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https://issues.apache.org/jira/browse/ARTEMIS-1977?focusedWorklogId=190381&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-190381
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ASF GitHub Bot logged work on ARTEMIS-1977:
-------------------------------------------
Author: ASF GitHub Bot
Created on: 26/Jan/19 10:30
Start Date: 26/Jan/19 10:30
Worklog Time Spent: 10m
Work Description: franz1981 commented on issue #2523: ARTEMIS-1977
ASYNCIO can reduce sys-calls to retrieve I/O events
URL: https://github.com/apache/activemq-artemis/pull/2523#issuecomment-457811530
@michaelandrepearce
> whats the compatibility of using the c++ c11 features
I don't know , that' s why I've implemented the barriers by myself, instead
of using the ones provided by C11. Re the barriers I've implemented they work
for any x86_64 platform (the version of Linux won't make any difference,
because I'm not using OS features, but just arch-specific instructions).
I could provide an implementation of x86 (32 bit) and we won't need any
support (+ eventual incompatibilities) of C11.
@clebertsuconic @michaelandrepearce Related to the OS compatibility of
stealing kernel space info from user space: the ring buffer layout is part of
the linux ABI.
There are quite few already existing uses of this optimizations: ScyllaDB
(Cassandra replacement written in C++), QEMU (Linux virtualizer) and FIO (a
file system benchmark tool).
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Issue Time Tracking
-------------------
Worklog Id: (was: 190381)
Time Spent: 3h 10m (was: 3h)
> ASYNCIO can reduce sys-calls to retrieve I/O events
> ---------------------------------------------------
>
> Key: ARTEMIS-1977
> URL: https://issues.apache.org/jira/browse/ARTEMIS-1977
> Project: ActiveMQ Artemis
> Issue Type: Improvement
> Components: Broker
> Affects Versions: 2.6.2
> Reporter: Francesco Nigro
> Assignee: Francesco Nigro
> Priority: Minor
> Fix For: 2.7.0
>
> Time Spent: 3h 10m
> Remaining Estimate: 0h
>
> On LibAIO is possible to retrieve the I/O completion events without
> using io_getevents sys-calls by reading the user-space ring buffer used by the
> kernel to store them.
> This is already beneficial for very fast disks and necessary for further
> improvements
> of ASYNCIO Journal to leverage (very) fast low-latency disks by going
> completly
> lock-free.
>
>
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