Dear expeRts,

I've been using sucessfully multi-processor functionalities from the package BiocParallel on Windows. Now I'm experiencing a problem on Ubuntu-Linux (18.04 LTS) :

Since my functions didn't work, I realized that even the quick-start example from the "Introduction to BiocParallel" vignette doesn't work on my Linux. Any suggestions what I've been missing ?

Thank's in advance, Wolfgang

> library(BiocParallel)
> 
> FUN <- function(x) { round(sqrt(x), 4) }
> 
> options(MulticoreParam=quote(MulticoreParam(workers=4)))
>
> bpparam()
MulticoreParam(workers = 4)
>
>
> bplapply(1:4, FUN)
Error in (function (classes, fdef, mtable)  : 
  unable to find an inherited method for function ‘bplapply’ for signature ‘"integer", "call"’
>
>
> registered()
$MulticoreParam
class: MulticoreParam
  bpisup: FALSE; bpnworkers: 3; bptasks: 0; bpjobname: BPJOB
  bplog: FALSE; bpthreshold: INFO; bpstopOnError: TRUE
  bpRNGseed: ; bptimeout: 2592000; bpprogressbar: FALSE
  bpexportglobals: TRUE
  bplogdir: NA
  bpresultdir: NA
  cluster type: FORK

$SnowParam
class: SnowParam
  bpisup: FALSE; bpnworkers: 6; bptasks: 0; bpjobname: BPJOB
  bplog: FALSE; bpthreshold: INFO; bpstopOnError: TRUE
  bpRNGseed: ; bptimeout: 2592000; bpprogressbar: FALSE
  bpexportglobals: TRUE
  bplogdir: NA
  bpresultdir: NA
  cluster type: SOCK

$SerialParam
class: SerialParam
  bpisup: FALSE; bpnworkers: 1; bptasks: 0; bpjobname: BPJOB
  bplog: FALSE; bpthreshold: INFO; bpstopOnError: TRUE
  bpRNGseed: ; bptimeout: 2592000; bpprogressbar: FALSE
  bpexportglobals: TRUE
  bplogdir: NA
  bpresultdir: NA

> 
>
> sessionInfo()
R version 4.0.2 (2020-06-22)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Ubuntu 18.04.5 LTS

Matrix products: default
BLAS:   /usr/lib/x86_64-linux-gnu/blas/libblas.so.3.7.1
LAPACK: /usr/lib/x86_64-linux-gnu/lapack/liblapack.so.3.7.1

locale:
 [1] LC_CTYPE=fr_FR.UTF-8       LC_NUMERIC=C              
 [3] LC_TIME=fr_FR.UTF-8        LC_COLLATE=fr_FR.UTF-8    
 [5] LC_MONETARY=fr_FR.UTF-8    LC_MESSAGES=fr_FR.UTF-8   
 [7] LC_PAPER=fr_FR.UTF-8       LC_NAME=C                 
 [9] LC_ADDRESS=C               LC_TELEPHONE=C            
[11] LC_MEASUREMENT=fr_FR.UTF-8 LC_IDENTIFICATION=C       

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] BiocParallel_1.22.0

loaded via a namespace (and not attached):
[1] compiler_4.0.2 parallel_4.0.2
>

Try to set the option without quote()

> options(MulticoreParam=quote(MulticoreParam(workers=4)))
> bpparam()
MulticoreParam(workers = 4)
> res = bplapply(1:3, sqrt)
Error in (function (classes, fdef, mtable)  :
  unable to find an inherited method for function 'bplapply' for signature '"integer", "call"'
> options(MulticoreParam=MulticoreParam(workers=4))
> bpparam()
class: MulticoreParam
  bpisup: FALSE; bpnworkers: 4; bptasks: 0; bpjobname: BPJOB
  bplog: FALSE; bpthreshold: INFO; bpstopOnError: TRUE
  bpRNGseed: ; bptimeout: 2592000; bpprogressbar: FALSE
  bpexportglobals: TRUE
  bplogdir: NA
  bpresultdir: NA
  cluster type: FORK   
> res = bplapply(1:3, sqrt)
>