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synced 2024-11-11 05:33:47 +01:00
Refactor out u64_dbl_t
This type saved a tiny amount of allocation, but not enough to be worth keeping. (This is in preparation for moving choose_array_element_by_weight)
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@ -67,7 +67,7 @@ typedef struct cert_list_t cert_list_t;
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/* static function prototypes */
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static int compute_weighted_bandwidths(const smartlist_t *sl,
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bandwidth_weight_rule_t rule,
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u64_dbl_t **bandwidths_out);
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double **bandwidths_out);
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static const routerstatus_t *router_pick_trusteddirserver_impl(
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const smartlist_t *sourcelist, dirinfo_type_t auth,
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int flags, int *n_busy_out);
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@ -1799,20 +1799,23 @@ dirserver_choose_by_weight(const smartlist_t *servers, double authority_weight)
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{
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int n = smartlist_len(servers);
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int i;
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u64_dbl_t *weights;
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double *weights_dbl;
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uint64_t *weights_u64;
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const dir_server_t *ds;
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weights = tor_calloc(n, sizeof(u64_dbl_t));
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weights_dbl = tor_calloc(n, sizeof(double));
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weights_u64 = tor_calloc(n, sizeof(uint64_t));
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for (i = 0; i < n; ++i) {
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ds = smartlist_get(servers, i);
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weights[i].dbl = ds->weight;
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weights_dbl[i] = ds->weight;
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if (ds->is_authority)
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weights[i].dbl *= authority_weight;
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weights_dbl[i] *= authority_weight;
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}
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scale_array_elements_to_u64(weights, n, NULL);
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i = choose_array_element_by_weight(weights, n);
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tor_free(weights);
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scale_array_elements_to_u64(weights_u64, weights_dbl, n, NULL);
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i = choose_array_element_by_weight(weights_u64, n);
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tor_free(weights_dbl);
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tor_free(weights_u64);
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return (i < 0) ? NULL : smartlist_get(servers, i);
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}
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@ -2075,7 +2078,8 @@ router_get_advertised_bandwidth_capped(const routerinfo_t *router)
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* much of the range of uint64_t. If <b>total_out</b> is provided, set it to
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* the sum of all elements in the array _before_ scaling. */
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STATIC void
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scale_array_elements_to_u64(u64_dbl_t *entries, int n_entries,
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scale_array_elements_to_u64(uint64_t *entries_out, const double *entries_in,
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int n_entries,
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uint64_t *total_out)
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{
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double total = 0.0;
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@ -2085,13 +2089,13 @@ scale_array_elements_to_u64(u64_dbl_t *entries, int n_entries,
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#define SCALE_TO_U64_MAX ((int64_t) (INT64_MAX / 4))
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for (i = 0; i < n_entries; ++i)
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total += entries[i].dbl;
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total += entries_in[i];
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if (total > 0.0)
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scale_factor = SCALE_TO_U64_MAX / total;
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for (i = 0; i < n_entries; ++i)
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entries[i].u64 = tor_llround(entries[i].dbl * scale_factor);
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entries_out[i] = tor_llround(entries_in[i] * scale_factor);
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if (total_out)
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*total_out = (uint64_t) total;
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@ -2119,7 +2123,7 @@ gt_i64_timei(uint64_t a, uint64_t b)
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* an index at random. Return -1 on error.
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*/
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STATIC int
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choose_array_element_by_weight(const u64_dbl_t *entries, int n_entries)
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choose_array_element_by_weight(const uint64_t *entries, int n_entries)
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{
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int i, i_chosen=-1, n_chosen=0;
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uint64_t total_so_far = 0;
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@ -2127,7 +2131,7 @@ choose_array_element_by_weight(const u64_dbl_t *entries, int n_entries)
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uint64_t total = 0;
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for (i = 0; i < n_entries; ++i)
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total += entries[i].u64;
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total += entries[i];
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if (n_entries < 1)
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return -1;
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@ -2140,7 +2144,7 @@ choose_array_element_by_weight(const u64_dbl_t *entries, int n_entries)
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rand_val = crypto_rand_uint64(total);
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for (i = 0; i < n_entries; ++i) {
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total_so_far += entries[i].u64;
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total_so_far += entries[i];
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if (gt_i64_timei(total_so_far, rand_val)) {
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i_chosen = i;
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n_chosen++;
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@ -2206,17 +2210,21 @@ static const node_t *
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smartlist_choose_node_by_bandwidth_weights(const smartlist_t *sl,
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bandwidth_weight_rule_t rule)
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{
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u64_dbl_t *bandwidths=NULL;
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double *bandwidths_dbl=NULL;
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uint64_t *bandwidths_u64=NULL;
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if (compute_weighted_bandwidths(sl, rule, &bandwidths) < 0)
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if (compute_weighted_bandwidths(sl, rule, &bandwidths_dbl) < 0)
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return NULL;
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scale_array_elements_to_u64(bandwidths, smartlist_len(sl), NULL);
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bandwidths_u64 = tor_calloc(smartlist_len(sl), sizeof(uint64_t));
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scale_array_elements_to_u64(bandwidths_u64, bandwidths_dbl,
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smartlist_len(sl), NULL);
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{
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int idx = choose_array_element_by_weight(bandwidths,
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int idx = choose_array_element_by_weight(bandwidths_u64,
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smartlist_len(sl));
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tor_free(bandwidths);
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tor_free(bandwidths_dbl);
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tor_free(bandwidths_u64);
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return idx < 0 ? NULL : smartlist_get(sl, idx);
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}
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}
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@ -2229,14 +2237,14 @@ smartlist_choose_node_by_bandwidth_weights(const smartlist_t *sl,
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static int
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compute_weighted_bandwidths(const smartlist_t *sl,
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bandwidth_weight_rule_t rule,
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u64_dbl_t **bandwidths_out)
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double **bandwidths_out)
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{
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int64_t weight_scale;
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double Wg = -1, Wm = -1, We = -1, Wd = -1;
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double Wgb = -1, Wmb = -1, Web = -1, Wdb = -1;
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uint64_t weighted_bw = 0;
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guardfraction_bandwidth_t guardfraction_bw;
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u64_dbl_t *bandwidths;
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double *bandwidths;
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/* Can't choose exit and guard at same time */
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tor_assert(rule == NO_WEIGHTING ||
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@ -2318,7 +2326,7 @@ compute_weighted_bandwidths(const smartlist_t *sl,
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Web /= weight_scale;
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Wdb /= weight_scale;
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bandwidths = tor_calloc(smartlist_len(sl), sizeof(u64_dbl_t));
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bandwidths = tor_calloc(smartlist_len(sl), sizeof(double));
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// Cycle through smartlist and total the bandwidth.
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static int warned_missing_bw = 0;
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@ -2405,7 +2413,7 @@ compute_weighted_bandwidths(const smartlist_t *sl,
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final_weight = weight*this_bw;
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}
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bandwidths[node_sl_idx].dbl = final_weight + 0.5;
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bandwidths[node_sl_idx] = final_weight + 0.5;
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} SMARTLIST_FOREACH_END(node);
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log_debug(LD_CIRC, "Generated weighted bandwidths for rule %s based "
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@ -2426,7 +2434,7 @@ double
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frac_nodes_with_descriptors(const smartlist_t *sl,
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bandwidth_weight_rule_t rule)
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{
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u64_dbl_t *bandwidths = NULL;
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double *bandwidths = NULL;
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double total, present;
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if (smartlist_len(sl) == 0)
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@ -2443,7 +2451,7 @@ frac_nodes_with_descriptors(const smartlist_t *sl,
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total = present = 0.0;
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SMARTLIST_FOREACH_BEGIN(sl, const node_t *, node) {
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const double bw = bandwidths[node_sl_idx].dbl;
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const double bw = bandwidths[node_sl_idx];
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total += bw;
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if (node_has_descriptor(node))
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present += bw;
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@ -217,17 +217,10 @@ int hex_digest_nickname_matches(const char *hexdigest,
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const char *nickname, int is_named);
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#ifdef ROUTERLIST_PRIVATE
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/** Helper type for choosing routers by bandwidth: contains a union of
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* double and uint64_t. Before we call scale_array_elements_to_u64, it holds
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* a double; after, it holds a uint64_t. */
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typedef union u64_dbl_t {
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uint64_t u64;
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double dbl;
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} u64_dbl_t;
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STATIC int choose_array_element_by_weight(const u64_dbl_t *entries,
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STATIC int choose_array_element_by_weight(const uint64_t *entries,
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int n_entries);
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STATIC void scale_array_elements_to_u64(u64_dbl_t *entries, int n_entries,
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STATIC void scale_array_elements_to_u64(uint64_t *entries_out,
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const double *entries_in, int n_entries,
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uint64_t *total_out);
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STATIC const routerstatus_t *router_pick_directory_server_impl(
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dirinfo_type_t auth, int flags,
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@ -2149,56 +2149,57 @@ test_dir_scale_bw(void *testdata)
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1.0/7,
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12.0,
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24.0 };
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u64_dbl_t vals[8];
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double vals_dbl[8];
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uint64_t vals_u64[8];
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uint64_t total;
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int i;
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(void) testdata;
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for (i=0; i<8; ++i)
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vals[i].dbl = v[i];
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vals_dbl[i] = v[i];
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scale_array_elements_to_u64(vals, 8, &total);
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scale_array_elements_to_u64(vals_u64, vals_dbl, 8, &total);
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tt_int_op((int)total, OP_EQ, 48);
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total = 0;
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for (i=0; i<8; ++i) {
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total += vals[i].u64;
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total += vals_u64[i];
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}
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tt_assert(total >= (U64_LITERAL(1)<<60));
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tt_assert(total <= (U64_LITERAL(1)<<62));
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for (i=0; i<8; ++i) {
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/* vals[2].u64 is the scaled value of 1.0 */
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double ratio = ((double)vals[i].u64) / vals[2].u64;
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double ratio = ((double)vals_u64[i]) / vals_u64[2];
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tt_double_op(fabs(ratio - v[i]), OP_LT, .00001);
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}
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/* test handling of no entries */
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total = 1;
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scale_array_elements_to_u64(vals, 0, &total);
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scale_array_elements_to_u64(vals_u64, vals_dbl, 0, &total);
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tt_assert(total == 0);
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/* make sure we don't read the array when we have no entries
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* may require compiler flags to catch NULL dereferences */
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total = 1;
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scale_array_elements_to_u64(NULL, 0, &total);
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scale_array_elements_to_u64(NULL, NULL, 0, &total);
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tt_assert(total == 0);
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scale_array_elements_to_u64(NULL, 0, NULL);
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scale_array_elements_to_u64(NULL, NULL, 0, NULL);
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/* test handling of zero totals */
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total = 1;
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vals[0].dbl = 0.0;
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scale_array_elements_to_u64(vals, 1, &total);
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vals_dbl[0] = 0.0;
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scale_array_elements_to_u64(vals_u64, vals_dbl, 1, &total);
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tt_assert(total == 0);
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tt_assert(vals[0].u64 == 0);
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tt_assert(vals_u64[0] == 0);
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vals[0].dbl = 0.0;
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vals[1].dbl = 0.0;
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scale_array_elements_to_u64(vals, 2, NULL);
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tt_assert(vals[0].u64 == 0);
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tt_assert(vals[1].u64 == 0);
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vals_dbl[0] = 0.0;
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vals_dbl[1] = 0.0;
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scale_array_elements_to_u64(vals_u64, vals_dbl, 2, NULL);
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tt_assert(vals_u64[0] == 0);
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tt_assert(vals_u64[1] == 0);
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done:
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;
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@ -2209,7 +2210,7 @@ test_dir_random_weighted(void *testdata)
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{
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int histogram[10];
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uint64_t vals[10] = {3,1,2,4,6,0,7,5,8,9}, total=0;
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u64_dbl_t inp[10];
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uint64_t inp_u64[10];
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int i, choice;
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const int n = 50000;
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double max_sq_error;
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@ -2219,12 +2220,12 @@ test_dir_random_weighted(void *testdata)
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* in a scrambled order to make sure we don't depend on order. */
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memset(histogram,0,sizeof(histogram));
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for (i=0; i<10; ++i) {
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inp[i].u64 = vals[i];
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inp_u64[i] = vals[i];
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total += vals[i];
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}
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tt_u64_op(total, OP_EQ, 45);
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for (i=0; i<n; ++i) {
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choice = choose_array_element_by_weight(inp, 10);
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choice = choose_array_element_by_weight(inp_u64, 10);
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tt_int_op(choice, OP_GE, 0);
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tt_int_op(choice, OP_LT, 10);
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histogram[choice]++;
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@ -2251,16 +2252,16 @@ test_dir_random_weighted(void *testdata)
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/* Now try a singleton; do we choose it? */
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for (i = 0; i < 100; ++i) {
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choice = choose_array_element_by_weight(inp, 1);
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choice = choose_array_element_by_weight(inp_u64, 1);
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tt_int_op(choice, OP_EQ, 0);
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}
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/* Now try an array of zeros. We should choose randomly. */
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memset(histogram,0,sizeof(histogram));
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for (i = 0; i < 5; ++i)
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inp[i].u64 = 0;
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inp_u64[i] = 0;
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for (i = 0; i < n; ++i) {
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choice = choose_array_element_by_weight(inp, 5);
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choice = choose_array_element_by_weight(inp_u64, 5);
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tt_int_op(choice, OP_GE, 0);
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tt_int_op(choice, OP_LT, 5);
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histogram[choice]++;
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