[ovirt-users] Tunable parameters in ovirt engine

[Juan Hernández]

The first thing you will need to change for such a test is the number of 
simultaneous connections accepted by the Apache web server: by default 
the max is 256. See the Apache documentation here:

   https://httpd.apache.org/docs/2.4/mod/mpm_common.html#maxrequestworkers

In addition I also suggest that you consider using the "worker" 
multi-processing module instead of the "prefork", as it usually works 
better when talking to a Java application server, because it re-uses 
connections better.

On 03/07/2018 02:20 PM, Hari Prasanth Loganathan wrote:
> Hi Team,
> 
> *Description of problem:*
> 
> I am trying to achieve 1000 concurrent request to oVirt. What are the
> tunable parameters to achieve this?
> 
> I tried to perform the benchmarking for ovirt engine using Apache benchmark
> using the same SSO token.
> 
> ab -n 1000 -c 500 -k -H "accept: application/json" -H "Authorization:
> Bearer SSOTOKEN" https://172.30.56.70/ovirt-engine/
> <https://172.30.56.70/ovirt-engine/api/vms/5440271b-afb3-48bb-9ff1-076fc07ebf50/statistics>
> 
> When the number of concurrent request is 500, we are getting more than 100
> failures with the following error,
> 
> SSL read failed (1) - closing connection
> 139620982339352:error:
> 
> NOTE: It is scaling for concurrent request below 500.
> 
> I used the profiler to get the memory and CPU and it seems very less,
> 
>    PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+
> COMMAND
> 30413 ovirt     20   0 4226664 882396   6776 S 126.0 23.0  27:48.53 java
> 
> Configuration of the machine in which Ovirt is deployed :
> 
> RAM - 4GB,
> Hard disk - 100GB,
> core processor - 2,
> OS - Cent7.x.
> 
> In which 2GB is allocated to oVirt.
> 
> 
> Version-Release number of selected component (if applicable):
> 
> 4.2.2
> 
> 
> How reproducible:
> 
> If the number of concurrent requests are above 500, we are easily facing
> this issue.
> 
> 
> *Actual results:*
> 
> SSL read failed (1) - closing connection
> 139620982339352:error:
> 
> *Expected results:*
> 
> Request success.
> 
> 
> Thanks,
> Hari
> 
> 
> 
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