squid---StatCounters.h

/* * AUTHOR: Francesco Chemolli (Harvest-derived) * * SQUID Web Proxy Cache          http://www.squid-cache.org/ * ---------------------------------------------------------- * *  Squid is the result of efforts by numerous individuals from *  the Internet community; see the CONTRIBUTORS file for full *  details.   Many organizations have provided support for Squid's *  development; see the SPONSORS file for full details.  Squid is *  Copyrighted (C) 2001 by the Regents of the University of *  California; see the COPYRIGHT file for full details.  Squid *  incorporates software developed and/or copyrighted by other *  sources; see the CREDITS file for full details. * *  This program is free software; you can redistribute it and/or modify *  it under the terms of the GNU General Public License as published by *  the Free Software Foundation; either version 2 of the License, or *  (at your option) any later version. * *  This program is distributed in the hope that it will be useful, *  but WITHOUT ANY WARRANTY; without even the implied warranty of *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the *  GNU General Public License for more details. * *  You should have received a copy of the GNU General Public License *  along with this program; if not, write to the Free Software *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA. * * */#ifndef STATCOUNTERS_H_#define STATCOUNTERS_H_#include "StatHist.h"#if USE_CACHE_DIGESTS/** statistics for cache digests and other hit "predictors" */class CacheDigestGuessStats{public:    int trueHits;    int falseHits;    int trueMisses;    int falseMisses;    int closeHits;     /// \todo: temporary remove it later};#endif/** General collection of process-wide statistics. * * \note if you add a field to StatCounters, * you MUST sync statCountersInitSpecial, statCountersClean, and statCountersCopy */class StatCounters{public:    struct {        int clients;        int requests;        int hits;        int mem_hits;        int disk_hits;        int errors;        kb_t kbytes_in;        kb_t kbytes_out;        kb_t hit_kbytes_out;        StatHist missSvcTime;        StatHist nearMissSvcTime;        StatHist nearHitSvcTime;        StatHist hitSvcTime;        StatHist allSvcTime;    } client_http;    struct {        struct {            int requests;            int errors;            kb_t kbytes_in;            kb_t kbytes_out;        } all , http, ftp, other;    } server;    struct {        int pkts_sent;        int queries_sent;        int replies_sent;        int pkts_recv;        int queries_recv;        int replies_recv;        int hits_sent;        int hits_recv;        int replies_queued;        int replies_dropped;        kb_t kbytes_sent;        kb_t q_kbytes_sent;        kb_t r_kbytes_sent;        kb_t kbytes_recv;        kb_t q_kbytes_recv;        kb_t r_kbytes_recv;        StatHist querySvcTime;        StatHist replySvcTime;        int query_timeouts;        int times_used;    } icp;    struct {        int pkts_sent;        int pkts_recv;    } htcp;    struct {        int requests;    } unlink;    struct {        StatHist svcTime;    } dns;    struct {        int times_used;        kb_t kbytes_sent;        kb_t kbytes_recv;        kb_t memory;        int msgs_sent;        int msgs_recv;#if USE_CACHE_DIGESTS        CacheDigestGuessStats guess;#endif        StatHist on_xition_count;    } cd;    struct {        int times_used;    } netdb;    int page_faults;    unsigned long int select_loops;    int select_fds;    double select_time;    double cputime;    struct timeval timestamp;    StatHist comm_udp_incoming;    StatHist comm_dns_incoming;    StatHist comm_tcp_incoming;    StatHist select_fds_hist;    struct {        struct {            int opens;            int closes;            int reads;            int writes;            int seeks;            int unlinks;        } disk;        struct {            int accepts;            int sockets;            int connects;            int binds;            int closes;            int reads;            int writes;            int recvfroms;            int sendtos;        } sock;        int selects;    } syscalls;    int aborted_requests;    struct {        int files_cleaned;        int outs;        int ins;    } swap;private:};extern StatCounters statCounter;#endif /* STATCOUNTERS_H_ */

这个文件将系统运行时的统计信息进行收集，例如在新建client时，会更新statCounter.client_http.clients。StatCounters类是一个全局的类。