readme.cheetah

RISC处理器仿真分析程序。可以用于研究通用RISC处理器的指令和架构设计。在linux下编译

                         caches of varying line sizes but constant
                         size need to be simulated. Direct-mapped
                         caches of varying sizes may be simulated by
                         setting the configuration to set-associative
                         and the maximum associativity to one.

               The default configuration is sa.

          -F format
               Used to specify the trace format. Currently, the trace
               format can be one of

               pixie     Trace as generated by pixie.

               din       Trace in the DIN format (Mark Hill).

               basic     Trace is a sequence of four byte addresses.

               The default format is basic.

          -T type



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     cheetah(1)                                             cheetah(1)



               Used to specify the trace type.  i[nstruction] for
               instruction traces, d[ata] for data traces and
               u[nified] for unified instruction and data traces may
               be specified. This option is ignored for the basic
               trace format.  The default trace type is unified.

          Along with the above four major options, for each
          configuration a set of options are recognized that serve to
          set various parameter values.  Options that are valid for
          all configurations are first described, followed by the
          specific options for each of the three configurations.

          The following options are used for all configurations and
          set the input/output files and other global simulation
          parameters.

          -t number
               Specifies an upper limit on the number of addresses
               processed (default 1 billion).

          -f file
               Specifies the input file (default stdin).

          -o file
               Specifies the output file (default stdout).

          -p number
               Specifies the intervals at which simulation progress
               should be printed.  Useful for checking the status of
               the simulation (default 10 million).

          -s number
               Specifies the intervals at which intermediate results
               should be saved to the output file.

          The following options are used when the configuration is
          set-associative to set parameter values and ranges.  All
          logs are to base 2.

          -a number
               Specifies the log of the minimum number of sets
               (default 7).

          -b number
               Specifies the log of the maximum number of sets
               (default 14).

          -l number
               Specifies the log of the line size of the caches
               (default 4).

          -n number



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     cheetah(1)                                             cheetah(1)



               Specifies the log of the maximum degree of
               associativity (default 1).

          The following options are used when the configuration is
          fully-associative to set parameter values.

          -l number
               Specifies the log of the line size of the caches
               (default 4).

          -i number
               Specifies the cache size intervals at which the miss
               ratio is desired If this is less than the line size it
               is set to the line size (default 512 bytes).

          -M number
               Specifies the maximum cache size of interest.  When the
               contents of the stack go beyond this limit entries are
               deleted from the bottom of the stack. This is primarily
               to avoid thrashing (default 512 Kbytes).

          The following options are used when the configuration is
          direct-mapped to set parameter values

          -a number
               Specifies the log of the minimum line size (default 7).

          -b number
               Specifies the log of the maximum line size (default
               14).

          -c number
               Specifies the log of the cache size (default 16).

     EXAMPLE
          cheetah -C sa -F basic -T u -R lru -a 5 -b 14 -l 4 -n 2 -t 1000000
          -f tfile -o results

          Determines the miss ratios of set-associative caches with
          number of sets ranging from 32 (2^5) to 16384 (2^14), and
          associativities ranging from 1 to 4 (2^2), with a line size
          of 16 (2^4) bytes.  The input trace format is basic and is
          read from the file tfile. A unified instruction and data
          cache is simulated on the first 1 million addresses in the
          trace.  The output is written to the file results.

     BUGS
          Currently, cheetah cannot handle traces that are longer than
          2^31 addresses.

          With OPT replacement, the memory requirement is not bounded,
          and thrashing might occur with some traces.



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     cheetah(1)                                             cheetah(1)



          The conversion routine for DIN traces is simple and not very
          efficient.  If you use DIN traces often it would help to
          make this routine more efficient.

          The package has not been thoroughly debugged on 64-bit
          architectures such as the KSR and the DEC Alpha.

     AUTHORS
          Rabin A. Sugumar ([e-mail]) and Santosh G.
          Abraham ([e-mail]), The University of Michigan.

     SEE ALSO
          pixie (1), dineroIII ()

          Rabin A. Sugumar and Santosh G. Abraham, ``Efficient
          Simulation of Caches using Binomial Trees'', Technical
          Report CSE TR-111-91, University of Michigan, 1991.

          Rabin A. Sugumar and Santosh G. Abraham, ``Efficient
          Simulation of Caches under OPT replacement with Applications
          to Miss Characterization,'' in the proceedings of the 1993
          ACM SIGMETRICS Conference.

































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