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Add a project setting to enable stdout flushing in release builds #44393

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merged 1 commit into from
Dec 17, 2020
Merged

Add a project setting to enable stdout flushing in release builds #44393

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20 changes: 11 additions & 9 deletions core/io/logger.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -30,6 +30,7 @@

#include "logger.h"

#include "core/config/project_settings.h"
#include "core/os/dir_access.h"
#include "core/os/os.h"
#include "core/string/print_string.h"
Expand Down Expand Up @@ -201,15 +202,14 @@ void RotatedFileLogger::logv(const char *p_format, va_list p_list, bool p_err) {
}
va_end(list_copy);
file->store_buffer((uint8_t *)buf, len);

if (len >= static_buf_size) {
Memory::free_static(buf);
}
#ifdef DEBUG_ENABLED
const bool need_flush = true;
#else
bool need_flush = p_err;
#endif
if (need_flush) {

if (p_err || GLOBAL_GET("application/run/flush_stdout_on_print")) {
// Don't always flush when printing stdout to avoid performance
// issues when `print()` is spammed in release builds.
file->flush();
}
}
Expand All @@ -228,9 +228,11 @@ void StdLogger::logv(const char *p_format, va_list p_list, bool p_err) {
vfprintf(stderr, p_format, p_list);
} else {
vprintf(p_format, p_list);
#ifdef DEBUG_ENABLED
fflush(stdout);
#endif
if (GLOBAL_GET("application/run/flush_stdout_on_print")) {
// Don't always flush when printing stdout to avoid performance
// issues when `print()` is spammed in release builds.
fflush(stdout);
}
}
}

Expand Down
8 changes: 8 additions & 0 deletions doc/classes/ProjectSettings.xml
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Original file line number Diff line number Diff line change
Expand Up @@ -269,6 +269,14 @@
<member name="application/run/disable_stdout" type="bool" setter="" getter="" default="false">
If [code]true[/code], disables printing to standard output in an exported build.
</member>
<member name="application/run/flush_stdout_on_print" type="bool" setter="" getter="" default="false">
If [code]true[/code], flushes the standard output stream every time a line is printed. This affects both terminal logging and file logging.
When running a project, this setting must be enabled if you want logs to be collected by service managers such as systemd/journalctl. This setting is disabled by default on release builds, since flushing on every printed line will negatively affect performance if lots of lines are printed in a rapid succession. Also, if this setting is enabled, logged files will still be written successfully if the application crashes or is otherwise killed by the user (without being closed "normally").
[b]Note:[/b] Regardless of this setting, the standard error stream ([code]stderr[/code]) is always flushed when a line is printed to it.
</member>
<member name="application/run/flush_stdout_on_print.debug" type="bool" setter="" getter="" default="true">
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Debug build override for [member application/run/flush_stdout_on_print], as performance is less important during debugging.
</member>
<member name="application/run/frame_delay_msec" type="int" setter="" getter="" default="0">
Forces a delay between frames in the main loop (in milliseconds). This may be useful if you plan to disable vertical synchronization.
</member>
Expand Down
5 changes: 5 additions & 0 deletions main/main.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1121,6 +1121,11 @@ Error Main::setup(const char *execpath, int argc, char *argv[], bool p_second_ph
}
#endif

// Only flush stdout in debug builds by default, as spamming `print()` will
// decrease performance if this is enabled.
GLOBAL_DEF("application/run/flush_stdout_on_print", false);
GLOBAL_DEF("application/run/flush_stdout_on_print.debug", true);

GLOBAL_DEF("logging/file_logging/enable_file_logging", false);
// Only file logging by default on desktop platforms as logs can't be
// accessed easily on mobile/Web platforms (if at all).
Expand Down