Add an optional task dumper thread

Creates an optional thread whose job is simply to poll for the existence of the file .dump in the current directory. When this file is found dumps of all the unskipped tasks and uncompleted entries in the queues is made, as is a dump of memory use, if --enable-memuse-reports was configured. Once the dump is complete the .dump file is removed and the application will just continue so must be killed normally, or can be dumped at a later time (this feature is aimed at checking deadlocks of the engine tasks, so not clear if that would be useful).

Uses configure flag --enable-dumper to enable, so not always available, so you need to catch the problem at least twice, but reliably works, unlike the signals version !857 (closed).

mentioned in merge request !857 (closed)

mentioned in issue #597 (closed)

unmarked as a Work In Progress

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assigned to @nnrw56

One to look at sometime. No urgency.

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• 3116c16f - Also add rank of the pair, so we know where the message is going

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mentioned in issue #584

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• 6248a70e - Add function to dump all the queues and add to the dumper thread
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• 9a5680fe - Make sure the .dump file is removed when starting, if not that can give funny effects

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changed the description

Added a dump of the queues as well, that is interesting rarely seen information.

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• 705f24b3 - Output weight not wait!

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@matthieu this may interest you as well.

Interested indeed and very useful from the results you showed last week. No comments from my side. Thanks!

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