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Man Pages

Manual Reference Pages  -  DIDUMP (8)


didump - Diablo program to dump the dhistory database

diload - Diablo program to append to the dhistory database




didump [ -e ] [ -f ] [ -H ] [ -h ] [ -l ] [ -n ] [ -o ] [ -p ] [ -rN ] [ -TN ] [ -t ] [ -v ] [ -x ] [ -C diablo.config ] [ -d[n] ] [ -V ] [ \@offset ] dhistory-file

diload [ -f ] [ -h hashtablesize ] [ -u ] [ -v ] [ -C diablo.config ] [ -d[n] ] [ -V ] [ dhistory-file ]


Didump dumps the specified dhistory file into a human readable format. It is used to debug the dhistory database, to recover a corrupted dhistory file. In combination with diload, didump may be used to remove expired entries over rememberdays days old from the dhistory file.

-e is used to cause didump to generate ENTRIES lines - useful for diload progress.

-f with a normal dump (no -t), seeks to the end of the history file and prints out entries as other programs (diablo) add them. DiDump will not exit in this case. This option is useful to get an idea of the aggregate incoming article rate. NOTE, however, that diablo does not add history file entries with a simple append, so you may see blank records in the output that, in fact, are filled-in later.

-H Dump a hash trace for specified Message-ID or hash.

-h For each entry dumped, lookup the hash in the history file to verify that it is available via normal lookup.

-l is used to force didump to flush each line to the output rather then buffer the output, useful when running "didump -f dhistory | dreadart -v -f -" or something of that ilk.

-n Also print the value of the ’next’ pointer.

-o didump V1.08 can read older (V1.07 or smaller) Diablo dhistory files if this option is specified. This is used when upgrading to 1.08 to reload the dhistory file with the dhistory file format.

-p Displays progress on stdout. Note that the total records may not be accurate if the -x or -T options are used because didump doesn’t know how many records will be displayed.

-rN Set the rememberdays value to N. The rememberdays value specifies the number of days worth of expired articles to keep. The default is obtained from ‘‘diablo.config’’ and a value of ’-1’ will cause didump to not dump any expired articles. If the value has ’s’, ’m’ or ’h’ appended, the numeric value is taken as seconds, minutes or hours, respectively. This option has no effect without the ‘‘-x’’ option.

-TN Don’t dump records older than N seconds. The time value can be suffixed with ’d’, ’h’ or ’m’ to specify days, hours or minutes. The default is ’-1’ which means dump all records.

-t is used for debugging and causes didump to attempt to trace the dhistory file’s hash table links. It is very inefficient.

-v is used to generate additional information, such as the spool file containing the article.

-x causes didump to not dump expired entries that are over rememberdays days old.

-C allows the specification of the path of the diablo.config file to use.

-d[n] will set debug mode, at optional level n.

-V will print the version and exit.

Generally speaking, when recovering a dhistory file or trimming off obsolete entries, didump or didump -x is run with the existing history file as an argument, and the output is piped to diload -f tempfile. Once the recovery is complete, the temporary history file is then renamed to become the actual history file. The diablo server must be paused during such operations to prevent it from acting on the ’old’ version of the history file while the new one is being constructed.

Diload takes history data on the standard input and appends it to the specified history file. If no history file is specified, the active dhistory database is used. If any given record already exists in the dhistory file, the new record is thrown away and the original record left intact. You can safely run diload to append new entries without shutting the main Diablo server down, but Diablo must be properly paused and restarted if you intend to rewrite the history file.

-f Turn on special-fast mode. This locks the history file through the entire procedure and makes the assumption that entries being added did not previously exist. This also causes the base hash table to be cached and written then written out when the load operation has completed. DiLoad will create the history file you supply as an argument and will refuse to run if it is already pre-existing. This is used in the weekly trimming script to quickly rebuild the history file from a dump.

-h hashtablesize The default hash table size is configured in the diablo.config configuration file, and is the best way to set the size. Alternatively, you can use this option to set it to any power of two. For a transit server, the suggested size is 4m or 8m. For a spool server, the optimal size is a power of two slightly less than the number of articles you plan to store (i.e. if you have 90 million articles, 64m or perhaps 32m). Do NOT forget the ’m’ for million, or you will be a very unhappy camper. Please note that if you create a larger history hash in this manner, the next run of diload (perhaps from biweekly.atrim) will still only create a table the size of whatever the configured default is, so be sure to modify your diablo.config or biweekly.atrim to reflect any appropriate changes.

-u May be used with special-fast mode to re-enable checking for duplicates. You have the advantage of locking the history file throughout the entire operation, but can still use a pre-existing history file to ’update’.

-v will turn on verbose mode. diload prints out its progress.

-C allows the specification of the path of the diablo.config file to use.

-d[n] will set debug mode, at optional level n.

-V will print the version and exit.


diablo(8), dicmd(8), didump(8), diload(8), dnewslink(8), doutq(8), dexpire(8), dexpireover(8), diconvhist(8), dilookup(8), dspoolout(8), dnewsfeeds(5), dkp(8), dpath(8), diablo-kp(5), diablo-files(5)

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