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u/metrics: Add option to fflush after writing each metrics record.

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This allows to use the metrics logging in "streaming mode" where
records are written out with low delay, e.g., into a Unix fifo
file / pipe for live consumption by some tracing or recording
application.

XRT_METRICS_EARLY_FLUSH=true enables this "streaming mode".

Signed-off-by: Mario Kleiner <mario.kleiner.de@gmail.com>
This commit is contained in:
Mario Kleiner 2023-04-14 21:24:42 +02:00 committed by Jakob Bornecrantz
parent d7f229959a
commit 1c96ee619d
1 changed files with 7 additions and 0 deletions
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7
src/xrt/auxiliary/util/u_metrics.c
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@ -23,8 +23,10 @@
static FILE *g_file = NULL; static FILE *g_file = NULL;
static struct os_mutex g_file_mutex; static struct os_mutex g_file_mutex;
static bool g_metrics_initialized = false; static bool g_metrics_initialized = false;
static bool g_metrics_early_flush = false;
DEBUG_GET_ONCE_OPTION(metrics_file, "XRT_METRICS_FILE", NULL) DEBUG_GET_ONCE_OPTION(metrics_file, "XRT_METRICS_FILE", NULL)
DEBUG_GET_ONCE_BOOL_OPTION(metrics_early_flush, "XRT_METRICS_EARLY_FLUSH", false)
@ -51,6 +53,10 @@ write_record(monado_metrics_Record *r)
fwrite(buffer, stream.bytes_written, 1, g_file); fwrite(buffer, stream.bytes_written, 1, g_file);
if (g_metrics_early_flush) {
fflush(g_file);
}
os_mutex_unlock(&g_file_mutex); os_mutex_unlock(&g_file_mutex);
} }
@ -96,6 +102,7 @@ u_metrics_init(void)
os_mutex_init(&g_file_mutex); os_mutex_init(&g_file_mutex);
g_metrics_initialized = true; g_metrics_initialized = true;
g_metrics_early_flush = debug_get_bool_option_metrics_early_flush();
write_version(VERSION_MAJOR, VERSION_MINOR); write_version(VERSION_MAJOR, VERSION_MINOR);