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[LDM #ZRR-161467]: product latency and backlog of data to be inserted to LDM Q during peak loads
- Subject: [LDM #ZRR-161467]: product latency and backlog of data to be inserted to LDM Q during peak loads
- Date: Thu, 05 Jun 2014 12:26:08 -0600
Khang,
EXECing a program from the LDM configuration-file puts the process in the
process-group of the LDM server; consequently, the SIGCONT signal sent by the
product-queue library when a data-product is inserted into the product queue
will be seen by all processes in the LDM process-group. This makes data-product
delivery event-driven and results in low latencies.
> EXEC "/home/ldm/bin/sendprod /dev/shm /dev/shm/prodflist 10 FT27
> >/var/opt/ldm/l
> ogs/sendprod.out 2>/var/opt/ldm/logs/sendprod.err"
>
> what's the benefit of exec'ing a program in ldmd.conf ?
>
> line 21 in sendprod invokes piperead which removes data from the pipe-file
>
> ps -e|fgrep -q piperead || \
> (rm -f $pfil;piperead -p/var/opt/ldm/NEXRD3/output_pipe -o$pfil &
> sleep $ptim)
>
> thanks
Regards,
Steve Emmerson
Ticket Details
===================
Ticket ID: ZRR-161467
Department: Support LDM
Priority: Normal
Status: Closed
