Use libxxhash for hashing, if present
XXHash is faster than htab_hash_string: ------------------------------------------------------------ Benchmark Time CPU Iterations ------------------------------------------------------------ BM_xxh3 11 ns 11 ns 65887249 BM_xxh32 19 ns 19 ns 36511877 BM_xxh64 16 ns 16 ns 42964585 BM_hash_string 182 ns 182 ns 3853125 BM_iterative_hash 77 ns 77 ns 9087638 Unfortunately, XXH3 is still experimental (see https://github.com/Cyan4973/xxHash#user-content-new-experimental-hash-algorithm) However, regular XXH64 is still a lot faster than htab_hash_string per my benchmark above. I used the following string for the benchmark: static constexpr char str[] = "_ZZZL13make_gdb_typeP7gdbarchP10tdesc_typeEN16gdb_type_creator19make_gdb_type_flagsEPK22tdesc_type_with_fieldsE19__PRETTY_FUNCTION__"; htab_hash_string is currently 4.35% + 7.98% (rehashing) of gdb startup when attaching to Chrome's content_shell. An additional 5.21% is spent in msymbol_hash, which does not use this hash function. Unfortunately, since it has to lowercase the string, it can't use this hash function. BM_msymbol_hash 52 ns 52 ns 13281495 It may be worth investigating if strlen+XXHash is still faster than htab_hash_string, which would make it easier to use in more places. Debian ships xxhash as libxxhash{0,-dev}. Fedora ships it as xxhash-devel. gdb/ChangeLog: 2019-10-22 Christian Biesinger <cbiesinger@google.com> * Makefile.in: Link with libxxhash. * config.in: Regenerate. * configure: Regenerate. * configure.ac: Search for libxxhash. * utils.c (fast_hash): Use xxhash if present. Change-Id: Icab218388b9f829522ed3977f04301ae6d4fc4ca
This commit is contained in:
Christian Biesinger
parent
1a6ff1a96b
commit
ccb1ba6229
@ -1,3 +1,11 @@
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2019-10-22 Christian Biesinger <cbiesinger@google.com>
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* Makefile.in: Link with libxxhash.
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* config.in: Regenerate.
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* configure: Regenerate.
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* configure.ac: Search for libxxhash.
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* utils.c (fast_hash): Use xxhash if present.
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2019-10-22 Christian Biesinger <cbiesinger@google.com>
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* utils.h (fast_hash): New function.
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@ -187,10 +187,14 @@ LIBEXPAT = @LIBEXPAT@
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# Where is lzma? This will be empty if lzma was not available.
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LIBLZMA = @LIBLZMA@
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# Where is libbabeltrace? This will be empty if lbabeltrace was not
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# Where is libbabeltrace? This will be empty if libbabeltrace was not
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# available.
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LIBBABELTRACE = @LIBBABELTRACE@
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# Where is libxxhash? This will be empty if libxxhash was not
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# available.
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LIBXXHASH = @LIBXXHASH@
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# Where is libipt? This will be empty if libipt was not available.
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LIBIPT = @LIBIPT@
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@ -597,7 +601,7 @@ CLIBS = $(SIM) $(READLINE) $(OPCODES) $(BFD) $(LIBCTF) $(ZLIB) \
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@LIBS@ @GUILE_LIBS@ @PYTHON_LIBS@ \
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$(LIBEXPAT) $(LIBLZMA) $(LIBBABELTRACE) $(LIBIPT) \
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$(LIBIBERTY) $(WIN32LIBS) $(LIBGNU) $(LIBICONV) $(LIBMPFR) \
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$(SRCHIGH_LIBS)
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$(SRCHIGH_LIBS) $(LIBXXHASH)
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CDEPS = $(NAT_CDEPS) $(SIM) $(BFD) $(READLINE_DEPS) $(LIBCTF) \
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$(OPCODES) $(INTL_DEPS) $(LIBIBERTY) $(CONFIG_DEPS) $(LIBGNU)
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@ -255,6 +255,9 @@
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/* Define to 1 if you have the <libunwind-ia64.h> header file. */
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#undef HAVE_LIBUNWIND_IA64_H
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/* Define if you have the xxhash library. */
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#undef HAVE_LIBXXHASH
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/* Define to 1 if you have the <linux/elf.h> header file. */
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#undef HAVE_LINUX_ELF_H
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497
gdb/configure
vendored
497
gdb/configure
vendored
@ -628,6 +628,9 @@ GDB_TRANSFORM_NAME
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XSLTPROC
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NM_H
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GDB_NM_FILE
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LTLIBXXHASH
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LIBXXHASH
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HAVE_LIBXXHASH
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LTLIBBABELTRACE
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LIBBABELTRACE
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HAVE_LIBBABELTRACE
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@ -898,6 +901,8 @@ enable_sim
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enable_gdbserver
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with_babeltrace
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with_libbabeltrace_prefix
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with_xxhash
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with_libxxhash_prefix
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enable_unit_tests
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'
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ac_precious_vars='build_alias
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@ -1628,6 +1633,9 @@ Optional Packages:
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--with-babeltrace include babeltrace support (auto/yes/no)
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--with-libbabeltrace-prefix[=DIR] search for libbabeltrace in DIR/include and DIR/lib
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--without-libbabeltrace-prefix don't search for libbabeltrace in includedir and libdir
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--with-xxhash use libxxhash for hashing (faster) (auto/yes/no)
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--with-libxxhash-prefix[=DIR] search for libxxhash in DIR/include and DIR/lib
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--without-libxxhash-prefix don't search for libxxhash in includedir and libdir
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Some influential environment variables:
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CC C compiler command
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@ -17557,6 +17565,495 @@ $as_echo "$as_me: WARNING: babeltrace is missing or unusable; GDB is unable to r
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fi
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fi
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# Check for xxhash
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# Check whether --with-xxhash was given.
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if test "${with_xxhash+set}" = set; then :
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withval=$with_xxhash;
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else
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with_xxhash=auto
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fi
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if test "x$with_xxhash" != "xno"; then
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use_additional=yes
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acl_save_prefix="$prefix"
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prefix="$acl_final_prefix"
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acl_save_exec_prefix="$exec_prefix"
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exec_prefix="$acl_final_exec_prefix"
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eval additional_includedir=\"$includedir\"
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eval additional_libdir=\"$libdir\"
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exec_prefix="$acl_save_exec_prefix"
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prefix="$acl_save_prefix"
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# Check whether --with-libxxhash-prefix was given.
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if test "${with_libxxhash_prefix+set}" = set; then :
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withval=$with_libxxhash_prefix;
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if test "X$withval" = "Xno"; then
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use_additional=no
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else
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if test "X$withval" = "X"; then
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acl_save_prefix="$prefix"
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prefix="$acl_final_prefix"
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acl_save_exec_prefix="$exec_prefix"
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exec_prefix="$acl_final_exec_prefix"
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eval additional_includedir=\"$includedir\"
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eval additional_libdir=\"$libdir\"
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exec_prefix="$acl_save_exec_prefix"
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prefix="$acl_save_prefix"
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else
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additional_includedir="$withval/include"
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additional_libdir="$withval/lib"
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fi
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fi
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fi
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LIBXXHASH=
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LTLIBXXHASH=
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INCXXHASH=
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rpathdirs=
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ltrpathdirs=
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names_already_handled=
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names_next_round='xxhash '
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while test -n "$names_next_round"; do
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names_this_round="$names_next_round"
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names_next_round=
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for name in $names_this_round; do
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already_handled=
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for n in $names_already_handled; do
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if test "$n" = "$name"; then
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already_handled=yes
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break
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fi
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done
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if test -z "$already_handled"; then
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names_already_handled="$names_already_handled $name"
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uppername=`echo "$name" | sed -e 'y|abcdefghijklmnopqrstuvwxyz./-|ABCDEFGHIJKLMNOPQRSTUVWXYZ___|'`
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eval value=\"\$HAVE_LIB$uppername\"
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if test -n "$value"; then
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if test "$value" = yes; then
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eval value=\"\$LIB$uppername\"
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test -z "$value" || LIBXXHASH="${LIBXXHASH}${LIBXXHASH:+ }$value"
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eval value=\"\$LTLIB$uppername\"
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test -z "$value" || LTLIBXXHASH="${LTLIBXXHASH}${LTLIBXXHASH:+ }$value"
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else
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:
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fi
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else
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found_dir=
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found_la=
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found_so=
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found_a=
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if test $use_additional = yes; then
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if test -n "$shlibext" && test -f "$additional_libdir/lib$name.$shlibext"; then
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found_dir="$additional_libdir"
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found_so="$additional_libdir/lib$name.$shlibext"
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if test -f "$additional_libdir/lib$name.la"; then
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found_la="$additional_libdir/lib$name.la"
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fi
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else
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if test -f "$additional_libdir/lib$name.$libext"; then
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found_dir="$additional_libdir"
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found_a="$additional_libdir/lib$name.$libext"
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if test -f "$additional_libdir/lib$name.la"; then
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found_la="$additional_libdir/lib$name.la"
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fi
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fi
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fi
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fi
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if test "X$found_dir" = "X"; then
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for x in $LDFLAGS $LTLIBXXHASH; do
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acl_save_prefix="$prefix"
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prefix="$acl_final_prefix"
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acl_save_exec_prefix="$exec_prefix"
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exec_prefix="$acl_final_exec_prefix"
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eval x=\"$x\"
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exec_prefix="$acl_save_exec_prefix"
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prefix="$acl_save_prefix"
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case "$x" in
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-L*)
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dir=`echo "X$x" | sed -e 's/^X-L//'`
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if test -n "$shlibext" && test -f "$dir/lib$name.$shlibext"; then
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found_dir="$dir"
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found_so="$dir/lib$name.$shlibext"
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if test -f "$dir/lib$name.la"; then
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found_la="$dir/lib$name.la"
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fi
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else
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if test -f "$dir/lib$name.$libext"; then
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found_dir="$dir"
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found_a="$dir/lib$name.$libext"
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if test -f "$dir/lib$name.la"; then
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found_la="$dir/lib$name.la"
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fi
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fi
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fi
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;;
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esac
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if test "X$found_dir" != "X"; then
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break
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fi
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done
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fi
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if test "X$found_dir" != "X"; then
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LTLIBXXHASH="${LTLIBXXHASH}${LTLIBXXHASH:+ }-L$found_dir -l$name"
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if test "X$found_so" != "X"; then
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if test "$enable_rpath" = no || test "X$found_dir" = "X/usr/lib"; then
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LIBXXHASH="${LIBXXHASH}${LIBXXHASH:+ }$found_so"
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else
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haveit=
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for x in $ltrpathdirs; do
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if test "X$x" = "X$found_dir"; then
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haveit=yes
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break
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fi
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done
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if test -z "$haveit"; then
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ltrpathdirs="$ltrpathdirs $found_dir"
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fi
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if test "$hardcode_direct" = yes; then
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LIBXXHASH="${LIBXXHASH}${LIBXXHASH:+ }$found_so"
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else
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if test -n "$hardcode_libdir_flag_spec" && test "$hardcode_minus_L" = no; then
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LIBXXHASH="${LIBXXHASH}${LIBXXHASH:+ }$found_so"
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haveit=
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for x in $rpathdirs; do
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if test "X$x" = "X$found_dir"; then
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haveit=yes
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break
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fi
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done
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if test -z "$haveit"; then
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rpathdirs="$rpathdirs $found_dir"
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fi
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else
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haveit=
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for x in $LDFLAGS $LIBXXHASH; do
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acl_save_prefix="$prefix"
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prefix="$acl_final_prefix"
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acl_save_exec_prefix="$exec_prefix"
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exec_prefix="$acl_final_exec_prefix"
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eval x=\"$x\"
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exec_prefix="$acl_save_exec_prefix"
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prefix="$acl_save_prefix"
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if test "X$x" = "X-L$found_dir"; then
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haveit=yes
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break
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fi
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done
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if test -z "$haveit"; then
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LIBXXHASH="${LIBXXHASH}${LIBXXHASH:+ }-L$found_dir"
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fi
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if test "$hardcode_minus_L" != no; then
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LIBXXHASH="${LIBXXHASH}${LIBXXHASH:+ }$found_so"
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else
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LIBXXHASH="${LIBXXHASH}${LIBXXHASH:+ }-l$name"
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fi
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fi
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fi
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fi
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else
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if test "X$found_a" != "X"; then
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LIBXXHASH="${LIBXXHASH}${LIBXXHASH:+ }$found_a"
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else
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LIBXXHASH="${LIBXXHASH}${LIBXXHASH:+ }-L$found_dir -l$name"
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fi
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fi
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additional_includedir=
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case "$found_dir" in
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*/lib | */lib/)
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basedir=`echo "X$found_dir" | sed -e 's,^X,,' -e 's,/lib/*$,,'`
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additional_includedir="$basedir/include"
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;;
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esac
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if test "X$additional_includedir" != "X"; then
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if test "X$additional_includedir" != "X/usr/include"; then
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haveit=
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if test "X$additional_includedir" = "X/usr/local/include"; then
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if test -n "$GCC"; then
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case $host_os in
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linux*) haveit=yes;;
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esac
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fi
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fi
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if test -z "$haveit"; then
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for x in $CPPFLAGS $INCXXHASH; do
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acl_save_prefix="$prefix"
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prefix="$acl_final_prefix"
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acl_save_exec_prefix="$exec_prefix"
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exec_prefix="$acl_final_exec_prefix"
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eval x=\"$x\"
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exec_prefix="$acl_save_exec_prefix"
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prefix="$acl_save_prefix"
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if test "X$x" = "X-I$additional_includedir"; then
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haveit=yes
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break
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fi
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done
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if test -z "$haveit"; then
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if test -d "$additional_includedir"; then
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INCXXHASH="${INCXXHASH}${INCXXHASH:+ }-I$additional_includedir"
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fi
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fi
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fi
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fi
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fi
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if test -n "$found_la"; then
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save_libdir="$libdir"
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case "$found_la" in
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*/* | *\\*) . "$found_la" ;;
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*) . "./$found_la" ;;
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esac
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libdir="$save_libdir"
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for dep in $dependency_libs; do
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case "$dep" in
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-L*)
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additional_libdir=`echo "X$dep" | sed -e 's/^X-L//'`
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if test "X$additional_libdir" != "X/usr/lib"; then
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haveit=
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if test "X$additional_libdir" = "X/usr/local/lib"; then
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if test -n "$GCC"; then
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case $host_os in
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linux*) haveit=yes;;
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esac
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fi
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fi
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if test -z "$haveit"; then
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haveit=
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for x in $LDFLAGS $LIBXXHASH; do
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acl_save_prefix="$prefix"
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prefix="$acl_final_prefix"
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acl_save_exec_prefix="$exec_prefix"
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exec_prefix="$acl_final_exec_prefix"
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eval x=\"$x\"
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exec_prefix="$acl_save_exec_prefix"
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prefix="$acl_save_prefix"
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if test "X$x" = "X-L$additional_libdir"; then
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haveit=yes
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break
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fi
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done
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if test -z "$haveit"; then
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if test -d "$additional_libdir"; then
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LIBXXHASH="${LIBXXHASH}${LIBXXHASH:+ }-L$additional_libdir"
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fi
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fi
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haveit=
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for x in $LDFLAGS $LTLIBXXHASH; do
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acl_save_prefix="$prefix"
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prefix="$acl_final_prefix"
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acl_save_exec_prefix="$exec_prefix"
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exec_prefix="$acl_final_exec_prefix"
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eval x=\"$x\"
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exec_prefix="$acl_save_exec_prefix"
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prefix="$acl_save_prefix"
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if test "X$x" = "X-L$additional_libdir"; then
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haveit=yes
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break
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fi
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done
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if test -z "$haveit"; then
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if test -d "$additional_libdir"; then
|
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LTLIBXXHASH="${LTLIBXXHASH}${LTLIBXXHASH:+ }-L$additional_libdir"
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fi
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fi
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fi
|
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fi
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;;
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-R*)
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dir=`echo "X$dep" | sed -e 's/^X-R//'`
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if test "$enable_rpath" != no; then
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haveit=
|
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for x in $rpathdirs; do
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if test "X$x" = "X$dir"; then
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haveit=yes
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break
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fi
|
||||
done
|
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if test -z "$haveit"; then
|
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rpathdirs="$rpathdirs $dir"
|
||||
fi
|
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haveit=
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for x in $ltrpathdirs; do
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if test "X$x" = "X$dir"; then
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haveit=yes
|
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break
|
||||
fi
|
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done
|
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if test -z "$haveit"; then
|
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ltrpathdirs="$ltrpathdirs $dir"
|
||||
fi
|
||||
fi
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;;
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-l*)
|
||||
names_next_round="$names_next_round "`echo "X$dep" | sed -e 's/^X-l//'`
|
||||
;;
|
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*.la)
|
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names_next_round="$names_next_round "`echo "X$dep" | sed -e 's,^X.*/,,' -e 's,^lib,,' -e 's,\.la$,,'`
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;;
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*)
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LIBXXHASH="${LIBXXHASH}${LIBXXHASH:+ }$dep"
|
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LTLIBXXHASH="${LTLIBXXHASH}${LTLIBXXHASH:+ }$dep"
|
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;;
|
||||
esac
|
||||
done
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fi
|
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else
|
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LIBXXHASH="${LIBXXHASH}${LIBXXHASH:+ }-l$name"
|
||||
LTLIBXXHASH="${LTLIBXXHASH}${LTLIBXXHASH:+ }-l$name"
|
||||
fi
|
||||
fi
|
||||
fi
|
||||
done
|
||||
done
|
||||
if test "X$rpathdirs" != "X"; then
|
||||
if test -n "$hardcode_libdir_separator"; then
|
||||
alldirs=
|
||||
for found_dir in $rpathdirs; do
|
||||
alldirs="${alldirs}${alldirs:+$hardcode_libdir_separator}$found_dir"
|
||||
done
|
||||
acl_save_libdir="$libdir"
|
||||
libdir="$alldirs"
|
||||
eval flag=\"$hardcode_libdir_flag_spec\"
|
||||
libdir="$acl_save_libdir"
|
||||
LIBXXHASH="${LIBXXHASH}${LIBXXHASH:+ }$flag"
|
||||
else
|
||||
for found_dir in $rpathdirs; do
|
||||
acl_save_libdir="$libdir"
|
||||
libdir="$found_dir"
|
||||
eval flag=\"$hardcode_libdir_flag_spec\"
|
||||
libdir="$acl_save_libdir"
|
||||
LIBXXHASH="${LIBXXHASH}${LIBXXHASH:+ }$flag"
|
||||
done
|
||||
fi
|
||||
fi
|
||||
if test "X$ltrpathdirs" != "X"; then
|
||||
for found_dir in $ltrpathdirs; do
|
||||
LTLIBXXHASH="${LTLIBXXHASH}${LTLIBXXHASH:+ }-R$found_dir"
|
||||
done
|
||||
fi
|
||||
|
||||
|
||||
ac_save_CPPFLAGS="$CPPFLAGS"
|
||||
|
||||
for element in $INCXXHASH; do
|
||||
haveit=
|
||||
for x in $CPPFLAGS; do
|
||||
|
||||
acl_save_prefix="$prefix"
|
||||
prefix="$acl_final_prefix"
|
||||
acl_save_exec_prefix="$exec_prefix"
|
||||
exec_prefix="$acl_final_exec_prefix"
|
||||
eval x=\"$x\"
|
||||
exec_prefix="$acl_save_exec_prefix"
|
||||
prefix="$acl_save_prefix"
|
||||
|
||||
if test "X$x" = "X$element"; then
|
||||
haveit=yes
|
||||
break
|
||||
fi
|
||||
done
|
||||
if test -z "$haveit"; then
|
||||
CPPFLAGS="${CPPFLAGS}${CPPFLAGS:+ }$element"
|
||||
fi
|
||||
done
|
||||
|
||||
|
||||
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for libxxhash" >&5
|
||||
$as_echo_n "checking for libxxhash... " >&6; }
|
||||
if ${ac_cv_libxxhash+:} false; then :
|
||||
$as_echo_n "(cached) " >&6
|
||||
else
|
||||
|
||||
ac_save_LIBS="$LIBS"
|
||||
LIBS="$LIBS $LIBXXHASH"
|
||||
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
|
||||
/* end confdefs.h. */
|
||||
#include <xxhash.h>
|
||||
int
|
||||
main ()
|
||||
{
|
||||
XXH32("foo", 3, 0);
|
||||
|
||||
;
|
||||
return 0;
|
||||
}
|
||||
_ACEOF
|
||||
if ac_fn_c_try_link "$LINENO"; then :
|
||||
ac_cv_libxxhash=yes
|
||||
else
|
||||
ac_cv_libxxhash=no
|
||||
fi
|
||||
rm -f core conftest.err conftest.$ac_objext \
|
||||
conftest$ac_exeext conftest.$ac_ext
|
||||
LIBS="$ac_save_LIBS"
|
||||
|
||||
fi
|
||||
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_libxxhash" >&5
|
||||
$as_echo "$ac_cv_libxxhash" >&6; }
|
||||
if test "$ac_cv_libxxhash" = yes; then
|
||||
HAVE_LIBXXHASH=yes
|
||||
|
||||
$as_echo "#define HAVE_LIBXXHASH 1" >>confdefs.h
|
||||
|
||||
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking how to link with libxxhash" >&5
|
||||
$as_echo_n "checking how to link with libxxhash... " >&6; }
|
||||
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $LIBXXHASH" >&5
|
||||
$as_echo "$LIBXXHASH" >&6; }
|
||||
else
|
||||
HAVE_LIBXXHASH=no
|
||||
CPPFLAGS="$ac_save_CPPFLAGS"
|
||||
LIBXXHASH=
|
||||
LTLIBXXHASH=
|
||||
fi
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
if test "$HAVE_LIBXXHASH" != yes; then
|
||||
if test "$with_xxhash" = yes; then
|
||||
as_fn_error $? "xxhash is missing or unusable" "$LINENO" 5
|
||||
fi
|
||||
fi
|
||||
if test "x$with_xxhash" = "xauto"; then
|
||||
with_xxhash="$HAVE_LIBXXHASH"
|
||||
fi
|
||||
fi
|
||||
|
||||
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether to use xxhash" >&5
|
||||
$as_echo_n "checking whether to use xxhash... " >&6; }
|
||||
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $with_xxhash" >&5
|
||||
$as_echo "$with_xxhash" >&6; }
|
||||
|
||||
NM_H=
|
||||
rm -f nm.h
|
||||
if test "${nativefile}" != ""; then
|
||||
|
||||
@ -2217,6 +2217,29 @@ else
|
||||
fi
|
||||
fi
|
||||
|
||||
# Check for xxhash
|
||||
AC_ARG_WITH(xxhash,
|
||||
AC_HELP_STRING([--with-xxhash], [use libxxhash for hashing (faster) (auto/yes/no)]),
|
||||
[], [with_xxhash=auto])
|
||||
|
||||
if test "x$with_xxhash" != "xno"; then
|
||||
AC_LIB_HAVE_LINKFLAGS([xxhash], [],
|
||||
[#include <xxhash.h>],
|
||||
[XXH32("foo", 3, 0);
|
||||
])
|
||||
if test "$HAVE_LIBXXHASH" != yes; then
|
||||
if test "$with_xxhash" = yes; then
|
||||
AC_MSG_ERROR([xxhash is missing or unusable])
|
||||
fi
|
||||
fi
|
||||
if test "x$with_xxhash" = "xauto"; then
|
||||
with_xxhash="$HAVE_LIBXXHASH"
|
||||
fi
|
||||
fi
|
||||
|
||||
AC_MSG_CHECKING([whether to use xxhash])
|
||||
AC_MSG_RESULT([$with_xxhash])
|
||||
|
||||
NM_H=
|
||||
rm -f nm.h
|
||||
if test "${nativefile}" != ""; then
|
||||
|
||||
@ -36,6 +36,10 @@
|
||||
#include <pc.h>
|
||||
#endif
|
||||
|
||||
#ifdef HAVE_LIBXXHASH
|
||||
#include <xxhash.h>
|
||||
#endif
|
||||
|
||||
#include <signal.h>
|
||||
#include "gdbcmd.h"
|
||||
#include "serial.h"
|
||||
|
||||
@ -574,7 +574,11 @@ extern void copy_bitwise (gdb_byte *dest, ULONGEST dest_offset,
|
||||
static inline unsigned int
|
||||
fast_hash (const char* str, size_t len)
|
||||
{
|
||||
#ifdef HAVE_LIBXXHASH
|
||||
return XXH64 (str, len, 0);
|
||||
#else
|
||||
return iterative_hash (str, len, 0);
|
||||
#endif
|
||||
}
|
||||
|
||||
#endif /* UTILS_H */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user