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0fae1e072a
The values in struct throughput are only updated every 0.5 seconds. If we're all done before that time span then the final update will show a rate of 0 bytes/s, which is misleading if some bytes had been handled. Remember the start time and show the total throughput instead. And avoid division by zero by enforcing a minimum time span value of 1 (unit: 1/1024th of a second). That makes the resulting rate an underestimation, but it's closer to the actual value than the currently shown 0 bytes/s. Reported-by: 積丹尼 Dan Jacobson <jidanni@jidanni.org> Signed-off-by: Rene Scharfe <l.s.r@web.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
269 lines
6.3 KiB
C
269 lines
6.3 KiB
C
/*
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* Simple text-based progress display module for GIT
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*
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* Copyright (c) 2007 by Nicolas Pitre <nico@fluxnic.net>
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*
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* This code is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include "git-compat-util.h"
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#include "gettext.h"
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#include "progress.h"
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#include "strbuf.h"
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#include "trace.h"
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#define TP_IDX_MAX 8
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struct throughput {
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off_t curr_total;
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off_t prev_total;
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uint64_t prev_ns;
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unsigned int avg_bytes;
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unsigned int avg_misecs;
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unsigned int last_bytes[TP_IDX_MAX];
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unsigned int last_misecs[TP_IDX_MAX];
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unsigned int idx;
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struct strbuf display;
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};
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struct progress {
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const char *title;
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int last_value;
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unsigned total;
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unsigned last_percent;
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unsigned delay;
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unsigned delayed_percent_treshold;
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struct throughput *throughput;
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uint64_t start_ns;
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};
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static volatile sig_atomic_t progress_update;
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static void progress_interval(int signum)
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{
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progress_update = 1;
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}
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static void set_progress_signal(void)
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{
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struct sigaction sa;
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struct itimerval v;
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progress_update = 0;
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memset(&sa, 0, sizeof(sa));
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sa.sa_handler = progress_interval;
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sigemptyset(&sa.sa_mask);
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sa.sa_flags = SA_RESTART;
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sigaction(SIGALRM, &sa, NULL);
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v.it_interval.tv_sec = 1;
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v.it_interval.tv_usec = 0;
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v.it_value = v.it_interval;
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setitimer(ITIMER_REAL, &v, NULL);
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}
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static void clear_progress_signal(void)
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{
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struct itimerval v = {{0,},};
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setitimer(ITIMER_REAL, &v, NULL);
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signal(SIGALRM, SIG_IGN);
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progress_update = 0;
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}
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static int is_foreground_fd(int fd)
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{
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int tpgrp = tcgetpgrp(fd);
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return tpgrp < 0 || tpgrp == getpgid(0);
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}
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static int display(struct progress *progress, unsigned n, const char *done)
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{
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const char *eol, *tp;
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if (progress->delay) {
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if (!progress_update || --progress->delay)
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return 0;
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if (progress->total) {
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unsigned percent = n * 100 / progress->total;
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if (percent > progress->delayed_percent_treshold) {
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/* inhibit this progress report entirely */
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clear_progress_signal();
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progress->delay = -1;
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progress->total = 0;
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return 0;
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}
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}
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}
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progress->last_value = n;
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tp = (progress->throughput) ? progress->throughput->display.buf : "";
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eol = done ? done : " \r";
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if (progress->total) {
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unsigned percent = n * 100 / progress->total;
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if (percent != progress->last_percent || progress_update) {
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progress->last_percent = percent;
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if (is_foreground_fd(fileno(stderr)) || done) {
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fprintf(stderr, "%s: %3u%% (%u/%u)%s%s",
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progress->title, percent, n,
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progress->total, tp, eol);
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fflush(stderr);
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}
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progress_update = 0;
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return 1;
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}
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} else if (progress_update) {
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if (is_foreground_fd(fileno(stderr)) || done) {
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fprintf(stderr, "%s: %u%s%s",
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progress->title, n, tp, eol);
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fflush(stderr);
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}
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progress_update = 0;
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return 1;
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}
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return 0;
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}
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static void throughput_string(struct strbuf *buf, off_t total,
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unsigned int rate)
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{
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strbuf_reset(buf);
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strbuf_addstr(buf, ", ");
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strbuf_humanise_bytes(buf, total);
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strbuf_addstr(buf, " | ");
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strbuf_humanise_bytes(buf, rate * 1024);
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strbuf_addstr(buf, "/s");
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}
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void display_throughput(struct progress *progress, off_t total)
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{
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struct throughput *tp;
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uint64_t now_ns;
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unsigned int misecs, count, rate;
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if (!progress)
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return;
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tp = progress->throughput;
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now_ns = getnanotime();
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if (!tp) {
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progress->throughput = tp = calloc(1, sizeof(*tp));
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if (tp) {
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tp->prev_total = tp->curr_total = total;
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tp->prev_ns = now_ns;
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strbuf_init(&tp->display, 0);
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}
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return;
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}
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tp->curr_total = total;
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/* only update throughput every 0.5 s */
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if (now_ns - tp->prev_ns <= 500000000)
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return;
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/*
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* We have x = bytes and y = nanosecs. We want z = KiB/s:
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*
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* z = (x / 1024) / (y / 1000000000)
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* z = x / y * 1000000000 / 1024
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* z = x / (y * 1024 / 1000000000)
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* z = x / y'
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*
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* To simplify things we'll keep track of misecs, or 1024th of a sec
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* obtained with:
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*
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* y' = y * 1024 / 1000000000
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* y' = y * (2^10 / 2^42) * (2^42 / 1000000000)
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* y' = y / 2^32 * 4398
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* y' = (y * 4398) >> 32
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*/
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misecs = ((now_ns - tp->prev_ns) * 4398) >> 32;
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count = total - tp->prev_total;
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tp->prev_total = total;
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tp->prev_ns = now_ns;
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tp->avg_bytes += count;
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tp->avg_misecs += misecs;
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rate = tp->avg_bytes / tp->avg_misecs;
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tp->avg_bytes -= tp->last_bytes[tp->idx];
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tp->avg_misecs -= tp->last_misecs[tp->idx];
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tp->last_bytes[tp->idx] = count;
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tp->last_misecs[tp->idx] = misecs;
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tp->idx = (tp->idx + 1) % TP_IDX_MAX;
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throughput_string(&tp->display, total, rate);
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if (progress->last_value != -1 && progress_update)
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display(progress, progress->last_value, NULL);
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}
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int display_progress(struct progress *progress, unsigned n)
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{
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return progress ? display(progress, n, NULL) : 0;
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}
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struct progress *start_progress_delay(const char *title, unsigned total,
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unsigned percent_treshold, unsigned delay)
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{
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struct progress *progress = malloc(sizeof(*progress));
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if (!progress) {
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/* unlikely, but here's a good fallback */
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fprintf(stderr, "%s...\n", title);
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fflush(stderr);
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return NULL;
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}
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progress->title = title;
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progress->total = total;
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progress->last_value = -1;
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progress->last_percent = -1;
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progress->delayed_percent_treshold = percent_treshold;
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progress->delay = delay;
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progress->throughput = NULL;
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progress->start_ns = getnanotime();
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set_progress_signal();
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return progress;
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}
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struct progress *start_progress(const char *title, unsigned total)
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{
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return start_progress_delay(title, total, 0, 0);
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}
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void stop_progress(struct progress **p_progress)
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{
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stop_progress_msg(p_progress, _("done"));
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}
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void stop_progress_msg(struct progress **p_progress, const char *msg)
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{
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struct progress *progress = *p_progress;
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if (!progress)
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return;
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*p_progress = NULL;
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if (progress->last_value != -1) {
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/* Force the last update */
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char *buf;
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struct throughput *tp = progress->throughput;
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if (tp) {
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uint64_t now_ns = getnanotime();
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unsigned int misecs, rate;
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misecs = ((now_ns - progress->start_ns) * 4398) >> 32;
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rate = tp->curr_total / (misecs ? misecs : 1);
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throughput_string(&tp->display, tp->curr_total, rate);
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}
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progress_update = 1;
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buf = xstrfmt(", %s.\n", msg);
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display(progress, progress->last_value, buf);
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free(buf);
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}
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clear_progress_signal();
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if (progress->throughput)
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strbuf_release(&progress->throughput->display);
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free(progress->throughput);
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free(progress);
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}
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