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src/subversion/subversion/libsvn_fs_fs/fs_fs.c  view on Meta::CPAN

    }
  else
    {
      ffd->revprop_pack_size = 0x10000;
      ffd->compress_packed_revprops = FALSE;
    }

  return SVN_NO_ERROR;
}

static svn_error_t *
write_config(svn_fs_t *fs,
             apr_pool_t *pool)
{
#define NL APR_EOL_STR
  static const char * const fsfs_conf_contents =
"### This file controls the configuration of the FSFS filesystem."           NL
""                                                                           NL
"[" SVN_CACHE_CONFIG_CATEGORY_MEMCACHED_SERVERS "]"                          NL
"### These options name memcached servers used to cache internal FSFS"       NL
"### data.  See http://www.danga.com/memcached/ for more information on"     NL
"### memcached.  To use memcached with FSFS, run one or more memcached"      NL
"### servers, and specify each of them as an option like so:"                NL
"# first-server = 127.0.0.1:11211"                                           NL
"# remote-memcached = mymemcached.corp.example.com:11212"                    NL
"### The option name is ignored; the value is of the form HOST:PORT."        NL
"### memcached servers can be shared between multiple repositories;"         NL
"### however, if you do this, you *must* ensure that repositories have"      NL
"### distinct UUIDs and paths, or else cached data from one repository"      NL
"### might be used by another accidentally.  Note also that memcached has"   NL
"### no authentication for reads or writes, so you must ensure that your"    NL
"### memcached servers are only accessible by trusted users."                NL
""                                                                           NL
"[" CONFIG_SECTION_CACHES "]"                                                NL
"### When a cache-related error occurs, normally Subversion ignores it"      NL
"### and continues, logging an error if the server is appropriately"         NL
"### configured (and ignoring it with file:// access).  To make"             NL
"### Subversion never ignore cache errors, uncomment this line."             NL
"# " CONFIG_OPTION_FAIL_STOP " = true"                                       NL
""                                                                           NL
"[" CONFIG_SECTION_REP_SHARING "]"                                           NL
"### To conserve space, the filesystem can optionally avoid storing"         NL
"### duplicate representations.  This comes at a slight cost in"             NL
"### performance, as maintaining a database of shared representations can"   NL
"### increase commit times.  The space savings are dependent upon the size"  NL
"### of the repository, the number of objects it contains and the amount of" NL
"### duplication between them, usually a function of the branching and"      NL
"### merging process."                                                       NL
"###"                                                                        NL
"### The following parameter enables rep-sharing in the repository.  It can" NL
"### be switched on and off at will, but for best space-saving results"      NL
"### should be enabled consistently over the life of the repository."        NL
"### 'svnadmin verify' will check the rep-cache regardless of this setting." NL
"### rep-sharing is enabled by default."                                     NL
"# " CONFIG_OPTION_ENABLE_REP_SHARING " = true"                              NL
""                                                                           NL
"[" CONFIG_SECTION_DELTIFICATION "]"                                         NL
"### To conserve space, the filesystem stores data as differences against"   NL
"### existing representations.  This comes at a slight cost in performance," NL
"### as calculating differences can increase commit times.  Reading data"    NL
"### will also create higher CPU load and the data will be fragmented."      NL
"### Since deltification tends to save significant amounts of disk space,"   NL
"### the overall I/O load can actually be lower."                            NL
"###"                                                                        NL
"### The options in this section allow for tuning the deltification"         NL
"### strategy.  Their effects on data size and server performance may vary"  NL
"### from one repository to another.  Versions prior to 1.8 will ignore"     NL
"### this section."                                                          NL
"###"                                                                        NL
"### The following parameter enables deltification for directories. It can"  NL
"### be switched on and off at will, but for best space-saving results"      NL
"### should be enabled consistently over the life of the repository."        NL
"### Repositories containing large directories will benefit greatly."        NL
"### In rarely read repositories, the I/O overhead may be significant as"    NL
"### cache hit rates will most likely be low"                                NL
"### directory deltification is disabled by default."                        NL
"# " CONFIG_OPTION_ENABLE_DIR_DELTIFICATION " = false"                       NL
"###"                                                                        NL
"### The following parameter enables deltification for properties on files"  NL
"### and directories.  Overall, this is a minor tuning option but can save"  NL
"### some disk space if you merge frequently or frequently change node"      NL
"### properties.  You should not activate this if rep-sharing has been"      NL
"### disabled because this may result in a net increase in repository size." NL
"### property deltification is disabled by default."                         NL
"# " CONFIG_OPTION_ENABLE_PROPS_DELTIFICATION " = false"                     NL
"###"                                                                        NL
"### During commit, the server may need to walk the whole change history of" NL
"### of a given node to find a suitable deltification base.  This linear"    NL
"### process can impact commit times, svnadmin load and similar operations." NL
"### This setting limits the depth of the deltification history.  If the"    NL
"### threshold has been reached, the node will be stored as fulltext and a"  NL
"### new deltification history begins."                                      NL
"### Note, this is unrelated to svn log."                                    NL
"### Very large values rarely provide significant additional savings but"    NL
"### can impact performance greatly - in particular if directory"            NL
"### deltification has been activated.  Very small values may be useful in"  NL
"### repositories that are dominated by large, changing binaries."           NL
"### Should be a power of two minus 1.  A value of 0 will effectively"       NL
"### disable deltification."                                                 NL
"### For 1.8, the default value is 1023; earlier versions have no limit."    NL
"# " CONFIG_OPTION_MAX_DELTIFICATION_WALK " = 1023"                          NL
"###"                                                                        NL
"### The skip-delta scheme used by FSFS tends to repeatably store redundant" NL
"### delta information where a simple delta against the latest version is"   NL
"### often smaller.  By default, 1.8+ will therefore use skip deltas only"   NL
"### after the linear chain of deltas has grown beyond the threshold"        NL
"### specified by this setting."                                             NL
"### Values up to 64 can result in some reduction in repository size for"    NL
"### the cost of quickly increasing I/O and CPU costs. Similarly, smaller"   NL
"### numbers can reduce those costs at the cost of more disk space.  For"    NL
"### rarely read repositories or those containing larger binaries, this may" NL
"### present a better trade-off."                                            NL
"### Should be a power of two.  A value of 1 or smaller will cause the"      NL
"### exclusive use of skip-deltas (as in pre-1.8)."                          NL
"### For 1.8, the default value is 16; earlier versions use 1."              NL
"# " CONFIG_OPTION_MAX_LINEAR_DELTIFICATION " = 16"                          NL
""                                                                           NL
"[" CONFIG_SECTION_PACKED_REVPROPS "]"                                       NL
"### This parameter controls the size (in kBytes) of packed revprop files."  NL
"### Revprops of consecutive revisions will be concatenated into a single"   NL
"### file up to but not exceeding the threshold given here.  However, each"  NL