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13966 :: Taskpool Upgrade throws value error

• ajaychat3 (orginal) [2026-06-07T03:53:58+02:00] view original

  I have been using taskpools for parallel processing. Recently I updated taskpools v0.0.4 to taskpools v0.1.0 and now my nim program throws a value error. It was working till yesterday before update.I am unable to understand the reason for this. Here is the nim script and error

  
  import ./Model_V16.nim
  import taskpools, cpuinfo
  var
    dfile: string = ""
    sDateP1: string = "31/03/2023" # for NB Run
    sDateP: string = "31/03/2025"
    sDateC: string = "31/03/2026"
    dates: seq[string]
  
  dfile = "../Data/Data_Curr_F.csv"
  dates = @[sDateP1, sDateP, sDateC]
  
  # with eb_nb=1, indv = 2 and c_oner = 1 a new file can be written with onerous indicator for individual records
  # choose run  from 1 to 8 for sensitivity
  
  proc liabApprox(tp: Taskpool, n: int, ebnb: int): int =
    var pendingFuts = newSeq[Flowvar[int]](n)
    
    if ebnb == 1:
      for k in 0..(n-1):
        pendingFuts[k] = tp.spawn val_run(run = k, eb_nb = ebnb, indv = 0,
            c_oner = 0, dfile, dates, expvar = 0, err_check = 0)
    elif ebnb == 0:
      for k in 0..(n-1):
        pendingFuts[k] = tp.spawn val_run(run = k, eb_nb = ebnb, indv = 0,
            c_oner = 0, dfile, dates, expvar = 0, err_check = 0)
    
    result = n
  
  proc main() =
    var ebnb = 0
    var n = 1
    if ebnb == 1:
      n = 1
    # var nthreads = countProcessors()
    var tp = Taskpool.new(num_threads = n) # Default to the number of hardware threads.
    echo tp.liabApprox(n, ebnb)
    # tp.syncAll()
    # Block until all pending tasks are processed (implied in tp.shutdown())
    tp.shutdown()
  
  
  main()
  Run

  Here is the error on compilation of program

  
  nim c --opt:speed --hints:on --d:release --styleCheck:usages --styleCheck:hint --threads:on  -r "2024_CA.nim" (in directory: /home/ajayc/Documents/Work/IFRS/CALI/Mar_26/WorkSpace)
  Hint: used config file '/etc/nim/nim.cfg' [Conf]
  Hint: used config file '/etc/nim/config.nims' [Conf]
  ....................................................................................................
  /home/ajayc/.nimble/pkgs2/nimblas-0.3.1-e1ecdea4bb8176f12d66efd4aa0c7b3bea970027/nimblas/private/common.nim(52, 7) Hint: Using BLAS library matching pattern: lib(blas|cblas|openblas).so(|.3|.2|.1|.0) [User]
  ........................................................................................................................................................................
  /home/ajayc/.nimble/pkgs2/nimlapack-0.3.1-fcb25795c6fb43f9251b7f34c3ad84c39e645afd/nimlapack.nim(20, 7) Hint: Using LAPACK library matching pattern: liblapack.so(|.3|.2|.1|.0) [User]
  .................................................................
  /Documents/Work/IFRS/CALI/Mar_26/WorkSpace/IFRS_Model_V16.nim(67, 30) Hint: 'parseint' should be: 'parseInt' [func declared in /usr/lib/nim/lib/pure/strutils.nim(1151, 6)] [Name]
  /Documents/Work/IFRS/CALI/Mar_26/WorkSpace/IFRS_Model_V16.nim(82, 9) Hint: 'repYr' should be: 'repyr' [var declared in /Documents/Work/IFRS/CALI/Mar_26/WorkSpace/IFRS_Model_V16.nim(67, 9)] [Name]
  /Documents/Work/IFRS/CALI/Mar_26/WorkSpace/IFRS_Model_V16.nim(82, 17) Hint: 'repYr' should be: 'repyr' [var declared in /Documents/Work/IFRS/CALI/Mar_26/WorkSpace/IFRS_Model_V16.nim(67, 9)] [Name]
  /Documents/Work/IFRS/CALI/Mar_26/WorkSpace/IFRS_Model_V16.nim(566, 66) Hint: 'vGen' should be: 'vGEN' [var declared in /Documents/Work/IFRS/CALI/Mar_26/WorkSpace/IFRS_Model_V16.nim(129, 30)] [Name]
  /Documents/Work/IFRS/CALI/Mar_26/WorkSpace/IFRS_Model_V16.nim(1260, 66) Hint: 'vDB_iFCF_t' should be: 'vDB_ifCF_t' [var declared in /Documents/Work/IFRS/CALI/Mar_26/WorkSpace/IFRS_Model_V16.nim(102, 36)] [Name]
  /Documents/Work/IFRS/CALI/Mar_26/WorkSpace/IFRS_Model_V16.nim(1261, 41) Hint: 'vExp_ifCF_t' should be: 'vEXP_ifCF_t' [var declared in /Documents/Work/IFRS/CALI/Mar_26/WorkSpace/IFRS_Model_V16.nim(102, 49)] [Name]
  /Documents/Work/IFRS/CALI/Mar_26/WorkSpace/IFRS_Model_V16.nim(1261, 60) Hint: 'vPrem_IFCF_t' should be: 'vPrem_ifCF_t' [var declared in /Documents/Work/IFRS/CALI/Mar_26/WorkSpace/IFRS_Model_V16.nim(102, 9)] [Name]
  /Documents/Work/IFRS/CALI/Mar_26/WorkSpace/IFRS_Model_V16.nim(1234, 43) Hint: 'lra' is declared but not used [XDeclaredButNotUsed]
  /Documents/Work/IFRS/CALI/Mar_26/WorkSpace/IFRS_Model_V16.nim(103, 32) Hint: 'vDB_CF_t' is declared but not used [XDeclaredButNotUsed]
  /Documents/Work/IFRS/CALI/Mar_26/WorkSpace/IFRS_Model_V16.nim(103, 41) Hint: 'vMB_CF_t' is declared but not used [XDeclaredButNotUsed]
  /Documents/Work/IFRS/CALI/Mar_26/WorkSpace/IFRS_Model_V16.nim(103, 51) Hint: 'vEXP_CF_t' is declared but not used [XDeclaredButNotUsed]
  /Documents/Work/IFRS/CALI/Mar_26/WorkSpace/IFRS_Model_V16.nim(103, 61) Hint: 'vSV_CF_t' is declared but not used [XDeclaredButNotUsed]
  /Documents/Work/IFRS/CALI/Mar_26/WorkSpace/IFRS_Model_V16.nim(105, 103) Hint: 'vPV_FCF_t' is declared but not used [XDeclaredButNotUsed]
  ..................
  /Documents/Work/IFRS/CALI/Mar_26/WorkSpace/IFRS_2024_CA.nim(25, 26) template/generic instantiation of `spawn` from here
  /home/ajayc/.nimble/pkgs2/taskpools-0.1.0-09e1b2fdad55b973724d61227971afc0df0b7a81/taskpools/taskpools.nim(502, 70) template/generic instantiation of `toTask` from here
  /home/ajayc/.nimble/pkgs2/taskpools-0.1.0-09e1b2fdad55b973724d61227971afc0df0b7a81/taskpools/tasks.nim(216, 65) template/generic instantiation from here
  /home/ajayc/.nimble/pkgs2/taskpools-0.1.0-09e1b2fdad55b973724d61227971afc0df0b7a81/taskpools/tasks.nim(119, 20) Error: taskpool_val_run(run_570425667, eb_nb_570425669, indv_570425671, c_oner_570425673,   dfile_570425675, dates_570425677, expvar_570425679, err_check_570425681,
                   fut_570425683) can raise an unlisted exception: ValueError
  Compilation failed.
  Run

  The last line of error is listing fut_570425683 as parameter although it is not part of the proc val_run().

  Please help to resolve this.

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• janAkali (orginal) [2026-06-07T06:24:46+02:00] view original

  It was working till yesterday before update.

  Somewhere between 0.0.4 and 0.1.0 taskpools library was updated to check exceptions more strictly, e.g. see this commit: https://github.com/status-im/nim-taskpools/commit/20677645212a544007763cb99c9faca10db657d6

  pendingFuts[k] = tp.spawn val_run(run = k, eb_nb = ebnb, indv = 0,

  c_oner = 0, dfile, dates, expvar = 0, err_check = 0)

  You should make sure that val_run cannot raise, handle all possible exceptions with try except.

  
  import pkg/taskpools
  
  proc foo(n: int): float =
    if n > 100: raise new ValueError
    return 42
  
  proc fooSafe(n: int): float {.raises: [].}=
    try:
      if n > 100: raise new ValueError
    except ValueError:
      return -1
    return 42
  
  proc main() =
    var tp = Taskpool.new(num_threads = 4)
    
    echo sync tp.spawn foo(1)     # can raise -> error
    echo sync tp.spawn fooSafe(1) # cannot raise -> works
    
    tp.syncAll()
    tp.shutdown()
  
  main()
  Run

  The last line of error is listing fut_570425683 as parameter although it is not part of the proc val_run().

  Taskpools' spawn is a macro that rewrites your proc, taskpool_val_run is a generated procedure.

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