[Bug target/40735] New: [4.3/4.4 regression] memory hog compiling big functions with -fPIE

[Bug target/40735] New: [4.3/4.4 regression] memory hog compiling big functions with -fPIE

[doko at ubuntu dot com]

[forwarded from https://launchpad.net/bugs/398403]

Building the attached file with gcc from the 4.4 branch with -g
-fstack-protector -fPIE -Os, the build fails (killed by oom), last info seen is
memory usage of about 1500mb. Building without -fPIE memory usage is limited
around 700MB.

Same behaviour for 4.3. With gcc-4.2 peak memory usage is with/without -fPIE
below 400MB. Not checked on trunk, currently fails to build.


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           Summary: [4.3/4.4 regression]  memory hog compiling big functions
                    with -fPIE
           Product: gcc
           Version: 4.4.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: doko at ubuntu dot com
GCC target triplet: arm-linux-gnueabi


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40735

[Bug target/40735] [4.3/4.4 regression] memory hog compiling big functions with -fPIE

[doko at ubuntu dot com]

------- Comment #1 from doko at ubuntu dot com  2009-07-13 19:37 -------
Created an attachment (id=18188)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=18188&action=view)
preprocessed source


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40735

[Bug target/40735] [4.3/4.4 regression] memory hog compiling big functions with -fPIE

[rguenth at gcc dot gnu dot org]

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain, Size: 1343 bytes --]



------- Comment #2 from rguenth at gcc dot gnu dot org  2009-07-14 09:20 -------
I cannot compile the attached testcase.

gcc-4.2 -S -o /dev/null -g -fstack-protector -fPIE -Os test_node.i -std=c99
In file included from ../nih/test_alloc.h:32,
                 from ../nih/test.h:36,
                 from tests/test_node.c:23:
../nih/list.h:110: warning: declaration does not declare anything
In file included from tests/test_node.c:40:
./parse.h:71: warning: declaration does not declare anything
tests/test_node.c: In function ‘test_start_tag’:
tests/test_node.c:211: error: ‘ParseStack’ has no member named ‘node’
tests/test_node.c:251: error: ‘ParseStack’ has no member named ‘node’
tests/test_node.c:297: error: ‘ParseStack’ has no member named ‘data’
tests/test_node.c:297: error: ‘ParseStack’ has no member named ‘data’
tests/test_node.c:365: error: ‘ParseStack’ has no member named ‘node’
tests/test_node.c:422: error: ‘ParseStack’ has no member named ‘data’
tests/test_node.c:422: error: ‘ParseStack’ has no member named ‘data’
tests/test_node.c: In function ‘test_object_functions’:
tests/test_node.c:1256: error: ‘NihListEntry’ has no member named ‘str’
tests/test_node.c:1256: error: ‘NihListEntry’ has no member named ‘str’
...


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40735

[Bug target/40735] [4.3/4.4 regression] memory hog compiling big functions with -fPIE

[doko at ubuntu dot com]

------- Comment #3 from doko at ubuntu dot com  2009-07-14 10:31 -------
my bad, should be -std=gnu99 instead: gcc-4.2 -S -o /dev/null -g
-fstack-protector -fPIE -Os test_node.i -std=gnu99


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40735

[Bug target/40735] [4.3/4.4 regression] memory hog compiling big functions with -fPIE

[rguenth at gcc dot gnu dot org]

------- Comment #4 from rguenth at gcc dot gnu dot org  2009-07-14 11:31 -------
This is likely caused by the DF merge.  There are numerous bugs about this
already and nothing really can be done here.

Btw, my numbers are

rguenther@murzim:/tmp> ~/bin/maxmem2.sh gcc-4.4 -S -o /dev/null -g
-fstack-protector -fPIE -Os test_node.i -std=gnu99
total: 744108 kB
rguenther@murzim:/tmp> ~/bin/maxmem2.sh gcc-4.3 -S -o /dev/null -g
-fstack-protector -fPIE -Os test_node.i -std=gnu99
total: 719836 kB
rguenther@murzim:/tmp> ~/bin/maxmem2.sh gcc-4.2 -S -o /dev/null -g
-fstack-protector -fPIE -Os test_node.i -std=gnu99
total: 459757 kB

Thus not 1.5GB but 750MB vs 450MB.

rguenther@murzim:/tmp> ~/bin/maxmem2.sh gcc-4.4 -S -o /dev/null -fPIE -Os
test_node.i -std=gnu99
total: 743380 kB
rguenther@murzim:/tmp> ~/bin/maxmem2.sh gcc-4.4 -S -o /dev/null -Os test_node.i
-std=gnu99
total: 630756 kB

the -fPIE effect itself is even less recognizable.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40735

[Bug target/40735] [4.3/4.4 regression] memory hog compiling big functions with -fPIE

[mikpe at it dot uu dot se]

------- Comment #5 from mikpe at it dot uu dot se  2009-07-14 23:07 -------
Seems heavily target-dependent. With 4.3.4 I see peak usage of 640M for i686,
just under 1.2G for powerpc, and 1.6G for arm.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40735

[Bug target/40735] [4.3/4.4 regression] memory hog compiling big functions with -fPIE

[pinskia at gcc dot gnu dot org]

------- Comment #6 from pinskia at gcc dot gnu dot org  2009-07-14 23:10 -------
Hmm, maybe scheduling is causing it. Does -fno-schedule-insns
-fno-schedule-insns2 cause the memory usage to go down?


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40735

[Bug target/40735] [4.3/4.4 regression] memory hog compiling big functions with -fPIE

[mikpe at it dot uu dot se]

------- Comment #7 from mikpe at it dot uu dot se  2009-07-14 23:33 -------
(In reply to comment #6)
> Hmm, maybe scheduling is causing it. Does -fno-schedule-insns
> -fno-schedule-insns2 cause the memory usage to go down?

Nope, memory usage patterns stayed the same.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40735

[Bug target/40735] [4.3/4.4 regression] memory hog compiling big functions with -fPIE

[steven at gcc dot gnu dot org]

------- Comment #8 from steven at gcc dot gnu dot org  2009-07-15 07:34 -------
Does seem to be a real issue, somewhere.
When trunk builds again, can you please give it a try too?


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steven at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
   Last reconfirmed|0000-00-00 00:00:00         |2009-07-15 07:34:32
               date|                            |
   Target Milestone|---                         |4.3.5


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40735

[Bug target/40735] [4.3/4.4 regression] memory hog compiling big functions with -fPIE

[rguenth at gcc dot gnu dot org]

------- Comment #9 from rguenth at gcc dot gnu dot org  2009-07-15 09:44 -------
DF time on this testcase is already big, and the testcase has lots of function
calls which would explain the difference between targets (DF needs to track all
call-used/clobbered regs).


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40735

[Bug target/40735] [4.3/4.4 regression] memory hog compiling big functions with -fPIE

[mikpe at it dot uu dot se]

------- Comment #10 from mikpe at it dot uu dot se  2009-07-16 18:33 -------
More memory usage numbers on this test case:

With 4.4.1-RC-20090715: i686 peaks at 616M, powerpc at 799M, and arm at 1211M.

With 4.5.0-20090709: i686 peaks at 530M, powerpc at 707M, and arm at 933M.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40735

[Bug target/40735] [4.3/4.4/4.5 Regression] memory hog compiling big functions with -fPIE

[rguenth at gcc dot gnu dot org]

-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |memory-hog
           Priority|P3                          |P2
            Summary|[4.3/4.4 regression]  memory|[4.3/4.4/4.5 Regression]
                   |hog compiling big functions |memory hog compiling big
                   |with -fPIE                  |functions with -fPIE
   Target Milestone|4.3.5                       |4.3.4


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40735

[Bug target/40735] [4.3/4.4/4.5 Regression] memory hog compiling big functions with -fPIE

[rguenth at gcc dot gnu dot org]

------- Comment #11 from rguenth at gcc dot gnu dot org  2009-08-04 12:30 -------
GCC 4.3.4 is being released, adjusting target milestone.


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.3.4                       |4.3.5


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40735

[Bug target/40735] [4.3/4.4/4.5/4.6 Regression] memory hog compiling big functions with -fPIE

[rguenth at gcc dot gnu dot org]

------- Comment #12 from rguenth at gcc dot gnu dot org  2010-05-22 18:13 -------
GCC 4.3.5 is being released, adjusting target milestone.


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.3.5                       |4.3.6


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40735