Hey,

I ran this over night with 24 feeds and the patch to
HAM wrt alert forwarding and it was stable. Had to
stop it now, but will try to pick up where I left today.
Anyway: good sign.

Thanks to all

On 14 Oct 2016, at 11:55, Heiko W.Rupp wrote:

On 11 Oct 2016, at 8:42, Heiko W.Rupp wrote:

Hey,

tl;dr: we need to investigate heap usage - especially in the case of compression
kicking in - it looks like there could be a memory leak. Compression timing seems
mostly ok.

Looks like we are making some progress

• metric forwarding to alerts seems to do some memory-wise heavy work, that can be reduced (hwkmetrics-507 and -508 and hawkular-1130 iirc)
• internal hsqldb uses a lot of memory
  • that is "only" a developer concern
• using postgres does not exhibit the memory usage for caching as does hsqldb, but
  • the postgres driver in inventory (v...1201) seems to use finalizers too much
    • we are investigating to use a newer driver that may perform better

I just replaced in a local copy inventory 0.20 with 0.19.3 and this seems to be
smoother sailing - a lot less finalizers that also hold less memory.

I did try to run with -XX:+UseStringDeduplication which requires -XX:+UseG1GC, but
according to MAT it did not have an effect for me. We may want to look into
string interning for the future like we did in JON.

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