mirror of https://github.com/BOINC/boinc.git
120 lines
3.5 KiB
C
120 lines
3.5 KiB
C
// The contents of this file are subject to the Mozilla Public License
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// Version 1.0 (the "License"); you may not use this file except in
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// compliance with the License. You may obtain a copy of the License at
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// http://www.mozilla.org/MPL/
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//
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// Software distributed under the License is distributed on an "AS IS"
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// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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// License for the specific language governing rights and limitations
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// under the License.
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//
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// The Original Code is the Berkeley Open Infrastructure for Network Computing.
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//
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// The Initial Developer of the Original Code is the SETI@home project.
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// Portions created by the SETI@home project are Copyright (C) 2002
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// University of California at Berkeley. All Rights Reserved.
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//
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// Contributor(s):
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//
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#include <stdio.h>
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#include <time.h>
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#include <math.h>
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#include "parse.h"
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#include "error_numbers.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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#define ALPHA (3600.*24*7*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 = is_active?1:0;
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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(FILE* out, bool to_server) {
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fprintf(out,
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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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fprintf(out,
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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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fprintf(out, "</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(FILE* in) {
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char buf[256];
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while (fgets(buf, 256, in)) {
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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 fprintf(stderr, "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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