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/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 1996-2002
* Sleepycat Software. All rights reserved.
*/
#include "db_config.h"
#ifndef lint
static const char revid[] = "$Id: mp_method.c,v 11.29 2002/03/27 04:32:27 bostic Exp $";
#endif /* not lint */
#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>
#ifdef HAVE_RPC
#include <rpc/rpc.h>
#endif
#endif
#include "db_int.h"
#include "dbinc/db_shash.h"
#include "dbinc/mp.h"
#ifdef HAVE_RPC
#include "dbinc_auto/db_server.h"
#include "dbinc_auto/rpc_client_ext.h"
#endif
static int __memp_set_cachesize __P((DB_ENV *, u_int32_t, u_int32_t, int));
static int __memp_set_mp_mmapsize __P((DB_ENV *, size_t));
/*
* __memp_dbenv_create --
* Mpool specific creation of the DB_ENV structure.
*
* PUBLIC: void __memp_dbenv_create __P((DB_ENV *));
*/
void
__memp_dbenv_create(dbenv)
DB_ENV *dbenv;
{
/*
* !!!
* Our caller has not yet had the opportunity to reset the panic
* state or turn off mutex locking, and so we can neither check
* the panic state or acquire a mutex in the DB_ENV create path.
*
* We default to 32 8K pages. We don't default to a flat 256K, because
* some systems require significantly more memory to hold 32 pages than
* others. For example, HP-UX with POSIX pthreads needs 88 bytes for
* a POSIX pthread mutex and almost 200 bytes per buffer header, while
* Solaris needs 24 and 52 bytes for the same structures. The minimum
* number of hash buckets is 37. These contain a mutex also.
*/
dbenv->mp_bytes =
32 * ((8 * 1024) + sizeof(BH)) + 37 * sizeof(DB_MPOOL_HASH);
dbenv->mp_ncache = 1;
#ifdef HAVE_RPC
if (F_ISSET(dbenv, DB_ENV_RPCCLIENT)) {
dbenv->set_cachesize = __dbcl_env_cachesize;
dbenv->set_mp_mmapsize = __dbcl_set_mp_mmapsize;
dbenv->memp_dump_region = NULL;
dbenv->memp_fcreate = __dbcl_memp_fcreate;
dbenv->memp_nameop = NULL;
dbenv->memp_register = __dbcl_memp_register;
dbenv->memp_stat = __dbcl_memp_stat;
dbenv->memp_sync = __dbcl_memp_sync;
dbenv->memp_trickle = __dbcl_memp_trickle;
} else
#endif
{
dbenv->set_cachesize = __memp_set_cachesize;
dbenv->set_mp_mmapsize = __memp_set_mp_mmapsize;
dbenv->memp_dump_region = __memp_dump_region;
dbenv->memp_fcreate = __memp_fcreate;
dbenv->memp_nameop = __memp_nameop;
dbenv->memp_register = __memp_register;
dbenv->memp_stat = __memp_stat;
dbenv->memp_sync = __memp_sync;
dbenv->memp_trickle = __memp_trickle;
}
}
/*
* __memp_set_cachesize --
* Initialize the cache size.
*/
static int
__memp_set_cachesize(dbenv, gbytes, bytes, ncache)
DB_ENV *dbenv;
u_int32_t gbytes, bytes;
int ncache;
{
ENV_ILLEGAL_AFTER_OPEN(dbenv, "set_cachesize");
/* Normalize the values. */
if (ncache == 0)
ncache = 1;
/*
* You can only store 4GB-1 in an unsigned 32-bit value, so correct for
* applications that specify 4GB cache sizes -- we know what they meant.
*/
if (gbytes / ncache == 4 && bytes == 0) {
--gbytes;
bytes = GIGABYTE - 1;
} else {
gbytes += bytes / GIGABYTE;
bytes %= GIGABYTE;
}
/* Avoid too-large cache sizes, they result in a region size of zero. */
if (gbytes / ncache > 4 || (gbytes / ncache == 4 && bytes != 0)) {
__db_err(dbenv, "individual cache size too large");
return (EINVAL);
}
/*
* If the application requested less than 500Mb, increase the cachesize
* by 25% and factor in the size of the hash buckets to account for our
* overhead. (I'm guessing caches over 500Mb are specifically sized,
* that is, it's a large server and the application actually knows how
* much memory is available. We only document the 25% overhead number,
* not the hash buckets, but I don't see a reason to confuse the issue,
* it shouldn't matter to an application.)
*
* There is a minimum cache size, regardless.
*/
if (gbytes == 0) {
if (bytes < 500 * MEGABYTE)
bytes += (bytes / 4) + 37 * sizeof(DB_MPOOL_HASH);
if (bytes / ncache < DB_CACHESIZE_MIN)
bytes = ncache * DB_CACHESIZE_MIN;
}
dbenv->mp_gbytes = gbytes;
dbenv->mp_bytes = bytes;
dbenv->mp_ncache = ncache;
return (0);
}
/*
* __memp_set_mp_mmapsize --
* Set the maximum mapped file size.
*/
static int
__memp_set_mp_mmapsize(dbenv, mp_mmapsize )
DB_ENV *dbenv;
size_t mp_mmapsize;
{
dbenv->mp_mmapsize = mp_mmapsize;
return (0);
}
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