RE: write failure occuring in writeScanRecInProgress function (after writing header) in saveData.c (sscan-2-6-6 module)

[Jay Steele <jsteele@xradia.com>]

Hi Tim,

     After reviewing saveData.c, I realize that PREFIX_SIZE is set to 10, and I'm using the prefix "21:D3:BNP:". I guess that the leading ":" is being dropped off, so the record names set by saveData don't match the actual record names. This explains the following message I get after saveData_Init().

 

saveData: Can't connect to some or all retry PVs

 

     I think this explains why the scan is failing to write out the records.

 

     Why do we need to have such a short prefix (PREFIX_SIZE = 10) for saveData? Can I just increase PREFIX_SIZE and recompile?

 

Thanks,

Jay Steele

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From: Jay Steele
Sent: Tuesday, November 02, 2010 3:51 PM
To: Tim Mooney
Cc: tech-talk@aps.anl.gov
Subject: RE: write failure occuring in writeScanRecInProgress function (after writing header) in saveData.c (sscan-2-6-6 module)

Hi Tim,

    The function is exiting out of this block of code (I added the printf("write failed\n") line).

 

****************************************************************

if (pscan->old_npts < pscan->npts) {
  writeFailed |= !xdr_setpos(&xdrs, pscan->dims_offset);
  Debug3(2, "saveData:writeScanRecInProgress:(%s) scan_dim=%d, dims_offset=%ld\n",
   pscan->name, pscan->scan_dim, pscan->dims_offset);
  if (writeFailed) {
            printf("write failed\n");
            goto cleanup;
        }
  lval = pscan->npts;
  writeFailed |= !xdr_long(&xdrs, &lval);
 }

*****************************************************************

 

Cheers,

Jay Steele

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From: Tim Mooney [mooney@aps.anl.gov]
Sent: Tuesday, November 02, 2010 3:47 PM
To: Jay Steele
Cc: tech-talk@aps.anl.gov
Subject: Re: write failure occuring in writeScanRecInProgress function (after writing header) in saveData.c (sscan-2-6-6 module)

Jay,
The next thing saveData wants to do, after the last message you've shown,
 is to call xdr_setpos(), and I'm pretty sure this will be its first  call to xdr_setpos()
for the file.  I'll guess xdr_pos() is returning an error (zero).  Can you check to see
if this is true?

Tim Mooney

Jay Steele wrote:

Hi EPICS tech-talk,

     I'm having a problem executing my first simple 1D scan here at XRadia. I set up the scan as simply as I could - with one positioner and one data source (SIS 3820 board with input to channel #9 from a signal generator). I am using TPMAC records (e.g., bkgfix1pcs_scanrec_v3.db and AssyGeneric_scanrec_v3.db to set up records) for the positioner. I verified that the SIS 3820 record works to count the pulses from the signal generator, and also that I can move the motor simply by setting 21:D3:BNP:XY:PX:RqsPos. I start the scan and the vxWorks terminal reports the following (with debug_saveData =10, debug_saveDataMsg=10) and keeps trying to write to the scan file without success. Attached is a screen shot of the MEDM interface for the scan. I'm using epics-3-14-11 with VxWorks and compiling with cygwin on windows-x86.

 

saveDataTask: MSG_SCAN_PXNV, ix=0, val=2.000000
21:D3:BNP:scan1 MSG_SCAN_PXNV(2)= 0.000000
saveDataTask: MSG_SCAN_PXNV, ix=0, val=0.000000
21:D3:BNP:scan1 MSG_SCAN_PXNV(0)= 0.000000
saveDataTask: MSG_DESC, val=
MSG_DESC()= 0.000000

 nb_scan_running=1
saveDataTask: MSG_SCAN_DATA, val=0
proc_scan_data(21:D3:BNP:scan1):entry:pmsg->val=0
scan started: 21:D3:BNP:scan1
Checking number of valid positioner
Checking number of valid detector
Checking number of valid trigger
Outermost scan
proc_scan_data(21:D3:BNP:scan1):New file
saveData: stat returned -1 for filename '/data/Nov-1-2010/test_0008.mda'; errno=
3145730
saveData:writeScanRecInProgress: Opening file '/data/Nov-1-2010/test_0008.mda'
saveData:writeScanRecInProgress: Writing file header
saveData:writeScanRecInProgress: scan_dim=1
saveData:writeScanRecInProgress:(21:D3:BNP:scan1) scan_dim=1, dims_offset=0
saveData:writeScanRecInProgress: File Header written
saveData:writeScanRecInProgress: Writing per-scan header
saveData:writeScanRecInProgress: Save scan info
saveData:writeScanRecInProgress: Pos[0] info
saveData:writeScanRecInProgress: Det[0] info
saveData:writeScanRecInProgress: Trg[0] info
saveData:writeScanRecInProgress: Allocate space for Pos[0]
saveData:writeScanRecInProgress: Allocate space for Det[0]
saveData:writeScanRecInProgress:(21:D3:BNP:scan1) scan_dim=1, dims_offset=0

    

     From this output, I tracked the problem down to a write failure in the writeScanRecInProgress function in saveData.c. This occurs after the function writes out the file header and allocates space for Pos[0] and Det[0].

 

     I'm confused why there would be a write failure at this point. Can anybody determine from this problem what might be wrong with my setup to cause this problem?

 

Thanks,

Jay Steele

XRadia Corporation

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-- 
Tim Mooney (mooney@aps.anl.gov) (630)252-5417
Software Services Group (www.aps.anl.gov)
Advanced Photon Source, Argonne National Lab

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