forked from 0ad/0ad
362 lines
8.8 KiB
C++
362 lines
8.8 KiB
C++
/**
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* =========================================================================
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* File : file_stats.cpp
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* Project : 0 A.D.
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* Description : gathers statistics from all file modules.
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*
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* @author Jan.Wassenberg@stud.uni-karlsruhe.de
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* =========================================================================
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*/
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/*
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* Copyright (c) 2005-2006 Jan Wassenberg
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*
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* Redistribution and/or modification are also permitted under the
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* terms of the GNU General Public License as published by the
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* Free Software Foundation (version 2 or later, at your option).
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#include "precompiled.h"
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#include "file_stats.h"
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#include <set>
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#include "lib/timer.h"
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#include "file_internal.h"
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typedef std::set<const char*> AtomFnSet;
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typedef std::pair<AtomFnSet::iterator, bool> PairIB;
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// vfs
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static uint vfs_files;
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static size_t vfs_size_total;
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static double vfs_init_elapsed_time;
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// file
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static uint unique_names;
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static size_t unique_name_len_total;
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static uint open_files_cur, open_files_max; // total = opened_files.size()
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static double opened_file_size_total;
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static AtomFnSet opened_files;
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// file_buf
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static uint extant_bufs_cur, extant_bufs_max, extant_bufs_total;
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static double buf_user_size_total, buf_padded_size_total;
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// file_io
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static uint user_ios;
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static double user_io_size_total;
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static double io_actual_size_total[FI_MAX_IDX][2];
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static double io_elapsed_time[FI_MAX_IDX][2];
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static double io_process_time_total;
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static uint io_seeks;
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// file_cache
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static uint cache_count[2];
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static double cache_size_total[2];
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static AtomFnSet ever_cached_files;
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static uint conflict_misses;
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static double conflict_miss_size_total;
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static uint block_cache_count[2];
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// archive builder
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static uint ab_connection_attempts; // total number of trace entries
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static uint ab_repeated_connections; // how many of these were not unique
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// convenience functions for measuring elapsed time in an interval.
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// by exposing start/finish calls, we avoid callers from querying
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// timestamps when stats are disabled.
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static double start_time;
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static void timer_start(double* start_time_storage = &start_time)
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{
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// make sure no measurement is currently active
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// (since start_time is shared static storage)
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debug_assert(*start_time_storage == 0.0);
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*start_time_storage = get_time();
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}
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static double timer_reset(double* start_time_storage = &start_time)
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{
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double elapsed = get_time() - *start_time_storage;
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*start_time_storage = 0.0;
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return elapsed;
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}
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//-----------------------------------------------------------------------------
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//
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// vfs
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//
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void stats_vfs_file_add(size_t file_size)
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{
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vfs_files++;
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vfs_size_total += file_size;
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}
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void stats_vfs_file_remove(size_t file_size)
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{
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vfs_files--;
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vfs_size_total -= file_size;
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}
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void stats_vfs_init_start()
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{
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timer_start();
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}
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void stats_vfs_init_finish()
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{
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vfs_init_elapsed_time += timer_reset();
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}
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//
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// file
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//
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void stats_unique_name(size_t name_len)
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{
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unique_names++;
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unique_name_len_total += name_len;
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}
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void stats_open(const char* atom_fn, size_t file_size)
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{
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open_files_cur++;
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open_files_max = MAX(open_files_max, open_files_cur);
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PairIB ret = opened_files.insert(atom_fn);
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// hadn't been opened yet
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if(ret.second)
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opened_file_size_total += file_size;
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}
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void stats_close()
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{
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debug_assert(open_files_cur > 0);
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open_files_cur--;
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}
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//
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// file_buf
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//
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void stats_buf_alloc(size_t user_size, size_t padded_size)
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{
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extant_bufs_cur++;
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extant_bufs_max = MAX(extant_bufs_max, extant_bufs_cur);
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extant_bufs_total++;
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buf_user_size_total += user_size;
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buf_padded_size_total += padded_size;
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}
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void stats_buf_free()
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{
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debug_assert(extant_bufs_cur > 0);
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extant_bufs_cur--;
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}
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void stats_buf_ref()
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{
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extant_bufs_cur++;
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}
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//
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// file_io
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//
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void stats_io_user_request(size_t user_size)
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{
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user_ios++;
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user_io_size_total += user_size;
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}
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// these bracket file_io's IOManager::run and measure effective throughput.
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// note: cannot be called from aio issue/finish because IOManager's
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// decompression may cause us to miss the exact end of IO, thus throwing off
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// throughput measurements.
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void stats_io_sync_start(double* start_time_storage)
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{
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timer_start(start_time_storage);
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}
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void stats_io_sync_finish(FileIOImplentation fi, FileOp fo, ssize_t user_size, double* start_time_storage)
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{
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debug_assert(fi < FI_MAX_IDX);
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debug_assert(fo == FO_READ || FO_WRITE);
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// ignore IOs that failed (nothing we can do)
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if(user_size > 0)
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{
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io_actual_size_total[fi][fo] += user_size;
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io_elapsed_time[fi][fo] += timer_reset(start_time_storage);
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}
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}
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void stats_io_check_seek(const char* atom_fn, u32 block_num)
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{
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static const char* last_atom_fn;
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static u32 last_block_num;
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// makes debugging ("why are there seeks") a bit nicer by suppressing
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// the first (bogus) seek.
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if(!last_atom_fn)
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goto dont_count_first_seek;
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if(atom_fn != last_atom_fn || // different file OR
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block_num != last_block_num+1) // nonsequential
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io_seeks++;
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dont_count_first_seek:
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last_atom_fn = atom_fn;
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last_block_num = block_num;
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}
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void stats_cb_start()
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{
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timer_start();
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}
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void stats_cb_finish()
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{
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io_process_time_total += timer_reset();
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}
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//
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// file_cache
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//
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void stats_cache(CacheRet cr, size_t size, const char* atom_fn)
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{
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debug_assert(cr == CR_HIT || cr == CR_MISS);
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if(cr == CR_MISS)
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{
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PairIB ret = ever_cached_files.insert(atom_fn);
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if(!ret.second) // was already cached once
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{
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conflict_miss_size_total += size;
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conflict_misses++;
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}
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}
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cache_count[cr]++;
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cache_size_total[cr] += size;
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}
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void stats_block_cache(CacheRet cr)
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{
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debug_assert(cr == CR_HIT || cr == CR_MISS);
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block_cache_count[cr]++;
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}
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//
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// archive builder
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//
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void stats_ab_connection(bool already_exists)
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{
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ab_connection_attempts++;
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if(already_exists)
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ab_repeated_connections++;
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}
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//-----------------------------------------------------------------------------
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template<typename T> int percent(T num, T divisor)
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{
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if(!divisor)
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return 0;
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return (int)(100*num / divisor);
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}
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void file_stats_dump()
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{
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if(!debug_filter_allows("FILE_STATS|"))
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return;
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const double KB = 1e3; const double MB = 1e6; const double ms = 1e-3;
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debug_printf("--------------------------------------------------------------------------------\n");
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debug_printf("File statistics:\n");
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// note: we split the reports into several debug_printfs for clarity;
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// this is necessary anyway due to fixed-size buffer.
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debug_printf(
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"\nvfs:\n"
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"Total files: %u (%g MB)\n"
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"Init/mount time: %g ms\n",
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vfs_files, vfs_size_total/MB,
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vfs_init_elapsed_time/ms
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);
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debug_printf(
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"\nfile:\n"
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"Total names: %u (%u KB)\n"
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"Accessed files: %u (%g MB) -- %u%% of data set\n"
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"Max. concurrent: %u; leaked: %u.\n",
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unique_names, unique_name_len_total/1000,
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opened_files.size(), opened_file_size_total/MB, percent(opened_files.size(), (size_t)vfs_files),
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open_files_max, open_files_cur
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);
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debug_printf(
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"\nfile_buf:\n"
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"Total buffers used: %u (%g MB)\n"
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"Max concurrent: %u; leaked: %u\n"
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"Internal fragmentation: %d%%\n",
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extant_bufs_total, buf_user_size_total/MB,
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extant_bufs_max, extant_bufs_cur,
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percent(buf_padded_size_total-buf_user_size_total, buf_user_size_total)
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);
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debug_printf(
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"\nfile_io:\n"
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"Total user load requests: %u (%g MB)\n"
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"IO thoughput [MB/s; 0=never happened]:\n"
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" lowio: R=%.3g, W=%.3g\n"
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" aio: R=%.3g, W=%.3g\n"
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"Average size = %g KB; seeks: %u; total callback time: %g ms\n"
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"Total data actually read from disk = %g MB\n",
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user_ios, user_io_size_total/MB,
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#define THROUGHPUT(impl, op) (io_elapsed_time[impl][op] == 0.0)? 0.0 : (io_actual_size_total[impl][op] / io_elapsed_time[impl][op] / MB)
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THROUGHPUT(FI_LOWIO, FO_READ), THROUGHPUT(FI_LOWIO, FO_WRITE),
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THROUGHPUT(FI_AIO , FO_READ), THROUGHPUT(FI_AIO , FO_WRITE),
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user_io_size_total/user_ios/KB, io_seeks, io_process_time_total/ms,
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(io_actual_size_total[FI_LOWIO][FO_READ]+io_actual_size_total[FI_AIO][FO_READ])/MB
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);
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debug_printf(
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"\nfile_cache:\n"
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"Hits: %u (%g MB); misses %u (%g MB); ratio: %u%%\n"
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"Percent of requested bytes satisfied by cache: %u%%; non-compulsory misses: %u (%u%% of misses)\n"
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"Block hits: %u; misses: %u; ratio: %u%%\n",
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cache_count[CR_HIT], cache_size_total[CR_HIT]/MB, cache_count[CR_MISS], cache_size_total[CR_MISS]/MB, percent(cache_count[CR_HIT], cache_count[CR_HIT]+cache_count[CR_MISS]),
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percent(cache_size_total[CR_HIT], cache_size_total[CR_HIT]+cache_size_total[CR_MISS]), conflict_misses, percent(conflict_misses, cache_count[CR_MISS]),
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block_cache_count[CR_HIT], block_cache_count[CR_MISS], percent(block_cache_count[CR_HIT], block_cache_count[CR_HIT]+block_cache_count[CR_MISS])
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);
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debug_printf(
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"\nvfs_optimizer:\n"
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"Total trace entries: %u; repeated connections: %u; unique files: %u\n",
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ab_connection_attempts, ab_repeated_connections, ab_connection_attempts-ab_repeated_connections
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);
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}
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