ClearCase Reference Manual, Release 4.0, Windows

getcache

Displays cache information

APPLICABILITY

ClearCase (cleartool subcommand), Attache (command)

SYNOPSIS

Display/reset statistics for a view:

getcache -vie·w [ -a·ll | -s·hort ] [ -reset ] { -cvi·ew | view-tag }
Display the default cache size for the current host:

getcache -vie·w -hos·t
Display the site-wide default size for view caches:

getcache -vie·w -sit·e
Display cache information for the MVFS:

getcache -mvfs [ -s·hort ]

DESCRIPTION

The getcache command displays cache information for a view or for the multiversion file system (MVFS). View cache information includes cumulative statistics about the number of operations performed and the size of each of the view's caches. (You can specify the total size for the view's caches with the setcache command; that total is allocated among the individual caches.) getcache can also reset the view statistics with the -reset option.

NOTE: Two sets of statistics are kept for a view: the set displayed by -all, which is reset only when the view_server is restarted (with endview -server or by rebooting); and the normal set, which you can zero with the -reset option.

With the -host option, getcache displays the default size of the view cache for the current host. With the -site option, getcache displays the site-wide default size for view caches. With the -mvfs option, getcache displays information about a host's MVFS caches, which are used to optimize file-system performance. (For more information on optimizing performance, see the chapters on performance tuning in Administering ClearCase.)

getcache can sometimes reports cache use greater than 100%. The Object cache, in particular, can show usage exceeding 100% because other objects, including cache objects, can reference the Object cache. Usually, this means the Object cache size is too small compared to the sizes of other caches.

PERMISSIONS AND LOCKS

Permissions Checking: No special permissions required. Locks: No locks apply.

OPTIONS AND ARGUMENTS

SPECIFYING THE CACHE INFORMATION TO DISPLAY. Default: None.

-vie·w: Displays cache information for a single view.

-vie·w -hos·t: Displays the default cache size for the current host. If this value has not been set, getcache displays the following message:

: No host-wide default view cache size is known.

: This value is stored in the ccase-home-dir\var\config\view_cache_size file and is set with setcache -view -host.

-vie·w -sit·e: Displays the site-wide default size for view caches. If this value has not been set, getcache displays the following message:

: No site-wide default view cache size is known.

: This value is stored in the ClearCase site config registry and is set with setcache -view -site or setsite.

-mvfs: Displays cache information for the MVFS. These values are set with setcache -mvfs.

SPECIFYING HOW MUCH INFORMATION TO DISPLAY. Default: With -view, displays statistics gathered since the last reset and the current cache sizes. With -mvfs, displays current cache sizes/utilizations and advice on cache sizing.

-a·ll: Displays view statistics since the time that the view_server was started. These statistics are not reset when you execute getcache -reset.

-view -s·hort: Displays only cache sizes.

-mvfs -s·hort: Displays only cache sizes and utilizations.

RESETTING VIEW STATISTICS. Default: The counters for the normal set of view statistics keep running.

-reset: Displays current statistics, resets them to zero, and prints a summary to the view log.

SPECIFYING A VIEW. Default: None.

-cvi·ew: Displays or resets statistics for the current view.

view-tag: Specifies the view whose statistics are displayed or reset.

EXAMPLES

Examples including wildcards or quoting are written for use in cleartool interactive mode. If you use cleartool single-command mode, you may need to change the wildcards and quoting to make your command interpreter process the command appropriately.

In cleartool single-command mode, cmd-context represents the command interpreter prompt. In cleartool interactive mode, cmd-context represents the interactive cleartool prompt. In Attache, cmd-context represents the workspace prompt.

Display cache information for the cep_dev view:

cmd-context getcache -view cep_dev

Lookup cache: 29% full, 1121 entries ( 56.8K), 15832 requests, 75% hits Readdir cache: 4% full, 24 entries ( 36.5K), 4159 requests, 83% hits Fstat cache: 31% full, 281 entries (105.1K), 55164 requests, 100% hits Object cache: 26% full, 1281 entries (176.6K), 40626 requests, 72% hits Total memory used for view caches: 375.0Kbytes The current view server cache limits are: Lookup cache: 201312 bytes Readdir cache: 838860 bytes Fstat cache: 352296 bytes Object cache: 704592 bytes Total cache size limit: 2097152 bytes

Display cache information for the MVFS:

cmd-context getcache -mvfs

Mnodes: (active/max) 1043/4096 (25.464%) Mnode freelist: 885/900 (98.333%) Cltxt freelist: 41/819 (5.006%)

DNC: Files: 219/800 (27.375%) Directories: 108/200 (54.000%) ENOENT: 106/400 (26.500%)

RPC handles: 2/5 (40.000%)

Attribute cache miss summary (for tuning suggestions, see the documentation for administering ClearCase): Attribute cache total misses: 1215 (100.00%) Close-to-open (view pvt) misses: 434 ( 35.72%) Generation (parallel build) misses: 0 ( 0.00%) Cache timeout misses: 297 ( 24.44%) Cache fill (new file) misses: 1 ( 0.08%) Event time (vob/view mod) misses: 484 ( 39.84%)