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https://issues.apache.org/jira/browse/PROTON-2321?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17325302#comment-17325302
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ASF subversion and git services commented on PROTON-2321:
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Commit c90a881af16e643128795353df92c2c1835ead81 in qpid-proton's branch
refs/heads/main from Jiri Daněk
[ https://gitbox.apache.org/repos/asf?p=qpid-proton.git;h=c90a881 ]
PROTON-2321 Add benchmark for pn_data_t initialization from PROTON-2229 (#286)
> Add benchmark for pn_data_t initialization (PROTON-2229)
> --------------------------------------------------------
>
> Key: PROTON-2321
> URL: https://issues.apache.org/jira/browse/PROTON-2321
> Project: Qpid Proton
> Issue Type: Test
> Components: proton-c
> Affects Versions: proton-c-0.33.0
> Reporter: Jiri Daněk
> Assignee: Jiri Daněk
> Priority: Major
> Fix For: proton-c-0.35.0
>
>
> {noformat}
> -----------------------------------------------------------------------------------
> Benchmark Time CPU
> Iterations
> -----------------------------------------------------------------------------------
> // size_t size = bytes->size + 0;
> BM_Encode10MbMessage/put_binary count:1 71.7 ms 70.4 ms
> 10
> BM_Encode10MbMessage/put_binary count:10 239 ms 205 ms
> 3
> // size_t size = bytes->size + 1;
> BM_Encode10MbMessage/put_binary count:1 1.25 ms 0.874 ms
> 744
> BM_Encode10MbMessage/put_binary count:10 1059 ms 1045 ms
> 1
> // size_t size = bytes->size + 2;
> BM_Encode10MbMessage/put_binary count:1 1.22 ms 0.916 ms
> 634
> BM_Encode10MbMessage/put_binary count:10 178 ms 135 ms
> 5
> // size_t size = pn_max(bytes->size+1, PNI_INTERN_MINSIZE);
> BM_Encode10MbMessage/put_binary count:1 0.941 ms 0.815 ms
> 783
> BM_Encode10MbMessage/put_binary count:10 1390 ms 1187 ms
> 1
> // size_t size = pn_max(bytes->size+2, PNI_INTERN_MINSIZE);
> BM_Encode10MbMessage/put_binary count:1 0.922 ms 0.811 ms
> 718
> BM_Encode10MbMessage/put_binary count:10 184 ms 144 ms
> 5
> {noformat}
> The above shows that + 1 improves things significantly, but there is a
> scenario where + 2 is even better.
> {code}
> static int pni_data_intern_node(pn_data_t *data, pni_node_t *node)
> {
> pn_bytes_t *bytes = pni_data_bytes(data, node);
> if (!bytes) return 0;
> if (data->buf == NULL) {
> // Heuristic to avoid growing small buffers too much
> // size + 1 to allow for zero termination
> size_t size = pn_max(bytes->size+1, PNI_INTERN_MINSIZE);
> ...
> {code}
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