On 11/24/16 13:13, Vsevolod Stakhov wrote:
On 23/11/2016 16:27, Ed Schouten wrote:
Hi Hans,
2016-11-23 15:27 GMT+01:00 Hans Petter Selasky <h...@selasky.org>:
I've made a patch to hopefully optimise SAT solving in our pkg utility.
Nice! Do you by any chance have any numbers that show the performance
improvements made by this change? Assuming that the SAT solver of
pkg(1) uses an algorithm similar to DPLL[1], a change like this would
affect performance linearly. My guess is therefore that the running
time is reduced by approximately 5/12. Is this correct?
There won't be any improvement if you just remove duplicates from SAT
formula. This situation is handled by picosat internally and even for
naive DPLL there is no significant influence of duplicate KNF clauses:
once you've assumed all vars in some clause, you automatically resolve
all duplicates.
Is there any real improvement of SAT solver speed with this patch? From
my experiences, SAT solving is negligible in terms of CPU time comparing
to other tasks performed by pkg.
Hi,
I added some code to measure the time for SAT solving. During my test
run I'm seeing values in the range 8-10ms for both versions, so I
consider that neglible. However, the unpatched version wants to
reinstall 185 packages while the non-patched version wants to reinstall
1 package. That has a huge time influential. I'm not that familar with
PKG that I can draw any conclusions from this.
# Test1:
echo "n" | /xxx/pkg/src/pkg-static upgrade --no-repo-update > b.txt
# Test2:
echo "n" | env PKG_NO_SORT=YES /xxx/pkg/src/pkg-static upgrade
--no-repo-update > a.txt
Please find the material attached including a debug version patch you
can play with.
--HPS
Checking for upgrades (748 candidates): .......... done
Processing candidates (748 candidates): . done
Skipped 3702 identical rules
Reiterate
SAT solving took 0s and 7370 usecs
The following 52 package(s) will be affected (of 0 checked):
Installed packages to be UPGRADED:
xapian-core: 1.2.23,1 -> 1.2.24,1
webp: 0.5.0 -> 0.5.1_1
webkit2-gtk3: 2.8.5_6 -> 2.8.5_7
webkit-gtk2: 2.4.11_4 -> 2.4.11_5
vlc: 2.2.4_3,4 -> 2.2.4_4,4
trousers: 0.3.13_1 -> 0.3.14
tiff: 4.0.6_2 -> 4.0.7
thunderbird: 45.4.0_2 -> 45.5.0_1
sqlite3: 3.15.1 -> 3.15.1_1
spidermonkey170: 17.0.0_2 -> 17.0.0_3
soundtouch: 1.9.2 -> 1.9.2_1
raptor2: 2.0.15_4 -> 2.0.15_5
qt5-core: 5.6.2 -> 5.6.2_1
qt4-corelib: 4.8.7_5 -> 4.8.7_6
polkit: 0.113_1 -> 0.113_2
pciids: 20161029 -> 20161119
openimageio: 1.6.12_2 -> 1.6.12_3
openblas: 0.2.18_1,1 -> 0.2.18_2,1
openal-soft: 1.17.2 -> 1.17.2_1
libx264: 0.148.2708 -> 0.148.2708_1
libvpx: 1.6.0 -> 1.6.0_1
libvisio01: 0.1.5_3 -> 0.1.5_4
libreoffice: 5.2.3_2 -> 5.2.3_3
libpci: 3.5.1 -> 3.5.2
libmspub01: 0.1.2_4 -> 0.1.2_5
libfreehand: 0.1.1_3 -> 0.1.1_4
libe-book: 0.1.2_5 -> 0.1.2_6
libcdr01: 0.1.3_1 -> 0.1.3_2
lcms2: 2.7_2 -> 2.8
inkscape: 0.91_8 -> 0.91_9
icu: 57.1,1 -> 58.1,1
harfbuzz: 1.3.3 -> 1.3.3_1
gstreamer1-plugins: 1.8.0 -> 1.8.0_1
gstreamer-plugins: 0.10.36_6,3 -> 0.10.36_7,3
gstreamer: 0.10.36_4 -> 0.10.36_5
gnupg: 2.1.15 -> 2.1.16
glib: 2.46.2_3 -> 2.46.2_4
gcc: 4.8.5_2 -> 4.9.4
firefox: 50.0_2,1 -> 50.0_4,1
firebird25-client: 2.5.6_1 -> 2.5.6_2
ffmpeg: 2.8.8_5,1 -> 2.8.8_8,1
dejavu: 2.35 -> 2.37
chromium: 52.0.2743.116_2 -> 52.0.2743.116_4
boost-libs: 1.55.0_13 -> 1.55.0_14
blender: 2.77a -> 2.77a_1
belle-sip: 1.5.0 -> 1.5.0_1
bash: 4.4 -> 4.4.5
argyllcms: 1.7.0_1 -> 1.7.0_2
OpenEXR: 2.2.0_5 -> 2.2.0_6
ImageMagick: 6.9.5.10,1 -> 6.9.5.10_1,1
GraphicsMagick: 1.3.24,1 -> 1.3.24_1,1
Installed packages to be REINSTALLED:
baresip-0.4.19 (options changed)
Number of packages to be upgraded: 51
Number of packages to be reinstalled: 1
The process will require 19 MiB more space.
446 MiB to be downloaded.
Proceed with this action? [y/N]: Checking for upgrades (748 candidates): .......... done
Processing candidates (748 candidates): . done
Reiterate
SAT solving took 0s and 5790 usecs
The following 236 package(s) will be affected (of 0 checked):
Installed packages to be UPGRADED:
xapian-core: 1.2.23,1 -> 1.2.24,1
webp: 0.5.0 -> 0.5.1_1
webkit2-gtk3: 2.8.5_6 -> 2.8.5_7
webkit-gtk2: 2.4.11_4 -> 2.4.11_5
vlc: 2.2.4_3,4 -> 2.2.4_4,4
trousers: 0.3.13_1 -> 0.3.14
tiff: 4.0.6_2 -> 4.0.7
thunderbird: 45.4.0_2 -> 45.5.0_1
sqlite3: 3.15.1 -> 3.15.1_1
spidermonkey170: 17.0.0_2 -> 17.0.0_3
soundtouch: 1.9.2 -> 1.9.2_1
raptor2: 2.0.15_4 -> 2.0.15_5
qt5-core: 5.6.2 -> 5.6.2_1
qt4-corelib: 4.8.7_5 -> 4.8.7_6
polkit: 0.113_1 -> 0.113_2
pciids: 20161029 -> 20161119
openimageio: 1.6.12_2 -> 1.6.12_3
openblas: 0.2.18_1,1 -> 0.2.18_2,1
openal-soft: 1.17.2 -> 1.17.2_1
libx264: 0.148.2708 -> 0.148.2708_1
libvpx: 1.6.0 -> 1.6.0_1
libvisio01: 0.1.5_3 -> 0.1.5_4
libreoffice: 5.2.3_2 -> 5.2.3_3
libpci: 3.5.1 -> 3.5.2
libmspub01: 0.1.2_4 -> 0.1.2_5
libfreehand: 0.1.1_3 -> 0.1.1_4
libe-book: 0.1.2_5 -> 0.1.2_6
libcdr01: 0.1.3_1 -> 0.1.3_2
lcms2: 2.7_2 -> 2.8
inkscape: 0.91_8 -> 0.91_9
icu: 57.1,1 -> 58.1,1
harfbuzz: 1.3.3 -> 1.3.3_1
gstreamer1-plugins: 1.8.0 -> 1.8.0_1
gstreamer-plugins: 0.10.36_6,3 -> 0.10.36_7,3
gstreamer: 0.10.36_4 -> 0.10.36_5
gnupg: 2.1.15 -> 2.1.16
glib: 2.46.2_3 -> 2.46.2_4
gcc: 4.8.5_2 -> 4.9.4
firefox: 50.0_2,1 -> 50.0_4,1
firebird25-client: 2.5.6_1 -> 2.5.6_2
ffmpeg: 2.8.8_5,1 -> 2.8.8_8,1
dejavu: 2.35 -> 2.37
chromium: 52.0.2743.116_2 -> 52.0.2743.116_4
boost-libs: 1.55.0_13 -> 1.55.0_14
blender: 2.77a -> 2.77a_1
belle-sip: 1.5.0 -> 1.5.0_1
bash: 4.4 -> 4.4.5
argyllcms: 1.7.0_1 -> 1.7.0_2
OpenEXR: 2.2.0_5 -> 2.2.0_6
ImageMagick: 6.9.5.10,1 -> 6.9.5.10_1,1
GraphicsMagick: 1.3.24,1 -> 1.3.24_1,1
Installed packages to be REINSTALLED:
yaml-cpp03-0.3.0
yajl-2.1.0
xvid-1.3.4,1
xcb-util-renderutil-0.3.9_1
xcb-util-keysyms-0.4.0_1
xcb-util-0.4.0_1,1
twolame-0.3.13_4
tpm-emulator-0.7.4_1
tinyxml-2.6.2_1
taglib-1.10
startup-notification-0.12_4
speexdsp-1.2.r3_1
speex-1.2.r2,1
speech-dispatcher-0.8.3_1
spandsp-0.0.6
snappy-1.1.3
serf-1.3.9_1
schroedinger-1.0.11_4
redland-1.0.17_4
readline-6.3.8
re2-20151101
rasqal-0.9.33
qt5-x11extras-5.6.2
qt5-widgets-5.6.2
python35-3.5.2
python27-2.7.12
popt-1.16_1
poppler-glib-0.46.0
poppler-0.46.0_2
pixman-0.34.0
perl5-5.24.1.r4
pcre-8.39
pangomm-2.36.0
pango-1.38.0_1
p11-kit-0.23.2
orc-0.4.25
opus-1.1.3
opensubdiv-3.0.5_2
openldap-client-2.4.44
openjpeg15-1.5.2_1
openjpeg-2.1.2_1
opencv2-core-2.4.13.1_1
opencolorio-1.0.9
opencollada-1.6.25
nss-3.27.1_1
nspr-4.13.1
npth-1.2
nettle-3.2
mythes-1.2.4
mpfr-3.1.5
mpc-1.0.3
lua52-5.2.4
libxslt-1.1.29
libxml2-2.9.4
libxcb-1.12
libwps-0.4.4
libwpg03-0.3.1
libwpd010-0.10.1
libwmf-0.2.8.4_15
libvorbis-1.3.5,3
libvdpau-1.1.1
libva-1.7.2
libv4l-1.6.3_2
libtheora-1.1.1_6
libtasn1-4.9
libsoup-2.52.2
libsndfile-1.0.27
libsigc++-2.4.1
libsecret-0.18.4
libsamplerate-0.1.9
librsvg2-2.40.16
librevenge-0.0.4_1
libpthread-stubs-0.3_6
libpciaccess-0.13.4
libpaper-1.1.24.4
libpagemaker-0.0.3
libogg-1.3.2_1,4
libodfgen01-0.1.6
libmwaw03-0.3.8
libmpeg2-0.5.1_6
libmatroska-1.4.5
libmad-0.15.1b_6
libltdl-2.4.6
liblqr-1-0.4.2
libidn-1.33_1
libiconv-1.14_9
libgltf-0.0.2_1
libglapi-11.2.2
libgcrypt-1.7.3
libfpx-1.3.1.4_1
libffi-3.2.1
libexttextcat-3.4.4
libevent2-2.0.22_1
libetonyek01-0.1.6,1
libepoxy-1.3.1
libedit-3.1.20150325_2,1
libdvdread-5.0.3
libdvdnav-5.0.3
libdvbpsi-1.3.0
libdrm-2.4.66,1
libdca-0.0.5_1
libcroco-0.6.11
libcmis-0.5.1
libcddb-1.3.2_4
libassuan-2.4.3
libantlr3c-3.4_1
libabw-0.1.1_1
liba52-0.7.4_3
libXxf86vm-1.1.4_1
libXvMC-1.0.10
libXv-1.0.11,1
libXtst-1.2.3
libXt-1.1.5,1
libXrender-0.9.10
libXrandr-1.5.1
libXmu-1.1.2_3,1
libXinerama-1.1.3_3,1
libXi-1.7.8,1
libXft-2.3.2_1
libXfixes-5.0.3
libXext-1.3.3_1,1
libXdmcp-1.1.2
libXdamage-1.1.4_3
libXcursor-1.1.14_3
libXcomposite-0.4.4_3,1
libXaw-1.0.13,2
libXau-1.0.8_3
libXScrnSaver-1.2.2_3
libX11-1.6.4,1
libSM-1.2.2_3,1
libIDL-0.8.14_2
libICE-1.0.9_1,1
libGLU-9.0.0_2
libGL-11.2.2
libEGL-11.2.2
jpeg-turbo-1.5.1
jbigkit-2.1_1
jasper-1.900.1_16
ilmbase-2.2.0
hyphen-2.8.8
hunspell-1.3.3
gtkspell-2.0.16_5
gtkmm24-2.24.4_2
gtk3-3.18.8_3
gtk2-2.24.29_2
gstreamer1-1.8.0
gsl-1.16_2
gnutls-3.4.16
gmp-5.1.3_3
glibmm-2.44.0,1
glew-1.13.0
giflib-5.1.4
gettext-runtime-0.19.8.1
gdk-pixbuf2-2.32.3_1
gconf2-3.2.6_4
gbm-11.2.2
freetype2-2.6.3
fontconfig-2.12.1,1
flac-1.3.1_2
fftw3-3.3.5
faad2-2.7_6,1
expat-2.2.0
espeak-1.48.04_1
enchant-1.6.0_5
dotconf-1.3_1
dbus-glib-0.104
dbus-1.8.20
db5-5.3.28_6
curl-7.51.0_1
cups-2.2.1
colord-1.2.11_1
clucene-2.3.3.4_7
cairomm-1.10.0_3
cairo-1.14.6_1,2
boehm-gc-7.6.0
bctoolbox-0.2.0
baresip-0.4.19 (options changed)
avahi-app-0.6.31_5
atkmm-2.22.7
atk-2.18.0
at-spi2-atk-2.18.1
apr-1.5.2.1.5.4_2
alsa-lib-1.1.2
ORBit2-2.14.19_1
CoinMP-1.8.3
Number of packages to be upgraded: 51
Number of packages to be reinstalled: 185
The process will require 19 MiB more space.
491 MiB to be downloaded.
Proceed with this action? [y/N]: >From 135812278d74a3dd632713885ba47daa05a2b175 Mon Sep 17 00:00:00 2001
From: Hans Petter Selasky <h...@selasky.org>
Date: Thu, 24 Nov 2016 13:35:37 +0100
Subject: [PATCH] Optimise SAT solving.
Signed-off-by: Hans Petter Selasky <h...@selasky.org>
---
libpkg/pkg_solve.c | 317 ++++++++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 315 insertions(+), 2 deletions(-)
diff --git a/libpkg/pkg_solve.c b/libpkg/pkg_solve.c
index 9cf08e2..d50281f 100644
--- a/libpkg/pkg_solve.c
+++ b/libpkg/pkg_solve.c
@@ -1074,8 +1074,299 @@ pkg_solve_set_initial_assumption(struct pkg_solve_problem *problem,
}
}
-int
-pkg_solve_sat_problem(struct pkg_solve_problem *problem)
+static int
+pkg_solve_item_compare(const void *ppa, const void *ppb)
+{
+ struct pkg_solve_item *ia = *(struct pkg_solve_item **)ppa;
+ struct pkg_solve_item *ib = *(struct pkg_solve_item **)ppb;
+ int va = ia->var->order * ia->inverse;
+ int vb = ib->var->order * ib->inverse;
+
+ if (va > vb)
+ return (1);
+ else if (va < vb)
+ return (-1);
+ return (0);
+}
+
+static int
+pkg_solve_rule_compare(const void *ppa, const void *ppb)
+{
+ struct pkg_solve_rule *ra = *(struct pkg_solve_rule **)ppa;
+ struct pkg_solve_rule *rb = *(struct pkg_solve_rule **)ppb;
+ struct pkg_solve_item *ia;
+ struct pkg_solve_item *ib;
+ size_t na = 0;
+ size_t nb = 0;
+
+ LL_FOREACH(ra->items, ia)
+ na++;
+ LL_FOREACH(rb->items, ib)
+ nb++;
+
+ if (na > nb)
+ return (1);
+ else if (na < nb)
+ return (-1);
+
+ ia = ra->items;
+ ib = rb->items;
+ while (ia != 0 && ib != 0) {
+ int va = ia->var->order * ia->inverse;
+ int vb = ib->var->order * ib->inverse;
+ if (va > vb)
+ return (1);
+ else if (va < vb)
+ return (-1);
+ ia = ia->next;
+ ib = ib->next;
+ }
+ return (0);
+}
+
+static int
+pkg_solve_sat_problem_sub(struct pkg_solve_problem *problem)
+{
+ struct pkg_solve_rule **rule_array;
+ struct pkg_solve_rule *rule;
+ struct pkg_solve_item *item;
+ int res, iter = 0;
+ size_t skipped = 0;
+ size_t i;
+ size_t n;
+ bool need_reiterate = false;
+ const int *failed = NULL;
+ int attempt = 0;
+ struct pkg_solve_variable *var;
+
+ rule_array = (struct pkg_solve_rule **)calloc(kv_size(problem->rules), sizeof(void *));
+ if (rule_array == NULL)
+ return (EPKG_FATAL);
+
+ n = kv_size(problem->rules);
+ for (i = 0; i != n; i++) {
+ size_t j;
+ size_t k;
+
+ rule = kv_A(problem->rules, i);
+ rule_array[i] = rule;
+
+ j = 0;
+ LL_FOREACH(rule->items, item)
+ j++;
+
+ struct pkg_solve_item *item_array[j];
+
+ j = 0;
+ LL_FOREACH(rule->items, item)
+ item_array[j++] = item;
+
+ mergesort(item_array, j, sizeof(void *), pkg_solve_item_compare);
+
+ rule->items = 0;
+ for (k = 0; k != j; k++) {
+ /* if items are identical, skip them */
+ if (k != j - 1 &&
+ pkg_solve_item_compare(item_array + k, item_array + k + 1) == 0) {
+ free(item_array[k]);
+ continue;
+ }
+ item_array[k]->next = rule->items;
+ rule->items = item_array[k];
+ }
+ }
+
+ mergesort(rule_array, n, sizeof(void *), pkg_solve_rule_compare);
+
+ for (i = 0; i != n; i++) {
+ /* if rules are identical, skip them */
+ if (i != n - 1 &&
+ pkg_solve_rule_compare(rule_array + i, rule_array + i + 1) == 0) {
+ skipped++;
+ continue;
+ }
+ rule = rule_array[i];
+ LL_FOREACH(rule->items, item) {
+ picosat_add(problem->sat, item->var->order * item->inverse);
+ }
+
+ picosat_add(problem->sat, 0);
+ pkg_debug_print_rule(rule);
+ }
+
+ for (i = 0; i != n; i++) {
+ /* if rules are identical, skip them */
+ if (i != n - 1 &&
+ pkg_solve_rule_compare(rule_array + i, rule_array + i + 1) == 0)
+ continue;
+ rule = rule_array[i];
+ pkg_solve_set_initial_assumption(problem, rule);
+ }
+
+ free(rule_array);
+
+ pkg_emit_notice("Skipped %lld identical rules", (long long)skipped);
+
+reiterate:
+ pkg_emit_notice("Reiterate");
+
+ res = pkg_solve_picosat_iter(problem, iter);
+
+ if (res != PICOSAT_SATISFIABLE) {
+ /*
+ * in case we cannot satisfy the problem it appears by
+ * experience that the culprit seems to always be the latest of
+ * listed in the failed assumptions.
+ * So try to remove them for the given problem.
+ * To avoid endless loop allow a maximum of 10 iterations no
+ * more
+ */
+ failed = picosat_failed_assumptions(problem->sat);
+ attempt++;
+
+ /* get the last failure */
+ while (*failed) {
+ failed++;
+ }
+ failed--;
+
+ if (attempt >= 10) {
+ pkg_emit_error("Cannot solve problem using SAT solver");
+ UT_string *sb;
+ utstring_new(sb);
+
+ while (*failed) {
+ var = &problem->variables[abs(*failed) - 1];
+ for (i = 0; i < kv_size(problem->rules); i++) {
+ rule = kv_A(problem->rules, i);
+
+ if (rule->reason != PKG_RULE_DEPEND) {
+ LL_FOREACH(rule->items, item) {
+ if (item->var == var) {
+ pkg_print_rule_buf(rule, sb);
+ utstring_printf(sb, "%c", '\n');
+ break;
+ }
+ }
+ }
+ }
+
+ utstring_printf(sb, "cannot %s package %s, remove it from request? ",
+ var->flags & PKG_VAR_INSTALL ? "install" : "remove", var->uid);
+
+ if (pkg_emit_query_yesno(true, utstring_body(sb))) {
+ var->flags |= PKG_VAR_FAILED;
+ }
+
+ failed++;
+ need_reiterate = true;
+ }
+ utstring_clear(sb);
+ } else {
+ pkg_emit_notice("Cannot solve problem using SAT solver, trying another plan");
+ var = &problem->variables[abs(*failed) - 1];
+
+ var->flags |= PKG_VAR_FAILED;
+
+ need_reiterate = true;
+ }
+
+#if 0
+ failed = picosat_next_maximal_satisfiable_subset_of_assumptions(problem->sat);
+
+ while (*failed) {
+ struct pkg_solve_variable *var = &problem->variables[*failed - 1];
+
+ pkg_emit_notice("var: %s", var->uid);
+
+ failed ++;
+ }
+
+ return (EPKG_AGAIN);
+#endif
+ }
+ else {
+
+ /* Assign vars */
+ for (i = 0; i < problem->nvars; i ++) {
+ int val = picosat_deref(problem->sat, i + 1);
+ struct pkg_solve_variable *var = &problem->variables[i];
+
+ if (val > 0)
+ var->flags |= PKG_VAR_INSTALL;
+ else
+ var->flags &= ~PKG_VAR_INSTALL;
+
+ pkg_debug(2, "decided %s %s-%s to %s",
+ var->unit->pkg->type == PKG_INSTALLED ? "local" : "remote",
+ var->uid, var->digest,
+ var->flags & PKG_VAR_INSTALL ? "install" : "delete");
+ }
+
+ /* Check for reiterations */
+ if ((problem->j->type == PKG_JOBS_INSTALL ||
+ problem->j->type == PKG_JOBS_UPGRADE) && iter == 0) {
+ for (i = 0; i < problem->nvars; i ++) {
+ bool failed_var = false;
+ struct pkg_solve_variable *var = &problem->variables[i], *cur;
+
+ if (!(var->flags & PKG_VAR_INSTALL)) {
+ LL_FOREACH(var, cur) {
+ if (cur->flags & PKG_VAR_INSTALL) {
+ failed_var = false;
+ break;
+ }
+ else if (cur->unit->pkg->type == PKG_INSTALLED) {
+ failed_var = true;
+ }
+ }
+ }
+
+ /*
+ * If we want to delete local packages on installation, do one more SAT
+ * iteration to ensure that we have no other choices
+ */
+ if (failed_var) {
+ pkg_debug (1, "trying to delete local package %s-%s on install/upgrade,"
+ " reiterate on SAT",
+ var->unit->pkg->name, var->unit->pkg->version);
+ need_reiterate = true;
+
+ LL_FOREACH(var, cur) {
+ cur->flags |= PKG_VAR_FAILED;
+ }
+ }
+ }
+ }
+ }
+
+ if (need_reiterate) {
+ iter ++;
+
+ /* Restore top-level assumptions */
+ for (i = 0; i < problem->nvars; i ++) {
+ struct pkg_solve_variable *var = &problem->variables[i];
+
+ if (var->flags & PKG_VAR_TOP) {
+ if (var->flags & PKG_VAR_FAILED) {
+ var->flags ^= PKG_VAR_INSTALL | PKG_VAR_FAILED;
+ }
+
+ picosat_assume(problem->sat, var->order *
+ (var->flags & PKG_VAR_INSTALL ? 1 : -1));
+ }
+ }
+
+ need_reiterate = false;
+
+ goto reiterate;
+ }
+
+ return (EPKG_OK);
+}
+
+static int
+pkg_solve_sat_problem_old(struct pkg_solve_problem *problem)
{
struct pkg_solve_rule *rule;
struct pkg_solve_item *item;
@@ -1103,6 +1394,7 @@ pkg_solve_sat_problem(struct pkg_solve_problem *problem)
}
reiterate:
+ pkg_emit_notice("Reiterate");
res = pkg_solve_picosat_iter(problem, iter);
@@ -1259,6 +1551,27 @@ reiterate:
return (EPKG_OK);
}
+int
+pkg_solve_sat_problem(struct pkg_solve_problem *problem)
+{
+ struct timeval tv0;
+ gettimeofday(&tv0, NULL);
+ int err;
+
+ if (getenv("PKG_NO_SORT") != NULL)
+ err = pkg_solve_sat_problem_old(problem);
+ else
+ err = pkg_solve_sat_problem_sub(problem);
+ struct timeval tv1;
+ gettimeofday(&tv1, NULL);
+
+ timersub(&tv1, &tv0, &tv1);
+
+ pkg_emit_notice("SAT solving took %llds and %lld usecs", (long long)tv1.tv_sec, (long long)tv1.tv_usec);
+
+ return (err);
+}
+
void
pkg_solve_dot_export(struct pkg_solve_problem *problem, FILE *file)
{
--
2.10.1
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