Figure 4. I/O rates for all PEs accessing a single file using CRAY global file feature. The direct access with record number reaches about 110MB/s on 32 and 64 PEs, whereas the sequential access with set file position remain at 10MB/s range. Each PE has a fixed 32MB portion of the file while the global file size increases accordingly as number of PEs increases. File is striped over 16 disk partitions.