Dear apache users,
I'm looking for help with MPM events settings and scoreboard full error.
I read many suggestions but not really a guide to understand what happened.
I have a webserver that mainly is used for php pages with fpm and as
websocket proxy.
These are some details or Apache installation:
Ubuntu 20.04.6 LTS - 8GB RAM 2 cpu
Server Version: Apache/2.4.41 (Ubuntu) mod_fcgid/2.3.9 OpenSSL/1.1.1f
Server MPM: event
Server Built: 2024-07-17T18:58:09
Yesterday I started to get this error:
[Wed Mar 12 21:48:26.198131 2025] [mpm_event:error] [pid 3510776:tid
139759223077952] AH03490: scoreboard is full, not at
MaxRequestWorkers.Increase ServerLimit.
At midnight after logrotation restart, the webserver became completely
not reachable and it made just the same "scoreboard is full" log every
second.
I manually restarted apache service this morning and then everything
came back to normal. During shutdown there were some logs like this "
AH00046: child process 178881 still did not exit, sending a SIGKILL".
Fortunately I had a cron to save apache status, so this is the status
at midnight after apache was completely unreachable (and it stopped
event to reply to status request). And this is the output:
Apache Server Status for localhost (via 127.0.0.1)
Server Version: Apache/2.4.41 (Ubuntu) mod_fcgid/2.3.9 OpenSSL/1.1.1f
Server MPM: event
Server Built: 2024-07-17T18:58:09
-------------------------------------------------------------------------------
Current Time: Thursday, 13-Mar-2025 00:00:01 CET
Restart Time: Thursday, 06-Mar-2025 11:27:01 CET
Parent Server Config. Generation: 8
Parent Server MPM Generation: 7
Server uptime: 6 days 12 hours 32 minutes 59 seconds
Server load: 0.09 0.11 0.09
Total accesses: 597286 - Total Traffic: 10.1 GB - Total Duration: 26001983413
CPU Usage: u817.39 s221.47 cu948.69 cs297.75 - .405% CPU load
1.06 requests/sec - 18.9 kB/second - 17.8 kB/request - 43533.6 ms/request
20 requests currently being processed, 30 idle workers
Slot PID Stopping Connections Threads Async connections
total accepting busy idle writing keep-alive closing
0 3510778 yes (old gen) 4 no 0 0 0 0 0
1 3510779 yes (old gen) 3 no 0 0 0 0 0
2 3511915 yes (old gen) 2 no 0 0 0 0 0
3 402273 no 11 yes 12 13 0 0 0
4 81586 yes (old gen) 3 no 0 0 0 0 0
5 402274 no 9 yes 8 17 0 0 0
6 3614446 yes (old gen) 3 no 0 0 0 0 0
7 367731 yes (old gen) 4 no 0 0 0 0 0
8 367732 yes (old gen) 7 no 0 0 0 0 0
9 203769 yes (old gen) 4 no 0 0 0 0 0
10 178880 yes (old gen) 9 no 0 0 0 0 0
11 178881 yes (old gen) 13 no 0 0 0 0 0
12 3992043 yes (old gen) 8 no 0 0 0 0 0
13 3992044 yes (old gen) 3 no 0 0 0 0 0
14 4187117 yes (old gen) 5 no 0 0 0 0 0
15 4187118 yes (old gen) 6 no 0 0 0 0 0
Sum 16 14 94 20 30 0 0 0
..............G..................G..G............G..G...G.......
..........._______WW_W__W_WWW_WW_WWW.........G...............___
W_WWWW__WW_________W__GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG
GGGGG
-------------------------------------------------------------------------------
mod_fcgid status:
Total FastCGI processes: 0
-------------------------------------------------------------------------------
SSL/TLS Session Cache Status:
cache type: SHMCB, shared memory: 512000 bytes, current entries: 238
subcaches: 32, indexes per subcache: 88
time left on oldest entries' objects: avg: 57 seconds, (range: 1...195)
index usage: 8%, cache usage: 11%
total entries stored since starting: 51424
total entries replaced since starting: 0
total entries expired since starting: 51088
total (pre-expiry) entries scrolled out of the cache: 0
total retrieves since starting: 0 hit, 53 miss
total removes since starting: 98 hit, 4 miss
This is the current mpm settings
<IfModule mpm_event_module>
StartServers 2
MinSpareThreads 25
MaxSpareThreads 75
ThreadLimit 64
ThreadsPerChild 25
MaxRequestWorkers 150
MaxConnectionsPerChild 0
</IfModule>
The cpu and server load seems to be fine. I read I should increment
MaxRequestWorkers, but where can I find how much I can increment?
The log said to increment ServerLimit but I didn't find this setting,
so I guess it got the default value.
Thank you for any help.
Tobia
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