https://bz.apache.org/bugzilla/show_bug.cgi?id=53999
--- Comment #9 from David MartÃnez Martà <deavidsed...@gmail.com> ---
Thomas, we were getting the same problem, and your comment helped a lot.
"Mutex sem" seems the solution.
Did two tests in siege using this command:
siege -f /tmp/urls.sort1.awk.txt -i -d0 -c20 -v | grep -vE "200 [01]"
I did only a change between first and second test: /etc/apache2/apache2.conf
# Mutex file:${APACHE_LOCK_DIR} default # Original config (1st Test)
Mutex sem # (Config 2nd test)
In the first siege test:
Transactions: 32958 hits
Availability: 99.43 %
Elapsed time: 115.76 secs
Data transferred: 14.80 MB
Response time: 0.07 secs
Transaction rate: 284.71 trans/sec
Throughput: 0.13 MB/sec
Concurrency: 19.42
Successful transactions: 32960
Failed transactions: 189
Longest transaction: 8.96
Shortest transaction: 0.00
In 115 seconds I had to stop because I got 115 PHP orphaned processes.
In the second siege test:
Transactions: 99533 hits
Availability: 99.98 %
Elapsed time: 292.05 secs
Data transferred: 44.50 MB
Response time: 0.05 secs
Transaction rate: 340.81 trans/sec
Throughput: 0.15 MB/sec
Concurrency: 17.80
Successful transactions: 99533
Failed transactions: 21
Longest transaction: 29.04
Shortest transaction: 0.00
After 5 minutes and 0 zombies and 0 orphaned processes.
As you can see it is slightly faster than the prior configuration. And 0.02%
failure, which is 10x times less than before.
I'm using Debian Jessie, kernel 4.4.4-xxxx-grs-ipv6-64 #7 SMP x86_64 GNU/Linux
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