Kim van der Riet created QPID-7895:
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Summary: [linearstore] Excessive CPU utilization for some kernel
clocksources
Key: QPID-7895
URL: https://issues.apache.org/jira/browse/QPID-7895
Project: Qpid
Issue Type: Bug
Components: C++ Broker
Reporter: Kim van der Riet
Assignee: Kim van der Riet
For some kernel clocksources (eg acpi_pm), it has been observed that there is
an excessively high CPU utilization which correlates with the linearstore's
flush timeout being set to a very low value (100us). This is a problem for
some customers which require almost instant flush to obtain pseudo-synchronous
store behavior (hence the 100us flush timer) and run many brokers (up to
hundreds) on a single machine. In these cases, the CPU is 100% utilized.
A check of the source shows that the flush timer is firing continuously,
irrespective of whether any disk I/O has taken place.
It is proposed that a change to linearstore be made which will only run the
timer when needed (ie while there is content in the write buffers that needs
flushing).
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