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macOS: Fix rendering frames-per-second very low when processing large amounts of input in small chunks

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We do this by debouncing wakeup events sent to the main loop by the I/O
thread. Use in the input_delay time to debounce. Apparently processing
wakeup events is very expensive in Cocoa.

Fixes #1082
This commit is contained in:
Kovid Goyal 2018-10-23 10:27:56 +05:30
parent adf9c4fc5f
commit 40b355e593
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GPG Key ID: 06BC317B515ACE7C
2 changed files with 23 additions and 3 deletions
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3
docs/changelog.rst
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@ -29,6 +29,9 @@ Changelog
- macOS: Fix IME input for east asian languages (:iss:`910`)
- macOS: Fix rendering frames-per-second very low when processing
large amounts of input in small chunks (:pull:`1082`)
- Fix expansion of env vars not working in the :opt:`env` directive
(:iss:`1075`)

21
kitty/child-monitor.c
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@ -984,7 +984,8 @@ io_loop(void *data) {
// The I/O thread loop
size_t i;
int ret;
bool has_more, data_received;
bool has_more, data_received, has_pending_wakeups = false;
double last_main_loop_wakeup_at = -1, now = -1;
Screen *screen;
ChildMonitor *self = (ChildMonitor*)data;
set_thread_name("KittyChildMon");
@ -1003,7 +1004,14 @@ io_loop(void *data) {
fds[EXTRA_FDS + i].events = (screen->read_buf_sz < READ_BUF_SZ ? POLLIN : 0) | (screen->write_buf_used ? POLLOUT : 0);
screen_mutex(unlock, read); screen_mutex(unlock, write);
}
if (has_pending_wakeups) {
now = monotonic();
double time_delta = OPT(input_delay) - (now - last_main_loop_wakeup_at);
if (time_delta > 0) ret = poll(fds, self->count + EXTRA_FDS, -1);
else ret = 0;
} else {
ret = poll(fds, self->count + EXTRA_FDS, -1);
}
if (ret > 0) {
if (fds[0].revents && POLLIN) drain_fd(fds[0].fd); // wakeup
if (fds[1].revents && POLLIN) {
@ -1047,8 +1055,17 @@ io_loop(void *data) {
perror("Call to poll() failed");
}
}
if (data_received) wakeup_main_loop();
#define WAKEUP { wakeup_main_loop(); last_main_loop_wakeup_at = now; has_pending_wakeups = false; }
// we only wakeup the main loop after input_delay as wakeup is an expensive operation
// on some platforms, such as cocoa
if (data_received) {
if ((now = monotonic()) - last_main_loop_wakeup_at > OPT(input_delay)) WAKEUP
else has_pending_wakeups = true;
} else {
if (has_pending_wakeups && (now = monotonic()) - last_main_loop_wakeup_at > OPT(input_delay)) WAKEUP
}
}
#undef WAKEUP
children_mutex(lock);
for (i = 0; i < self->count; i++) children[i].needs_removal = true;
remove_children(self);