Error while computing - Demodulation failed (error: 2)
21 Aug 2011 19:17:04 UTC
Topic 195914
(moderation:
Over the past three days two Binary Radio Pulsar Search (Arecibo) have failed in the same way:
[12:02:41][7004][ERROR] Input file on command line ../../projects/einstein.phys.uwm.edu/p2030.20090401.G44.11-02.39.S.b1s0g0.00100_186.binary doesn't agree with input file ../../projects/einstein.phys.uwm.edu/p2030.20090401.G44.11-02.39.S.b1s0g0.00100_185.binary from checkpoint header.
[12:02:41][7004][ERROR] Demodulation failed (error: 2)
[02:16:48][6984][ERROR] Input file on command line ../../projects/einstein.phys.uwm.edu/p2030.20090405.G60.08-02.33.S.b1s0g0.00000_282.binary doesn't agree with input file ../../projects/einstein.phys.uwm.edu/p2030.20090405.G60.08-02.33.S.b1s0g0.00000_281.binary from checkpoint header.
[02:16:48][6984][ERROR] Demodulation failed (error: 2)!
These are isolated incidents: in general the Arecibo jobs are running fine. Any ideas?
Error while computing - Demodulation failed (error: 2)
)
I have more than one Demodulation failed (error: 2) in the last day from one host.
But my symptoms don't seem to match Captain Bluebottle's August 2011 post perfectly.
Until the server expires them fuller error files may be found at errors for this host. I'll quote here what seems likely the most interesting portions.
[pre]Stderr output
6.12.34
The system cannot find the file specified. (0x2) - exit code 2 (0x2)
Activated exception handling...
[01:31:05][21588][INFO ] Starting data processing...
[07:26:37][18664][INFO ] Checkpoint committed!
[07:27:43][18664][INFO ] Checkpoint committed!
[07:28:36][18664][INFO ] Data processing finished successfully!
[07:28:36][18664][INFO ] Starting data processing...
[07:28:37][18664][INFO ] CUDA global memory status (initial GPU state, including context):
------> Used in total: 517 MB (477 MB free / 994 MB total) -> Used by this application (assuming a single GPU task): 222 MB
[07:28:37][18664][INFO ] Using CUDA device #0 "GeForce GTX 460" (336 CUDA cores / 1095.36 GFLOPS)
[07:28:37][18664][INFO ] Version of installed CUDA driver: 4000
[07:28:37][18664][INFO ] Version of CUDA driver API used: 3020
[07:28:37][18664][INFO ] Thank you but this work unit has already been processed completely...
[07:28:37][18664][ERROR] Input file on command line ../../projects/einstein.phys.uwm.edu/p2030.20110912.G48.45+00.57.N.b3s0g0.00000_364.bin4 doesn't agree with input file ../../projects/einstein.phys.uwm.edu/p2030.20110912.G48.45+00.57.N.b3s0g0.00000_363.bin4 from checkpoint header.
[07:28:37][18664][ERROR] Demodulation failed (error: 2)!
07:28:37 (18664): called boinc_finish
[/pre]
I don't know whether to suspect my host is making a repetitive error, there is something funny in these WUs, or the server did me a bad turn of some kind.