Re: [PERFORM] Sun performance - Major discovery! - Mailing list pgsql-hackers

On Wed, 2003-10-08 at 21:44, Bruce Momjian wrote:
> Agreed.  Do we set them all to -O2, then remove it from the ones we
> don't get successful reports on?

I took the time to compile CVS tip with a few different machines from
HP's TestDrive program, to see if there were any regressions using the
new optimization flags:

(1) (my usual dev machine)

$ uname -a
Linux tokyo 2.4.19-xfs #1 Mon Jan 20 19:12:29 EST 2003 i686 GNU/Linux
$ gcc --version
gcc (GCC) 3.3.2 20031005 (Debian prerelease)

'make check' passes

(2)

$ uname -a
Linux spe161 2.4.18-smp #1 SMP Sat Apr 6 21:42:22 EST 2002 alpha unknown
$ gcc --version
gcc (GCC) 3.3.1

'make check' passes

(3)

$ uname -a
Linux spe170 2.4.17-64 #1 Sat Mar 16 17:31:44 MST 2002 parisc64 unknown
$ gcc --version
3.0.4

'make check' passes

BTW, this platform doesn't have any code written for native spinlocks.

(4)

$ uname -a
Linux spe156 2.4.18-mckinley-smp #1 SMP Thu Jul 11 12:51:02 MDT 2002
ia64 unknown
$ gcc --version

When you compile PostgreSQL without changing the CFLAGS configure picks,
the initdb required for 'make check' fails with:

[...]
initializing pg_depend... ok
creating system views... ok
loading pg_description... ok
creating conversions... ERROR:  could not identify operator 679

I tried to compile PostgreSQL with CFLAGS='-O0' to see if the above
resulted from an optimization-induced compiler error, but I got the
following error:

$ gcc -O0 -Wall -Wmissing-prototypes -Wmissing-declarations
-I../../../../src/include -D_GNU_SOURCE   -c -o xlog.o xlog.c
../../../../src/include/storage/s_lock.h: In function `tas':
../../../../src/include/storage/s_lock.h:125: error: inconsistent
operand constraints in an `asm'

Whereas this works fine:

$ gcc -O2 -Wall -Wmissing-prototypes -Wmissing-declarations
-I../../../../src/include -D_GNU_SOURCE   -c -o xlog.o xlog.c
$

BTW, line 138 of s_lock.h is:

#if defined(__arm__) || defined(__arm__)

That seems a little redundant.

Anyway, I tried running initdb after compiling all of pgsql with "-O0',
except for the files that included s_lock.h, but make check still
failed:

creating information schema... ok
vacuuming database template1...
/house/neilc/pgsql/src/test/regress/./tmp_check/install//usr/local/pgsql/bin/initdb: line 882: 22035 Segmentation fault
    (core dumped) "$PGPATH"/postgres $PGSQL_OPT template1 >/dev/null  <<EOF 
ANALYZE;
VACUUM FULL FREEZE;
EOF

The core file seems to indicate a stack overflow due to an infinitely
recursive function:

(gdb) bt 25
#0  0x4000000000645dc0 in hash_search ()
#1  0x4000000000616930 in RelationSysNameCacheGetRelation ()
#2  0x4000000000616db0 in RelationSysNameGetRelation ()
#3  0x4000000000082e40 in relation_openr ()
#4  0x4000000000083910 in heap_openr ()
#5  0x400000000060e6b0 in ScanPgRelation ()
#6  0x4000000000611d60 in RelationBuildDesc ()
#7  0x4000000000616e70 in RelationSysNameGetRelation ()
#8  0x4000000000082e40 in relation_openr ()
#9  0x4000000000083910 in heap_openr ()
#10 0x400000000060e6b0 in ScanPgRelation ()
#11 0x4000000000611d60 in RelationBuildDesc ()
#12 0x4000000000616e70 in RelationSysNameGetRelation ()
#13 0x4000000000082e40 in relation_openr ()
#14 0x4000000000083910 in heap_openr ()
#15 0x400000000060e6b0 in ScanPgRelation ()
#16 0x4000000000611d60 in RelationBuildDesc ()
#17 0x4000000000616e70 in RelationSysNameGetRelation ()
#18 0x4000000000082e40 in relation_openr ()
#19 0x4000000000083910 in heap_openr ()
#20 0x400000000060e6b0 in ScanPgRelation ()
#21 0x4000000000611d60 in RelationBuildDesc ()
#22 0x4000000000616e70 in RelationSysNameGetRelation ()
#23 0x4000000000082e40 in relation_openr ()
#24 0x4000000000083910 in heap_openr ()
(More stack frames follow...)

(It also dumps core in the same place during initdb if CFLAGS='-O' is
specified.)

So it looks like the Itanium port is a little broken. Does anyone have
an idea what needs to be done to fix it?

-Neil