It wasn’t enough to impact results, but it was enough to cause questioning my results (and sanity).
Part of the IO operation is having N processes write to 1 file. To make this happen correctly, each process has to compute their offset into the file, and start operations from there.
There is a seek involved. Now if I am smart, it won’t be
Nope … that would be wrong (the zero).
Having the line like this would mean that 128 GB sized files … might not look like 256 GB sized files.
[root@jr5 ~]# ls -alF /data/file -rwx------ 1 root root 274877906944 Jul 21 20:43 /data/file*