perfSONAR User Q&A and Other Discussion

[Andrew Lake <>]

On April 12, 2017 at 10:20:45 AM, Brian Candler () wrote:

On 12/04/2017 14:45, Andrew Lake wrote: 
> Basically you can tweak the MAX_HEAP_SIZE and HEAP_NEWSIZE variables 
> in /etc/cassandra/conf/cassandra-env.sh. It was largely trial and 
> error when I did it, but settled on MAX_HEAP_SIZE=512MB and 
> HEAP_NEWSIZE=256MB. Seemed to work ok in my case, but sure it depends 
> on machine load and otehr stuff, so likely you might have to tweak 
> those some. 

It looks like that has made a good improvement - I'm using a lot less 
swap now. Thank you! 

No problem, glad that helped.

Aside: did you ever look at using influxdb as a backend for perfsonar? 
Perhaps it wasn't around in the early days. However it's highly tuned 
for time-series data, and it compiles down to a standalone binary. 

https://docs.influxdata.com/influxdb/v1.2/ 

See "Concepts > Storage Engine" for some nice detail on the internal 
implementation. 

Yes, it comes up periodically. It falls into the bucket of some people like it, others have had bad experiences with it. A big feature of 4.0 is the ability to write “archiver” plug-ins to ship the data different places, so someone could write a plugin to ship it to influxdb (or maybe even use the rabbitmq archiver we already provide) to do so. 

Regards, 

Brian.