problems benchmarking php-fpm/proxy_fcgi with h2load

[Hajo Locke <Hajo.Locke@xxxxxx>]

Hello list,

i do some http/2 benchmarks on my machine and have problems to finish at 
least one test.

System is Ubuntu16.04, libnghttp2-14 1.7.1, Apache 2.4.29, mpm_event

I start h2load with standard-params:

h2load  -n100000 -c100 -m10 https://example.com/phpinfo.php

first steps are really quick and i can see a progress to 50-70%. but 
after that requests by h2load to server decrease dramatically.
it seems that h2load ist stopping requests to server, but i dont see any 
reason for that on serverside. i can start a 2nd h2load and this is 
starting furious again, while the first one stucks with no progress, so 
i can't believe there is a serverproblem.

all serverconfigs are really high, to avoid any kind of bottleneck.

/etc/apache2/conf.d/limits.conf
StartServers          10
MaxClients          500
MinSpareThreads      450
MaxSpareThreads      500
ThreadsPerChild      150
MaxRequestsPerChild   0
Serverlimit 500

my test-vhost just has some default values like servername, docroot etc. 
additional there is the proxy_fcgi config
<Proxy "unix:/dev/shm/php70fpm.sock|fcgi://php70fpm/">
    ProxySet enablereuse=on flushpackets=On timeout=3600 max=1500
</Proxy>
<FilesMatch \.php$|\.php70$>
   SetHandler "proxy:fcgi://php70fpm/"
</FilesMatch>

fpm-config also has high limits to serve every incoming connection:
request_terminate_timeout = 7200
security.limit_extensions = no
listen = /dev/shm/php70fpm.sock
listen.owner = myuser
listen.group = mygroup
listen.mode = 0660
user = myuser
group = mygroup
pm = ondemand
pm.max_children = 500
pm.max_requests = 2000
catch_workers_output = yes

Currently i have no explanation for this. a really fast start and then 
decreasing to low-activity.  but i cant see that limits are reached or 
processes not respond.
Possible to have a problem in h2load or a hidden problem in my 
configuration? Is there an other recommend way to do a h2-speedbenchmarking?

before using proxy_fcgi i used the classical mod_fastcgi with 
fastcgiexternalserver and did not have this kind of problems. with 
mod_fastcgi the test could complete.
Currently iam stumped and need a hint please.

Thanks,
Hajo


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