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From: Philippe W. <phi...@sk...> - 2010-09-13 20:44:14
|
While implementing a patch to fix quadratic memory usage in m_mallocfree.c (see http://bugs.kde.org/show_bug.cgi?id=250101) I encountered some questions related to the high memory usage by memcheck: First question: memcheck client redzone: ----------------------------------------- Memcheck sets a client redzone (16 bytes IIRC). This is significant for small allocations. What is the purpose of this memcheck client redzone ? (as reading or writing before or after a malloc-ed block will be trapped by the rest of memcheck machinery). Second question: why multiple arenas ? ---------------------------------------- What is the reason to "split" the allocation between client arena and the other (non client) arenas ? When using only one non-client arena, the memory usage by valgrind of a big process decreased of 8%. Has this split "functional" advantages ? Or performance advantages for some cases ? Thanks Philippe Waroquiers |
|
From: Maynard J. <may...@us...> - 2010-09-13 18:02:03
|
On 09/11/2010 5:11 AM, Bart Van Assche wrote: > On Sat, Sep 4, 2010 at 1:49 AM,<sv...@va...> wrote: >> Date: 2010-09-04 00:49:33 +0100 (Sat, 04 Sep 2010) >> New Revision: 11338 >> >> Log: >> Add tests for new PowerISA_2.05 instructions available on Power6 CPUs. >> (Maynard Johnson, may...@us... and Pete Eberlein, ebe...@us...) >> [ ... ] > > automake complains about this change: heh. I was just starting to look at this -- trying a build on a newer version of automake to see if I could reproduce -- and noticed you already fixed it. Thanks! -Maynard > > running: automake -a > configure.in:25: installing `./compile' > configure.in:122: installing `./config.guess' > configure.in:122: installing `./config.sub' > configure.in:14: installing `./install-sh' > configure.in:14: installing `./missing' > Makefile.vex.am: installing `./depcomp' > memcheck/tests/ppc32/Makefile.am:12: AM_CFLAGS multiply defined in > condition TRUE ... > Makefile.tool-tests.am:13: ... `AM_CFLAGS' previously defined here > memcheck/tests/ppc32/Makefile.am:2: `Makefile.tool-tests.am' > included from here > memcheck/tests/ppc32/Makefile.am:13: AM_CXXFLAGS multiply defined in > condition TRUE ... > Makefile.tool-tests.am:14: ... `AM_CXXFLAGS' previously defined here > memcheck/tests/ppc32/Makefile.am:2: `Makefile.tool-tests.am' > included from here > memcheck/tests/ppc64/Makefile.am:12: AM_CFLAGS multiply defined in > condition TRUE ... > Makefile.tool-tests.am:13: ... `AM_CFLAGS' previously defined here > memcheck/tests/ppc64/Makefile.am:2: `Makefile.tool-tests.am' > included from here > memcheck/tests/ppc64/Makefile.am:14: AM_CXXFLAGS multiply defined in > condition TRUE ... > Makefile.tool-tests.am:14: ... `AM_CXXFLAGS' previously defined here > memcheck/tests/ppc64/Makefile.am:2: `Makefile.tool-tests.am' > included from here > > Bart. > > ------------------------------------------------------------------------------ > Start uncovering the many advantages of virtual appliances > and start using them to simplify application deployment and > accelerate your shift to cloud computing > http://p.sf.net/sfu/novell-sfdev2dev > _______________________________________________ > Valgrind-developers mailing list > Val...@li... > https://lists.sourceforge.net/lists/listinfo/valgrind-developers |
|
From: <sv...@va...> - 2010-09-13 17:45:01
|
Author: bart Date: 2010-09-13 18:44:51 +0100 (Mon, 13 Sep 2010) New Revision: 11356 Log: Avoid triggering AM_CFLAGS / AM_CXXFLAGS redefinition warnings. Modified: trunk/memcheck/tests/ppc32/Makefile.am trunk/memcheck/tests/ppc64/Makefile.am Modified: trunk/memcheck/tests/ppc32/Makefile.am =================================================================== --- trunk/memcheck/tests/ppc32/Makefile.am 2010-09-13 17:44:10 UTC (rev 11355) +++ trunk/memcheck/tests/ppc32/Makefile.am 2010-09-13 17:44:51 UTC (rev 11356) @@ -9,5 +9,5 @@ check_PROGRAMS = \ power_ISA2_05 -AM_CFLAGS = $(WERROR) -Winline -Wall -Wshadow -g -I$(top_srcdir)/include @FLAG_M32@ -AM_CXXFLAGS = $(AM_CFLAGS) @FLAG_M32@ +power_ISA2_05_CFLAGS = $(AM_CFLAGS) $(WERROR) -Winline -Wall -Wshadow -g \ + -I$(top_srcdir)/include @FLAG_M32@ Modified: trunk/memcheck/tests/ppc64/Makefile.am =================================================================== --- trunk/memcheck/tests/ppc64/Makefile.am 2010-09-13 17:44:10 UTC (rev 11355) +++ trunk/memcheck/tests/ppc64/Makefile.am 2010-09-13 17:44:51 UTC (rev 11356) @@ -9,6 +9,5 @@ check_PROGRAMS = \ power_ISA2_05 -AM_CFLAGS = $(WERROR) -Winline -Wall -Wshadow -g -I$(top_srcdir)/include \ - @FLAG_M64@ -AM_CXXFLAGS = $(AM_CFLAGS) @FLAG_M64@ +power_ISA2_05_CFLAGS = $(AM_CFLAGS) $(WERROR) -Winline -Wall -Wshadow -g \ + -I$(top_srcdir)/include @FLAG_M64@ |
|
From: <sv...@va...> - 2010-09-13 17:44:22
|
Author: bart
Date: 2010-09-13 18:44:10 +0100 (Mon, 13 Sep 2010)
New Revision: 11355
Log:
Restored original code for other compilers than ppc gcc 4.3.0 such that at least one test invokes ANNOTATE_UNPROTECTED_READ().
Modified:
trunk/drd/tests/annotate_static.cpp
Modified: trunk/drd/tests/annotate_static.cpp
===================================================================
--- trunk/drd/tests/annotate_static.cpp 2010-09-11 10:07:56 UTC (rev 11354)
+++ trunk/drd/tests/annotate_static.cpp 2010-09-13 17:44:10 UTC (rev 11355)
@@ -21,10 +21,15 @@
static void* thread_func(void*)
{
+#if defined(__powerpc__) && __GNUC__ -0 == 4 && __GNUC_MINOR__ -0 == 3 \
+ && __GNUC_PATCHLEVEL__ -0 == 0
AnnotateIgnoreReadsBegin();
int i = s_j;
AnnotateIgnoreReadsEnd();
s_i = i;
+#else
+ s_i = ANNOTATE_UNPROTECTED_READ(s_j);
+#endif
return 0;
}
|