src/StoreStats.h

   1 #ifndef SQUID_STORE_STATS_H
   2 #define SQUID_STORE_STATS_H
   3
   4 /// High-level store statistics used by mgr:info action. Used inside PODs!
   5 class StoreInfoStats {
   6 public:
   7     /// Info common to memory and disk parts of the storage. Used inside PODs!
   8     class Part {
   9     public:
  10         double size; ///< bytes currently in use
  11         double count; ///< number of cached objects
  12         double capacity; ///< the size limit
  13
  14         /// mean size of a cached object
  15         double meanObjectSize() const { return count > 0 ? size/count : 0.0; }
  16
  17         /// number of unused bytes
  18         double available() const { return capacity - size; }
  19     };
  20
  21     /// disk cache (all cache_dirs) storage stats
  22     class Swap: public Part {
  23     public:
  24         double open_disk_fd; ///< number of opened disk files
  25     };
  26
  27     /// memory cache (cache_mem) storage stats
  28     class Mem: public Part {
  29     public:
  30         bool shared; ///< whether memory cache is shared among workers
  31     };
  32
  33
  34     StoreInfoStats();
  35     StoreInfoStats &operator +=(const StoreInfoStats &stats);
  36
  37
  38     Swap swap; ///< cache_mem stats
  39     Mem mem; ///< all cache_dirs stats
  40
  41     /* stats that could be shared by memory and disk storage */
  42     double store_entry_count; ///< number of StoreEntry objects in existence
  43     double mem_object_count; ///< number of MemObject objects in existence
  44 };
  45
  46 // TODO: this should be adjusted for use in StoreIoActionData, DiskdActionData
  47 /// Store statistics related to low-level I/O.
  48 class StoreIoStats {
  49 public:
  50     StoreIoStats();
  51
  52     struct {
  53         int calls;
  54         int select_fail;
  55         int create_fail;
  56         int success;
  57     } create; ///< cache_dir selection and disk entry creation stats
  58 };
  59
  60 #endif /* SQUID_STORE_STATS_H */