From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from localhost (localhost [127.0.0.1]) by olra.theworths.org (Postfix) with ESMTP id EF0EE431FB6 for ; Sat, 24 Nov 2012 13:20:49 -0800 (PST) X-Virus-Scanned: Debian amavisd-new at olra.theworths.org X-Spam-Flag: NO X-Spam-Score: 0 X-Spam-Level: X-Spam-Status: No, score=0 tagged_above=-999 required=5 tests=[none] autolearn=disabled Received: from olra.theworths.org ([127.0.0.1]) by localhost (olra.theworths.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id MLMEYppo2iXn for ; Sat, 24 Nov 2012 13:20:48 -0800 (PST) Received: from tesseract.cs.unb.ca (tesseract.cs.unb.ca [131.202.240.238]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by olra.theworths.org (Postfix) with ESMTPS id 8FC0D431FDE for ; Sat, 24 Nov 2012 13:20:34 -0800 (PST) Received: from fctnnbsc30w-156034089108.dhcp-dynamic.fibreop.nb.bellaliant.net ([156.34.89.108] helo=zancas.localnet) by tesseract.cs.unb.ca with esmtpsa (TLS1.0:DHE_RSA_AES_128_CBC_SHA1:16) (Exim 4.72) (envelope-from ) id 1TcN9N-0006SX-Ni; Sat, 24 Nov 2012 17:20:34 -0400 Received: from bremner by zancas.localnet with local (Exim 4.80) (envelope-from ) id 1TcN9I-0008Di-7w; Sat, 24 Nov 2012 17:20:28 -0400 From: david@tethera.net To: notmuch@notmuchmail.org Subject: [Patch v2 17/17] tag-util: optimization of tag application Date: Sat, 24 Nov 2012 17:20:17 -0400 Message-Id: <1353792017-31459-18-git-send-email-david@tethera.net> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1353792017-31459-1-git-send-email-david@tethera.net> References: <1353792017-31459-1-git-send-email-david@tethera.net> X-Spam_bar: - Cc: David Bremner X-BeenThere: notmuch@notmuchmail.org X-Mailman-Version: 2.1.13 Precedence: list List-Id: "Use and development of the notmuch mail system." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 24 Nov 2012 21:20:50 -0000 From: David Bremner The idea is not to bother with restore operations if they don't change the set of tags. This is actually a relatively common case. In order to avoid fancy datastructures, this method is quadratic in the number of tags; at least on my mail database this doesn't seem to be a big problem. --- notmuch-tag.c | 2 +- tag-util.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 60 insertions(+), 1 deletion(-) diff --git a/notmuch-tag.c b/notmuch-tag.c index 8a8af0b..e4fca67 100644 --- a/notmuch-tag.c +++ b/notmuch-tag.c @@ -140,7 +140,7 @@ tag_query (void *ctx, notmuch_database_t *notmuch, const char *query_string, notmuch_messages_valid (messages) && ! interrupted; notmuch_messages_move_to_next (messages)) { message = notmuch_messages_get (messages); - tag_op_list_apply (message, tag_ops, flags); + tag_op_list_apply (message, tag_ops, flags | TAG_FLAG_PRE_OPTIMIZED); notmuch_message_destroy (message); } diff --git a/tag-util.c b/tag-util.c index 287cc67..2bb8355 100644 --- a/tag-util.c +++ b/tag-util.c @@ -111,6 +111,62 @@ message_error (notmuch_message_t *message, fprintf (stderr, "Status: %s\n", notmuch_status_to_string (status)); } +static int +makes_changes (notmuch_message_t *message, + tag_op_list_t *list, + tag_op_flag_t flags) +{ + + int i; + + notmuch_tags_t *tags; + notmuch_bool_t changes = FALSE; + + /* First, do we delete an existing tag? */ + changes = FALSE; + for (tags = notmuch_message_get_tags (message); + ! changes && notmuch_tags_valid (tags); + notmuch_tags_move_to_next (tags)) { + const char *cur_tag = notmuch_tags_get (tags); + int last_op = (flags & TAG_FLAG_REMOVE_ALL) ? -1 : 0; + + for (i = 0; i < list->count; i++) { + if (strcmp (cur_tag, list->ops[i].tag) == 0) { + last_op = list->ops[i].remove ? -1 : 1; + } + } + + changes = (last_op == -1); + } + notmuch_tags_destroy (tags); + + if (changes) + return TRUE; + + /* Now check for adding new tags */ + for (i = 0; i < list->count; i++) { + notmuch_bool_t exists = FALSE; + + for (tags = notmuch_message_get_tags (message); + notmuch_tags_valid (tags); + notmuch_tags_move_to_next (tags)) { + const char *cur_tag = notmuch_tags_get (tags); + if (strcmp (cur_tag, list->ops[i].tag) == 0) { + exists = TRUE; + break; + } + } + notmuch_tags_destroy (tags); + + /* the following test is conservative, it's ok to think we + * make changes when we don't */ + if ( ! exists && ! list->ops[i].remove ) + return TRUE; + } + return FALSE; + +} + notmuch_status_t tag_op_list_apply (notmuch_message_t *message, tag_op_list_t *list, @@ -121,6 +177,9 @@ tag_op_list_apply (notmuch_message_t *message, notmuch_status_t status = 0; tag_operation_t *tag_ops = list->ops; + if (! (flags & TAG_FLAG_PRE_OPTIMIZED) && ! makes_changes (message, list, flags)) + return NOTMUCH_STATUS_SUCCESS; + status = notmuch_message_freeze (message); if (status) { message_error (message, status, "freezing message"); -- 1.7.10.4