Hi Nick,
Actually, TBL is set up basically the way you helped me set it up
about a year ago. I think it is just tomcat, right?
It’s running on an AWS instance t2.large (8GB memory).
Please let me know if you need me to send you screen shots, etc.
The paralysis seems to possibly be related to a call that invokes SPIN
reasoning followed by an INSERT to a .tdb data store, immediately followed by a
call to a different service that executes a SELECT on that same data. I’m
presuming that the second (and subsequent) calls would wait until the first is
finished…
- Steve
Steven R. Ray, Ph.D.
Distinguished Research Fellow
Carnegie Mellon University
NASA Research Park
Building 23 (MS 23-11)
P.O. Box 1
Moffett Field, CA 94305-0001
Email: [email protected]
Phone: (650) 587-3780
Cell: (202) 316-6481
Skype: steverayconsulting
cid:[email protected]
From: [email protected] [mailto:[email protected]]
On Behalf Of Nick Abston
Sent: Friday, May 25, 2018 8:02 PM
To: [email protected]
Cc: Dimitrios Tzannetos; Xia, Brian; HODGES Jr, John
Subject: Re: [topbraid-users] TBL receiving multiple web-service (SPARQLMotion)
calls near the same time
Hi Steve,
There are many layers that can bottleneck requests as you describe. Some may
be out of the context of the webapp itself (TopBraid).
Can you describe if Tomcat is directly being called for these requests - or -
is there a proxy frontend, such as Apache httpd?- if so what are the Apache
VirtualHost (vhost) configs?
What version of TopBraid is being used?
What are the specifics of the tomcat and it's host?
eg: JVM memory parameters, host details such as CPU and memory specifations.
Thanks
Nick
On Fri, May 25, 2018, 6:14 PM Steve Ray (CMU) <[email protected]> wrote:
Hi,
We’re standing up TBL for our research project that will be
receiving some calls from various processes in bursts. Possibly around 25
distinct invocations within a few milliseconds. We’re noticing that it seems to
get paralyzed and never returns when this happens. I’m assuming you all have
thought of this. Right? Isn’t there some sort of buffering so that it can stand
up to a burst?
- Steve
Steven R. Ray, Ph.D.
Distinguished Research Fellow
Carnegie Mellon University
NASA Research Park
Building 23 (MS 23-11)
P.O. Box 1
Moffett Field, CA 94305-0001
Email: [email protected]
Phone: (650) 587-3780
Cell: (202) 316-6481
Skype: steverayconsulting
cid:[email protected]
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