New features in Version
22.13 of prime95.exe
- A P-1
and ECM QA suite was implemented.
A bug in ECM for exponents below 172,700 and near the limit of an
FFT size and using SSE2 code was fixed.
New features in Version
22.12 of prime95.exe
1.
A bug was fixed that caused some factors to be missed in stage
2 of P-1 when the available memory did not let the program allocate 12
temporary variables. If testing a
number in the 16 millions using an FFT size of 768K, then each temporary takes
768K * 8 bytes or 6MB. If your memory
setting was less than 72MB (6MB * 12 temporaries) then you were affected by the
bug. Actual the program allocates some
fixed tables so anything less than about 75MB triggered the bug.
New features in Version
22.11 of prime95.exe
- A bug
that caused factors to be missed in the last stage of P-1 and ECM
factoring was fixed. The bug was
introduced in executables built after Sept. 28, 2002.
New features in Version
22.10 of prime95.exe
1.
When running a double-check assignment the preferred trial
factoring depth is reduced one bit.
This is done because finding a factor will save one LL test instead of
the usual two LL tests.
2.
On a Windows NT/2000/XP system, if prime95 is run by a user
without administrator privileges then prime95 cannot install itself as a
service. Thus, the Start at Bootup
option will set prime95 to run at login time rather than bootup time.
3.
A crash bug when selecting "Start at Bootup" on
Windows NT3 and Windows NT4 systems was fixed.
4.
Bug in starting more than one prime95 as NT services on
multi-processor machines was fixed.
New features in Version
22.9 of prime95.exe
- Error
rate for a clean run is now estimated at 1.8% raising your chances of
finding a Mersenne prime while double-checking.
- You can
now stop and continue testing from the system tray menu.
- You
can now pause prime95 when another program starts running. See the PauseWhileRunning option in
undoc.txt.
- Fixed
bug introduced in 22.8 where No Icon did not work if Start at Bootup was
also specified in Windows 98.
- A bug
in unscrambling the proxy server password in primenet.ini was fixed.
New
features in Version 22.8 of prime95.exe
- Soft
FFT crossovers have been implemented.
If you test an exponent that is within 0.2% of the old hard FFT
crossover point, then 1000 test iterations are run to determine if the
smaller or larger FFT is appropriate for the exponent. Although not recommended, you can
adjust prime95's behavior to be more aggressive using the SoftCrossover
and SoftCrossoverAdjust features discussed in undoc.txt.
- To
better stress main memory, the torture test will now use up to the amount
of memory specified in the Options/CPU dialog box.
- Iterations
with roundoff checking are a little faster for non-SSE2 CPUs.
New features in Version
22.7 of prime95.exe
- Trial
factoring above 2^64 on a P4 now uses the SSE2 instructions. This is more than four times as fast as
the previous version.
- Old
Advanced/Factoring save files are not compatible with this version. They
are named p0000000 and should be deleted.
This should not be a problem as no one should be using this
obsolete and unsupported feature.
- Four
more x87 FFT crossover changes as suggested by Brian Beesley's research.
- You can
now change the NT/2000/XP service name and service display name. See undoc.txt for details.
- Bug
where found factors were silently truncated to 200 digits was fixed.
New features in Version
22.6 of prime95.exe
- The
Start At Bootup option now runs prime95 as a Windows NT/2000/XP
service!! Normally Windows
NT/2000/XP will not run GUI programs as services, but several tricks have
allowed us to get this working almost flawlessly.
- To
reduce spurious error reports on x86 LL tests near the crossover points,
the program now allows roundoff errors less than 0.40625 rather than less
than 0.4.
New
features in Version 22.5 of prime95.exe
1.
A bug
in P4 roundoff error recovery was fixed.
Bug was present in version 22 executables dated between May 22 and June
18.
2.
Prime95
now properly detects if the program is running by another logged in Windows XP
user.
3.
When Tray
Icon or Hide Icon is set, the "X" in the upper right corner no longer
closes prime95 rather it minimizes it.
Also right clicking the tray icon now brings up a popup menu.
4.
Changed the way prime95 shuts down. Logoff in WinXP used to hang.
New features in
Version 22.4 of prime95.exe
1. A little more tweaking
of the FFT crossovers.
2. A GCD hang bug was fixed in case where
there were a large number of entries in the lowm.txt file. Another
GCD bug affecting ECM on F18 was fixed.
New
features in Version 22.3 of prime95.exe
- Given more data, the roundoff
error checking is now done on every iteration for exponents within 0.5% of
the maximum that can be tested by the current FFT length. If a roundoff error above 0.4 occurs,
then the iteration is now repeated without any change to the shift
count. It now takes a roundoff
error greater than 0.6 to corrupt the results.
- Many of the FFT ranges have
changed. Version 21 was too
aggressive in choosing FFT sizes for the P4. The new handling of roundoff errors above 0.4 lets us be
more aggressive with the non-P4 code.
- Result lines are now WYn
rather than WXn.
- A crash bug affecting P-1 and
ECM using the 2^N+1 option for large N was fixed.
- A rare memory corruption and
possible crash bug in the GCD code was fixed.
- The -t command line argument
will run the torture test.
- To reduce wild fluctuations in
the RollingAverage, it will be updated roughly twice per day.
New features in Version 22.2 of prime95.exe
- Factoring assignments go to
machines slower than a 233 MHz Pentium.
Double-checks are assigned to machines slower than a 500 MHz P-III.
- The speed of the GCD has been
improved.
- Some of the P4 FFT ranges have
changed. Version 21 was too
aggressive in choosing FFT sizes for the P4.
- Roundoff error checking is now
done on every iteration for exponents within 2% of the maximum that can be
tested by the current FFT length.
See undoc.txt for ways to disable this new feature.
- The previous version would get
into an infinite loop if a repeatable roundoff error larger than 0.48 was
discovered. Now, if a repeatable
roundoff error greater than 0.45 is found, then the iteration is repeated
after shifting the FFT data.
New features in Version 22.1 of prime95.exe
- Some bugs in error handling
when communicating with the server have been fixed.
- Communicating with the server
by RPC is no longer supported. The
HTTPNET.DLL and RPCNET.DLL have been deleted. Only "Basic" Proxy server authentication is
supported. Version 21 may have
supported MS Proxy Server 2.0's NTLM (NT Lan Manager) challenge/response
authentication.
- The program now uses a high
resolution timer rather than the RDTSC instruction to time events. This should help the program display
accurate timings on laptops with SpeedStep or desktops that can
hibernate. You can force the
program to use the old RDTSC timing method with the RdtscTiming option
described in undoc.txt.
- The program uses a updated
algorithm to automatically detect CPU type and speed. The Options/CPU dialog box no longer
let's you set this information.
Instead, the Options/CPU dialog displays the detected CPU type and
speed. This new feature helps
prevent incorrect settings when users upgrade or try several overclocking
speeds. If the new algorithm
fails, you can override the settings as described in undoc.txt.
- Benchmark now writes the
program version, timing methodology, cpu type and speed, L1 and L2 cache
information to results.txt. It
will refuse to benchmark if rdtsctiming is 10.