[PD-dev] [ pure-data-Bugs-1891819 ] too many messages to NETSEND freeze pd forever (but 0% cpu)

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Bugs item #1891819, was opened at 2008-02-12 10:32
Message generated for change (Comment added) made by sistisette
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Category: puredata
Group: v0.40.1
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Matteo Sisti Sette (sistisette)
Assigned to: Nobody/Anonymous (nobody)
Summary: too many messages to NETSEND freeze pd forever (but 0% cpu)

Initial Comment:
If you send "too many" messages to netsend in zero logical time, PD immediately stops responding forever, WITHOUT eating up any cpu at all.

Attached patch illustrate the problem.
Click on the "connect" message box, and then on the [bng]

Note that it only happens if netsend is connected. If not connected, it will properly output all the "error: not connected" error messages.

Tested on Windows XP, Intel Core Duo.
PD-Vanilla 0.40.1


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>Comment By: Matteo Sisti Sette (sistisette)
Date: 2008-02-12 11:20

Message:
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Originator: YES

The problem seems to be in netreceive, not netsend.

I have tried by eliminating the netreceive, and using another application
to receive the data.
I increased the number of message sent by a factor of 30 and no problem.
Obviously netsend blocks for a considerable time, needed to send all the
data (a few seconds), but then PD works normally.

Another note: the critical amount of data needed to hang PD seems to be
dependent on the total size, not the number of messages (which is not
surprising), and seems to be around 32 kB (something more than 32kB
indeed).

May I guess it is an issue with some buffer that gets full?


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