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* libpq++ memory problems
@ 2000-04-17 20:10 Tim Brookes <tim.brookes@mcmail.com>
2000-04-18 00:51 ` Re: libpq++ memory problems Tom Lane <tgl@sss.pgh.pa.us>
0 siblings, 1 reply; 6+ messages in thread
From: Tim Brookes @ 2000-04-17 20:10 UTC (permalink / raw)
To: pgsql-interfaces
I have written the following small piece of code to illustrate my
problem.
#include <pgsql/libpq++.h>
void callproc(){
PgDatabase* loStatsdb;
PgEnv loEnv("","","","","");
loStatsdb = new PgDatabase(loEnv,"ftldb");
delete loStatsdb;
};
main(){
while(1){
callproc();
};
};
The procedure 'callproc' is called in a continuous loop to emphasise
this problem. Within the procedure all that happens is a new database
connection is made and deleted. On my system this eats memory at an
enormous rate.
I do not know if this problem has been discussed before or fixed in
newer versions of the library (my apologies if it has), but I would be
most grateful of any info on resolving this memory leak.
Tim Brookes
^ permalink raw reply [nested|flat] 6+ messages in thread
* Re: libpq++ memory problems
2000-04-17 20:10 libpq++ memory problems Tim Brookes <tim.brookes@mcmail.com>
@ 2000-04-18 00:51 ` Tom Lane <tgl@sss.pgh.pa.us>
2000-04-20 07:59 ` Re: libpq++ memory problems Tim Brookes <tim.brookes@mcmail.com>
0 siblings, 1 reply; 6+ messages in thread
From: Tom Lane @ 2000-04-18 00:51 UTC (permalink / raw)
To: Tim Brookes <tim.brookes@mcmail.com>; +Cc: pgsql-interfaces
Tim Brookes <tim.brookes@mcmail.com> writes:
> The procedure 'callproc' is called in a continuous loop to emphasise
> this problem. Within the procedure all that happens is a new database
> connection is made and deleted. On my system this eats memory at an
> enormous rate.
I could not reproduce such a leak with current sources.
It appears that you are using a fairly old Postgres release --- class
PgEnv hasn't existed since at least release 6.4.*, maybe earlier.
I'd suggest upgrading...
regards, tom lane
^ permalink raw reply [nested|flat] 6+ messages in thread
* Re: libpq++ memory problems
2000-04-17 20:10 libpq++ memory problems Tim Brookes <tim.brookes@mcmail.com>
2000-04-18 00:51 ` Re: libpq++ memory problems Tom Lane <tgl@sss.pgh.pa.us>
@ 2000-04-20 07:59 ` Tim Brookes <tim.brookes@mcmail.com>
2000-04-20 15:06 ` Re: libpq++ memory problems Tom Lane <tgl@sss.pgh.pa.us>
0 siblings, 1 reply; 6+ messages in thread
From: Tim Brookes @ 2000-04-20 07:59 UTC (permalink / raw)
To: Tom Lane <tgl@sss.pgh.pa.us>; +Cc: pgsql-interfaces
OK
So I have downloaded and set up version 6.5.3 on a test system. I then
altered the code on the example so that it no longer uses the PgEnv class.
I set my environment variable and ran the program now as below. I still get
a huge memory leak.
Can I ask you what version you are using?
callproc(){
PgDatabase* loStatsdb;
loStatsdb = new PgDatabase("");
delete loStatsdb;
};
main(){
while(1){
callproc();
};
};
Rgds
Tim Brookes
Tom Lane wrote:
> Tim Brookes <tim.brookes@mcmail.com> writes:
> > The procedure 'callproc' is called in a continuous loop to emphasise
> > this problem. Within the procedure all that happens is a new database
> > connection is made and deleted. On my system this eats memory at an
> > enormous rate.
>
> I could not reproduce such a leak with current sources.
>
> It appears that you are using a fairly old Postgres release --- class
> PgEnv hasn't existed since at least release 6.4.*, maybe earlier.
> I'd suggest upgrading...
>
> regards, tom lane
^ permalink raw reply [nested|flat] 6+ messages in thread
* Re: libpq++ memory problems
2000-04-17 20:10 libpq++ memory problems Tim Brookes <tim.brookes@mcmail.com>
2000-04-18 00:51 ` Re: libpq++ memory problems Tom Lane <tgl@sss.pgh.pa.us>
2000-04-20 07:59 ` Re: libpq++ memory problems Tim Brookes <tim.brookes@mcmail.com>
@ 2000-04-20 15:06 ` Tom Lane <tgl@sss.pgh.pa.us>
2000-04-20 15:24 ` Re: libpq++ memory problems Tim Brookes <tim.brookes@mcmail.com>
0 siblings, 1 reply; 6+ messages in thread
From: Tom Lane @ 2000-04-20 15:06 UTC (permalink / raw)
To: Tim Brookes <tim.brookes@mcmail.com>; +Cc: pgsql-interfaces
Tim Brookes <tim.brookes@mcmail.com> writes:
> So I have downloaded and set up version 6.5.3 on a test system. I then
> altered the code on the example so that it no longer uses the PgEnv class.
> I set my environment variable and ran the program now as below. I still get
> a huge memory leak.
> Can I ask you what version you are using?
Current CVS sources --- ie, 7.0RC1 plus or minus a little bit. But as
far as I can tell from the CVS logs, not much has been done to libpq++
since 6.5; there's certainly nothing in the logs about fixing memory
leaks. So I'd have expected 6.5 to behave the same. Interesting.
> callproc(){
> PgDatabase* loStatsdb;
> loStatsdb = new PgDatabase("");
> delete loStatsdb;
> };
> main(){
> while(1){
> callproc();
> };
> };
AFAIR, my test program looked just like that except it specified a
database name --- new PgDatabase("dbname=regression") or some such.
I wonder if it could be platform- or configuration-specific. What
options did you give to configure?
regards, tom lane
^ permalink raw reply [nested|flat] 6+ messages in thread
* Re: libpq++ memory problems
2000-04-17 20:10 libpq++ memory problems Tim Brookes <tim.brookes@mcmail.com>
2000-04-18 00:51 ` Re: libpq++ memory problems Tom Lane <tgl@sss.pgh.pa.us>
2000-04-20 07:59 ` Re: libpq++ memory problems Tim Brookes <tim.brookes@mcmail.com>
2000-04-20 15:06 ` Re: libpq++ memory problems Tom Lane <tgl@sss.pgh.pa.us>
@ 2000-04-20 15:24 ` Tim Brookes <tim.brookes@mcmail.com>
2000-04-20 15:37 ` Re: libpq++ memory problems Lamar Owen <lamar.owen@wgcr.org>
0 siblings, 1 reply; 6+ messages in thread
From: Tim Brookes @ 2000-04-20 15:24 UTC (permalink / raw)
To: Tom Lane <tgl@sss.pgh.pa.us>; +Cc: pgsql-interfaces
Tom
I did not use configure - I downloaded a set of RPMs for 6.5.3
I then just changed the program not to require PgEnv and then compiled,linked with
the libpq++ library.
Maybe I should download the sources and compile on my system, but I dont see how
that will change what I see as momory not being released in the PgDatabase
destructor.
Rgds
Tim
Tom Lane wrote:
> Tim Brookes <tim.brookes@mcmail.com> writes:
> > So I have downloaded and set up version 6.5.3 on a test system. I then
> > altered the code on the example so that it no longer uses the PgEnv class.
> > I set my environment variable and ran the program now as below. I still get
> > a huge memory leak.
>
> > Can I ask you what version you are using?
>
> Current CVS sources --- ie, 7.0RC1 plus or minus a little bit. But as
> far as I can tell from the CVS logs, not much has been done to libpq++
> since 6.5; there's certainly nothing in the logs about fixing memory
> leaks. So I'd have expected 6.5 to behave the same. Interesting.
>
> > callproc(){
> > PgDatabase* loStatsdb;
>
> > loStatsdb = new PgDatabase("");
> > delete loStatsdb;
> > };
>
> > main(){
> > while(1){
> > callproc();
> > };
> > };
>
> AFAIR, my test program looked just like that except it specified a
> database name --- new PgDatabase("dbname=regression") or some such.
>
> I wonder if it could be platform- or configuration-specific. What
> options did you give to configure?
>
> regards, tom lane
^ permalink raw reply [nested|flat] 6+ messages in thread
* Re: libpq++ memory problems
2000-04-17 20:10 libpq++ memory problems Tim Brookes <tim.brookes@mcmail.com>
2000-04-18 00:51 ` Re: libpq++ memory problems Tom Lane <tgl@sss.pgh.pa.us>
2000-04-20 07:59 ` Re: libpq++ memory problems Tim Brookes <tim.brookes@mcmail.com>
2000-04-20 15:06 ` Re: libpq++ memory problems Tom Lane <tgl@sss.pgh.pa.us>
2000-04-20 15:24 ` Re: libpq++ memory problems Tim Brookes <tim.brookes@mcmail.com>
@ 2000-04-20 15:37 ` Lamar Owen <lamar.owen@wgcr.org>
0 siblings, 0 replies; 6+ messages in thread
From: Lamar Owen @ 2000-04-20 15:37 UTC (permalink / raw)
To: Tim Brookes <tim.brookes@mcmail.com>; +Cc: Tom Lane <tgl@sss.pgh.pa.us>; pgsql-interfaces
Tim Brookes wrote:
>
> Tom
>
> I did not use configure - I downloaded a set of RPMs for 6.5.3
> I then just changed the program not to require PgEnv and then compiled,linked with
> the libpq++ library.
To answer Tom's question:
> > I wonder if it could be platform- or configuration-specific. What
> > options did you give to configure?
To which I can answer, if it was my RPMset he downloaded:
CFLAGS="$RPM_OPT_FLAGS" ./configure --prefix=/usr \
--enable-hba --enable-locale \
--with-perl --with-mb=SQL_ASCII\
--with-tcl --with-tk --with-x \
--with-odbc --with-java \
--with-python
--
Lamar Owen
WGCR Internet Radio
1 Peter 4:11
^ permalink raw reply [nested|flat] 6+ messages in thread
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-- links below jump to the message on this page --
2000-04-17 20:10 libpq++ memory problems Tim Brookes <tim.brookes@mcmail.com>
2000-04-18 00:51 ` Tom Lane <tgl@sss.pgh.pa.us>
2000-04-20 07:59 ` Tim Brookes <tim.brookes@mcmail.com>
2000-04-20 15:06 ` Tom Lane <tgl@sss.pgh.pa.us>
2000-04-20 15:24 ` Tim Brookes <tim.brookes@mcmail.com>
2000-04-20 15:37 ` Lamar Owen <lamar.owen@wgcr.org>
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