rrdtool plugin: Call rand(3) less often.

[collectd.git] / src / rrdtool.c

diff --git a/src/rrdtool.c b/src/rrdtool.c
index 2787944..2bcfb6d 100644 (file)
--- a/src/rrdtool.c
+++ b/src/rrdtool.c
@@ -40,6 +40,7 @@ struct rrd_cache_s
        char **values;
        time_t first_value;
        time_t last_value;
+       int random_variation;
        enum
        {
                FLAG_NONE   = 0x00,
@@ -742,15 +743,14 @@ static int rrd_cache_insert (const char *filename,
                        filename, rc->values_num,
                        (unsigned long)(rc->last_value - rc->first_value));
 
-
-       if ((rc->last_value - rc->first_value) >= (cache_timeout + (random_timeout - (rand() % random_timeout_mod) ) ) )
+       if ((rc->last_value - rc->first_value + rc->random_variation) >= cache_timeout)
        {
                /* XXX: If you need to lock both, cache_lock and queue_lock, at
                 * the same time, ALWAYS lock `cache_lock' first! */
                if (rc->flags == FLAG_NONE)
                {
                        int status;
-
+                       rc->random_variation = (random_timeout - (rand() % random_timeout_mod));
                        status = rrd_queue_enqueue (filename, &queue_head, &queue_tail);
                        if (status == 0)
                                rc->flags = FLAG_QUEUED;