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Add a simple form of output rate limiting by counting the number of

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certain C0 sequences (linefeeds, backspaces, carriage returns) and if it
exceeds a threshold (current default 50/millisecond), start to redraw
the pane every 100 milliseconds instead of making each change as it
comes. Two configuration options - c0-change-trigger and
c0-change-interval.

This makes tmux much more responsive under very fast output (for example
yes(1) or accidentally cat'ing a large file) but may not be perfect on
all terminals and connections - feedback very welcome, particularly
where this change has a negative rather than positive effect (making it
off by default is a possibility).

After much experimentation based originally on a request Robin Lee
Powell (which ended with a completely different solution), this idea
from discussion with Ailin Nemui.
This commit is contained in:
Nicholas Marriott
2012-03-20 11:01:00 +00:00
parent bf9e7a1c68
commit f59971276a
6 changed files with 93 additions and 5 deletions
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16
input.c
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@@ -908,6 +908,7 @@ input_c0_dispatch(struct input_ctx *ictx)
struct screen_write_ctx *sctx = &ictx->ctx;
struct window_pane *wp = ictx->wp;
struct screen *s = sctx->s;
u_int trigger;
log_debug("%s: '%c", __func__, ictx->ch);
@@ -919,7 +920,7 @@ input_c0_dispatch(struct input_ctx *ictx)
break;
case '\010': /* BS */
screen_write_backspace(sctx);
break;
goto count_c0;
case '\011': /* HT */
/* Don't tab beyond the end of the line. */
if (s->cx >= screen_size_x(s) - 1)
@@ -936,10 +937,10 @@ input_c0_dispatch(struct input_ctx *ictx)
case '\013': /* VT */
case '\014': /* FF */
screen_write_linefeed(sctx, 0);
break;
goto count_c0;
case '\015': /* CR */
screen_write_carriagereturn(sctx);
break;
goto count_c0;
case '\016': /* SO */
ictx->cell.attr |= GRID_ATTR_CHARSET;
break;
@@ -951,6 +952,15 @@ input_c0_dispatch(struct input_ctx *ictx)
break;
}
return (0);
count_c0:
trigger = options_get_number(&wp->window->options, "c0-change-trigger");
if (++wp->changes == trigger) {
wp->flags |= PANE_DROP;
window_pane_timer_start(wp);
}
return (0);
}