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Old 2003-04-11, 01:56   #1
TaliaW
 
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Default intermediate file write error

Hey lovely people
I've been running v.22 for about 2 months now, and just recently it's giving me this: Error writing intermediate file: rI128533 (that being the last 6 digits of my current number). I searched my computer for this file and couldn't find it, which may be part of the problem; I also looked for a Prime95 folder which might contain such program files, couldn't find that either. I'm sort of leery to restart my computer now, since I suspect I might lose all my work so far, so I'd like to know what's going on. If anyone can enlighten me, I'd really appreciate it. peace
-Talia
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Old 2003-04-11, 02:00   #2
Xyzzy
 
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Is your hard drive or quota full?

If there isn't enough room to write the file it won't be created...
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Old 2003-04-11, 03:21   #3
TaliaW
 
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aha! that might just be it...can i specify somewhere else for the file to write to, or do i just have to empty out that drive?
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Old 2003-04-11, 04:21   #4
Prime95
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While the program is running you'll have to empty out some space on that drive
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Old 2003-04-11, 11:57   #5
TaliaW
 
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I've freed up about 300 kb, which should be sufficient...I'll let you know if I have more problems. Thanks a bunch, y'all!
-Talia
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Old 2003-04-11, 13:12   #6
Reboot It
 
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Quote:
Originally Posted by TaliaW
I've freed up about 300 kb, which should be sufficient...
I suspect that if you are running a test on an exponent of that size (18128533) the save file will be about 4 MB (ie 4,096 KB).
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Old 2003-04-11, 16:23   #7
TaliaW
 
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ok, I uninstalled some random programs and have more than enough room, and all seems to be well, no more errors. lovely! thank you all. peace out.
-Talia
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Old 2003-04-12, 00:41   #8
markhl
 
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By default the program writes 2 save files, 2 * 4 = 8 MB. In any case, it sounds like you freed up enough space!
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Old 2003-04-12, 01:16   #9
cheesehead
 
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Each save file would be slightly longer than 18128533 / 8 = 2266067 bytes.
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Old 2003-04-12, 19:11   #10
markhl
 
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No, I am running an exponent of similar size, and each save file is close to 4 MB.
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Old 2003-04-12, 20:05   #11
NickGlover
 
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markhl is correct about the save file size and I think this is why:

M18128533 uses 1024K FFT. This means it uses 1,048,576 elements to compute the FFTs for this exponent. This comes out to 18,128,533 / 1,048,576 = 17.3 bits per element. This actually means that each element stores either 17 or 18 bits of the residue.

I think in George's implementation all the elements are stored in 32-bit unsigned ints. When saving a residue, I'm guessing the program just writes all the 32-bit ints to disk rather then pulling out the releveant 17 or 18 bits from each element. So, this would mean that the save file size for M18128533 is 1024K * 32 bits = 1024K * 4 bytes = 4096KB. It looks like save files are actually 22 bytes larger. Presumably, this is to store other necessary data like the actual exponent, iteration count, etc.
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