Hi
guys,
I'm new to this list
an am also not really sure if it's the right one for my problem.
I'll ask
anyway but feel free to direct me elsewhere if I missed the list. I apologise
for the long post in advance, I'm trying to explain the problem the best I
can:
Background:
I have written a
simple HTTP server in Borland Delphi using Nevrona's Indy 10.x socket
components. From my server I am calling PHP 5.0.5 through it's php5isapi.dll. As
far as I know (MSDN documentation) I implemented all the functions required for
ISAPI plugin to work. PHP programs I wrote use mbstring and soap extensions.
Default and internal string encoding is UTF-8.
Now for the
problem:
PHP seems to loose
some 12 KB of RAM for each call I make to it. If that call originates from a new
thread each time, additional 100KB of RAM is taken. So my current solution just
makes sure the same worker threads always call PHP.I have determined this by
running a PHP script through my server some 1000 times and comparing initial /
ending mem usage of my server process in TaskManager. Those 12KB are variable
and range between 2.5 and 22KB depending on my computer's mood. I really
can't put it differently since I really don't know what governs this
variability. The code ran is always the same and scripts requested
too.
I compared these
figures with PHP running through Apache 2.x and it seems the Apache config
doesn't loose RAM like this. Of course, Apache version uses a different
interface. I didn't test this on IIS / PWS. I'm pretty sure it's PHP that's
loosing RAM since I only use Delphi's memory routines for allocation /
deallocation and Delphi memory manager does not detect any
leaks.
My original
implementation was through php5ts.dll (Serhiy Perevoznyk's classes), but that
one lost .5 MB per call initially and some 200KB after I debugged as much as I
knew to. Since I found that interface more complex I decided to write my own
ISAPI "server" in the hope of solving this problem. Providing it's source
for you to test is no problem.
I'm really sorry,
but I couldn't understand the php source code well enough to be able to pinpoint
the problem through reading it. I don't consider myself to be exactly C/C++
noob, but that code is just too advanced for me, not to mention
huge.
I have not detected
any unusual (not explained) calls to either of these
functions:
GetServerVariable
WriteClient
ReadClient
ServerSupportFunction
My only action for
calling PHP is setting up the ECB and then calling the httpfunc of the
lib.
Questions:
Has anybody noticed
this problem with ISAPI interface?
Is there a way to
get rid of this problem?
On the side note:
I'm not getting any logging information either in the form of filled out
ECB.lpszLogData nor through HSE_APPEND_LOG_PARAMETER command of
ServerSupportFunction. If I set PHP to log into a file, it will do so, but I'd
really like to log through my server. I'd like some pointers on that too if
possible.
Thanks for any
help,
Jure Erznoznik
Application developer
Jantar d.o.o.
