Dave, thanks, I have about 6 CGI's regularly appearing as hung.
Some show up only once a week.
The guestbook.cgi is very high traffic. A sweet spot for spammmers
and I don't know what happens if someone tries to dump a huge
chunk of data into the comments field (I used to see that a lot
before we implemented the captcha visual check) he regularly hangs
at least once in 72 hours... so I will test this solution on that one
and if it doesn't appear again in one week we know we nailed it.
Questions below....
ps. to Bernard... suggestion on logs. good one! I'll do it. tks
At least this dual XEON box has four CPU's....otherwise
our web site(s) would have died a long time ago on this problem.
On 5 May 2007, at 23:09, Sivakatirswami wrote:
repeat until length(PostIn) >= $CONTENT_LENGTH
read from stdin until ""
put it after PostIn
end repeat
Dave Cragg wrote:
I'd suspect this part. I used to use this approach, but ran into trouble
after moving some scripts to a new server. If something happens to stall
the connection during the read process, you'll be in an endless loop,
possibly with high CPU usage.
I've started using something like this. It puts a limit on how many
"empty reads" happen before bailing out. (I copied this quickly, and
modified slightly to remove some application specific code. Check before
using.):
local sPostdata = ""
local sDataRead = false
local sReadCount = 0
local sEmptyReadCount = 0
local sEmptyReadLimit = 200
local sShortRead = false
on startup
readData
repeat while sDataRead = false
wait for messages
end repeat
## skts: I don't understand "wait for messages" what does that do?
## The rest of this is quite transparent.
if sShortRead then
## exit routine needed here
# a good place to use Bernard's log suggestion...
# which will also help confirm that this is the culprit.
end if
## carry on
end startup
on readData
read from stdin for $CONTENT_LENGTH
put it into tTemp
add 1 to sReadCount
if tTemp <> empty then
put tTemp after sPostdata
else
add 1 to sEmptyReadCount
end if
if length(sPostdata) < $CONTENT_LENGTH then
if sEmptyReadCount < sEmptyReadLimit then
send readData to me in 50 milliseconds
else
put true into sDataRead
put true into sShortRead
end if
else
put true into sDataRead
end if
end readData
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www.himalayanacademy.com
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