Is openmp writing to the disk thread safe?

Question

My C++ program pseudo code looks like:

#omp pragma parallel
for (i=1...100000)
  write input files into a file called "$i.txt", $i is the value of i
  then do ./outside_program $i.txt and reads its inputs and do other stuff

Assume ./outside_program is thread safe. Is using openmp to write to different files in C++ thread safe?

Probably thread safe but possibly a nightmare in performance terms as the threads contend for access to the read/write head. — High Performance Mark
– High Performance Mark, Commented Sep 3, 2015 at 20:21
It seems likely that the I/O operations will serialize in the kernel or something like that. — Jeff Hammond
– Jeff Hammond, Commented Sep 4, 2015 at 0:19

coincoin · Accepted Answer · 2015-09-03 19:51:44Z

1

If you are writing to different files I see no problem it is thread safe. The question is in fact not dependent of the multi-threading API you use. OpenMP, TBB, or other technology...

answered Sep 3, 2015 at 19:51

coincoin

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