Do different types of GPUGrid tasks use different amounts of GPU RAM, especially at startup?

I have two 512MB 9800GT-class cards, both testing the new v6.10.46 BOINC client. Both are running ACEMD v6.03 tasks.

One is running p47-IBUCH_0510_pYEEI_long_100421-0-12-RND3168_0 without problems.

The other tried to start f237-TONI_CAPBIND99SB-51-100-RND2375_1, but failed with

I think I can duplicate the problem on Vista64, but not on Windows XP. I do not have that debug message about memory, probably because I do not have debug turned on.

Here is what I found on Vista-64. I first enabled gpugrid for two tasks and got only pair of IBUCH for 6.10.43. This seemed to work and I then stopped boinc and installed 6.10.46. I have a gtx9800 (512mb) and a gts250 (1024mb)

The two tasks started up ok.

2010-04-22 10:33:11 AM NVIDIA GPU 0: GeForce 9800 GTX/9800 GTX+ (driver version 19745, CUDA version 3000, compute capability 1.1, 496MB, 442 GFLOPS peak)
2010-04-22 10:33:11 AM NVIDIA GPU 1: GeForce GTS 250 (driver version 19745, CUDA version 3000, compute capability 1.1, 1006MB, 470 GFLOPS peak)
2010-04-22 10:33:12 AM GPUGRID Restarting task p34-IBUCH_51_pYEEI_100301-26-40-RND8331_1 using acemd2 version 603
2010-04-22 10:33:12 AM GPUGRID Restarting task p32-IBUCH_0511_pYEEI_long_100421-1-12-RND6657_1 using acemd2 version 603

<cc_config>
<options>
<use_all_gpus>1</use_all_gpus>
</options>
</cc_config>

but within about 30 seconds the one running on the GTX9800 stopped and started waiting to run. Note that I have enabled the use_all_gpus as shown above. I failed to copy the "before" but it might still be on the disk. During the 30 seconds or so it was running, it was going so slow that I knew somthing was wrong. While I was watching the second tick off I saw the message about waiting show up and it stopped crunching.




===then I tried same thing on windows xp that has two identical gtx9800+


Second, Windows XP (32 bit) 6.10.43 ran ok as follows:

I run the following on pair of 9800gtx+

jys-xp-2duo

5232 GPUGRID 4/22/2010 9:49:33 AM Starting p46-IBUCH_101c_pYEEI_100304-26-80-RND3796_0
5233 GPUGRID 4/22/2010 9:49:34 AM Starting task p46-IBUCH_101c_pYEEI_100304-26-80-RND3796_0 using acemd2 version 603
5234 GPUGRID 4/22/2010 9:49:34 AM Starting g125-TONI_CAPBIND99SB-58-100-RND5760_0
5235 GPUGRID 4/22/2010 9:49:35 AM Starting task g125-TONI_CAPBIND99SB-58-100-RND5760_0 using acemd2 version 603

I closed boinc and restarted and the tasks picked up ok. I then installed in 6.10.46 and it picked up ok. I then stopped it and restarted and it still ran ok.

1 4/22/2010 10:18:28 AM Starting BOINC client version 6.10.46 for windows_intelx86
jys-xp-2duo

15 4/22/2010 10:18:28 AM NVIDIA GPU 0: GeForce 9800 GTX/9800 GTX+ (driver version 19713, CUDA version 3000, compute capability 1.1, 512MB, 470 GFLOPS peak)
16 4/22/2010 10:18:28 AM NVIDIA GPU 1: GeForce 9800 GTX/9800 GTX+ (driver version 19713, CUDA version 3000, compute capability 1.1, 512MB, 470 GFLOPS peak)
46 GPUGRID 4/22/2010 10:18:29 AM Restarting task p46-IBUCH_101c_pYEEI_100304-26-80-RND3796_0 using acemd2 version 603
47 GPUGRID 4/22/2010 10:18:29 AM Restarting task g125-TONI_CAPBIND99SB-58-100-RND5760_0 using acemd2 version 603

[EDIT] Not working for windows xp either. Just takes a little longer, like 2 minutes and CAPBIND starts waiting. Then, it gets resumed and later it waits agin.

Mine is Windows XP, 32-bit, and it's continuing under BOINC v6.10.47:

Mine is Windows XP, 32-bit, and it's continuing under BOINC v6.10.47:

22-Apr-2010 14:48:00 [SETI@home] Computation for task 28dc06aa.29060.3753.5.10.150_1 finished
22-Apr-2010 14:48:00 [GPUGRID] [coproc_debug] Assigning CUDA instance 0 to f237-TONI_CAPBIND99SB-51-100-RND2375_1
22-Apr-2010 14:48:00 [GPUGRID] [cpu_sched] Starting f237-TONI_CAPBIND99SB-51-100-RND2375_1(resume)
22-Apr-2010 14:48:00 [GPUGRID] Restarting task f237-TONI_CAPBIND99SB-51-100-RND2375_1 using acemd2 version 603
22-Apr-2010 14:48:03 [GPUGRID] [coproc_debug] CUDA device 0 lacks RAM for f237-TONI_CAPBIND99SB-51-100-RND2375_1
22-Apr-2010 14:48:03 [GPUGRID] [cpu_sched] Preempting f237-TONI_CAPBIND99SB-51-100-RND2375_1 (removed from memory)
22-Apr-2010 14:48:05 [GPUGRID] Starting p9-IBUCH_1010_PQpYIpYIPI_long_100421-1-4-RND6327_1
22-Apr-2010 14:48:05 [GPUGRID] [cpu_sched] Starting p9-IBUCH_1010_PQpYIpYIPI_long_100421-1-4-RND6327_1 (initial)
22-Apr-2010 14:48:05 [GPUGRID] Starting task p9-IBUCH_1010_PQpYIpYIPI_long_100421-1-4-RND6327_1 using acemd2 version 603

and away it ran.

Any ideas from Project Admin or developers on this?