c - Bash 没有这样的文件或目录错误(缓存模拟器)

Question

我正在设计一个缓存模拟器来计算未命中、命中、驱逐的数量。我尝试使用以下命令编译我的程序，它运行良好，没有任何错误，

Program
#include <stdlib.h>
#include <stdio.h>
#include <getopt.h>
#include <strings.h>
#include <limits.h>

//#include "cachelab.h"

/* Always use a 64-bit variable to hold memory addresses*/
typedef unsigned long long int mem_addr_t;

 /* a struct that groups cache parameters together */
typedef struct
{
int s;                       /* 2**s cache sets */
int b;                       /* cacheline block size 2**b bytes */
int E;                       /* number of cachelines per set */
int S;                       /* number of sets, derived from S = 2**s */
int B;                       /* cacheline block size (bytes), derived from B = 2**b */
} cache_param_t;

int verbosity;

/* printUsage - Print usage info */
void printUsage( char *argv[] )
{
printf( "Usage: %s [-hv] -s <num> -E <num> -b <num> -t <file>\n", argv[0] );
printf( "Options:\n" );
printf( "  -h         Print this help message.\n" );
printf( "  -v         Optional verbose flag.\n" );
printf( "  -s <num>   Number of set index bits.\n" );
printf( "  -E <num>   Number of lines per set.\n" );
printf( "  -b <num>   Number of block offset bits.\n" );
printf( "  -t <file>  Trace file.\n" );
printf( "\nExamples:\n" );
printf( "  %s -s 4 -E 1 -b 4 -t traces/yi.trace\n", argv[0] );
printf( "  %s -v -s 8 -E 2 -b 4 -t traces/yi.trace\n", argv[0] );
exit( 0 );
}

void printSummary( int hit_count, int miss_count, int eviction_count )
{
printf( "hits: %d   misses: %d   evictions: %d\n", hit_count, miss_count, eviction_count );
} 

int main( int argc, char **argv )
{
cache_param_t par;

bzero( &par, sizeof ( par ) );

char *trace_file;
char c;

while ( ( c = getopt( argc, argv, "s:E:b:t:vh" ) ) != -1 )
{
  switch ( c )
  {
     case 's':
        par.s = atoi( optarg );
        break;
     case 'E':
        par.E = atoi( optarg );
        break;
     case 'b':
        par.b = atoi( optarg );
        break;
     case 't':
        trace_file = optarg;
        break;
     case 'v':
        verbosity = 1;
        break;
     case 'h':
        printUsage( argv );
        exit( 0 );
     default:
        printUsage( argv );
        exit( 1 );
  }
}

if ( par.s == 0 || par.E == 0 || par.b == 0 || trace_file == NULL )
{
  printf( "%s: Missing required command line argument\n", argv[0] );
  printUsage( argv );
  exit( 1 );
}

/* TODO: Compute S and B based on information passed in */

//Compute S and B, 2^s and 2^b respectively
par.S = ( 1 << par.s );
par.B = ( 1 << par.b );

/* TODO: Initialize a cache */

//Structure for a line
typedef struct
{
  int valid;
  mem_addr_t tag;
  int timestamp;
} line_st;

//Structure for a set; a pointer to an array of lines
typedef struct
{
  line_st *lines;
} cache_set;

//Structure for a cache; a pointer to an array of sets
typedef struct
{
  cache_set *sets;
} cache_t;

//allocate space for sets and for lines
cache_t cache;
int i;

cache.sets = malloc( par.S * sizeof ( cache_set ) );
for (i = 0; i < par.S; i++ )
{
  cache.sets[i].lines = malloc( sizeof ( line_st ) * par.E );
}

//counters
int hit_count = 0;
int miss_count = 0;
int eviction_count = 0;

/* TODO: Run the trace simulation */

char act;                    //L,S,M
int size;                    //size read in from file
int TSTAMP = 0;              //value for LRU
int empty = -1;              //index of empty space
int H = 0;                   //is there a hit
int E = 0;                   //is there an eviction
int e;
mem_addr_t addr;

//open the file and read it in
FILE *traceFile = fopen( trace_file, "r" );

if ( traceFile != NULL )
{
  while ( fscanf( traceFile, " %c %llx,%d", &act, &addr, &size ) == 3 )
  {
     int toEvict = 0;             //keeps track of what to evict
     if ( act != 'I' )
     {
        //calculate address tag and set index
        mem_addr_t addr_tag = addr >> ( par.s + par.b );
        int tag_size = ( 64 - ( par.s + par.b ) );
        unsigned long long temp = addr << ( tag_size );
        unsigned long long setid = temp >> ( tag_size + par.b );
        cache_set set = cache.sets[setid];
        int low = INT_MAX; // CHANGED, also added #include <limits.h>

        for (e = 0; e < par.E; e++ ) {
           if ( set.lines[e].valid == 1 ) {
              // CHANGED ORDER: look for hit before eviction candidates
              if ( set.lines[e].tag == addr_tag ) {
                 hit_count++;
                 H = 1;
                 set.lines[e].timestamp = TSTAMP;
                 TSTAMP++;
              }
              // CHANGED WHOLE ELSE: look for oldest for eviction.
              else if ( set.lines[e].timestamp < low ) {
                 low = set.lines[e].timestamp;
                 toEvict = e;
              }
           }
           // CHANGED: if we haven't yet found an empty, mark one that we found.
           else if( empty == -1 ) {
              empty = e;
           }
        }

        //if we have a miss
        if ( H != 1 )
        {
           miss_count++;
           //if we have an empty line
           if ( empty > -1 )
           {
              set.lines[empty].valid = 1;
              set.lines[empty].tag = addr_tag;
              set.lines[empty].timestamp = TSTAMP;
              TSTAMP++; 
           }
           //if the set is full we need to evict
           else if ( empty < 0 )
           {
              E = 1;
              set.lines[toEvict].tag = addr_tag;
              set.lines[toEvict].timestamp = TSTAMP;
              TSTAMP++; // CHANGED: increment TSTAMP here too
              eviction_count++;
           }
        }
        //if the instruction is M, we will always get a hit
        if ( act == 'M' )
        {
           hit_count++;
        }
        //if the -v flag is set print out all debug information
        if ( verbosity == 1 )
        {
           printf( "%c ", act );
           printf( "%llx,%d", addr, size );
           if ( H == 1 )
           {
              printf( "Hit " );
           }
           else if ( H != 1 )
           {
              printf( "Miss " );
           }
           if ( E == 1 )
           {
              printf( "Eviction " );
           }
           // CHANGED: don't print Hit again since 'M' is always going to print Hit above.
           printf( "\n" );
        }
        empty = -1;
        H = 0;
        E = 0;
     }
  }
}

   /* TODO: Clean up cache resources */

/* TODO: Print out real results */
printSummary( hit_count, miss_count, eviction_count );
void printSummary(int hits, int misses, int evictions)
{
 printf("hits:%d misses:%d evictions:%d\n", hits, misses, evictions);
FILE* output_fp = fopen(".csim_results", "w");
fprintf(output_fp, "%d %d %d\n", hits, misses, evictions);
fclose(output_fp);
}
return 0;
}


Compile command
gcc -Wall hello.c -o hello.out -lm

But when i tried to execute the code i am getting the following error :

error while running the program
bash: ./hello:No such file or directory 

The command which i used to run is as follows 

Run command
./hello [hv] -s 5 -E 1 -b 5 -t traces/trans.trace

Expected output
Hits 231 Misses 7 Evictions 0

我很确定我在执行程序时设置的路径是正确的，但我无法找到遇到此问题的解决方案？帮帮我!!

Answer 1

您使用 gcc -Wall hello.c -o hello.out -lm 进行编译，因此您希望执行 ./hello.out。

如果您想使用 ./hello 运行，请使用以下行进行编译:

gcc -Wall hello.c -o hello -lm