On 11/24/20 11:27 AM, Jan Gorecki wrote:
Thanks Bill for checking that.
It was my impression that warnings are raised from some internal
system calls made when quitting R. At that point I don't have much
control over checking the return status of those.
Your suggestion looks good to me.
Tomas, do you think this could help? could this be implemented?
I think this is a good suggestion. Deleting files on Unix was changed
from system("rm") to doing that in C, and deleting the session directory
should follow.
It might also help diagnosing your problem, but I don't think it would
solve it. If the diagnostics in R works fine and the OS was so
hopelessly out of memory that it couldn't run any more external
processes, then really this is not a problem of R, but of having
exhausted the resources. And it would be a coincidence that just this
particular call to "system" at the end of the session did not work.
Anything else could break as well close to the end of the script. This
seems the most likely explanation to me.
Do you get this warning repeatedly, reproducibly at least in slightly
different scripts at the very end, with this warning always from quit()?
So that the "call" part of the warning message has .Internal(quit) like
in the case you posted? Would adding another call to "system" before the
call to "q()" work - with checking the return value? If it is always
only the last call to "system" in "q()", then it is suspicious, perhaps
an indication that some diagnostics in R is not correct. In that case, a
reproducible example would be the key - so either if you could diagnose
on your end what is the problem, or create a reproducible example that
someone else can use to reproduce and debug.
Best
Tomas
On Mon, Nov 23, 2020 at 7:10 PM Bill Dunlap <williamwdun...@gmail.com> wrote:
The call to system() probably is an internal call used to delete the session's
tempdir(). This sort of failure means that a potentially large amount of disk
space is not being recovered when R is done. Perhaps R_CleanTempDir() could
call R_unlink() instead of having a subprocess call 'rm -rf ...'. Then it
could also issue a specific warning if it was impossible to delete all of
tempdir(). (That should be very rare.)
q("no")
Breakpoint 1, R_system (command=command@entry=0x7fffffffa1e0 "rm -Rf
/tmp/RtmppoKPXb") at sysutils.c:311
311 {
(gdb) where
#0 R_system (command=command@entry=0x7fffffffa1e0 "rm -Rf /tmp/RtmppoKPXb") at
sysutils.c:311
#1 0x00005555557c30ec in R_CleanTempDir () at sys-std.c:1178
#2 0x00005555557c31d7 in Rstd_CleanUp (saveact=<optimized out>, status=0,
runLast=<optimized out>) at sys-std.c:1243
#3 0x00005555557c593d in R_CleanUp (saveact=saveact@entry=SA_NOSAVE,
status=status@entry=0, runLast=<optimized out>) at system.c:87
#4 0x00005555556cc85e in do_quit (call=<optimized out>, op=<optimized out>,
args=0x555557813f90, rho=<optimized out>) at main.c:1393
-Bill
On Mon, Nov 23, 2020 at 3:15 AM Tomas Kalibera <tomas.kalib...@gmail.com> wrote:
On 11/21/20 6:51 PM, Jan Gorecki wrote:
Dear R-developers,
Some of the more fat scripts (50+ GB mem used by R) that I am running,
when they finish they do quit with q("no", status=0)
Quite often it happens that there is an extra stderr output produced
at the very end which looks like this:
Warning message:
In .Internal(quit(save, status, runLast)) :
system call failed: Cannot allocate memory
Is there any way to avoid this kind of warnings? I am using stderr
output for detecting failures in scripts and this warning is a false
positive of a failure.
Maybe quit function could wait little bit longer trying to allocate
before it raises this warning?
If you see this warning, some call to system() or system2() or similar,
which executes an external program, failed to even run a shell to run
that external program, because there was not enough memory. You should
be able to find out where it happens by checking the exit status of
system().
Tomas
Best regards,
Jan Gorecki
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