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Berkeley DB: DB_ENV->memp_stat
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DB_ENV->memp_stat
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#include <db.h>
int
DB_ENV->memp_stat(DB_ENV *env, DB_MPOOL_STAT **gsp,
DB_MPOOL_FSTAT *(*fsp)[], u_int32_t flags);
int
DB_ENV->memp_stat_print(DB_ENV *env, u_int32_t flags);
Description: DB_ENV->memp_stat
The DB_ENV->memp_stat method returns the memory pool (that is, the buffer
cache) subsystem statistics.
The DB_ENV->memp_stat method creates statistical structures of type DB_MPOOL_STAT
and DB_MPOOL_FSTAT, and copy pointers to them into user-specified memory
locations. The cache statistics are stored in the DB_MPOOL_STAT structure
and the per-file cache statistics are stored the DB_MPOOL_FSTAT structure.
Statistical structures are stored in allocated memory. If application-specific allocation
routines have been declared (see DB_ENV->set_alloc for more
information), they are used to allocate the memory; otherwise, the
standard C library malloc(3) is used. The caller is
responsible for deallocating the memory. To deallocate the memory, free
the memory reference; references inside the returned memory need not be
individually freed.
If gsp is non-NULL, the global statistics for the cache
mp are copied into the memory location to which it refers.
The following DB_MPOOL_STAT fields will be filled in:
size_t st_gbytes;- Gigabytes of cache (total cache size is st_gbytes + st_bytes).
size_t st_bytes;- Bytes of cache (total cache size is st_gbytes + st_bytes).
u_int32_t st_ncache;
u_int32_t st_max_ncache;
roff_t st_regsize;- Individual cache size, in bytes.
size_t st_mmapsize;- Maximum memory-mapped file size.
int st_maxopenfd;- Maximum open file descriptors.
int st_maxwrite;- Maximum sequential buffer writes.
db_timeout_t st_maxwrite_sleep;- Microseconds to pause after writing maximum sequential buffers.
u_int32_t st_map;- Requested pages mapped into the process' address space (there is no
available information about whether or not this request caused disk I/O,
although examining the application page fault rate may be helpful).
u_int32_t st_cache_hit;- Requested pages found in the cache.
u_int32_t st_cache_miss;- Requested pages not found in the cache.
u_int32_t st_page_create;- Pages created in the cache.
u_int32_t st_page_in;- Pages read into the cache.
u_int32_t st_page_out;- Pages written from the cache to the backing file.
u_int32_t st_ro_evict;- Clean pages forced from the cache.
u_int32_t st_rw_evict;- Dirty pages forced from the cache.
u_int32_t st_page_trickle;
u_int32_t st_pages;
u_int32_t st_page_clean;- Clean pages currently in the cache.
u_int32_t st_page_dirty;- Dirty pages currently in the cache.
u_int32_t st_hash_buckets;- Number of hash buckets in buffer hash table.
u_int32_t st_hash_searches;- Total number of buffer hash table lookups.
u_int32_t st_hash_longest;- Longest chain ever encountered in buffer hash table lookups.
u_int32_t st_hash_examined;- Total number of hash elements traversed during hash table lookups.
u_int32_t st_hash_nowait;- Number of times that a thread of control was able to obtain a hash
bucket lock without waiting.
u_int32_t st_hash_wait;- Number of times that a thread of control was forced to wait before
obtaining a hash bucket lock.
u_int32_t st_hash_max_nowait;- The number of times a thread of control was able to obtain the hash
bucket lock without waiting on the bucket which had the maximum number
of times that a thread of control needed to wait.
u_int32_t st_hash_max_wait;- Maximum number of times any hash bucket lock was waited for by a
thread of control.
u_int32_t st_region_wait;- Number of times that a thread of control was forced to wait before
obtaining a cache region mutex.
u_int32_t st_region_nowait;- Number of times that a thread of control was able to obtain a cache
region mutex without waiting.
u_int32_t st_mvcc_frozen;- Number of buffers frozen.
u_int32_t st_mvcc_thawed;- Number of buffers thawed.
u_int32_t st_mvcc_freed;- Number of frozen buffers freed.
u_int32_t st_alloc;- Number of page allocations.
u_int32_t st_alloc_buckets;- Number of hash buckets checked during allocation.
u_int32_t st_alloc_max_buckets;- Maximum number of hash buckets checked during an allocation.
u_int32_t st_alloc_pages;- Number of pages checked during allocation.
u_int32_t st_alloc_max_pages;- Maximum number of pages checked during an allocation.
u_int32_t st_io_wait;- Number of operations blocked waiting for I/O to complete.
If fsp is non-NULL, a pointer to a NULL-terminated
variable length array of statistics for individual files, in the cache
mp, is copied into the memory location to which it refers. If
no individual files currently exist in the cache, fsp will be
set to NULL.
The per-file statistics are stored in structures of type DB_MPOOL_FSTAT.
The following DB_MPOOL_FSTAT fields will be filled in for each file in
the cache; that is, each element of the array:
char * file_name;
size_t st_pagesize;
u_int32_t st_cache_hit;- Requested pages found in the cache.
u_int32_t st_cache_miss;- Requested pages not found in the cache.
u_int32_t st_map;- Requested pages mapped into the process' address space.
u_int32_t st_page_create;- Pages created in the cache.
u_int32_t st_page_in;- Pages read into the cache.
u_int32_t st_page_out;- Pages written from the cache to the backing file.
The DB_ENV->memp_stat method may not be called before the DB_ENV->open method is called.
The DB_ENV->memp_stat method
returns a non-zero error value on failure
and 0 on success.
Parameters
flags- The flags parameter must be set to 0 or
the following value:
DB_STAT_CLEAR- Reset statistics after returning their values.
fsp- The fsp parameter references memory into which
a pointer to the allocated per-file statistics structures is copied.
gsp- The gsp parameter references memory into which
a pointer to the allocated global statistics structure is copied.
Errors
The DB_ENV->memp_stat method
may fail and return one of the following non-zero errors:
EINVAL- An
invalid flag value or parameter was specified.
Description: DB_ENV->memp_stat_print
The DB_ENV->memp_stat_print method displays the
memory pool subsystem statistical information, as described for the DB_ENV->memp_stat method.
The information is printed to a specified output channel (see the
DB_ENV->set_msgfile method for more information), or passed to an
application callback function (see the DB_ENV->set_msgcall method for
more information).
The DB_ENV->memp_stat_print method may not be called before the DB_ENV->open method is called.
The DB_ENV->memp_stat_print method
returns a non-zero error value on failure
and 0 on success.
Parameters
flags- The flags parameter must be set to 0 or by bitwise inclusively OR'ing together one
or more of the following values:
DB_STAT_ALL- Display all available information.
DB_STAT_CLEAR- Reset statistics after displaying their values.
DB_STAT_MEMP_HASH- Display the buffers with hash chains.
Class
DB_ENV, DB_MPOOLFILE
See Also
Memory Pools and Related Methods
Copyright (c) 1996,2008 Oracle. All rights reserved.