Download e-book for iPad: Architecture of High Performance Computers: Volume I by R. N. Ibbett, N. P. Topham (auth.)

By R. N. Ibbett, N. P. Topham (auth.)

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Extra info for Architecture of High Performance Computers: Volume I Uniprocessors and vector processors

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2 The System/370 Model 165 cache The Model 85 cache is characterised by having a relatively small number of fairly large contiguous units of buffer store. While this can perform weil in a single program environment, it is unlikely to do so in a multi-access multiprogramming environment where rapid switching between a number of store co-resident programs is essential. What is needed in these circumstances is a relatively large number of (necessarily) small contiguous units of buffer store. Smaller versions of the Model 165, for example, have 8-Kbyte cache stores consisting of 256 blocks each of 32 bytes.

7) provides a set ofparallel inputs to the OR gate and each is connected, via its own buffer register, to the output of this OR gate. The Exchange operates by time aharing the OR gate between the units. Thus the transfer of a block of words from the Fixed-head Disc Unit to the MUS Local Store, for example, involves a succession of 64-bit word transfers from the Disc, as Sending Unit, to the Local Store as Receiving Unit, with the OR gate connecting these units for 46 Architecture of High Performance Computers - Volume I the duration of each ward transfer rather than for the whole duration of the block transfer.

6 The Name Store non-equitJalence routine In the case where OBS indicates that the required store word is in its Name Store, then if all 64 bits are to be overwritten by a store order, the store word is not actually returned to PROP. In this case OBS simply deletes its copy and PROP assumes it to have arrived immediately, thereby reducing the non-equivalence delay time. In cases where the operand is not deleted from the OBS Name Store, the only further action required in PROPis the restoration of PLR and IN before the routine is complete2 • If 2 The clearing of a line earlier in the routine only copies its contents back to the Local Store and sets the line tobe unaltered, so the Name Store iB not disturbed.

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