Mlucas v20.1.1 (latest) available

[ewmayer]

06 Jul 2022: Patch Alert: Small patch which fixes an infrequent (but run-killing when it occurs) issue with multithreaded runs of p-1 stage 2, discovered by tdulcet during his large-batch p-1 work. The version number remains v20.1.1. As always, details and download info at the README page.

Those of you using tdulcet's mlucas.sh install script will want to grab the latest version, but check the SUM-field value and if it differs from the one (8d8851f5e383d8a74cf067192474256a) for the current-download of v20.1.1, manually change it to the md5 checksum listed for the latter at the README.

As always, post bug reports, usage comments and whatnot here, and thanks for the builds and compute cycles!

[tdulcet]

Originally Posted by ewmayer

Those of you using tdulcet's mlucas.sh install script will want to grab the latest version, but check the SUM-field value and if it differs from the one (e3302de913e7bf65a83985d68a1193e1) for the current-download of v20.1.1, manually change it to the md5 checksum listed for the latter at the README.

Thanks for providing instructions for users while they waited for me to update the script. I just pushed the new md5sum for Mlucas v20.1.1 to my repository. See here for the change and here for the original changes.

[ixfd64]

I noticed that mlucas now supports exponents up to around nine billion. Although I don't expect anyone to test those numbers anytime soon, this is really cool nonetheless.

[ewmayer]

Note to 20.1.1 users: there is a small messaging bug in v20.1.1 where a missing mlucas.ini entry for one of the supported options triggers a "User set unsupported value = NaN ... ignoring" message. The warning is benign and will go away in the next release.

Originally Posted by ixfd64

I noticed that mlucas now supports exponents up to around nine billion. Although I don't expect anyone to test those numbers anytime soon, this is really cool nonetheless.

Well, not LL or PRP-test, anyway - p-1 on such behemoths is feasible, however, if the user's system has at least 128GB of memory.

[ewmayer]

Patch Alert: There was [a] a PRP-postprocessing bug leading to a sanity-check assertion-exit, and [b] a p-1 premature-exit-at-end-of-stage-1 bug in the initial v20.1.1 release. (01 Nov, md5 = e3302de913e7bf65a83985d68a1193e1). Please make sure you get the current version (06 Nov, md5 = c917eb8faa6ff643d359b335cdacbfda) if you do either of these kinds of GIMPS assignments. If you hit either of these bugs, restarting the aborted assignment using an updated build should get you back on track.

[tdulcet]

Originally Posted by ewmayer

Those of you using tdulcet's mlucas.sh install script will want to grab the latest version, but check the SUM-field value and if it differs from the one (c917eb8faa6ff643d359b335cdacbfda) for the current-download of v20.1.1, manually change it to the md5 checksum listed for the latter at the README.

Thanks. I just pushed the new md5sum to my repository. See here for the change.

[ewmayer]

Just uploaded an updated version of the v20.1.1 tarball with several not-critical-but-nice-to-have bugfixes, and 2 feature-adds:

1. Signal-handling has been restored;
2. More-flexible workfile parsing, assignment ID no longer required for p-1 assignments, and may be "n/a" for all supported work types.

As always, see the README page for more details and download link, and the help.txt file in the unpacked code archive for full details.

[tdulcet]

Originally Posted by ewmayer

Those of you using tdulcet's mlucas.sh install script will want to grab the latest version, but check the SUM-field value and if it differs from the one (81655bf24742b22dcd853741e3ebaefe) for the current-download of v20.1.1, manually change it to the md5 checksum listed for the latter at the README.

Thanks. I just pushed the updated script to my repository. See here for the full changes.

It will now automatically save the “Benchmark Summary” table that is output at the end of the script to a bench.txt file for future reference. Here is an example of this file on a 4 core ARM system:

~/mlucas_v20.1.1/obj$ cat bench.txt
#  Workers/Runs  Threads  -cpu arguments
1  4             1        0 1 2 3
2  2             2        0:1 2:3
3  1             4        0:3
        Adjusted msec/iter times (ms/iter) vs Actual iters/sec total throughput (iter/s) for each combination

FFT     #1               #2               #3
length  ms/iter  iter/s  ms/iter  iter/s  ms/iter  iter/s
2048K   36.89    98.255  38.72    96.242  40.48    98.551
2304K   43.87    81.526  45.94    79.443  48.88    83.452
2560K   48.57    75.435  52.12    69.893  53.08    75.775
2816K   54.65    68.347  58.7     62.614  59.16    68.125
3072K   60.74    61.914  63.04    57.576  66.32    60.968
3328K   65.18    57.619  68.58    54.557  71.4     56.944
3584K   71.09    53.280  74.96    51.005  77.6     52.751
3840K   77.28    49.119  80.9     47.089  83.92    48.010
4096K   73.49    51.111  80.7     48.070  84.8     48.704
4608K   92.59    41.217  96.66    40.683  101.4    39.866
5120K   101.62   37.520  106.44   36.146  110.96   36.089
5632K   113.13   33.656  118.4    33.558  124.88   32.784
6144K   122.81   30.797  128.5    30.565  134.56   30.017
6656K   134.6    28.203  141.3    28.122  147.84   27.560
7168K   145.57   25.910  152.58   26.069  157.6    25.673
7680K   160.37   23.800  166.2    23.887  172.68   23.492

[lalera]

hi,
can mlucas doing wagstaff numbers (like prime95/mprime) ?

[kriesel]

No. Mersenne & Fermat numbers; P-1 LL PRP, & P-1 Pepin test respectively.
https://www.mersenneforum.org/showpo...91&postcount=2
https://www.mersenneforum.org/showpo...2&postcount=11

[lalera]

Originally Posted by kriesel

No. Mersenne & Fermat numbers; P-1 LL PRP, & P-1 Pepin test respectively.
https://www.mersenneforum.org/showpo...91&postcount=2
https://www.mersenneforum.org/showpo...2&postcount=11

thank you !