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From "Chuck Rolke (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DISPATCH-760) Inefficiencies handling message annotations
Date Mon, 01 May 2017 19:49:04 GMT
Chuck Rolke created DISPATCH-760:
------------------------------------

             Summary: Inefficiencies handling message annotations
                 Key: DISPATCH-760
                 URL: https://issues.apache.org/jira/browse/DISPATCH-760
             Project: Qpid Dispatch
          Issue Type: Bug
    Affects Versions: 0.8.0
         Environment: Fedora 25 laptop
Single router, 8 worker threads, single receiver, single sender. Messages have 200 100-byte
annotations.
            Reporter: Chuck Rolke


The router as a whole spends a lot of time managing annotations. With routers and other intermediaries
adding and stripping annotations, improvements in this area could be valuable.

Testing a stand-alone router gets these results.

||N 100-byte annotations || msg/S throughput||
|    0 | 30,000 |
|    1 | 22,500 |
|    2 | 20,500 |
|    5 | 15,500 |
|  10 | 10,000 |
|  20 |  5,500 |
|  50 |  2,400 |
| 100 | 1,200 |
| 200 |    500 |

Application 'perf' provides some visibility into where the threads are spending their time.
View the attached .svg files to see what the core thread and an aggregation of the remaining
threads are busy doing.

The worker threads are spending ~85% of their time composing messages while the core thread
is spending 90+% of its time deleting deliveries with a majority of its time in qd_parse_free().

A 'top' thread snapshot shows several worker threads completely idle. The core thread has
tid=32631.
{noformat}
  PID USER      PR  NI    VIRT    RES    SHR S %CPU %MEM     TIME+ COMMAND
32633 chug      20   0  858376 137708   8484 R 26.7  0.9   0:33.99 qdrouterd
32632 chug      20   0  858376 137708   8484 S 20.0  0.9   0:34.63 qdrouterd
32631 chug      20   0  858376 137708   8484 S 13.3  0.9   0:30.13 qdrouterd
32635 chug      20   0  858376 137708   8484 R 13.3  0.9   0:34.26 qdrouterd
32636 chug      20   0  858376 137708   8484 S 13.3  0.9   0:34.80 qdrouterd
32638 chug      20   0  858376 137708   8484 S 13.3  0.9   0:34.34 qdrouterd
32616 chug      20   0  858376 137708   8484 S  6.7  0.9   0:35.48 qdrouterd
32634 chug      20   0  858376 137708   8484 S  6.7  0.9   0:34.09 qdrouterd
32637 chug      20   0  858376 137708   8484 S  6.7  0.9   0:34.42 qdrouterd
{noformat}





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