend to slowing down...seems to be too much to me or is this normal??


BTW, GO CARDS!!! Woo hoo!! Beat Princeton last night (in a game that became too close 🙂 )
 
Actually those times look good to me.

When I went from a single PIII/800 to dual PIII/860s my wu time jumped from an average of ~8.5 hrs per to an average of ~10.25hrs per wu. It was explained to me that it was due to sharing the memory bandwidth.

For me it was kind of a disappointment as I was hoping to actually double my output. 🙁

I did go from an average of 2.7 per day to 4.7 so that is a decent increase anyway.

R😛b
 
An alternative is to run 1 instance of SETI and one instance of a low memory bandwidth project (DNET used to work well in that situation... practically no memory bandwidth at all used). Then, the SETI client will get the bandwidth it needs and your other processor is still doing useful work...

JHutch
 
The only way to get the same times running dual as singly, is to run Xeons. Otherwise, there's alot of "slow" RAM contention going on because the PIIIs have a small cache when compared to say a Xeon 1MB and SETI needs that cache.
 
I've experienced the nasty slowdown on my Dual Celeron 400, even worse, 128k L2 cache, 66MHz RAM (i believe...off to check that on Abit's webby!), went from 13hrs on single 500 to 22hrs with dual 400s! :Q

Anyway, got some AS2 now, and just put it on the CPUs and north bridge, and at 552 (92*6) at the moment and touch wood *ConfusedBW taps his head* it's running OK 🙂

You watch, now i've said that the darn thing will probably crash, just to spite me! :Q

Poof, any chance of fitting these "Xeon" things in my Abit BP6 😉

ConfusedBW
 
Would, say, a PIII 733 Xeon fit an FCPGA slot in a Gateway Server?

OR...would, say, a PIII 1.13GHz with 512KB cache be better (would be double the cache size)
 
From my experience a 512 KB cache-cpu, p2 or p3, gets around 10% smp-penalty in seti.
Tyan Tiger 2460 + amd-mp gets somethere between 5 and 10% smp-penalty in seti.

With only 256 KB cache or less, you've first get nearly 20% penalty for single-cpu, and 20% smp-penalty added on top.
Compared to a 512 KB cache-machine with 2 cpu's, you needs a system that's 30% faster to equal the output...
 
From 2.7 WU per day up to 4.7 WU per day is a good jump and that's what you are looking for when adding a second cpu is more WU per day.

You won't get double the wu's per day because of the memory contention but a 74% increase in WU's per day isn't shabby especially when you look up the money it costs for the faster xeons, motherboards etc...

Be sure you have assigned a seti process to each cpu, this made a big difference in WU times when I ran it on my dual system.
 
Another thing to point out is that with the dual system, you're not feeding two power supplies, nor are you having to duplicate components as you would with two individual systems - some points to factor in when comparing dual and single cpu performance/cost.

BTW, I only have two dual Intel systems left here.. fortunately, one is a dual Xeon. 😀 Now as for dual AMD systems, that's another story. 😉

 
Well...maybe I'll swap them all (the PIIIs) for the 1.13GHz with the 512KB cache...be a while longer...then just eBay (or sell up here) the original CPUs
 
Are the 1.13's you are talking about tualitins? Does your mobo support tualitins?

Are your 1.0 ghz chips the 100 fsb or the 133 fsb variety? fcpga or slot1?

Just asking because if you swap to the 1.13's and want to sell your old chips I'm sure there will be some takers.
I myself wouldn't mind getting my hands on a fcpga 1ghz 100fsb PIII and then seeing how high I can OC it.
Some have got 1.45ghz air cooled out of those chips.
 
To be honest...not sure if it supports the Tualatin or not. These are Gateway 6400 servers and I believe it's a ServerWorks board. Doesn't appear to offer any type of o/c (but, these are servers, right? 😉 )

It's an FC-PGA socket and they are 133 FSB
 
The Gateway boards using the serverworks chipsets are Asus cur-dls ( I have two of them) and your hit is just about right. I have a 2 x p3-1000 and 2 x p3-700@933. I recently found an Iwill dvd266r dual that uses DDR memory and my times got a good boost, but it is still not the same a two standalone machines. I am selling off my duals and going with epox 8kha+ except for one server I am keeping as a game server.

BTW...they dont support talutions.
 

i have a couple of the dual 760mpx amd systems
running dual MP 1800+. they average bout
5hr 24 min when running 2 seti's at the same time.

i am pretty happy with those speeds. i thought it
was going to be slower than that.
 
Thanks, cakin.

Glad I didn't buy the CPUs yet 🙂

Guess I'm just getting spoiled and wanting more...more...more!!

I should be pretty happy with what I have. When I joined the team back in Dec. (and brought along 180WUs or so) I was barely clearing 10 WUs/day and now I'll be consistently around 50 or more...not too shabby for, basically, a one-man show 🙂
 


<< i have a couple of the dual 760mpx amd systems
running dual MP 1800+. they average bout
5hr 24 min when running 2 seti's at the same time.

i am pretty happy with those speeds. i thought it
was going to be slower than that. >>



That doesn't seem right, cory. My dual AMD is the ASUS A7M266-D (760MPX) and it's two XP1800+ chips o/c to 2000+ (via FSB to 145) and I'm about 3:45 on average with DDR RAM at 2-3-2. Those MP 1800+ chips should be better performers so unless you're doing a lot of work on that machine, those times seem rather slow.

Heck, I get just over 5:00 hrs on my laptop which is a Dell Inspiron 8100 with PIII 1.0-M and 384MB of PC133 RAM.
 
i am not overclocking these machines.
and they are running openunix 8.0.
i want stability.

yes i do check in here from time to time. just have not been posting
much. been pretty busy.

i am really interested in seeing how well these dual athlons setups
do with the adaptec 4 channel raid cards in 64 bit 66 mhz pci slots
with 256 meg ram on the scsi card plus 2 gig ram on the motherboard.
have 4 15,000 rpm drives that i am going to raid 1+0
each of the drives can read around 60 meg a second. times
4 that should be 240 megabytes a second on the reads.
along with 6 other 10,000 rpm drives raid 1
to store the os and imaging files

i did that tivo hack to 3 machines. it was pretty funny at the computer
store when i bought 5 160 gig ide drives. they asked if i was going to
raid them. i said nope they are going into tivo boxes.
my directv tivo box can now store over 250 hours of video
(has 2 160 gig drives)
 

yea 250 hours is pretty nice. but i wish there was an ethernet
connection that would then let me connect it to other rooms.
i am sure they will be adding it.

what would really be cool is if you could have several tivo boxes.
each could record but they could be networked together
so as a group they would decide what to record.
and then play it back from a remote tivo.
i bet they will be adding things like this in the future. i do know
of a couple of companies that have products like this. saw one
that would even do wireless video to windows ce/ palm devices
streaming a live show.

the over the air tivos can be hacked with a ne2000 card and
then played on a pc accross the network.

 
It would be nice if they would run across a network, but wouldn't 1 TIVO pretty much take up a 100 Mbps network with all the bandwidth the video would use?
 
i know hdtv is about 1.6 megabytes a second (depending on content).
that is what i have seen when i record from my HDTV tuner card.
i think it used about 10 gig an hour.
think about this, there are USB TV tuners that have
to run on a 12 megabit bandwith.
and thats without good compression.
i am guessing that the tivo is around 500k to 1 megabyte a second.
so you should be able to run several over a 100base t network.
and i hear that some people do plug ne2000's into the over the air
tivos and play video thru that.

think about this with one hard drive tivo can record 2 live shows
while playing a recording. and that is on a 5400 rpm drive.
 
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