Too long time to work ... ???

Joël Harismendy · 2005-05-08, 22:27

Hello, I am french and I think my computer is not working with good options ... and it works no fast !

I am with windows xp sp2
AMD SEMPRON (TM) 3000+ (1,99 ghz)
1 Go RAM
I am with 23.8.1 Mersenne test version of software

to go faster and I have tried to modify cpu options :
24 h per day work
128 MB daytime (10:00 to 20:00)
256 MB nighttime

On cpu settings and information I have :
cpu information
AMD Sempron (TM) 3000+
cpu speed : 1988,62 MHz
cpu features ; rdtsc, cmov,prefetch,mmx,sse
L1 cache size : 64 kb
L2 cache size : 512 kb

But no change ... it seems to be not fast ...

Exemple I have actually :
iteration 2110000/26510879 per iteration time 0.144 sec

Is it normal speed ? What can do to go faster ?

Merci

J.Harismendy

Mystwalker · 2005-05-08, 22:57

I'm not totally sure for the iteration time, but if at all, it should be <20% slower than what one might expect.

There is a newer version available that improves performance, but I don't know about its status - whether it is still beta or already granted for general use. Maybe someone else can provide more information on this particular topic?

De rien!
Dennis

dsouza123 · 2005-05-09, 02:27

Version 24.11 can be downloaded from
ftp://mersenne.org/gimps/
the file p95v2411.zip contains Prime95.exe version 24.11
it may give a few percent increase in speed.

For the exponent posted above with an iteration time of 0.144
it will take 44.18 days, if run 24/7.
For every 0.001 reduction in iteration time it saves about 3/10 of a day.

Joël Harismendy · 2005-05-09, 05:03

And How can I do with my Job started ?
May I install this new version now during my work ?
What can I do to install the new version and not loose the actuel work ?
Thx
JH

sdbardwick · 2005-05-09, 05:21

It is very easy to use 24.11 without losing any work; only an updated .exe file is required, not a new install.
1. Stop and exit Prime95 from the File menu.
2. Locate your Prime95 directory (usually ../Program Files/Prime95/)and rename Prime95.exe to Prime95.old
3. Download p95v2411.zip from the above link.
4. Extract Prime95.exe from the .zip to the Prime95 directory you found in step 2
5. Double click on Prime95.exe and it will pick up where version 23.8 left off, using all of the 23.8 settings.

Mystwalker · 2005-05-09, 10:49

I'd also backup the cache file of the test - just in case a serious bug is detected in 24.11. Unlikely, but it only takes 2 seconds to be on the sure side...

nngs · 2005-05-09, 16:28

seems too slow for a computer marked by 3000+. Can a combination of good cpu and very poor motherboard/mem slow down a machine so much? My p4 1.5G is 0.124s per 10k when working on ~27M exponents, even with SDram 133.

I heard that using shared video memory could slow down prime95.

Another thing worth to check is that there might be some unexpected (might malicious) programs hidding in memory and eating up your cycles. Turn off the prime95 (and all other app), and Ctrl+Alt+Del to see the cpu usage which should be under 1%. If not, then it's a sign of cycle stealing.

I use Zonelab Zonealarm as my firewall on windows machines, which generally take up only 1-2% of total cpu power (P4 1.5G)

Mystwalker · 2005-05-09, 16:58

Prime95 is heavily SSE2-optimized, and at least the socket A Semprons don't have SSE2:
http://www.amd.com/us-en/Processors/..._11604,00.html

Joël Harismendy · 2005-05-09, 22:08

So ? What can I do to go faster ?
Nothing ?
Merci

sdbardwick · 2005-05-10, 01:26

On 32 bit AMD processors, updating from version 23.x to 24.6 decreases iteration times by 15% to 33%, depending on FFT size.

24.11 was oriented towards 64 bit AMD processors; sorry if we misled you earlier.

My Athlon MP 1900+ (1600 MHz) running 24.6 has about the same iteration time as your 2000 MHz Sempron running 23.8.

24.6 installs the same way as I outlined for 24.11. Substitute p95v246.zip for p95v2411.zip.

Joël Harismendy · 2005-05-10, 05:30

My monitor is Sonic of 19 ' and with 24.11 version I have 0.119 sec per itération ! It is not speed !
I regret this speed and I don't see what to do !
@+ JH

2005-05-08, 22:27	#1
Joël Harismendy Aug 2004 France (Aquitaine) 1110₂ Posts	Too long time to work ... ??? Hello, I am french and I think my computer is not working with good options ... and it works no fast ! I am with windows xp sp2 AMD SEMPRON (TM) 3000+ (1,99 ghz) 1 Go RAM I am with 23.8.1 Mersenne test version of software to go faster and I have tried to modify cpu options : 24 h per day work 128 MB daytime (10:00 to 20:00) 256 MB nighttime On cpu settings and information I have : cpu information AMD Sempron (TM) 3000+ cpu speed : 1988,62 MHz cpu features ; rdtsc, cmov,prefetch,mmx,sse L1 cache size : 64 kb L2 cache size : 512 kb But no change ... it seems to be not fast ... Exemple I have actually : iteration 2110000/26510879 per iteration time 0.144 sec Is it normal speed ? What can do to go faster ? Merci J.Harismendy

2005-05-09, 16:28	#7
nngs Jun 2004 2²×3×5 Posts	seems too slow for a computer marked by 3000+. Can a combination of good cpu and very poor motherboard/mem slow down a machine so much? My p4 1.5G is 0.124s per 10k when working on ~27M exponents, even with SDram 133. I heard that using shared video memory could slow down prime95. Another thing worth to check is that there might be some unexpected (might malicious) programs hidding in memory and eating up your cycles. Turn off the prime95 (and all other app), and Ctrl+Alt+Del to see the cpu usage which should be under 1%. If not, then it's a sign of cycle stealing. I use Zonelab Zonealarm as my firewall on windows machines, which generally take up only 1-2% of total cpu power (P4 1.5G) Last fiddled with by nngs on 2005-05-09 at 16:38

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2005-05-08, 22:57	#2
Mystwalker Jul 2004 Potsdam, Germany 3·277 Posts	I'm not totally sure for the iteration time, but if at all, it should be <20% slower than what one might expect. There is a newer version available that improves performance, but I don't know about its status - whether it is still beta or already granted for general use. Maybe someone else can provide more information on this particular topic? De rien! Dennis

2005-05-09, 02:27	#3
dsouza123 Sep 2002 2·331 Posts	Version 24.11 can be downloaded from ftp://mersenne.org/gimps/ the file p95v2411.zip contains Prime95.exe version 24.11 it may give a few percent increase in speed. For the exponent posted above with an iteration time of 0.144 it will take 44.18 days, if run 24/7. For every 0.001 reduction in iteration time it saves about 3/10 of a day.

2005-05-09, 05:03	#4
Joël Harismendy Aug 2004 France (Aquitaine) 16₈ Posts	And How can I do with my Job started ? May I install this new version now during my work ? What can I do to install the new version and not loose the actuel work ? Thx JH

2005-05-09, 05:21	#5
sdbardwick Aug 2002 North San Diego County 5×137 Posts	It is very easy to use 24.11 without losing any work; only an updated .exe file is required, not a new install. 1. Stop and exit Prime95 from the File menu. 2. Locate your Prime95 directory (usually ../Program Files/Prime95/)and rename Prime95.exe to Prime95.old 3. Download p95v2411.zip from the above link. 4. Extract Prime95.exe from the .zip to the Prime95 directory you found in step 2 5. Double click on Prime95.exe and it will pick up where version 23.8 left off, using all of the 23.8 settings.

2005-05-09, 10:49	#6
Mystwalker Jul 2004 Potsdam, Germany 1100111111₂ Posts	I'd also backup the cache file of the test - just in case a serious bug is detected in 24.11. Unlikely, but it only takes 2 seconds to be on the sure side...

2005-05-09, 16:58	#8
Mystwalker Jul 2004 Potsdam, Germany 831₁₀ Posts	Prime95 is heavily SSE2-optimized, and at least the socket A Semprons don't have SSE2: http://www.amd.com/us-en/Processors/..._11604,00.html

2005-05-09, 22:08	#9
Joël Harismendy Aug 2004 France (Aquitaine) 16₈ Posts	So ? What can I do to go faster ? Nothing ? Merci

2005-05-10, 01:26	#10
sdbardwick Aug 2002 North San Diego County 5·137 Posts	On 32 bit AMD processors, updating from version 23.x to 24.6 decreases iteration times by 15% to 33%, depending on FFT size. 24.11 was oriented towards 64 bit AMD processors; sorry if we misled you earlier. My Athlon MP 1900+ (1600 MHz) running 24.6 has about the same iteration time as your 2000 MHz Sempron running 23.8. 24.6 installs the same way as I outlined for 24.11. Substitute p95v246.zip for p95v2411.zip.

2005-05-10, 05:30	#11
Joël Harismendy Aug 2004 France (Aquitaine) 2·7 Posts	My monitor is Sonic of 19 ' and with 24.11 version I have 0.119 sec per itération ! It is not speed ! I regret this speed and I don't see what to do ! @+ JH