[QUOTE=petrw1;321186]
Not sure now which version I should use??? or is this test is doomed to be flagged "suspect" or "bad". This LapTop has not had a bad test or errors before this.[/QUOTE]

Finish off the test. I suspect the result is OK. Tell us if it successfully completes the double-check.

I'll know by morning

Assuming it tests out fine I'm really annoyed at myself!!!
I realized a few weeks after I installed V26 late June on this PC that it was a Sandy but my Frontal Lobe short circuited and forgot to tell my Cerebral Cortex that with a Sandy I need to upgrade to V27.

Well I did today and found iteration times drop from 20 to 13 ms for a DC.
So in the last 5 months I missed out on over 20 DC's. :sad:

Use the AVX but kill the helper threads. Let only so many workers as many phys core you have. The additional HT cores produce just heat and "bad confidence" stuff. At least till version 28, when George finds what's going on :smile: One worker, one physical core. This solved the issue for me.

[QUOTE=LaurV;321232]Use the AVX but kill the helper threads. Let only so many workers as many phys core you have. The additional HT cores produce just heat and "bad confidence" stuff. At least till version 28, when George finds what's going on :smile: One worker, one physical core. This solved the issue for me.[/QUOTE]

Thanks
I have 2 cores ...
2 workers
1 core each

And it says 2 logical cores make up 1 physical core and still give me a helper thread with each.

[QUOTE=petrw1;321242]Thanks
I have 2 cores ...
2 workers
1 core each

And it says 2 logical cores make up 1 physical core and still give me a helper thread with each.[/QUOTE]
:shock::shock: Never seen that king of bug. Are you sure you set your workers right? Check the test/workers if you have "number of worker windows to run"=2, "worker number"="all workers", "CPUs to use"=1. And check if you don;t have strange settings in prime.txt and local.txt related to this.

[QUOTE=LaurV;321244]:shock::shock: Never seen that king of bug. Are you sure you set your workers right? Check the test/workers if you have "number of worker windows to run"=2, "worker number"="all workers", "CPUs to use"=1. And check if you don;t have strange settings in prime.txt and local.txt related to this.[/QUOTE]

Disable hyper-threading in BIOS and see if the problem persists.

[QUOTE=kladner;321247]Disable hyper-threading in BIOS and see if the problem persists.[/QUOTE]

That is off limits. My work laptop.

Oh well. It is understandable.

[QUOTE=Prime95;321201]Finish off the test. I suspect the result is OK. Tell us if it successfully completes the double-check.[/QUOTE]

Yup. DC residue matches. Next DC is not reporting errors.

[QUOTE=Prime95;320916]This is another instance of the rare "huge roundoff" error. I've been unable to guess at the cause.[/QUOTE]

I think I found it. Would anyone like to download version 27.9 from [url]ftp://mersenne.org/gimps[/url] and see if it is fixed? Thanks.

Yuck! :yucky:
Only my grandma is missing from that folder. Maybe some supermod can create an "old_versions" folder and move into it everything except the (all flavor of the) last version? It is very confusing for greenies, especially as the alphabetical sort does not match neither the version numbering nor the time line of development, even if the page is ftp-aware to be accessed/sorted locally with an ftp client like totalcmd... still messy.