Hi Everybody,
I want to use MPI hints to create a striped file across a subset of
the pvfs2 servers. For that I use, the hints "striping_unit" and
"striping_factor". I have a set of three I/O servers. However, I want
to create the file only on one I/O server. I specified "striping_unit"
= 65536 and "striping_factor" = 1. However, after the file is created,
I get the following results:
pvfs2-viewdist -f /home/mdl/patrick/pvfs2/oneserver
dist_name = simple_stripe
dist_params:
strip_size:65536
Metadataserver: tcp://aum14:7000
Number of datafiles/servers = 3
Datafile 0 - tcp://aum15:7000, handle: 9223372036854775298
(7ffffffffffffe02.bstream)
Datafile 1 - tcp://aum13:7000, handle: 4611686018427387650
(3fffffffffffff02.bstream)
Datafile 2 - tcp://aum14:7000, handle: 4611686018427387905
(4000000000000001.bstream)
Am I missing something? I wanted to use this hint, so that I don't
have to reconfigure the servers everytime, I want to change the number
of I/O servers.
Could somebody please help me?
Thanks and Regards,
Christina.
PS: The extract from my program which does this:
79 MPI_Info_create(&file_info);
80
81 if(argc > 1) {
82 stripe_unit = atoi(argv[1]);
83 sprintf(stripe_unit_str, "%d", stripe_unit);
84 MPI_Info_set(file_info, "striping_unit", stripe_unit_str);
85 }
86
87 if(argc > 2) {
88 stripe_factor = atoi(argv[2]);
89 sprintf(stripe_factor_str, "%d", stripe_factor);
90 MPI_Info_set(file_info, "striping_factor", stripe_factor_str);
91 }
92
93 MPI_File_open(MPI_COMM_WORLD, fname, MPI_MODE_CREATE |
MPI_MODE_WRONLY, file_info, &fhandle);
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