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3a0a730336
Asking xapian to sort the messages for us causes suboptimal IO patterns. This would be useful, if we only wanted the first few results, but since we want everything anyway, this is pessimization. On 2011-10-29, a measurement on a 372981 messages instance showed that wall time can be reduced from 28 minutes (sorted by Message-ID) to 15 minutes (unsorted). Timings on 189605 messages: $ time notmuch.old dump 19.48user 5.83system 12:10.42elapsed 3%CPU (0avgtext+0avgdata 110656maxresident)k 3629584inputs+22720outputs (33major+7073minor)pagefaults 0swaps $ echo 3 > /proc/sys/vm/drop_caches $ time notmuch.new 14.89user 1.20system 3:23.58elapsed 7%CPU (0avgtext+0avgdata 46032maxresident)k 1256264inputs+22464outputs (43major+1990minor)pagefaults 0swaps
115 lines
3 KiB
C
115 lines
3 KiB
C
/* notmuch - Not much of an email program, (just index and search)
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*
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* Copyright © 2009 Carl Worth
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see http://www.gnu.org/licenses/ .
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*
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* Author: Carl Worth <cworth@cworth.org>
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*/
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#include "notmuch-client.h"
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int
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notmuch_dump_command (unused (void *ctx), int argc, char *argv[])
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{
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notmuch_config_t *config;
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notmuch_database_t *notmuch;
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notmuch_query_t *query;
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FILE *output = stdout;
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notmuch_messages_t *messages;
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notmuch_message_t *message;
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notmuch_tags_t *tags;
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const char* query_str = "";
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config = notmuch_config_open (ctx, NULL, NULL);
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if (config == NULL)
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return 1;
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notmuch = notmuch_database_open (notmuch_config_get_database_path (config),
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NOTMUCH_DATABASE_MODE_READ_ONLY);
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if (notmuch == NULL)
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return 1;
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argc--; argv++; /* skip subcommand argument */
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if (argc && strcmp (argv[0], "--") != 0) {
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fprintf (stderr, "Warning: the output file argument of dump is deprecated.\n");
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output = fopen (argv[0], "w");
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if (output == NULL) {
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fprintf (stderr, "Error opening %s for writing: %s\n",
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argv[0], strerror (errno));
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return 1;
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}
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argc--;
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argv++;
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}
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if (argc && strcmp (argv[0], "--") == 0){
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argc--;
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argv++;
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}
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if (argc) {
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query_str = query_string_from_args (notmuch, argc, argv);
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if (query_str == NULL) {
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fprintf (stderr, "Out of memory.\n");
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return 1;
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}
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}
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query = notmuch_query_create (notmuch, query_str);
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if (query == NULL) {
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fprintf (stderr, "Out of memory\n");
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return 1;
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}
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/* Don't ask xapian to sort by Message-ID. Xapian optimizes returning the
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* first results quickly at the expense of total time.
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*/
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notmuch_query_set_sort (query, NOTMUCH_SORT_UNSORTED);
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for (messages = notmuch_query_search_messages (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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int first = 1;
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message = notmuch_messages_get (messages);
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fprintf (output,
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"%s (", notmuch_message_get_message_id (message));
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for (tags = notmuch_message_get_tags (message);
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notmuch_tags_valid (tags);
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notmuch_tags_move_to_next (tags))
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{
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if (! first)
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fprintf (output, " ");
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fprintf (output, "%s", notmuch_tags_get (tags));
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first = 0;
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}
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fprintf (output, ")\n");
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notmuch_message_destroy (message);
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}
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if (output != stdout)
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fclose (output);
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notmuch_query_destroy (query);
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notmuch_database_close (notmuch);
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return 0;
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}
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