diff options
Diffstat (limited to 'debian/htdig/htdig-3.2.0b6/db/mp_method.c')
-rw-r--r-- | debian/htdig/htdig-3.2.0b6/db/mp_method.c | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/debian/htdig/htdig-3.2.0b6/db/mp_method.c b/debian/htdig/htdig-3.2.0b6/db/mp_method.c new file mode 100644 index 00000000..91746c05 --- /dev/null +++ b/debian/htdig/htdig-3.2.0b6/db/mp_method.c @@ -0,0 +1,94 @@ +/*- + * See the file LICENSE for redistribution information. + * + * Copyright (c) 1996, 1997, 1998, 1999 + * Sleepycat Software. All rights reserved. + */ +#include "db_config.h" + +#ifndef lint +static const char sccsid[] = "@(#)mp_method.c 11.2 (Sleepycat) 10/6/99"; +#endif /* not lint */ + +#ifndef NO_SYSTEM_INCLUDES +#include <sys/types.h> +#endif + +#include "db_int.h" +#include "db_shash.h" +#include "mp.h" + +static int CDB___memp_set_cachesize __P((DB_ENV *, u_int32_t, u_int32_t, int)); +static int CDB___memp_set_mp_mmapsize __P((DB_ENV *, size_t)); + +/* + * CDB___memp_dbenv_create -- + * Mpool specific creation of the DB_ENV structure. + * + * PUBLIC: void CDB___memp_dbenv_create __P((DB_ENV *)); + */ +void +CDB___memp_dbenv_create(dbenv) + DB_ENV *dbenv; +{ + /* + * 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. + */ + dbenv->mp_bytes = 32 * ((8 * 1024) + sizeof(BH)); + dbenv->mp_ncache = 1; + + dbenv->set_mp_mmapsize = CDB___memp_set_mp_mmapsize; + dbenv->set_cachesize = CDB___memp_set_cachesize; +} + +/* + * CDB___memp_set_cachesize -- + * Initialize the cache size. + */ +static int +CDB___memp_set_cachesize(dbenv, gbytes, bytes, ncache) + DB_ENV *dbenv; + u_int32_t gbytes, bytes; + int ncache; +{ + ENV_ILLEGAL_AFTER_OPEN(dbenv, "set_cachesize"); + + dbenv->mp_gbytes = gbytes + bytes / GIGABYTE; + dbenv->mp_bytes = bytes % GIGABYTE; + dbenv->mp_ncache = ncache == 0 ? 1 : ncache; + + /* + * If the application requested less than 500Mb, increase the + * cachesize by 25% to account for our overhead. (I'm guessing + * that caches over 500Mb are specifically sized, i.e., it's + * a large server and the application actually knows how much + * memory is available.) + * + * There is a minimum cache size, regardless. + */ + if (dbenv->mp_gbytes == 0) { + if (dbenv->mp_bytes < 500 * MEGABYTE) + dbenv->mp_bytes += dbenv->mp_bytes / 4; + if (dbenv->mp_bytes < DB_CACHESIZE_MIN) + dbenv->mp_bytes = DB_CACHESIZE_MIN; + } + + return (0); +} + +/* + * CDB___memp_set_mp_mmapsize -- + * Set the maximum mapped file size. + */ +static int +CDB___memp_set_mp_mmapsize(dbenv, mp_mmapsize ) + DB_ENV *dbenv; + size_t mp_mmapsize; +{ + dbenv->mp_mmapsize = mp_mmapsize; + return (0); +} |