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Message boards : Proth Prime Search : PPS Sieve consistently fails at startup (one machine only)

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River~~
Send message
Joined: 17 Mar 07
Posts: 342
ID: 6533
Credit: 15,792,075
RAC: 0
321 LLR Silver: Earned 100,000 credits (124,889)Cullen LLR Silver: Earned 100,000 credits (200,779)ESP LLR Silver: Earned 100,000 credits (112,791)Generalized Cullen/Woodall LLR Silver: Earned 100,000 credits (106,156)PPS LLR Amethyst: Earned 1,000,000 credits (1,358,025)PSP LLR Silver: Earned 100,000 credits (150,832)SoB LLR Gold: Earned 500,000 credits (573,744)SR5 LLR Gold: Earned 500,000 credits (500,731)SGS LLR Silver: Earned 100,000 credits (479,282)TRP LLR Silver: Earned 100,000 credits (328,373)Woodall LLR Silver: Earned 100,000 credits (119,260)Generalized Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (7,061,082)PPS Sieve Silver: Earned 100,000 credits (326,987)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Silver: Earned 100,000 credits (174,708)TRP Sieve (suspended) Gold: Earned 500,000 credits (505,558)AP 26/27 Gold: Earned 500,000 credits (598,364)GFN Ruby: Earned 2,000,000 credits (3,066,295)
Message 122785 - Posted: 21 Nov 2018 | 11:51:50 UTC
Last modified: 21 Nov 2018 | 12:32:33 UTC

Hi,

I am currently running 4 computers.

On this one the PPS sieve consistently gives a computation error at startup, and reports as zero time taken. I have run this successfully on another machine.

FIRST: is this the correct message board for this query? Or should I have used Help?

The BOINC Manager Event Log shows an error message

Output file <taskid>_0 for Task <taskid> absent


I have looked for those files and they are indeed absent. I have looked for files in the slots and in the primegrid folders.

There si also no sign of any stderr or stdout files relating to these tasks. I have looked between the prgram ending and the upload on a sample of three times, and there is never anything there.

I confirm that the two AP26 tasks that are running concurrently with the PPS-Sv DO have stderr.txt files in their slots. Also once I set the machine onto running SGS or GCW-Sv then those tasks run OK create std h
err.txt in an empty slot.

Deduction: the error occurs even before the task is run, or at the point of task startup, because either the client or the program itself does a sanity check looking for that file. The fact that GHW-Sv runs means it is not a generic sieving issue.

I deleted the binary file, and it automatically downloaded again, so I do not think it is a file corruption error.

There is over 1.5G diskspace free and available to BOINC, even with two*AP26 and 1"SGS running.

The VM has 4G of RAM, and my prefs allow up to 50% of that for BOINC

The Machine is a Virtual Machine running under Xen within the Qubes environment, using a Debian-9 OS recently updated. Both the guest and host are 64-bit machines.

I have uploaded the output from lscpu, uname -a, and cat /proc/meminfo here.

Please advise any other diagnostics I can do to shed light on this. In the meantime I am doing other PG work on this machine so it is not idle

Any ideas what the issue could be? And why the same program runs on a different (non-virutal) machine?
____________
My computers found:

9831*21441403+1 is a quadhectokilo prime prime, ie >400,000 digits ;)

252031090528237591 + 65521*149*23*19*17*13*11*7*5*3*2*n is prime for every n in { 0..20 } (an arithemtic progression of 21 primes)

Profile Michael GoetzProject donor
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Joined: 21 Jan 10
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The "Shut up already!" badge:  This loud mouth has mansplained on the forums over 10 thousand times!  Sheesh!!!Discovered the World's First GFN-19 prime!!!Discovered 1 mega primeFound 1 prime in the 2018 Tour de PrimesFound 1 prime in the 2019 Tour de Primes321 LLR Ruby: Earned 2,000,000 credits (2,810,011)Cullen LLR Ruby: Earned 2,000,000 credits (2,005,249)ESP LLR Turquoise: Earned 5,000,000 credits (5,009,577)Generalized Cullen/Woodall LLR Ruby: Earned 2,000,000 credits (2,145,754)PPS LLR Turquoise: Earned 5,000,000 credits (7,716,632)PSP LLR Ruby: Earned 2,000,000 credits (4,591,521)SoB LLR Sapphire: Earned 20,000,000 credits (34,221,148)SR5 LLR Turquoise: Earned 5,000,000 credits (8,293,415)SGS LLR Ruby: Earned 2,000,000 credits (2,014,138)TRP LLR Ruby: Earned 2,000,000 credits (2,737,347)Woodall LLR Ruby: Earned 2,000,000 credits (2,195,123)321 Sieve Turquoise: Earned 5,000,000 credits (5,055,870)Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (4,170,256)Generalized Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,059,304)PPS Sieve Sapphire: Earned 20,000,000 credits (20,110,788)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,035,522)TRP Sieve (suspended) Ruby: Earned 2,000,000 credits (2,051,121)AP 26/27 Jade: Earned 10,000,000 credits (10,114,260)GFN Emerald: Earned 50,000,000 credits (65,947,938)PSA Jade: Earned 10,000,000 credits (12,404,447)
Message 122786 - Posted: 21 Nov 2018 | 12:52:14 UTC - in response to Message 122785.

The VM has 4G of RAM, and my prefs allow up to 50% of that for BOINC


Your computer disagrees:

Memory 1265.16 MB


If you're only allowing 50% of that, and running 4 tasks, you might be running out of memory. According to WuProp, this much memory is used for a Linux version of each of these apps:

AP27: 314.1 MB (Pretty sure this is the GPU app, not the CPU ap. My Windows CPU apps used less than 10 MB.

GCW Sieve: 21.9

PPS-Sieve: 331.4 (Probably the GPU app)

SGS: 8.2

I had no information about the CPU version of the PPS-Sieve app, so I ran some. On Windows, it uses 258.13 MB of virtual memory and 130.23 MB in it's working set. Not sure how that works in Linux, but it's possible you're running out of memory.


____________
Please do not PM me with support questions. Ask on the forums instead. Thank you!

My lucky number is 75898524288+1

River~~
Send message
Joined: 17 Mar 07
Posts: 342
ID: 6533
Credit: 15,792,075
RAC: 0
321 LLR Silver: Earned 100,000 credits (124,889)Cullen LLR Silver: Earned 100,000 credits (200,779)ESP LLR Silver: Earned 100,000 credits (112,791)Generalized Cullen/Woodall LLR Silver: Earned 100,000 credits (106,156)PPS LLR Amethyst: Earned 1,000,000 credits (1,358,025)PSP LLR Silver: Earned 100,000 credits (150,832)SoB LLR Gold: Earned 500,000 credits (573,744)SR5 LLR Gold: Earned 500,000 credits (500,731)SGS LLR Silver: Earned 100,000 credits (479,282)TRP LLR Silver: Earned 100,000 credits (328,373)Woodall LLR Silver: Earned 100,000 credits (119,260)Generalized Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (7,061,082)PPS Sieve Silver: Earned 100,000 credits (326,987)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Silver: Earned 100,000 credits (174,708)TRP Sieve (suspended) Gold: Earned 500,000 credits (505,558)AP 26/27 Gold: Earned 500,000 credits (598,364)GFN Ruby: Earned 2,000,000 credits (3,066,295)
Message 122787 - Posted: 21 Nov 2018 | 13:08:04 UTC - in response to Message 122786.

The VM has 4G of RAM, and my prefs allow up to 50% of that for BOINC


Your computer disagrees:

Memory 1265.16 MB


If you're only allowing 50% of that, and running 4 tasks, you might be running out of memory.


Not really running out but apparently so: there is up to 4G available -- the hypervisor adds more as and when requested by the guest. However the client does not expect the memory to grow...

I will try setting 100% memory and see if that helps.

I will also find out the actual amount of memory in use by these tasks on Linux. I will have to figure out how to avoid double counting -- the code pages of the executable count towards BOTH/ALL tasks running the same executablre, but only exist in memory once.

When the current AP fallover completes, I will try running a single PPS Sv on this machine

----

However: one thing makes me wonder if your dagnosis is correct: I have had tasks refuse to start in the past (on smaller machines) with an error that explicitly says there is not enough memory. This failure looks different -- perhaps it is a misreported memory shortage, or perhaps it is something else.
____________
My computers found:

9831*21441403+1 is a quadhectokilo prime prime, ie >400,000 digits ;)

252031090528237591 + 65521*149*23*19*17*13*11*7*5*3*2*n is prime for every n in { 0..20 } (an arithemtic progression of 21 primes)

River~~
Send message
Joined: 17 Mar 07
Posts: 342
ID: 6533
Credit: 15,792,075
RAC: 0
321 LLR Silver: Earned 100,000 credits (124,889)Cullen LLR Silver: Earned 100,000 credits (200,779)ESP LLR Silver: Earned 100,000 credits (112,791)Generalized Cullen/Woodall LLR Silver: Earned 100,000 credits (106,156)PPS LLR Amethyst: Earned 1,000,000 credits (1,358,025)PSP LLR Silver: Earned 100,000 credits (150,832)SoB LLR Gold: Earned 500,000 credits (573,744)SR5 LLR Gold: Earned 500,000 credits (500,731)SGS LLR Silver: Earned 100,000 credits (479,282)TRP LLR Silver: Earned 100,000 credits (328,373)Woodall LLR Silver: Earned 100,000 credits (119,260)Generalized Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (7,061,082)PPS Sieve Silver: Earned 100,000 credits (326,987)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Silver: Earned 100,000 credits (174,708)TRP Sieve (suspended) Gold: Earned 500,000 credits (505,558)AP 26/27 Gold: Earned 500,000 credits (598,364)GFN Ruby: Earned 2,000,000 credits (3,066,295)
Message 122788 - Posted: 21 Nov 2018 | 14:01:17 UTC - in response to Message 122786.

Some further testing re memory sizes: it seems that the amount of memory the machine has in your database is taken as a snapshot when the client starts up.

Therefore if the client is started automatically at boot, the memory is going to be understated becasue BOINC and any oy other processes (like Firefox) have not yet requisitioned memery that will make the memory grow dynamically.

Restarting the client while running reflects the amount of memory under more realistic circumstances: However, this would be a pain to have to do every time.

I think (whether this is the root cause of the problem or not) we have between us exposed a bug in the Xen hypervisor. The MemTotal figure in /proc/meminfo should reflect the maximum available to the VM, not the amount currently allocated; or at least this should be avaialable somewhere accessible to the BOINC software. As it seems not be be anywhere visible within the VM, neither BOINC nor PG can be held responsible for not using the correct figure.

I will find out early evening UT whether doubling the apparent memory solves the issue and report back late evening UT
____________
My computers found:

9831*21441403+1 is a quadhectokilo prime prime, ie >400,000 digits ;)

252031090528237591 + 65521*149*23*19*17*13*11*7*5*3*2*n is prime for every n in { 0..20 } (an arithemtic progression of 21 primes)

River~~
Send message
Joined: 17 Mar 07
Posts: 342
ID: 6533
Credit: 15,792,075
RAC: 0
321 LLR Silver: Earned 100,000 credits (124,889)Cullen LLR Silver: Earned 100,000 credits (200,779)ESP LLR Silver: Earned 100,000 credits (112,791)Generalized Cullen/Woodall LLR Silver: Earned 100,000 credits (106,156)PPS LLR Amethyst: Earned 1,000,000 credits (1,358,025)PSP LLR Silver: Earned 100,000 credits (150,832)SoB LLR Gold: Earned 500,000 credits (573,744)SR5 LLR Gold: Earned 500,000 credits (500,731)SGS LLR Silver: Earned 100,000 credits (479,282)TRP LLR Silver: Earned 100,000 credits (328,373)Woodall LLR Silver: Earned 100,000 credits (119,260)Generalized Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (7,061,082)PPS Sieve Silver: Earned 100,000 credits (326,987)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Silver: Earned 100,000 credits (174,708)TRP Sieve (suspended) Gold: Earned 500,000 credits (505,558)AP 26/27 Gold: Earned 500,000 credits (598,364)GFN Ruby: Earned 2,000,000 credits (3,066,295)
Message 122789 - Posted: 21 Nov 2018 | 14:25:00 UTC

Question: to any programmer who knows the Linux client:

Which figure does the client report to the project for memory size at startup?

Does it come from /proc/meminfo ?

If so, which figure in that file?

If not, where?

----

If nobody here can answer this I will take it to the BOINC forum (where arguably this q belongs)
____________
My computers found:

9831*21441403+1 is a quadhectokilo prime prime, ie >400,000 digits ;)

252031090528237591 + 65521*149*23*19*17*13*11*7*5*3*2*n is prime for every n in { 0..20 } (an arithemtic progression of 21 primes)

Profile Michael GoetzProject donor
Volunteer moderator
Project administrator
Project scientist
Avatar
Send message
Joined: 21 Jan 10
Posts: 13013
ID: 53948
Credit: 199,689,421
RAC: 215,882
The "Shut up already!" badge:  This loud mouth has mansplained on the forums over 10 thousand times!  Sheesh!!!Discovered the World's First GFN-19 prime!!!Discovered 1 mega primeFound 1 prime in the 2018 Tour de PrimesFound 1 prime in the 2019 Tour de Primes321 LLR Ruby: Earned 2,000,000 credits (2,810,011)Cullen LLR Ruby: Earned 2,000,000 credits (2,005,249)ESP LLR Turquoise: Earned 5,000,000 credits (5,009,577)Generalized Cullen/Woodall LLR Ruby: Earned 2,000,000 credits (2,145,754)PPS LLR Turquoise: Earned 5,000,000 credits (7,716,632)PSP LLR Ruby: Earned 2,000,000 credits (4,591,521)SoB LLR Sapphire: Earned 20,000,000 credits (34,221,148)SR5 LLR Turquoise: Earned 5,000,000 credits (8,293,415)SGS LLR Ruby: Earned 2,000,000 credits (2,014,138)TRP LLR Ruby: Earned 2,000,000 credits (2,737,347)Woodall LLR Ruby: Earned 2,000,000 credits (2,195,123)321 Sieve Turquoise: Earned 5,000,000 credits (5,055,870)Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (4,170,256)Generalized Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,059,304)PPS Sieve Sapphire: Earned 20,000,000 credits (20,110,788)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,035,522)TRP Sieve (suspended) Ruby: Earned 2,000,000 credits (2,051,121)AP 26/27 Jade: Earned 10,000,000 credits (10,114,260)GFN Emerald: Earned 50,000,000 credits (65,947,938)PSA Jade: Earned 10,000,000 credits (12,404,447)
Message 122790 - Posted: 21 Nov 2018 | 14:47:10 UTC - in response to Message 122788.

I have never seen this behavior before, which leads me to suspect it's a Xen setting. Xen's pretty common, and if this was a widespread issue I think we'd have heard about it before. Nor did anything pop up in a Google search.

I'm a novice at Xen, but maybe I (or someone else) can spot something in the VM configuration? Want to post the VM's config file?
____________
Please do not PM me with support questions. Ask on the forums instead. Thank you!

My lucky number is 75898524288+1

River~~
Send message
Joined: 17 Mar 07
Posts: 342
ID: 6533
Credit: 15,792,075
RAC: 0
321 LLR Silver: Earned 100,000 credits (124,889)Cullen LLR Silver: Earned 100,000 credits (200,779)ESP LLR Silver: Earned 100,000 credits (112,791)Generalized Cullen/Woodall LLR Silver: Earned 100,000 credits (106,156)PPS LLR Amethyst: Earned 1,000,000 credits (1,358,025)PSP LLR Silver: Earned 100,000 credits (150,832)SoB LLR Gold: Earned 500,000 credits (573,744)SR5 LLR Gold: Earned 500,000 credits (500,731)SGS LLR Silver: Earned 100,000 credits (479,282)TRP LLR Silver: Earned 100,000 credits (328,373)Woodall LLR Silver: Earned 100,000 credits (119,260)Generalized Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (7,061,082)PPS Sieve Silver: Earned 100,000 credits (326,987)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Silver: Earned 100,000 credits (174,708)TRP Sieve (suspended) Gold: Earned 500,000 credits (505,558)AP 26/27 Gold: Earned 500,000 credits (598,364)GFN Ruby: Earned 2,000,000 credits (3,066,295)
Message 122793 - Posted: 21 Nov 2018 | 18:03:39 UTC - in response to Message 122790.
Last modified: 21 Nov 2018 | 18:17:10 UTC

Well that test failed. Even with lots of apparent memory (ie memory recognised by BOINC) the PPS-Sv failed in the same way.

I now think it is most likely a problem with Xen's willingness to overcommit memory. This is consistent with the task exit status of 11 (0xb) - Segmentation fault - see any of these tasks. Notably the stderr file never appears on my disk, but a short one IS generated and sent back to BOINC, as shown on each task page.

In detail the scenario I am imagining is that the program is loaded and started. It fairly soon asks for more memory (which appears to be available) and when it turns out to be overcommitted the linux kernel kills the task. If this occurs before the output file is created, that would explain the error message in the log (ie that message is not the cause of the abort but the effect of a very early abort).


I have never seen this behavior before, which leads me to suspect it's a Xen setting. Xen's pretty common, and if this was a widespread issue I think we'd have heard about it before.


This is not just Xen, it is Xen being run by Qubes, which is all the rarer. Running BOINC under Qubes is a pretty weird thing to do so in a way I am hoist by my own petard

Nor did anything pop up in a Google search.


Nor for me. I tried that too :(




I'm a novice at Xen, but maybe I (or someone else) can spot something in the VM configuration? Want to post the VM's config file?


I am a Xen novice too - I only use it as part of the Qubes OS

In qubes the Xen config is handled by a gui front end. I will have to ask on the Qubes forum where to find the Xen config files. I also have some other questions to ask there, like whether Qubes has an error log that tells me if Xen found itself unable to provide memory despite saying it was there..

Thank you very much for your help here -- I am coming down to the conclusion that this is not a PG problem so I am all the more grateful for your continued help :)

In about 24hours when the last of my AP fallover completes I will do some more testing. I have two tasks that are 50% complete and do not want to lose those, or delay their completion for other testing. If I find anything more I will post it here...
____________
My computers found:

9831*21441403+1 is a quadhectokilo prime prime, ie >400,000 digits ;)

252031090528237591 + 65521*149*23*19*17*13*11*7*5*3*2*n is prime for every n in { 0..20 } (an arithemtic progression of 21 primes)

River~~
Send message
Joined: 17 Mar 07
Posts: 342
ID: 6533
Credit: 15,792,075
RAC: 0
321 LLR Silver: Earned 100,000 credits (124,889)Cullen LLR Silver: Earned 100,000 credits (200,779)ESP LLR Silver: Earned 100,000 credits (112,791)Generalized Cullen/Woodall LLR Silver: Earned 100,000 credits (106,156)PPS LLR Amethyst: Earned 1,000,000 credits (1,358,025)PSP LLR Silver: Earned 100,000 credits (150,832)SoB LLR Gold: Earned 500,000 credits (573,744)SR5 LLR Gold: Earned 500,000 credits (500,731)SGS LLR Silver: Earned 100,000 credits (479,282)TRP LLR Silver: Earned 100,000 credits (328,373)Woodall LLR Silver: Earned 100,000 credits (119,260)Generalized Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (7,061,082)PPS Sieve Silver: Earned 100,000 credits (326,987)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Silver: Earned 100,000 credits (174,708)TRP Sieve (suspended) Gold: Earned 500,000 credits (505,558)AP 26/27 Gold: Earned 500,000 credits (598,364)GFN Ruby: Earned 2,000,000 credits (3,066,295)
Message 122805 - Posted: 22 Nov 2018 | 10:07:25 UTC

PPS-Sv memory usage on Linux is 277144 k which is 0.265 GiB

Of that 908k is shared, so that if multiple LLR tasks run concurrently the second and subsequent tasks only need an extra 2762136 k

In round figures, just over a quarter of a GiB but less than 0.3 GiB

The BOINC client takes 207724 k, so together they need just under half a GiB.

In comparison AP is tiny, just 3636 k, with 1504 k shared. So if I understand correctly, then two AP tasks together would add to 5768 k or four of them to
Ignoring the sharing, four AP tasks add to 14544, if I understand correctly the sharing reduces this by 4512 k to 10132 k.

My calculation of the total memry on Linux was still under half a GiB, so I was not exceeding the BOINC limits even with the setting of 50% x 1300 Mib. I expected to find that because BOINC is usually good at logging violations of the rules it enforces.

These figures taken from running top on more than one machine: the values differ from machine to machine by 4k or 8k, and I have quoted the largest I found in each case. Linux allocates memory in 4k chunks, so we are talking one or two chunks difference.

Everything points to it being a case thet Xen could not supply the memory promised, and the Guest Linux kernel imposing a seg fault as a result. I am sufficiently happy with that dignosis not to put a lot more work in; except to find the relevant logs within Qubes / Xen to see if the answer was there all the time.

Thanks once again for your input - your comment about having only about 1300 MiB triggered my train of thought.

Best regards
River~~
____________
My computers found:

9831*21441403+1 is a quadhectokilo prime prime, ie >400,000 digits ;)

252031090528237591 + 65521*149*23*19*17*13*11*7*5*3*2*n is prime for every n in { 0..20 } (an arithemtic progression of 21 primes)

Profile Michael GoetzProject donor
Volunteer moderator
Project administrator
Project scientist
Avatar
Send message
Joined: 21 Jan 10
Posts: 13013
ID: 53948
Credit: 199,689,421
RAC: 215,882
The "Shut up already!" badge:  This loud mouth has mansplained on the forums over 10 thousand times!  Sheesh!!!Discovered the World's First GFN-19 prime!!!Discovered 1 mega primeFound 1 prime in the 2018 Tour de PrimesFound 1 prime in the 2019 Tour de Primes321 LLR Ruby: Earned 2,000,000 credits (2,810,011)Cullen LLR Ruby: Earned 2,000,000 credits (2,005,249)ESP LLR Turquoise: Earned 5,000,000 credits (5,009,577)Generalized Cullen/Woodall LLR Ruby: Earned 2,000,000 credits (2,145,754)PPS LLR Turquoise: Earned 5,000,000 credits (7,716,632)PSP LLR Ruby: Earned 2,000,000 credits (4,591,521)SoB LLR Sapphire: Earned 20,000,000 credits (34,221,148)SR5 LLR Turquoise: Earned 5,000,000 credits (8,293,415)SGS LLR Ruby: Earned 2,000,000 credits (2,014,138)TRP LLR Ruby: Earned 2,000,000 credits (2,737,347)Woodall LLR Ruby: Earned 2,000,000 credits (2,195,123)321 Sieve Turquoise: Earned 5,000,000 credits (5,055,870)Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (4,170,256)Generalized Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,059,304)PPS Sieve Sapphire: Earned 20,000,000 credits (20,110,788)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,035,522)TRP Sieve (suspended) Ruby: Earned 2,000,000 credits (2,051,121)AP 26/27 Jade: Earned 10,000,000 credits (10,114,260)GFN Emerald: Earned 50,000,000 credits (65,947,938)PSA Jade: Earned 10,000,000 credits (12,404,447)
Message 122810 - Posted: 22 Nov 2018 | 12:36:28 UTC - in response to Message 122805.

I spoke to someone who has significant experience with both Xen and BOINC, and he has never heard of this problem. It's likely related to Qubes, whatever that is. I'd look there for answers.
____________
Please do not PM me with support questions. Ask on the forums instead. Thank you!

My lucky number is 75898524288+1

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