I'm running Apache2 on a Debian 11 VPS. I've written an API, and I'm trying to stress test it via an external server using ApacheBench.
With mpm_prefork enabled and php8.0-fpm disabled, the 95th percentile response times are around 30ms. The output is as follows:
Server Software: Apache/2.4.52
Server Hostname: XXX.XXX.com
Server Port: 443
SSL/TLS Protocol: TLSv1.2,ECDHE-RSA-AES256-GCM-SHA384,4096,256
Server Temp Key: X25519 253 bits
TLS Server Name: XXX.XXX.com
Document Path: /v1/module
Document Length: 370 bytes
Concurrency Level: 100
Time taken for tests: 2.783 seconds
Complete requests: 1000
Failed requests: 0
Keep-Alive requests: 1000
Total transferred: 845001 bytes
HTML transferred: 370000 bytes
Requests per second: 359.28 [#/sec] (mean)
Time per request: 278.336 [ms] (mean)
Time per request: 2.783 [ms] (mean, across all concurrent requests)
Transfer rate: 296.48 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 14 157.2 0 2295
Processing: 17 26 3.3 25 44
Waiting: 17 26 3.3 25 44
Total: 17 40 157.8 25 2330
Percentage of the requests served within a certain time (ms)
50% 25
66% 26
75% 27
80% 28
90% 30
95% 33
98% 41
99% 282
100% 2330 (longest request)
With mpm_prefork still enabled but switching over to php8.0-fpm, the response times become ridiculous. The output is as follows:
Server Software: Apache/2.4.52
Server Hostname: XXX.XXX.com
Server Port: 443
SSL/TLS Protocol: TLSv1.2,ECDHE-RSA-AES256-GCM-SHA384,4096,256
Server Temp Key: X25519 253 bits
TLS Server Name: XXX.XXX.com
Document Path: /v1/module
Document Length: 370 bytes
Concurrency Level: 100
Time taken for tests: 12.595 seconds
Complete requests: 1000
Failed requests: 0
Keep-Alive requests: 0
Total transferred: 788000 bytes
HTML transferred: 370000 bytes
Requests per second: 79.39 [#/sec] (mean)
Time per request: 1259.549 [ms] (mean)
Time per request: 12.595 [ms] (mean, across all concurrent requests)
Transfer rate: 61.10 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 91 1152 619.3 1108 4744
Processing: 22 46 39.0 32 850
Waiting: 21 43 27.4 31 491
Total: 121 1198 623.4 1146 4784
Percentage of the requests served within a certain time (ms)
50% 1146
66% 1298
75% 1668
80% 1796
90% 1992
95% 2053
98% 2190
99% 3017
100% 4784 (longest request)
I'm running Apache/2.4.52 (Debian) and PHP 8.0.14 (cli). The goal is to start using mpm_event instead of mpm_prefork, to enable a lot of concurrent connections for my API. I can't start doing this with such load times though.
How can I switch to php-fpm, without ruining my load times? My php-fpm settings are as follows:
pm.max_children = 844
pm.start_servers = 16
pm.min_spare_servers = 8
pm.max_spare_servers = 16
pm.max_requests = 1000
