Posts by Samdani

41) Message boards : Number crunching : **CLOSED SETI/BOINC Milestones (tm) XVI CLOSED** (Message 881015)
Posted 31 Mar 2009 by Profile Samdani
Post:
1,200,000 Cobblestones for SETI@home.
42) Message boards : Number crunching : **CLOSED SETI/BOINC Milestones (tm) XVI CLOSED** (Message 872392)
Posted 5 Mar 2009 by Profile Samdani
Post:
1,100,000 Cobblestones for SETI@home.
43) Message boards : Number crunching : **CLOSED SETI/BOINC Milestones (tm) XVI CLOSED** (Message 863457)
Posted 8 Feb 2009 by Profile Samdani
Post:
1,000,000 Cobblestones for SETI@home.
44) Message boards : Number crunching : **CLOSED SETI/BOINC Milestones (tm) XVI CLOSED** (Message 852642)
Posted 12 Jan 2009 by Profile Samdani
Post:
900,000 Cobblestones for SETI@home.
45) Message boards : Number crunching : Personal Super computer? (Message 843731)
Posted 22 Dec 2008 by Profile Samdani
Post:
Now that SETI@home can run on NVIDIA graphics boards using their CUDA computing engine, will it run on this ‘Tesla Personal Super Computer’ too?

Architecture is essentially the same, so I guess it should work without any modification or porting. Am I right?
46) Message boards : Number crunching : **CLOSED SETI/BOINC Milestones (tm) XVI CLOSED** (Message 840820)
Posted 17 Dec 2008 by Profile Samdani
Post:
800,000 Cobblestones for SETI@home.
47) Message boards : Number crunching : Personal Super computer? (Message 837476)
Posted 6 Dec 2008 by Profile Samdani
Post:
I have added 'ARMARI Magnetar TDX Pro' to my wish list.

It is only “100 times faster than standard PC”, but that is enough for me :)
48) Message boards : Number crunching : Personal Super computer? (Message 837463)
Posted 6 Dec 2008 by Profile Samdani
Post:
NVIDIA site says "250x the compute performance of a PC"
so 250 X 5,000 RAC = 12,50,000 (1.25 million),

Wow. Is that possible?
49) Message boards : Number crunching : Personal Super computer? (Message 837458)
Posted 6 Dec 2008 by Profile Samdani
Post:
Any thoughts on its RAC ?
50) Message boards : Number crunching : CLOSED* SETI/BOINC Milestones (tm) XV *CLOSED (Message 835090)
Posted 28 Nov 2008 by Profile Samdani
Post:
700,000 Cobblestones for SETI@home.
51) Message boards : Number crunching : CLOSED* SETI/BOINC Milestones (tm) XV *CLOSED (Message 828241)
Posted 8 Nov 2008 by Profile Samdani
Post:
600,000 Cobblestones for SETI@home.
52) Message boards : Number crunching : CLOSED* SETI/BOINC Milestones (tm) XV *CLOSED (Message 820444)
Posted 19 Oct 2008 by Profile Samdani
Post:
500,000 Cobblestones for SETI@home.
53) Message boards : Number crunching : Claimed credit zero (Message 815913)
Posted 8 Oct 2008 by Profile Samdani
Post:
Thanks Richard.

[Edit] By the way, can we access WU’s outcome and other information after it becomes invisible after validation? [/Edit]
54) Message boards : Number crunching : Claimed credit zero (Message 815682)
Posted 7 Oct 2008 by Profile Samdani
Post:
Fourth faulty find in a fortnight :(

wuid=337939889

55) Message boards : Number crunching : CLOSED* SETI/BOINC Milestones (tm) XV *CLOSED (Message 813559)
Posted 1 Oct 2008 by Profile Samdani
Post:
400,000 Cobblestones for SETI@home.
56) Message boards : Number crunching : Claimed credit zero (Message 813557)
Posted 1 Oct 2008 by Profile Samdani
Post:
Another one.

wuid=340692459

I think problem is quite widespread.
57) Message boards : Number crunching : Claimed credit zero (Message 810598)
Posted 21 Sep 2008 by Profile Samdani
Post:
Check these two units.

wuid=334479715
wuid=334928678

I think these belong to the same category.
58) Message boards : Number crunching : CLOSED***SETI/BOINC Milestones [tm] XIII***CLOSED (Message 749880)
Posted 8 May 2008 by Profile Samdani
Post:
300,000 Cobblestones for SETI@home
59) Message boards : Number crunching : Exceeded Disk Limit Error (Message 736921)
Posted 10 Apr 2008 by Profile Samdani
Post:
I'll add also : On Windows XP, make sure to use TweakUI powertoy from microsoft to disable 'Optimise hard disks when idle'. This will reduce the amount of disk access significantly, lowering risks [That may be significant with only 256mb ram in XP]. You should then defragment manually sometimes though.

Jason


Thanks for the tip Jason.
60) Message boards : Number crunching : Exceeded Disk Limit Error (Message 736831)
Posted 10 Apr 2008 by Profile Samdani
Post:
1. Downgrading Operating System.
2. Finding a way to prevent running scandisk on the partition that is holding SAH files.
3. Or perhaps just by changing ‘write to disk at most every XX seconds’ settings to a higher number in disk and memory usage option.


I agree with Jim and Alienator. Don't do option 1 or 2. NTFS is better choice. #3 is a good idea; mine is 300 seconds. Disable write caching on your drive too (find your hard disk in Device Manager). Purchasing a UPS is most definitely the next step.


Thanks everybody for your kind help and insights.
Incidentally, I had already applied changes suggested by DJStarFox. First, I Changed 'write to disk at most every XX seconds' settings to 300 seconds from a default of 60 seconds in BOINC Manger preferences in advanced menu. Then searching for some option to disable chkdsk's default behaviour, I stumbled across 'Enable write caching on the disk' settings under Hard Disk Properties in Device Manager. Its ‘Policies’ tab states that

"This setting enables write caching to improve disk performance, but a power outage or equipment failure might result in data loss or corruption."

It seemed relevant, so I unchecked the box ...

A little Google search also revealed a command line utility 'chkntfs.exe' which is part of the Windows OS. This utility 'Displays or modifies the checking of disks at boot time'.

The Microsoft article on chkntfs

For example:
chkntfs /x D: will disable chkdsk from running on drive D: at boot up.

My SAH files are already on a separate FAT32 partition, so I am planning to convert it to NTFS over the weekend to take advantage of chkntfs utility.

... but the first two changes are already showing very positive results as there are no aborted units in the past 48 hours despite several power outages :)

I will monitor the system for next two three days and will switch to NTFS and chkntfs utility if the problem resurfaces again.

Regards,
Samdani


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