Christina, you are using MPICH2 and the ad_pvfs2 romio module?
kevin On Jul 14, 2009, at 9:12 AM, Christina Patrick wrote:
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); _______________________________________________ Pvfs2-developers mailing list [email protected] http://www.beowulf-underground.org/mailman/listinfo/pvfs2-developers
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