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https://issues.apache.org/jira/browse/DISPATCH-2121?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17345979#comment-17345979
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Jiri Daněk commented on DISPATCH-2121:
--------------------------------------
There are benefits from simply enabling LTO within Dispatch and also from
enabling {{-fno-semantic-interposition}} [1]. This is beneficial even when
Proton is linked dynamically. The semantic interposition option can have
negative impact on DISPATCH-1783 (interposition is the mechanism to reconfigure
program at runtime and inject mocks), but that's something that can be resolved
when the time comes (turn interposition back on when intending to run
unittests). Interposition is disabled by default on Clang.
[1] https://fedoraproject.org/wiki/Changes/PythonNoSemanticInterpositionSpeedup
Before
{noformat}
% iperf3 -c 127.0.0.1 -p 5202
Connecting to host 127.0.0.1, port 5202
[ 5] local 127.0.0.1 port 44890 connected to 127.0.0.1 port 5202
[ ID] Interval Transfer Bitrate Retr Cwnd
[ 5] 0.00-1.00 sec 45.0 MBytes 377 Mbits/sec 0 1.25 MBytes
[ 5] 1.00-2.00 sec 38.8 MBytes 325 Mbits/sec 0 1.25 MBytes
[ 5] 2.00-3.00 sec 51.2 MBytes 430 Mbits/sec 0 1.25 MBytes
[ 5] 3.00-4.00 sec 52.5 MBytes 440 Mbits/sec 0 1.25 MBytes
[ 5] 4.00-5.00 sec 46.2 MBytes 388 Mbits/sec 0 1.25 MBytes
[ 5] 5.00-6.00 sec 46.2 MBytes 388 Mbits/sec 0 1.25 MBytes
[ 5] 6.00-7.00 sec 47.5 MBytes 398 Mbits/sec 0 1.25 MBytes
[ 5] 7.00-8.00 sec 51.2 MBytes 430 Mbits/sec 0 1.25 MBytes
[ 5] 8.00-9.00 sec 53.8 MBytes 451 Mbits/sec 0 1.25 MBytes
[ 5] 9.00-10.00 sec 48.8 MBytes 409 Mbits/sec 0 1.25 MBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.00 sec 481 MBytes 404 Mbits/sec 0 sender
[ 5] 0.00-10.00 sec 474 MBytes 397 Mbits/sec receiver
iperf Done.
{noformat}
After
{noformat}
% iperf3 -c 127.0.0.1 -p 5202
Connecting to host 127.0.0.1, port 5202
[ 5] local 127.0.0.1 port 45122 connected to 127.0.0.1 port 5202
[ ID] Interval Transfer Bitrate Retr Cwnd
[ 5] 0.00-1.00 sec 66.2 MBytes 556 Mbits/sec 0 1.19 MBytes
[ 5] 1.00-2.00 sec 56.2 MBytes 472 Mbits/sec 0 1.19 MBytes
[ 5] 2.00-3.00 sec 63.8 MBytes 535 Mbits/sec 0 1.19 MBytes
[ 5] 3.00-4.00 sec 58.8 MBytes 493 Mbits/sec 0 1.19 MBytes
[ 5] 4.00-5.00 sec 57.5 MBytes 482 Mbits/sec 0 1.19 MBytes
[ 5] 5.00-6.00 sec 62.5 MBytes 524 Mbits/sec 0 1.19 MBytes
[ 5] 6.00-7.00 sec 60.0 MBytes 503 Mbits/sec 0 1.19 MBytes
[ 5] 7.00-8.00 sec 61.2 MBytes 514 Mbits/sec 0 1.19 MBytes
[ 5] 8.00-9.00 sec 60.0 MBytes 503 Mbits/sec 0 1.19 MBytes
[ 5] 9.00-10.00 sec 61.2 MBytes 514 Mbits/sec 0 1.19 MBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.00 sec 608 MBytes 510 Mbits/sec 0 sender
[ 5] 0.00-10.00 sec 599 MBytes 503 Mbits/sec receiver
{noformat}
So enabling LTO and turning interposition seems to be worth doing.
> Investigate whether there might be benefits from LTO-ing Proton into Dispatch
> -----------------------------------------------------------------------------
>
> Key: DISPATCH-2121
> URL: https://issues.apache.org/jira/browse/DISPATCH-2121
> Project: Qpid Dispatch
> Issue Type: Task
> Affects Versions: 1.16.0
> Reporter: Jiri Daněk
> Assignee: Jiri Daněk
> Priority: Major
> Fix For: 1.17.0
>
>
> https://stackoverflow.com/questions/25878407/how-can-i-use-lto-with-static-libraries
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