mirror of
https://git.notmuchmail.org/git/notmuch
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Optimize thread search using matched docid sets.
This reduces thread search's 1+2t Xapian queries (where t is the number of matched threads) to 1+t queries and constructs exactly one notmuch_message_t for each message instead of 2 to 3. notmuch_query_search_threads eagerly fetches the docids of all messages matching the user query instead of lazily constructing message objects and fetching thread ID's from term lists. _notmuch_thread_create takes a seed docid and the set of all matched docids and uses a single Xapian query to expand this docid to its containing thread, using the matched docid set to determine which messages in the thread match the user query instead of using a second Xapian query. This reduces the amount of time required to load my inbox from 4.523 seconds to 3.025 seconds (1.5X faster).
This commit is contained in:
Austin Clements
Carl Worth
parent
e255654232
commit
b3caef1f06
4 changed files with 155 additions and 113 deletions
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@ -254,6 +254,12 @@ _notmuch_message_create_for_message_id (notmuch_database_t *notmuch,
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return message;
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}
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unsigned int
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_notmuch_message_get_doc_id (notmuch_message_t *message)
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{
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return message->doc_id;
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}
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const char *
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notmuch_message_get_message_id (notmuch_message_t *message)
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{
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@ -156,6 +156,8 @@ typedef enum _notmuch_private_status {
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: \
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(notmuch_status_t) private_status)
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typedef struct _notmuch_doc_id_set notmuch_doc_id_set_t;
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/* database.cc */
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/* Lookup a prefix value by name.
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@ -222,8 +224,8 @@ _notmuch_directory_get_document_id (notmuch_directory_t *directory);
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notmuch_thread_t *
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_notmuch_thread_create (void *ctx,
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notmuch_database_t *notmuch,
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const char *thread_id,
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const char *query_string,
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unsigned int seed_doc_id,
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notmuch_doc_id_set_t *match_set,
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notmuch_sort_t sort);
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/* message.cc */
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@ -239,6 +241,9 @@ _notmuch_message_create_for_message_id (notmuch_database_t *notmuch,
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const char *message_id,
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notmuch_private_status_t *status);
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unsigned int
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_notmuch_message_get_doc_id (notmuch_message_t *message);
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const char *
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_notmuch_message_get_in_reply_to (notmuch_message_t *message);
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@ -426,6 +431,14 @@ _notmuch_mset_messages_get (notmuch_messages_t *messages);
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void
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_notmuch_mset_messages_move_to_next (notmuch_messages_t *messages);
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notmuch_bool_t
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_notmuch_doc_id_set_contains (notmuch_doc_id_set_t *doc_ids,
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unsigned int doc_id);
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void
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_notmuch_doc_id_set_remove (notmuch_doc_id_set_t *doc_ids,
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unsigned int doc_id);
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/* message.cc */
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void
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142
lib/query.cc
142
lib/query.cc
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@ -36,13 +36,21 @@ typedef struct _notmuch_mset_messages {
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Xapian::MSetIterator iterator_end;
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} notmuch_mset_messages_t;
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struct _notmuch_doc_id_set {
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unsigned int *bitmap;
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unsigned int bound;
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};
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struct _notmuch_threads {
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notmuch_query_t *query;
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GHashTable *threads;
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notmuch_messages_t *messages;
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/* This thread ID is our iterator state. */
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const char *thread_id;
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/* The ordered list of doc ids matched by the query. */
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GArray *doc_ids;
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/* Our iterator's current position in doc_ids. */
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unsigned int doc_id_pos;
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/* The set of matched docid's that have not been assigned to a
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* thread. Initially, this contains every docid in doc_ids. */
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notmuch_doc_id_set_t match_set;
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};
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notmuch_query_t *
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@ -195,6 +203,19 @@ _notmuch_mset_messages_valid (notmuch_messages_t *messages)
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return (mset_messages->iterator != mset_messages->iterator_end);
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}
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static Xapian::docid
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_notmuch_mset_messages_get_doc_id (notmuch_messages_t *messages)
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{
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notmuch_mset_messages_t *mset_messages;
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mset_messages = (notmuch_mset_messages_t *) messages;
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if (! _notmuch_mset_messages_valid (&mset_messages->base))
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return 0;
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return *mset_messages->iterator;
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}
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notmuch_message_t *
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_notmuch_mset_messages_get (notmuch_messages_t *messages)
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{
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@ -233,6 +254,49 @@ _notmuch_mset_messages_move_to_next (notmuch_messages_t *messages)
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mset_messages->iterator++;
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}
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static notmuch_bool_t
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_notmuch_doc_id_set_init (void *ctx,
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notmuch_doc_id_set_t *doc_ids,
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GArray *arr, unsigned int bound)
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{
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size_t count = (bound + sizeof (doc_ids->bitmap[0]) - 1) /
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sizeof (doc_ids->bitmap[0]);
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unsigned int *bitmap = talloc_zero_array (ctx, unsigned int, count);
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if (bitmap == NULL)
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return FALSE;
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doc_ids->bitmap = bitmap;
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doc_ids->bound = bound;
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for (unsigned int i = 0; i < arr->len; i++) {
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unsigned int doc_id = g_array_index(arr, unsigned int, i);
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bitmap[doc_id / sizeof (bitmap[0])] |=
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1 << (doc_id % sizeof (bitmap[0]));
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}
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return TRUE;
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}
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notmuch_bool_t
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_notmuch_doc_id_set_contains (notmuch_doc_id_set_t *doc_ids,
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unsigned int doc_id)
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{
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if (doc_id >= doc_ids->bound)
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return FALSE;
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return (doc_ids->bitmap[doc_id / sizeof (doc_ids->bitmap[0])] &
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(1 << (doc_id % sizeof (doc_ids->bitmap[0])))) != 0;
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}
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void
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_notmuch_doc_id_set_remove (notmuch_doc_id_set_t *doc_ids,
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unsigned int doc_id)
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{
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if (doc_id < doc_ids->bound)
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doc_ids->bitmap[doc_id / sizeof (doc_ids->bitmap[0])] &=
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~(1 << (doc_id % sizeof (doc_ids->bitmap[0])));
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}
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/* Glib objects force use to use a talloc destructor as well, (but not
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* nearly as ugly as the for messages due to C++ objects). At
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* this point, I'd really like to have some talloc-friendly
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@ -240,7 +304,8 @@ _notmuch_mset_messages_move_to_next (notmuch_messages_t *messages)
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static int
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_notmuch_threads_destructor (notmuch_threads_t *threads)
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{
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g_hash_table_unref (threads->threads);
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if (threads->doc_ids)
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g_array_unref (threads->doc_ids);
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return 0;
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}
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@ -249,24 +314,39 @@ notmuch_threads_t *
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notmuch_query_search_threads (notmuch_query_t *query)
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{
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notmuch_threads_t *threads;
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notmuch_messages_t *messages;
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Xapian::docid max_doc_id = 0;
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threads = talloc (query, notmuch_threads_t);
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if (threads == NULL)
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return NULL;
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threads->doc_ids = NULL;
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talloc_set_destructor (threads, _notmuch_threads_destructor);
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threads->query = query;
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threads->threads = g_hash_table_new_full (g_str_hash, g_str_equal,
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free, NULL);
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threads->messages = notmuch_query_search_messages (query);
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if (threads->messages == NULL) {
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messages = notmuch_query_search_messages (query);
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if (messages == NULL) {
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talloc_free (threads);
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return NULL;
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}
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threads->thread_id = NULL;
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threads->doc_ids = g_array_new (FALSE, FALSE, sizeof (unsigned int));
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while (notmuch_messages_valid (messages)) {
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unsigned int doc_id = _notmuch_mset_messages_get_doc_id (messages);
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g_array_append_val (threads->doc_ids, doc_id);
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max_doc_id = MAX (max_doc_id, doc_id);
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notmuch_messages_move_to_next (messages);
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}
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threads->doc_id_pos = 0;
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talloc_set_destructor (threads, _notmuch_threads_destructor);
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talloc_free (messages);
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if (! _notmuch_doc_id_set_init (threads, &threads->match_set,
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threads->doc_ids, max_doc_id + 1)) {
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talloc_free (threads);
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return NULL;
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}
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return threads;
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}
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@ -280,51 +360,41 @@ notmuch_query_destroy (notmuch_query_t *query)
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notmuch_bool_t
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notmuch_threads_valid (notmuch_threads_t *threads)
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{
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notmuch_message_t *message;
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unsigned int doc_id;
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if (threads->thread_id)
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return TRUE;
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while (threads->doc_id_pos < threads->doc_ids->len) {
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doc_id = g_array_index (threads->doc_ids, unsigned int,
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threads->doc_id_pos);
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if (_notmuch_doc_id_set_contains (&threads->match_set, doc_id))
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break;
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while (notmuch_messages_valid (threads->messages))
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{
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message = notmuch_messages_get (threads->messages);
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threads->thread_id = notmuch_message_get_thread_id (message);
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if (! g_hash_table_lookup_extended (threads->threads,
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threads->thread_id,
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NULL, NULL))
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{
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g_hash_table_insert (threads->threads,
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xstrdup (threads->thread_id), NULL);
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notmuch_messages_move_to_next (threads->messages);
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return TRUE;
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threads->doc_id_pos++;
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}
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notmuch_messages_move_to_next (threads->messages);
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}
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threads->thread_id = NULL;
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return FALSE;
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return threads->doc_id_pos < threads->doc_ids->len;
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}
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notmuch_thread_t *
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notmuch_threads_get (notmuch_threads_t *threads)
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{
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unsigned int doc_id;
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if (! notmuch_threads_valid (threads))
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return NULL;
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doc_id = g_array_index (threads->doc_ids, unsigned int,
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threads->doc_id_pos);
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return _notmuch_thread_create (threads->query,
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threads->query->notmuch,
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threads->thread_id,
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threads->query->query_string,
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doc_id,
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&threads->match_set,
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threads->query->sort);
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}
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void
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notmuch_threads_move_to_next (notmuch_threads_t *threads)
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{
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threads->thread_id = NULL;
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threads->doc_id_pos++;
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}
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void
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103
lib/thread.cc
103
lib/thread.cc
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@ -371,16 +371,17 @@ _resolve_thread_relationships (unused (notmuch_thread_t *thread))
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*/
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}
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/* Create a new notmuch_thread_t object for the given thread ID,
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* treating any messages matching 'query_string' as "matched".
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/* Create a new notmuch_thread_t object by finding the thread
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* containing the message with the given doc ID, treating any messages
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* contained in match_set as "matched". Remove all messages in the
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* thread from match_set.
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*
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* Creating the thread will trigger two database searches. The first
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* is for all messages belonging to the thread, (to get the first
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* subject line, the total count of messages, and all authors). The
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* second search is for all messages that are in the thread and that
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* also match the given query_string. This is to allow for a separate
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* count of matched messages, and to allow a viewer to display these
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* messages differently.
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* Creating the thread will perform a database search to get all
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* messages belonging to the thread and will get the first subject
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* line, the total count of messages, and all authors in the thread.
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* Each message in the thread is checked against match_set to allow
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* for a separate count of matched messages, and to allow a viewer to
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* display these messages differently.
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*
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* Here, 'ctx' is talloc context for the resulting thread object.
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*
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@ -389,53 +390,28 @@ _resolve_thread_relationships (unused (notmuch_thread_t *thread))
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notmuch_thread_t *
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_notmuch_thread_create (void *ctx,
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notmuch_database_t *notmuch,
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const char *thread_id,
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const char *query_string,
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unsigned int seed_doc_id,
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notmuch_doc_id_set_t *match_set,
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notmuch_sort_t sort)
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{
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notmuch_thread_t *thread;
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notmuch_message_t *seed_message;
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const char *thread_id;
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const char *thread_id_query_string;
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notmuch_query_t *thread_id_query;
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notmuch_messages_t *messages;
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notmuch_message_t *message;
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notmuch_bool_t matched_is_subset_of_thread;
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seed_message = _notmuch_message_create (ctx, notmuch, seed_doc_id, NULL);
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if (! seed_message)
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INTERNAL_ERROR ("Thread seed message %u does not exist", seed_doc_id);
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thread_id = notmuch_message_get_thread_id (seed_message);
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thread_id_query_string = talloc_asprintf (ctx, "thread:%s", thread_id);
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if (unlikely (query_string == NULL))
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if (unlikely (thread_id_query_string == NULL))
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return NULL;
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/* Under normal circumstances we need to do two database
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* queries. One is for the thread itself (thread_id_query_string)
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* and the second is to determine which messages in that thread
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* match the original query (matched_query_string).
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*
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* But under two circumstances, we use only the
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* thread_id_query_string:
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*
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* 1. If the original query_string *is* just the thread
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* specification.
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*
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* 2. If the original query_string matches all messages ("" or
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* "*").
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*
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* In either of these cases, we can be more efficient by running
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* just the thread_id query (since we know all messages in the
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* thread will match the query_string).
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*
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* Beyond the performance advantage, in the second case, it's
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* important to not try to create a concatenated query because our
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* parser handles "" and "*" as special cases and will not do the
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* right thing with a query string of "* and thread:<foo>".
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**/
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matched_is_subset_of_thread = 1;
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if (strcmp (query_string, thread_id_query_string) == 0 ||
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strcmp (query_string, "") == 0 ||
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strcmp (query_string, "*") == 0)
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{
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matched_is_subset_of_thread = 0;
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}
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thread_id_query = notmuch_query_create (notmuch, thread_id_query_string);
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if (unlikely (thread_id_query == NULL))
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return NULL;
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@ -482,48 +458,25 @@ _notmuch_thread_create (void *ctx,
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notmuch_messages_valid (messages);
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notmuch_messages_move_to_next (messages))
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{
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unsigned int doc_id;
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message = notmuch_messages_get (messages);
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doc_id = _notmuch_message_get_doc_id (message);
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if (doc_id == seed_doc_id)
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message = seed_message;
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_thread_add_message (thread, message);
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if (! matched_is_subset_of_thread)
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if ( _notmuch_doc_id_set_contains (match_set, doc_id)) {
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_notmuch_doc_id_set_remove (match_set, doc_id);
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_thread_add_matched_message (thread, message, sort);
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}
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_notmuch_message_close (message);
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}
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notmuch_query_destroy (thread_id_query);
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if (matched_is_subset_of_thread)
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{
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const char *matched_query_string;
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notmuch_query_t *matched_query;
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matched_query_string = talloc_asprintf (ctx, "%s AND (%s)",
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thread_id_query_string,
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query_string);
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if (unlikely (matched_query_string == NULL))
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return NULL;
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matched_query = notmuch_query_create (notmuch, matched_query_string);
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if (unlikely (matched_query == NULL))
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return NULL;
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/* As above, we use oldest-first order unconditionally here. */
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notmuch_query_set_sort (matched_query, NOTMUCH_SORT_OLDEST_FIRST);
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for (messages = notmuch_query_search_messages (matched_query);
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notmuch_messages_valid (messages);
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notmuch_messages_move_to_next (messages))
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{
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message = notmuch_messages_get (messages);
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_thread_add_matched_message (thread, message, sort);
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_notmuch_message_close (message);
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}
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notmuch_query_destroy (matched_query);
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}
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_resolve_thread_authors_string (thread);
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_resolve_thread_relationships (thread);
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