Re: Archiver Appliance - Limit on PVs

[Sky Brewer via Tech-talk <tech-talk at aps.anl.gov>]

Hi Eusebio,

 

You probably want to change some options in the properties file. The default file is at

 

https://github.com/archiver-appliance/epicsarchiverap/blob/master/src/sitespecific/default/classpathfiles/archappl.properties

 

Changing each property can then have different performance impact, for instance increasing org.epics.archiverappliance.config.PVTypeInfo.sampleBufferCapacityAdjustment

Will increase the memory usage.

 

You probably want to increase

 

org.epics.archiverappliance.mgmt.MgmtRuntimeState.archivePVWorkflowBatchSize

 

which has a default of 1000. It’s how many PVs are acceptable to be in the intialSampling stage.

 

And decrease

 

org.epics.archiverappliance.mgmt.bpl.ArchivePVAction.minimumSamplingPeriod = 0.1

 

which specifies the minimumSamplingPeriod.

 

In some sense there is not a limit on how small this can be, it’s more how much memory you have for the Archiver Appliance to run to. If you saturate the memory, then it will start dropping events.

 

Hope this helps

 

Sky