SQLite

"        files in DIRECTORY.\n"
"\n"
"   kvhelp run DBFILE [options]\n"
"\n"
"        Run a performance test.  DBFILE can be either the name of a\n"
"        database or a directory containing sample files.  Options:\n"
"\n"
"             --asc                Read blobs in ascending order\n"
"             --blob-api           Use the BLOB API\n"
"             --cache-size N       Database cache size\n"
"             --count N            Read N blobs\n"
"             --desc               Read blobs in descending order\n"
"             --max-id N           Maximum blob key to use\n"
"             --random             Read blobs in a random order\n"
"             --start N            Start reading with this blob key\n"
;

/* Reference resources used */
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>

  char *zDb;                  /* Database or directory name */
  int i;                      /* Loop counter */
  int rc;                     /* Return code from SQLite calls */
  int nCount = 1000;          /* Number of blob fetch operations */
  int nExtra = 0;             /* Extra cycles */
  int iKey = 1;               /* Next blob key */
  int iMax = 1000;            /* Largest allowed key */
  int iPagesize = 0;          /* Database page size */
  int iCache = 1000;          /* Database cache size in kibibytes */
  int bBlobApi = 0;           /* Use the incremental blob I/O API */
  int eOrder = ORDER_ASC;     /* Access order */
  sqlite3 *db = 0;            /* Database connection */
  sqlite3_stmt *pStmt = 0;    /* Prepared statement for SQL access */
  sqlite3_blob *pBlob = 0;    /* Handle for incremental Blob I/O */
  sqlite3_int64 tmStart;      /* Start time */
  sqlite3_int64 tmElapsed;    /* Elapsed time */

      continue;
    }
    if( strcmp(z, "-start")==0 ){
      if( i==argc-1 ) fatalError("missing argument on \"%s\"", argv[i]);
      iKey = atoi(argv[++i]);
      if( iKey<1 ) fatalError("the --start must be positive");
      continue;
    }
    if( strcmp(z, "-cache-size")==0 ){
      if( i==argc-1 ) fatalError("missing argument on \"%s\"", argv[i]);
      iCache = atoi(argv[++i]);
      continue;
    }
    if( strcmp(z, "-random")==0 ){
      eOrder = ORDER_RANDOM;
      continue;
    }
    if( strcmp(z, "-asc")==0 ){
      eOrder = ORDER_ASC;

      bBlobApi = 1;
      continue;
    }
    fatalError("unknown option: \"%s\"", argv[i]);
  }
  tmStart = timeOfDay();
  if( eType==PATH_DB ){
    char *zSql;
    rc = sqlite3_open(zDb, &db);
    if( rc ){
      fatalError("cannot open database \"%s\": %s", zDb, sqlite3_errmsg(db));
    }
    zSql = sqlite3_mprintf("PRAGMA cache_size=%d", iCache);
    sqlite3_exec(db, zSql, 0, 0, 0);
    sqlite3_free(zSql);
    pStmt = 0;
    sqlite3_prepare_v2(db, "PRAGMA page_size", -1, &pStmt, 0);
    if( sqlite3_step(pStmt)==SQLITE_ROW ){
      iPagesize = sqlite3_column_int(pStmt, 0);
    }
    sqlite3_finalize(pStmt);
    sqlite3_prepare_v2(db, "PRAGMA cache_size", -1, &pStmt, 0);
    if( sqlite3_step(pStmt)==SQLITE_ROW ){
      iCache = sqlite3_column_int(pStmt, 0);
    }else{
      iCache = 0;
    }
    sqlite3_finalize(pStmt);
    pStmt = 0;
    sqlite3_exec(db, "BEGIN", 0, 0, 0);
  }
  for(i=0; i<nCount; i++){
    if( eType==PATH_DIR ){
      /* CASE 1: Reading blobs out of separate files */
      char *zKey;
      zKey = sqlite3_mprintf("%s/%06d", zDb, iKey);

  if( pStmt ) sqlite3_finalize(pStmt);
  if( pBlob ) sqlite3_blob_close(pBlob);
  if( db ) sqlite3_close(db);
  tmElapsed = timeOfDay() - tmStart;
  if( nExtra ){
    printf("%d cycles due to %d misses\n", nCount, nExtra);
  }
  if( eType==PATH_DB ){
    printf("SQLite version: %s\n", sqlite3_libversion());
  }
  printf("--count %d --max-id %d --cache-size %d", nCount-nExtra, iMax, iCache);
  switch( eOrder ){
    case ORDER_RANDOM:  printf(" --random\n");  break;
    case ORDER_DESC:    printf(" --desc\n");    break;
    default:            printf(" --asc\n");     break;
  }
  if( iPagesize ) printf("Database page size: %d\n", iPagesize);
  printf("Total elapsed time: %.3f\n", tmElapsed/1000.0);
  printf("Microseconds per BLOB read: %.3f\n", tmElapsed*1000.0/nCount);
  printf("Content read rate: %.1f MB/s\n", nTotal/(1000.0*tmElapsed));
  return 0;
}