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drummers-lowrise
11) Message boards : Generalized Fermat Prime Search : GTX Titans (Message 68673)
Posted 3070 days ago by shinozkProject donor
I also have confirmed the beta driver 326.41 fixed the problem of rounding error of geneferCuda with TITAN.

We don't need lowering the memory clock now.
We can use the stock clock or overclock.
12) Message boards : Generalized Fermat Prime Search : New genefer (3.x.x) apps now available for testing (Message 64492)
Posted 3193 days ago by shinozkProject donor
I find that BOINC manager estimates CPU usage very high in genefercuda 3.1.2-1 (Windows 32-bit CUDA).
In my case, it shows "0.919 CPUs + 1 NVIDIA GPU (device 0)"l,
which has no problem with single GPU.
When I use multiple GPUs, its estimation exceeds 1 CPUs.
As a result, 1 core of the CPU can not run for other CPU tasks.



13) Message boards : Number crunching : GeForce GTX Titan (Message 63576)
Posted 3228 days ago by shinozkProject donor
Thanks. I will investigate the other factors.
14) Message boards : Number crunching : GeForce GTX Titan (Message 63550)
Posted 3229 days ago by shinozkProject donor
Recently, my most GFN Long tasks for my old GTX 580 result in error 6.
>cuda_subs.cu(332) : cufftSafeCall() CUFFT error: 6.

For Titan, I unfortunately changed hardware configrations(PSU, Matherboad), drivers(314.09), and msi afterburner(3.0.0. beta6). And genefer was updated(2.0.2) recently too.

I want to investigate the error.

I find in event log that the error is watch-dog timeout (2 seconds) of the driver, and there is dump of driver:
C:\Windows\LiveKernelReports\WATCHDOG\WD-20130317-0154.dmp
and the dump says VIDEO_TDR_TIMEOUT_DETECTED (117).
http://msdn.microsoft.com/en-us/windows/hardware/gg487368.aspx

The long task run with Shift=9 now.
>No project preference set; using AUTO-SHIFT=9

How long is the kernel of genefer running ?

15) Message boards : Number crunching : GeForce GTX Titan (Message 63469)
Posted 3232 days ago by shinozkProject donor
Thank you. I also saw my results. I found that SHIFT = 7 in my err cases, too.
I understand that there may be concurrency problem somewhere.

16) Message boards : Number crunching : GeForce GTX Titan (Message 63414)
Posted 3233 days ago by shinozkProject donor
Lowering mem clock leads to more stability enough to complete short tasks.
But it is slower than GTX580.

TITAN mem = 2500MHz:
SHIFT=8 468750^1048576+1 Time: 1.86 ms/mul. Err: 1.70e-001 5946413 digits

GTX 580 stock:
SHIFT=8 468750^1048576+1 Time: 1.69 ms/mul. Err: 1.48e-001 5946413 digits


There is no problem with your card, definitely. It may be related to algoritm calculating maxerr.

program bug?
if so, I don't understand why lowering memory clock leads to its stability.

In my experience, round error is mainly caused by overheated GPU and especially RAM.




17) Message boards : Number crunching : GeForce GTX Titan (Message 63334)
Posted 3234 days ago by shinozkProject donor
Titan becomes very hot soon, over 70C.
Even if I remain a stock speed, I had many Round Errors.
I need a Water cooling for TITAN.
I will spend a lot of money and time.

GPU=GeForce GTX TITAN
Global memory=4294967295 Shared memory/block=49152 Registers/block=65536 Warp size=32
Max threads/block=1024
Max thread dim=1024 1024 64
Max grid=2147483647 65535 65535
CC=3.5
Clock=875 MHz
# of MP=14
Generalized Fermat Number Bench 2
SHIFT=5 468750^1048576+1 Time: 3.72 ms/mul. Err: 1.64e-001 5946413 digits
SHIFT=6 468750^1048576+1 Time: 1.91 ms/mul. Err: 1.56e-001 5946413 digits
SHIFT=7 468750^1048576+1 Time: 1.59 ms/mul. Err: 1.56e-001 5946413 digits
SHIFT=8 468750^1048576+1 Time: 1.6 ms/mul. Err: 1.70e-001 5946413 digits
SHIFT=9 468750^1048576+1 Time: 1.83 ms/mul. Err: 1.72e-001 5946413 digits
SHIFT=10 468750^1048576+1 Time: 2.8 ms/mul. Err: 1.64e-001 5946413 digits
Best SHIFT determined experimentally. Saving AUTOSHIFT|genefercuda|3.1.1-0|0|GeForce GTX TITAN|875|1048576=7 to genefer.cfg.
No project preference set; using AUTO-SHIFT=7

Starting initialization...
maxErr during b^N initialization = 0.0000 (9.780 seconds).
Testing 139244^1048576+1...
Estimated total run time for 139244^1048576+1 is 7:51:49

maxErr exceeded for 139244^1048576+1, 0.5000 > 0.4500
MaxErr exceeded may be caused by overclocking, overheated GPUs and other transient errors.
Waiting 10 minutes before attempting to continue from last checkpoint...
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