[QUOTE=pepi37;346442]I use Prime 27.9 if I need quickly to verify that number is PRP or not. But I noticed next behavior, and that is in same time question: I can set program to use 4 threads on quadcore CPU, and it is ok, but Prime only uses about 72-80% of CPU. Can I manage to to get 100% of use?
This is local.txt[/QUOTE]
What kind of quad core is it? If your CPU has Hyperthreading on it, you'll never use 100% of it (and wouldn't want to as it's not faster).

i7-2700K with HT off

I saw 28.1 mentioned earlier, is that only an in house release?

[QUOTE=tului;349321]I saw 28.1 mentioned earlier, is that only an in house release?[/QUOTE]

It is still in development. It is basically version 27.9 with Haswell enhancements.

[QUOTE=Prime95;349323]It is still in development. It is basically version 27.9 with Haswell enhancements.[/QUOTE]

My Sandy Bridge is already approaching decrepitude :no:

[QUOTE=Prime95;349323]It is still in development. It is basically version 27.9 with Haswell enhancements.[/QUOTE]

Can't wait to see what it does on my lappy.

Prime95 (version 27.9, build 1) has been unable to communicate a result to the server despite numerous attempts:

[Main thread Aug 21 10:01] Mersenne number primality test program version 27.9
[Main thread Aug 21 10:01] Optimizing for CPU architecture: Core i3/i5/i7, L2 cache size: 256 KB, L3 cache size: 6 MB
[Comm thread Aug 21 10:01] Updating computer information on the server
[Main thread Aug 21 10:01] Starting workers.
[Comm thread Aug 21 10:01] Sending result to server: UID: richs/work-new, M29576419 is not prime. Res64: 2BBB7D00CCE____. We1: 6D8A12E5,7867395,00000000, AID:
[Comm thread Aug 21 10:01]
[Comm thread Aug 21 10:01] PnErrorResult value missing. Full response was:

followed by a lot of html commands. I blanked the last four digits of the residue.

Any suggestions?

Is there a proxy server involved? Do the proxy settings need to be changed?

Try putting "Debug=2" in the [Primenet] section of prime.txt. Restart prime95. This should output the complete server response to the prime.log file. This response might help us figure out what the problem is.

Debug=2 showed that mersenne.org was newly blocked by our company spam filter. I'll get that corrected. Thanks for the advice, George.

Every result of Prime95 is in format ( using Prime95 for PRP test)

x*xx^xxxxxxx-1 is not prime. RES64: E57D7936A6CAACCC. We4: 9A9ABA99,00000000

Can output be without [U]We4: 9A9ABA99,00000000 ?
[/U]And if can what option to use?

[QUOTE=pepi37;350562]x*xx^xxxxxxx-1 is not prime. RES64: E57D7936A6CAACCC. We4: 9A9ABA99,00000000

Can output be without [U]We4: 9A9ABA99,00000000 ?
[/U]And if can what option to use?[/QUOTE]
That tells the error status results at the end of the run. It is important for flagging numbers to get a "quick double check". If the test was bad, a new prime could have been missed. Better to double check sooner rather than later.