Re: Archiver Appliance - Limit on PVs

[Eusebio Naif Al-Soliman Fuentes via Tech-talk <tech-talk at aps.anl.gov>]

Hello Sky.

 

Thanks for your response. I'll try to change those parameters to have a better performance.

 

Eusebio.

---

Saludos/Best regards

University of Granada  

Eusebio Naif Al-Soliman Fuentes
MSc. Data Science and Computer Engineering

eunaif at correo.ugr.es

El 2025-01-29 13:42, Sky Brewer via Tech-talk escribió:

Hi Eusebio,

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

https://urldefense.com/v3/__https://urldefense.us/v3/__https:/*github.com/archiver-appliance/epicsarchiverap/blob/master/src/sitespecific/default/classpathfiles/archappl.properties__;!!G_uCfscf7eWS!ZDBlyldkC0kJvuc3n8z9xDf3skxcaYxblRVjUpIv_HUnNRqJws62_802ixxkHU8RUJ4krRt2zdYohlEI__bIr9Wl$__;Lw!!D9dNQwwGXtA!T58fUAHdAiEMGLrplweuWWKWmq25Bc1fmc7tw6rFNfbGAiJ3dRsxVoRW9f8VeXnk2jdatboKLz6Xi1xUOoqVQ0bl$  

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