?mccollect say
'mccollect' returns any results that are available in a list. The
results will have the same order as the specified jobs. If there
are multiple jobs and a job has a name it will be used to name the
result, otherwise its process ID will be used. If none of the
specified children are still running, it returns 'NULL'.
which does not seem to be true when wait=FALSE
> sleeper = function(i) mcparallel({ Sys.sleep(i); i }, i)
> p = lapply(1:2, sleeper); Sys.sleep(2); mccollect(p, wait=FALSE)
[[1]]
[1] 2
[[2]]
[1] 1
> p = lapply(1:2, sleeper); Sys.sleep(2); mccollect(p, wait=TRUE)
$`1`
[1] 1
$`2`
[1] 2
It would be programmatically convenient if mccollect returned a list
equal in length to it's first argument (except when all tasks are
complete), e.g., a length 2 named list with second element NULL rather than
> p = lapply(1:2, sleeper); Sys.sleep(1); mccollect(p, wait=FALSE)
[[1]]
[1] 1
> sessionInfo()
R Under development (unstable) (2012-08-18 r60311)
Platform: x86_64-unknown-linux-gnu (64-bit)
locale:
[1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C
[3] LC_TIME=en_US.UTF-8 LC_COLLATE=en_US.UTF-8
[5] LC_MONETARY=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8
[7] LC_PAPER=C LC_NAME=C
[9] LC_ADDRESS=C LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C
attached base packages:
[1] parallel stats graphics grDevices utils datasets methods
[8] base
other attached packages:
[1] BiocInstaller_1.5.12
loaded via a namespace (and not attached):
[1] tools_2.16.0
--
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