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https://issues.apache.org/jira/browse/DISPATCH-64?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14073500#comment-14073500
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Ted Ross commented on DISPATCH-64:
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The data structures listed in qdstat -m are allocated in batches and there are
free pools in each thread that uses the types. I suspect that the
batch-allocation accounts for the lack of smoothness that you see.
Is the RSS increasing smoothly? How many threads are running in the router?
> slow or sporadic memory leak
> ----------------------------
>
> Key: DISPATCH-64
> URL: https://issues.apache.org/jira/browse/DISPATCH-64
> Project: Qpid Dispatch
> Issue Type: Bug
> Reporter: michael goulish
>
> In long-term soak tests, I am seeing router mem grow by 1 megabyte every 4 or
> 5 minutes.
> Test setup
> =======================================
> 1. single router on one box
> 2. 10 senders, 10 receivers on separate box.
> 3. each client handles 100 unique addresses.
> 4. while test is running, I run 'top' in a loop to see router memory usage
> (resident set size). I also run "qdstat -m" in a loop, to see router's
> report on usage of various data structures.
> 5. clients all have single connection for duration of test.
> 6. clients start once at beginning of test and do not stop until end. No
> new clients are started after the beginning.
> 7. no clients failed during the test.
> 8. no new addresses were added after test startup.
> Observations
> =========================================
> 1. During a 64 minute period which started at least 15 minutes after the
> beginning of the test, memory usage (resident set size) as measured by 'top'
> grew from 96 to 109 megabytes.
> 2. Some of the data types reported by 'qdstat -m' increased. Here is the
> list: (using numbers from the 'total' column of qdstat report. )
> qd_connection_t 832 --> 896
> qd_hash_handle_t 1408 --> 1600
> qd_hash_item_t 1408 --> 1600
> qd_link_t 1536 --> 1664
> qd_log_entry_t 1152 --> 1216
> qd_message_content_t 10256 --> 10272
> qd_parsed_field_t 448 --> 1024
> qd_router_link_ref_t 1408 --> 1600
> qd_router_link_t 1536 --> 1664
> 3. The data structures that increased did *not* increase smoothly. For
> example, qd_hash_handle_t and qd_hash_item_t remained constant for 6 minutes
> before increasing.
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