Hi Carlos,
At a guess (although I cannot be sure without seeing the source), SwiftMQ is
obtaining 4,000 file descriptors for each of the persistent messages at
start-up, but it is failing to release the descriptors in enough time. Your
version of NT may cap the maximum number of open files at 4,000. If you hit
the upper open file descriptor limit then the OS is almost certainly likely
to thrash as it searches for descriptors for socket connections etc.
Does this help?
--Mario Gianota
----- Original Message -----
From: Carlos <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, June 11, 2001 6:01 AM
Subject: [developers] Router appears to hang when it's started with large
persistent store
> When our router is started with > 4K existing persistent messages it
appears
> to 'hang' when the first client attempts a receive. When this happens the
> router appears busy thrashing the hard-disk and continues to do until we
> kill it
>
> If we halt the router, delete messages to reduce the message count below
4K
> and restart then everything works normally again. (even when the message
> count grows above 4K). The only time we seem to get this problem is when
we
> start the router with an existing store > 4K messages.
>
> We've been able to replicate this problem with v2.0.0 and v2.1.1 in two
> different environments (both NT).
>
> We've tried;
> - Ensuring that flow control is disabled for the queue and to be extra
> paranoid we've increased the flow control start size to 100K messages.
> - Setting the min consumer threads to 10 and the max consumer threads
> to -1
> - Making sure the router has more than enough disk space and that memory
> isn't an issue.
> - Setting the default (and queue specific) cleanup interval to 1 hour
> - Checking the router logs but found no indication of a problem.
>
> Anything else we should have tried ? Any help appreciated.
>
> Carlos.
>
>
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