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visits member for 2 years
seen Jun 2 at 22:13

I am M.Sc graduate of Computer Architecture at University of Tehran, Tehran, Iran. I enjoy learning/helping from/to others.


Jul
2
awarded  Curious
May
31
awarded  Notable Question
Sep
14
awarded  Yearling
Sep
3
awarded  Popular Question
Dec
27
accepted Execution time differs for different users
Dec
25
comment Execution time differs for different users
@JohnSiu BATCH runs the R in non-interactive and reads from a file. Anyway, I guess the problem is about some environment variables in bash. Many thanks.
Dec
25
comment Execution time differs for different users
@JohnSiu I have no idea! Unfortunately, it is the R application not mine.
Dec
24
comment Execution time differs for different users
I've tracked the strace for root and john. The outputs are the same (expect the process-ids), but john stalls on wait4. root continues and prints a few lines until the end of R execution. I cannot dump all the log here in comments, but just where john stalls, the root user continues and calls rt_sigprocmask, rt_sigreturn, rt_sigaction, read, and exit_group functions.
Dec
24
comment Execution time differs for different users
Many thanks! very interesting, it hangs and the last printed line is wait4(-1, . So I should see what is the wait4.
Dec
24
comment Execution time differs for different users
Thank! But no luck! root and john have the same limitations (added into the question). Any other idea? :(
Dec
24
revised Execution time differs for different users
added 1717 characters in body
Dec
24
comment Execution time differs for different users
But what kinds of limitation can be the reason?
Dec
24
asked Execution time differs for different users
Nov
25
accepted Timely automatic unexpected reboot on ubuntu desktop
Nov
24
comment Ubuntu webserver is out of space
can you show the size of directories under /? use cd / ; du --max-depth=1 -h.
Nov
24
asked Timely automatic unexpected reboot on ubuntu desktop
Nov
15
accepted Quota: apply the same limit to all individual users of a group
Nov
15
asked Quota: apply the same limit to all individual users of a group
Nov
13
revised Linux: Finding the system processes which are at the top
added 2 characters in body
Nov
13
accepted Linux: Finding the system processes which are at the top