Hi
I've recently managed to reliably reproduce all the heavy loading
symptoms we have recently been experiencing using some stress testing
software.
(The 'heavy loading' scenario' happens when customer sends out 60,000
e-mailings to tell their customers that the January bike sale is
starting the next day. Thousands of them connect the next morning
trying to pick up bargains).
There are exactly 4 symptoms which consistently manifest themselves:
1] - dropped connections (Safari for example reports this error):
. . . Safari can’t open the page “http://192.168.1.66/
ebwPNLqrymode.a4p?f%5FProductID=0&f%5FWebLinkID=3129&f%
5FSortOrderID=0&f%5Fbct=c003129” because it could not connect to the
server “192.168.1.66” . . .
2] - dropped images all over the place
3] - pages appearing without stylesheet applied
4] - up to 40 second response times (reportedly, at worst). I can
only reproduce 5-10 second response times at worst, but the page only
loads every 5th attempt or so.
When I drop the load, everything returns to normal.
On the load test, the stress testing package reports about 84%
'Socket Errors'. Can anyone throw any more light on this with respect
to how 4D behaves, namely:
- what exactly is a 'socket error', is it an OS level problem,
nothing to do with 4D? or a 4D overload ?
- are there any settings in 4D Prefs (or OS prefs) which can
influence this aspect of performance ? (e.g. Max web processes,
Number of requests per connection etc)
b.t.w, when I tried this last using my Mac Powerbook as a web server,
I didn't experience anything like the dropped connections, just slow
page loading (and that's what I'm looking for).
Environment:
4D 2004.5 Windows (Standalone & Client Server [Client as web server])
Active 4D 4.2
Many thanks
Peter
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