Reduce hostd mem usage via event type filter#7001
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mdubya66 merged 3 commits intovmware:masterfrom Dec 29, 2017
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An alternative to increasing the collector page size. It will reduce the throughput to the event collector and hence reduce event misses. See issues vmware#6937 and vmware#6998
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Hypothesis is that it was primarily the reconfigure events that were overwhelming the heap due to associated config spec. This has not been confirmed by code inspection or similar, but this commit aims to experientially determine the impact on hostd memory. Experiments have shown that a filtered collector with pagesize of 200 has the same memory profile across full CI as the 1.2.1 release code with an unfiltered pagesize of 25 (maxes out at approx 125000). Without the filtering, significant deviation was observed.
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LGTM
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Merging to close the issue. |
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This bumps eventPageSize back to 200 to determine if the event type filter has significant effect on memory footprint of task history.
Having run full CI against this branch we saw a maximum of
124880which is directly inline with the numbers found for 1.2.1 full CI and an unfiltered pagesize of 25.The fact these two numbers are almost identical implies to me that we're not saturating the 25 pagesize in CI and in fact the number is dominated at this time by the taskRetention interval in hostd.
https://ci.vcna.io/vmware/vic/15511 is the CI build used for reference. There is a failure in the log test which looks like it's related to either a local stall or clock skew - will confirm once logs are uploaded.
@dougm has tests for the filtering in vmware/govmomi and I've confirmed that we're getting only the expected events delivered. The
docker psand out-of-band tests already exercise the function that events support.This is based off #7000 and should be merged instead of that, or after having dropped the govmomi portion of this PR.
Follow up for : #6886 and #6384