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https://issues.apache.org/jira/browse/ARTEMIS-1977?focusedWorklogId=191439&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-191439
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ASF GitHub Bot logged work on ARTEMIS-1977:
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Author: ASF GitHub Bot
Created on: 29/Jan/19 06:04
Start Date: 29/Jan/19 06:04
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-458418530
@michaelandrepearce @clebertsuconic
Today I will talk with some of the kernel guys that has written libAIO: I've
taken a deep look to
https://elixir.bootlin.com/linux/latest/source/fs/aio.c#L1148 and seems that
for x86 I could avoid any hardware barriers.
`lfence,sfence` are hw barriers needed just when used among non-temporal
stores ie that won't use the caches, while temporal x86 stores are guaranteed
to not being reordered by the processor.
I need to cross-compile the 32 bit version accordly, many thanks to super-
@orpiske for his help!
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Issue Time Tracking
-------------------
Worklog Id: (was: 191439)
Time Spent: 4h 20m (was: 4h 10m)
> 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: 4h 20m
> 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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