20040618, 20:56  #1 
Mar 2004
1FD_{16} Posts 
Resuming test every 65536 iterations
Prime95 is resuming its LL test every 65536 iterations. It doesn't say why, and it doesn't say that it's stopping and restarting. I just have it running 24/7 without any special restrictions placed in prime.ini. My disk is not full or anything like that. Does this happen to anyone else? Do you know why this is happening?

20040618, 22:39  #2 
Jun 2003
The Computer
610_{8} Posts 
I noticed in Gameshark the max number for a value was 65535, and it explained why. That number must somehow be important in computers.

20040618, 23:53  #3 
Sep 2003
Borg HQ, Delta Quadrant
2×3^{3}×13 Posts 
I've never heard of that behavior before, but 65536 is special because it is the largest value that will fit inside a word value or register (16 bits, IIRC).

20040619, 02:02  #4 
"Mike"
Aug 2002
2^{2}·7^{2}·41 Posts 
Without trying I've memorized:
2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536, 131072, 262144, 524288, 1048576 & 2097152 Most of those numbers happen to coincide with the memory checker in the BIOS in the long line of computers I have owned... I guess watching my computer boot all these years has paid off... 
20040619, 02:51  #5  
Aug 2002
2^{6}×5 Posts 
Quote:


20040620, 13:56  #6 
May 2003
Republic of Moldova
2^{3}×5 Posts 
65536 is equal to 64 x 1024. That means that 64 Kbytes are equal to 65536 bytes, or that 64 Mbytes are equal to 65536 Kbytes (so if your computer has 64 Mb of RAM, you should see this magic number every day  at the computer's startup ).
Those who were programming for realmode DOS environment once should be able to say more about this number  the maximal size of one segment of memory was 64 Kb (or 65536 bytes), so a program module's size couldn't exceed that value. ColdFury, in programming terms, a "byte" has 8 bits (and can take 2^8 = 256 different values), a "word" has two bytes and therefore has 16 bits (and can take 2^16 = 256^2 = 65536 different values). Of course, modern processors have 32 or 64 bit registers (what means that the largest value a register can hold is 32 or 64 bit in size), but some generalpurpose registers can be "divided" into several smaller "subregisters", including a word register (16 bit) that PrimeCruncher mentioned. Xizzy, all the numbers you've mentioned are of 2^n form, and represent the usual sizes of computers' RAM. But I sense that these numbers are somehow connected with GIMPS (does anybody here know how?) . 
20040621, 01:00  #7  
Oct 2003
Portugal
13_{8} Posts 
Quote:


20040621, 01:11  #8  
Aug 2002
2^{6}×5 Posts 
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