tfc_say(" -O opts: set options (comma separated list):");
tfc_say(" sync: request a synchronous I/O for a output,");
tfc_say(" fsync: on each write() call a corresponding fsync(fd),");
tfc_say(" -O opts: set options (comma separated list):");
tfc_say(" sync: request a synchronous I/O for a output,");
tfc_say(" fsync: on each write() call a corresponding fsync(fd),");