Collector Heap Memory Usage and Class Cache

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Question by YC M. · Oct 01, 2015 at 05:36 PM · collector

Collector Heap Memory Usage and Class Cache

One of our collectors' memory usage always trigger the diable new agents instrument alert. From dynatrace selef-monitoring, we can find the memory heap utilization is between 80% to 90%. We have 860MB class cache and 2GB memory heap. The question is what else are using collecotor memory beside class cache?

Thanks

YC

2015-10-01-13h40-37.png (67.6 KiB)

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Rick B. · Oct 01, 2015 at 05:44 PM 0

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What version of DT? There's a fix for a similar pattern in 6.2.2

YC M. Rick B. · Oct 01, 2015 at 05:47 PM 0

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Hi Richard,

Thank you for promoted reply. We are using 6.1.0.8305. Do you mean that's a known issue?

Thanks

YC

Rick B. YC M. · Oct 01, 2015 at 05:51 PM 0

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Hm, I think the issue happened only in 6.2 so that may not be your issue. Depending on number of agents you may want/need to increase the heap size if you can. Consider opening a support ticket

Answer 1 · 2015-10-01T17:49:57Z

Best Answer

Answer by Rick B. · Oct 01, 2015 at 05:49 PM

This is a known issue at least in 6.2 and fixed in 6.2.2 update. From the release notes:

JLT-133458: High Collector memory usage due to incorrect cache sizing
- Impact: Collector uses too much memory, which might cause Agents to be declined
- Cause: Wrong debug flag constant was used for cache sizing
- Solution: Using correct debug flag now

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Collector Heap Memory Usage and Class Cache

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