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95 lines
2.4 KiB
95 lines
2.4 KiB
3 years ago
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/*-
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* See the file LICENSE for redistribution information.
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*
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* Copyright (c) 1996, 1997, 1998, 1999
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* Sleepycat Software. All rights reserved.
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*/
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#include "db_config.h"
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#ifndef lint
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static const char sccsid[] = "@(#)mp_method.c 11.2 (Sleepycat) 10/6/99";
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#endif /* not lint */
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#ifndef NO_SYSTEM_INCLUDES
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#include <sys/types.h>
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#endif
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#include "db_int.h"
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#include "db_shash.h"
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#include "mp.h"
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static int CDB___memp_set_cachesize __P((DB_ENV *, u_int32_t, u_int32_t, int));
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static int CDB___memp_set_mp_mmapsize __P((DB_ENV *, size_t));
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/*
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* CDB___memp_dbenv_create --
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* Mpool specific creation of the DB_ENV structure.
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*
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* PUBLIC: void CDB___memp_dbenv_create __P((DB_ENV *));
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*/
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void
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CDB___memp_dbenv_create(dbenv)
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DB_ENV *dbenv;
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{
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/*
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* We default to 32 8K pages. We don't default to a flat 256K, because
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* some systems require significantly more memory to hold 32 pages than
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* others. For example, HP-UX with POSIX pthreads needs 88 bytes for
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* a POSIX pthread mutex and almost 200 bytes per buffer header, while
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* Solaris needs 24 and 52 bytes for the same structures.
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*/
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dbenv->mp_bytes = 32 * ((8 * 1024) + sizeof(BH));
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dbenv->mp_ncache = 1;
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dbenv->set_mp_mmapsize = CDB___memp_set_mp_mmapsize;
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dbenv->set_cachesize = CDB___memp_set_cachesize;
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}
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/*
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* CDB___memp_set_cachesize --
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* Initialize the cache size.
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*/
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static int
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CDB___memp_set_cachesize(dbenv, gbytes, bytes, ncache)
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DB_ENV *dbenv;
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u_int32_t gbytes, bytes;
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int ncache;
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{
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ENV_ILLEGAL_AFTER_OPEN(dbenv, "set_cachesize");
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dbenv->mp_gbytes = gbytes + bytes / GIGABYTE;
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dbenv->mp_bytes = bytes % GIGABYTE;
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dbenv->mp_ncache = ncache == 0 ? 1 : ncache;
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/*
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* If the application requested less than 500Mb, increase the
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* cachesize by 25% to account for our overhead. (I'm guessing
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* that caches over 500Mb are specifically sized, i.e., it's
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* a large server and the application actually knows how much
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* memory is available.)
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*
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* There is a minimum cache size, regardless.
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*/
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if (dbenv->mp_gbytes == 0) {
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if (dbenv->mp_bytes < 500 * MEGABYTE)
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dbenv->mp_bytes += dbenv->mp_bytes / 4;
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if (dbenv->mp_bytes < DB_CACHESIZE_MIN)
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dbenv->mp_bytes = DB_CACHESIZE_MIN;
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}
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return (0);
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}
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/*
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* CDB___memp_set_mp_mmapsize --
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* Set the maximum mapped file size.
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*/
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static int
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CDB___memp_set_mp_mmapsize(dbenv, mp_mmapsize )
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DB_ENV *dbenv;
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size_t mp_mmapsize;
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{
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dbenv->mp_mmapsize = mp_mmapsize;
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return (0);
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}
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