Diffstat (limited to 'README')
| -rw-r--r-- | README | 54 |
1 files changed, 0 insertions, 54 deletions
@@ -1,54 +0,0 @@ -Cache algorithm -=============== - -Cgit normally returns cached pages when invoked. If there is no cache file, or -the cache file has expired, it is regenerated. Finally, the cache file is -printed on stdout. - -When it is decided that a cache file needs to be regenerated, an attempt is -made to create a corresponding lockfile. If this fails, the process gives up -and uses the expired cache file instead. - -When there is no cache file for a request, an attempt is made to create a -corresponding lockfile. If this fails, the process calls sched_yield(2) before -restarting the request handling. - -In pseudocode: - - name = generate_cache_name(request); -top: - if (!exists(name)) { - if (lock_cache(name)) { - generate_cache(request, name); - unlock_cache(name); - } else { - sched_yield(); - goto top; - } - } else if (expired(name)) { - if (lock_cache(name)) { - generate_cache(request, name); - unlock_cache(name); - } - } - print_file(name); - - -The following options can be set in /etc/cgitrc to control cache behaviour: - cache-root: root directory for cache files - cache-root-ttl: TTL for the repo listing page - cache-repo-ttl: TTL for any repos summary page - cache-dynamic-ttl: TTL for pages with symbolic references (not SHA1) - cache-static-ttl: TTL for pages with sha1 references - -TTL is specified in minutes, -1 meaning "infinite caching". - - -Naming of cache files ---------------------- -Repository listing: <cachedir>/index.html -Repository summary: <cachedir>/<repo>/index.html -Repository subpage: <cachedir>/<repo>/<page>/<querystring>.html - -The corresponding lock files have a ".lock" suffix. - |