mirror of https://github.com/BOINC/boinc.git
132 lines
3.8 KiB
C
132 lines
3.8 KiB
C
// Berkeley Open Infrastructure for Network Computing
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// http://boinc.berkeley.edu
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// Copyright (C) 2005 University of California
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//
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// This is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation;
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// either version 2.1 of the License, or (at your option) any later version.
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//
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// This software is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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// See the GNU Lesser General Public License for more details.
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//
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// To view the GNU Lesser General Public License visit
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// http://www.gnu.org/copyleft/lesser.html
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// or write to the Free Software Foundation, Inc.,
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// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#ifdef _WIN32
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#include "boinc_win.h"
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#endif
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#ifndef _WIN32
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#include <cstdio>
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#include <ctime>
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#include <cmath>
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#endif
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#include "parse.h"
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#include "util.h"
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#include "error_numbers.h"
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#include "client_msgs.h"
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#include "time_stats.h"
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// exponential decay constant.
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// The last 30 days have a weight of 1/e;
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// everything before that has a weight of (1-1/e)
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const float ALPHA = (SECONDS_PER_DAY*30);
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TIME_STATS::TIME_STATS() {
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last_update = 0;
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first = true;
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on_frac = 1;
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connected_frac = 1;
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active_frac = 1;
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}
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// Update time statistics based on current activities
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//
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void TIME_STATS::update(bool is_connected, bool is_active) {
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int now = time(0), dt;
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double w1, w2;
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if (last_update == 0) {
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// this is the first time this client has executed.
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// Assume that its state has always been what it is now
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on_frac = 1;
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connected_frac = is_connected?1:0;
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active_frac = true;
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first = false;
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last_update = now;
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} else {
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dt = now - last_update;
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if (dt <= 0) return;
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w1 = 1 - exp(-dt/ALPHA);
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w2 = 1 - w1;
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if (first) {
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// the client has just started; this is the first call.
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// The client has been off (and disconnected and inactive)
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// since the last time it ran.
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on_frac *= w2;
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connected_frac *= w2;
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active_frac *= w2;
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first = false;
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} else {
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on_frac = w1 + w2*on_frac;
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connected_frac *= w2;
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if (is_connected) connected_frac += w1;
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active_frac *= w2;
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if (is_active) active_frac += w1;
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}
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last_update = now;
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}
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}
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// Write XML based time statistics
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//
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int TIME_STATS::write(MIOFILE& out, bool to_server) {
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out.printf(
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"<time_stats>\n"
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" <on_frac>%f</on_frac>\n"
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" <connected_frac>%f</connected_frac>\n"
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" <active_frac>%f</active_frac>\n",
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on_frac,
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connected_frac,
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active_frac
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);
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if (!to_server) {
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out.printf(
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" <last_update>%d</last_update>\n",
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last_update
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);
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}
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out.printf("</time_stats>\n");
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return 0;
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}
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// Parse XML based time statistics, usually from client_state.xml
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//
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int TIME_STATS::parse(MIOFILE& in) {
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char buf[256];
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SCOPE_MSG_LOG scope_messages(log_messages, CLIENT_MSG_LOG::DEBUG_STATE);
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while (in.fgets(buf, 256)) {
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if (match_tag(buf, "</time_stats>")) return 0;
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else if (parse_int(buf, "<last_update>", last_update)) continue;
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else if (parse_double(buf, "<on_frac>", on_frac)) continue;
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else if (parse_double(buf, "<connected_frac>", connected_frac)) continue;
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else if (parse_double(buf, "<active_frac>", active_frac)) continue;
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else scope_messages.printf("TIME_STATS::parse(): unrecognized: %s\n", buf);
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}
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return ERR_XML_PARSE;
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}
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const char *BOINC_RCSID_472504d8c2 = "$Id$";
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