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• chef supports reading and writing restarts to and from memory

  Create a chef driver that: 1. reads a restart file and a mixed mesh and does tetrahedronization 2. writes new restart 'file' to memory 3. reads restart file from memory and does tetrahedronization 4. writes restart file to disk `diff` the resulting restart file against the input restart file. If all went well there should be no diff.

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• phIO supports both posix and sync IO

  Currently phIO, the wrapper layer between phSolver and phastaIO, only supports sync IO. phIO will be extended to support posix IO. 0. Create mechanism to switch between posix and sync io. In the long term we would want to register appropriate functions to satisfy the phIO interface. Given that the current phastaIO should support both sync and posix this may not be a ideal approach; we would register the same functions for both modes. 1. Implement string handling for posix and sync. File and field names are slightly different; e.g. `geombc-dat` vs `geombc.dat`, `connectivity interior1` vs `connectivity interior linear tetrahedron` . 2. Call the appropriate sequence of phastaIO fns to support posix in the phIO fns. - `phio_closefile_[read|write]` syncio needs `finalizephmpiio` called after `closefile` - `phio_openfile_read` syncio needs `queryphmpiio` and `initializephmpiio` called before `openfile` - `phio_openfile_write` syncio needs `initializephmpiio` called before `openfile` 3. Resolve read and write function call logic differences in `readnblk` and elsewhere.

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