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solver: remove minimum penalty logic 

Reasoning:
- it is less useful now that we do not do common dependency merging
- provides support would make the required logic overly complicated
- callgrind reports that depending on the case it can improve or
  decrease performance (the overhead pays off only in some cases);
  the difference is not large either way
cute-signatures
Timo Teräs 2012-02-27 08:29:35 +02:00
parent 12bdec38a3
commit f0f2029eb1
1 changed files with 7 additions and 49 deletions
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56
src/solver.c
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@ -100,7 +100,6 @@ struct apk_name_state {
struct apk_name *name;
struct apk_provider chosen;
struct apk_score minimum_penalty;
unsigned short requirers;
unsigned short install_ifs;
@ -146,7 +145,6 @@ struct apk_solver_state {
struct apk_solution_array *best_solution;
struct apk_score score;
struct apk_score minimum_penalty;
struct apk_score best_score;
unsigned solver_flags : 4;
@ -655,8 +653,6 @@ static void demote_name(struct apk_solver_state *ss, struct apk_name *name)
return;
/* remove cached information */
subscore(&ss->minimum_penalty, &ns->minimum_penalty);
ns->minimum_penalty = (struct apk_score) { .score = 0 };
ns->chosen = CHOSEN_NONE;
/* and remove list, or request refresh */
@ -811,24 +807,9 @@ static solver_result_t apply_decision(struct apk_solver_state *ss,
}
if (d->type == DECISION_ASSIGN) {
subscore(&ss->minimum_penalty, &ns->minimum_penalty);
ns->minimum_penalty = (struct apk_score) { .score = 0 };
get_topology_score(ss, ns, pkg, &score);
addscore(&ss->score, &score);
if (cmpscore2(&ss->score, &ss->minimum_penalty, &ss->best_score) >= 0) {
dbg_printf("install causing "SCORE_FMT", penalty too big: "SCORE_FMT"+"SCORE_FMT">="SCORE_FMT"\n",
SCORE_PRINTF(&score),
SCORE_PRINTF(&ss->score),
SCORE_PRINTF(&ss->minimum_penalty),
SCORE_PRINTF(&ss->best_score));
subscore(&ss->score, &score);
return SOLVERR_PRUNED;
}
ss->assigned_names++;
assign_name(ss, name, APK_PROVIDER_FROM_PACKAGE(pkg));
for (i = 0; i < pkg->provides->num; i++) {
@ -845,9 +826,6 @@ static solver_result_t apply_decision(struct apk_solver_state *ss,
(d->type == DECISION_ASSIGN) ? "ASSIGN" : "EXCLUDE");
if (d->type == DECISION_ASSIGN) {
subscore(&ss->minimum_penalty, &ns->minimum_penalty);
ns->minimum_penalty = (struct apk_score) { .score = 0 };
get_unassigned_score(name, &score);
addscore(&ss->score, &score);
@ -860,12 +838,11 @@ static solver_result_t apply_decision(struct apk_solver_state *ss,
}
}
if (cmpscore2(&ss->score, &ss->minimum_penalty, &ss->best_score) >= 0) {
dbg_printf("%s: %s penalty too big: "SCORE_FMT"+"SCORE_FMT">="SCORE_FMT"\n",
if (cmpscore(&ss->score, &ss->best_score) >= 0) {
dbg_printf("%s: %s penalty too big: "SCORE_FMT">="SCORE_FMT"\n",
name->name,
(d->type == DECISION_ASSIGN) ? "ASSIGN" : "EXCLUDE",
SCORE_PRINTF(&ss->score),
SCORE_PRINTF(&ss->minimum_penalty),
SCORE_PRINTF(&ss->best_score));
return SOLVERR_PRUNED;
}
@ -1146,20 +1123,14 @@ static void undo_constraint(struct apk_solver_state *ss, struct apk_dependency *
static int reconsider_name(struct apk_solver_state *ss, struct apk_name *name)
{
struct apk_name_state *ns = name_to_ns(name);
struct apk_score minscore, score;
struct apk_provider *next_p = NULL;
unsigned int next_topology = 0, options = 0;
int i, score_locked = FALSE;
subscore(&ss->minimum_penalty, &ns->minimum_penalty);
ns->minimum_penalty = (struct apk_score) { .score = 0 };
score = ss->score;
addscore(&score, &ss->minimum_penalty);
if (!ns->none_excluded) {
struct apk_score minscore;
get_unassigned_score(name, &minscore);
if (cmpscore2(&score, &minscore, &ss->best_score) >= 0) {
if (cmpscore2(&ss->score, &minscore, &ss->best_score) >= 0) {
dbg_printf("%s: pruning none, score too high "SCORE_FMT"+"SCORE_FMT">="SCORE_FMT"\n",
name->name,
SCORE_PRINTF(&score),
@ -1167,8 +1138,6 @@ static int reconsider_name(struct apk_solver_state *ss, struct apk_name *name)
SCORE_PRINTF(&ss->best_score));
return push_decision(ss, name, NULL, DECISION_EXCLUDE, BRANCH_NO, FALSE);
}
} else {
minscore.score = -1;
}
for (i = 0; i < name->providers->num; i++) {
@ -1185,13 +1154,9 @@ static int reconsider_name(struct apk_solver_state *ss, struct apk_name *name)
score_locked = get_topology_score(ss, ns, pkg0, &pkg0_score);
/* viable alternative? */
if (cmpscore2(&score, &pkg0_score, &ss->best_score) >= 0)
if (cmpscore2(&ss->score, &pkg0_score, &ss->best_score) >= 0)
return push_decision(ss, name, pkg0, DECISION_EXCLUDE, BRANCH_NO, FALSE);
/* find the minimum penalty */
if (cmpscore(&pkg0_score, &minscore) < 0)
minscore = pkg0_score;
/* next in topology order - next to get locked in */
if (ps0->topology_soft < ss->topology_position &&
ps0->topology_soft > next_topology)
@ -1216,8 +1181,6 @@ static int reconsider_name(struct apk_solver_state *ss, struct apk_name *name)
}
ns->chosen = *next_p;
ns->minimum_penalty = minscore;
addscore(&ss->minimum_penalty, &ns->minimum_penalty);
dbg_printf("reconsider_name: %s: min penalty " SCORE_FMT ", next_pkg=%p\n",
name->name, SCORE_PRINTF(&minscore), next_p->pkg);
@ -1541,18 +1504,13 @@ int apk_solver_solve(struct apk_database *db,
/* need EXPAND if here, can return SOLUTION|PRUNED|EXPAND */
r = expand_branch(ss);
if (r == SOLVERR_SOLUTION) {
struct apk_score score;
score = ss->score;
addscore(&score, &ss->minimum_penalty);
if (cmpscore(&score, &ss->best_score) < 0) {
if (cmpscore(&ss->score, &ss->best_score) < 0) {
dbg_printf("updating best score "SCORE_FMT" (was: "SCORE_FMT")\n",
SCORE_PRINTF(&score),
SCORE_PRINTF(&ss->best_score));
record_solution(ss);
ss->best_score = score;
ss->best_score = ss->score;
}
r = SOLVERR_PRUNED;