static int screen_width = DEFAULT_SCREEN_WIDTH;
+/* Size of the history table for download speeds. */
+#define DLSPEED_HISTORY_SIZE 30
+
+/* The time interval in milliseconds below which we increase old
+ history entries rather than overwriting them. That interval
+ represents the scope of the download speed history. */
+#define DLSPEED_HISTORY_MAX_INTERVAL 3000
+
struct bar_progress {
long initial_length; /* how many bytes have been downloaded
previously. */
download finishes */
long count; /* bytes downloaded so far */
- long last_update; /* time of the last screen update. */
+ long last_screen_update; /* time of the last screen update. */
int width; /* screen width we're using at the
time the progress gauge was
signal. */
char *buffer; /* buffer where the bar "image" is
stored. */
- int tick;
+ int tick; /* counter used for drawing the
+ progress bar where the total size
+ is not known. */
+
+ /* The following variables (kept in a struct for namespace reasons)
+ keep track of recent download speeds. See bar_update() for
+ details. */
+ struct bar_progress_hist {
+ int pos;
+ long times[DLSPEED_HISTORY_SIZE];
+ long bytes[DLSPEED_HISTORY_SIZE];
+ long summed_times;
+ long summed_bytes;
+ long previous_time;
+ } hist;
+
+ /* create_image() uses these to make sure that ETA information
+ doesn't flash. */
+ long last_eta_time; /* time of the last update to download
+ speed and ETA. */
+ long last_eta_value;
};
static void create_image PARAMS ((struct bar_progress *, long));
bar_update (void *progress, long howmuch, long dltime)
{
struct bar_progress *bp = progress;
- int force_update = 0;
+ struct bar_progress_hist *hist = &bp->hist;
+ int force_screen_update = 0;
+ long delta_time = dltime - hist->previous_time;
bp->count += howmuch;
if (bp->total_length > 0
equal to the expected size doesn't abort. */
bp->total_length = bp->count + bp->initial_length;
+ /* This code attempts to determine the current download speed. We
+ measure the speed over the interval of approximately three
+ seconds, in subintervals no smaller than 0.1s. In other words,
+ we maintain and use the history of 30 most recent reads, where a
+ "read" consists of one or more network reads, up until the point
+ where a subinterval is filled. */
+
+ if (hist->times[hist->pos]
+ >= DLSPEED_HISTORY_MAX_INTERVAL / DLSPEED_HISTORY_SIZE)
+ {
+ /* The subinterval at POS has been used up. Move on to the next
+ position. */
+ if (++hist->pos == DLSPEED_HISTORY_SIZE)
+ hist->pos = 0;
+
+ /* Invalidate old data (from the previous cycle) at this
+ position. */
+ hist->summed_times -= hist->times[hist->pos];
+ hist->summed_bytes -= hist->bytes[hist->pos];
+ hist->times[hist->pos] = delta_time;
+ hist->bytes[hist->pos] = howmuch;
+ }
+ else
+ {
+ /* Increment the data at POS. */
+ hist->times[hist->pos] += delta_time;
+ hist->bytes[hist->pos] += howmuch;
+ }
+
+ hist->summed_times += delta_time;
+ hist->summed_bytes += howmuch;
+ hist->previous_time = dltime;
+
+#if 0
+ /* Sledgehammer check that summed_times and summed_bytes are
+ accurate. */
+ {
+ int i;
+ long sumt = 0, sumb = 0;
+ for (i = 0; i < DLSPEED_HISTORY_SIZE; i++)
+ {
+ sumt += hist->times[i];
+ sumb += hist->bytes[i];
+ }
+ assert (sumt == hist->summed_times);
+ assert (sumb == hist->summed_bytes);
+ }
+#endif
+
if (screen_width - 1 != bp->width)
{
bp->width = screen_width - 1;
bp->buffer = xrealloc (bp->buffer, bp->width + 1);
- force_update = 1;
+ force_screen_update = 1;
}
- if (dltime - bp->last_update < 200 && !force_update)
+ if (dltime - bp->last_screen_update < 200 && !force_screen_update)
/* Don't update more often than five times per second. */
return;
- bp->last_update = dltime;
-
create_image (bp, dltime);
display_image (bp->buffer);
+ bp->last_screen_update = dltime;
}
static void
{
struct bar_progress *bp = progress;
+ /* If the download was faster than the granularity of the timer,
+ fake some output so that we don't get the ugly "----.--" rate at
+ the download finish. */
+ if (bp->hist.summed_times == 0)
+ bp->hist.summed_times = 1;
if (dltime == 0)
- /* If the download was faster than the granularity of the timer,
- fake some output so that we don't get the ugly "----.--" rate
- at the download finish. */
dltime = 1;
create_image (bp, dltime);
#endif
static void
-create_image (struct bar_progress *bp, long dltime)
+create_image (struct bar_progress *bp, long dl_total_time)
{
char *p = bp->buffer;
long size = bp->initial_length + bp->count;
char *size_legible = legible (size);
int size_legible_len = strlen (size_legible);
+ long recent_time = bp->hist.summed_times;
+ long recent_bytes = bp->hist.summed_bytes;
+
/* The progress bar should look like this:
xx% [=======> ] nn,nnn 12.34K/s ETA 00:00
p += strlen (p);
/* " 1012.45K/s" */
- if (dltime && bp->count)
+ if (recent_time && recent_bytes)
{
static char *short_units[] = { "B/s", "K/s", "M/s", "G/s" };
int units = 0;
- double dlrate = calc_rate (bp->count, dltime, &units);
+ double dlrate = calc_rate (recent_bytes, recent_time, &units);
sprintf (p, " %7.2f%s", dlrate, short_units[units]);
p += strlen (p);
}
APPEND_LITERAL (" --.--K/s");
/* " ETA xx:xx:xx" */
- if (bp->total_length > 0 && bp->count > 0)
+ if (bp->total_length > 0 && recent_bytes > 0)
{
- int eta, eta_hrs, eta_min, eta_sec;
- double tm_sofar = (double)dltime / 1000;
- long bytes_remaining = bp->total_length - size;
-
- eta = (int) (tm_sofar * bytes_remaining / bp->count);
+ long eta;
+ int eta_hrs, eta_min, eta_sec;
+
+ /* Don't change the value of ETA more than approximately once
+ per second; doing so would cause flashing without providing
+ any value to the user. */
+ if (dl_total_time - bp->last_eta_time < 900
+ && bp->last_eta_value != 0)
+ eta = bp->last_eta_value;
+ else
+ {
+ double tm_sofar = (double)recent_time / 1000;
+ long bytes_remaining = bp->total_length - size;
+ eta = (long) (tm_sofar * bytes_remaining / recent_bytes);
+ bp->last_eta_value = eta;
+ bp->last_eta_time = dl_total_time;
+ }
eta_hrs = eta / 3600, eta %= 3600;
eta_min = eta / 60, eta %= 60;
/* Hours not printed: pad with three spaces (two digits and
colon). */
APPEND_LITERAL (" ");
- else if (eta_hrs >= 10)
+ else if (eta_hrs < 10)
/* Hours printed with one digit: pad with one space. */
*p++ = ' ';
else
static void
display_image (char *buf)
{
+ int old = log_set_save_context (0);
logputs (LOG_VERBOSE, "\r");
logputs (LOG_VERBOSE, buf);
+ log_set_save_context (old);
}
static void
projects / wget / blobdiff