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Add last_fork_start_time to INFO STATS #978

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Add last_fork_start_time to INFO STATS #978

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de56240
Add latest_fork_time to INFO STATS
enjoy-binbin Sep 2, 2024
89cf46e
Merge remote-tracking branch 'upstream/unstable' into last_fork_time
enjoy-binbin Oct 30, 2024
119e351
Rename to last_fork_start_time
enjoy-binbin Oct 30, 2024
d914f67
remove tmp files
enjoy-binbin Oct 31, 2024
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3 changes: 3 additions & 0 deletions src/server.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2609,6 +2609,7 @@ void resetServerStats(void) {
server.stat_fork_time = 0;
server.stat_fork_rate = 0;
server.stat_total_forks = 0;
server.stat_last_fork_start_time = 0;
server.stat_rejected_conn = 0;
server.stat_sync_full = 0;
server.stat_sync_partial_ok = 0;
Expand Down Expand Up @@ -5843,6 +5844,7 @@ sds genValkeyInfoString(dict *section_dict, int all_sections, int everything) {
"pubsubshard_channels:%llu\r\n", kvstoreSize(server.pubsubshard_channels),
"latest_fork_usec:%lld\r\n", server.stat_fork_time,
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@madolson madolson Feb 3, 2025 •
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Not specifically related to this PR, but this info field is confusing. We thought it was how long the fork latest, but apparently it just covers the system call time. This made the info name you proposed a bit odd since it also used fork.

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yes, it is indeed confusing at the first time. A field show how long the fork latest also will be helpful.

"total_forks:%lld\r\n", server.stat_total_forks,
"last_fork_start_time:%lld\r\n", server.stat_last_fork_start_time,
"migrate_cached_sockets:%ld\r\n", dictSize(server.migrate_cached_sockets),
"slave_expires_tracked_keys:%zu\r\n", getReplicaKeyWithExpireCount(),
"active_defrag_hits:%lld\r\n", server.stat_active_defrag_hits,
Expand Down Expand Up @@ -6435,6 +6437,7 @@ int serverFork(int purpose) {
server.stat_fork_time = ustime() - start;
server.stat_fork_rate =
(double)zmalloc_used_memory() * 1000000 / server.stat_fork_time / (1024 * 1024 * 1024); /* GB per second. */
server.stat_last_fork_start_time = start;
latencyAddSampleIfNeeded("fork", server.stat_fork_time / 1000);

/* The child_pid and child_type are only for mutually exclusive children.
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1 change: 1 addition & 0 deletions src/server.h
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Expand Up @@ -1808,6 +1808,7 @@ struct valkeyServer {
long long stat_fork_time; /* Time needed to perform latest fork() */
double stat_fork_rate; /* Fork rate in GB/sec. */
long long stat_total_forks; /* Total count of fork. */
long long stat_last_fork_start_time; /* Last us time to start a successful fork(). */
long long stat_rejected_conn; /* Clients rejected because of maxclients */
long long stat_sync_full; /* Number of full resyncs with replicas. */
long long stat_sync_partial_ok; /* Number of accepted PSYNC requests. */
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