When building the Lustre ADIO driver, one might run into a few problems. caddr_t problems: (” /usr/include/sys/quota.h:221: error: expected declaration specifiers or ‘…’ before ‘caddr_t’”) caddr_t is an old BSD-ism ‘FASYNC’ undeclared: another old BSD-ism ‘struct lov_user_md_v1’ has no member named ‘lmm_stripe_offset’ recent versions of lustre moved this member into an anonymous union. These errors …
ROMIO, in various forms, provides the MPI-IO implementation for just about every MPI implementation out there. These implementations incorporate ROMIO’s hints when they pick up our source code, but they also add additional tuning parameters via environment variables. The Intel MPI library uses ROMIO, but configures the file-system specific drivers a bit differently. in MPICH, …
ROMIO has a general-purpose file system driver we call “UFS” (for Unix File System). UFS contains no file-system-specific optimizations: just data sieving and two phase collective buffering. The generic approach works, in that it gives correct answers, but it has two big problems when writing to Lustre: When assigning the file domains, UFS simply takes …