[devel] version script for libdb4.3
Dmitry V. Levin
=?iso-8859-1?q?ldv_=CE=C1_altlinux=2Eorg?=
Сб Окт 8 01:41:12 MSD 2005
On Mon, Sep 05, 2005 at 01:48:19AM +0400, Dmitry V. Levin wrote:
[...]
> убирание ненужных символов даёт стабилизацию использования и рост скорости
> запуска. На том же libdb4.3 выигрыш умопомрачительный.
Немного цифр:
$ ls -log {old,new}/libdb-4.3.so
-rw-r--r-- 1 854016 Окт 8 00:17 new/libdb-4.3.so
-rw-r--r-- 1 936160 Июн 15 22:31 old/libdb-4.3.so
$ nm -D old/libdb-4.3.so |grep -c '^[0-9a-f]'
1431
$ nm -D new/libdb-4.3.so |grep -c '^[0-9a-f]'
51
$ rm -f my_db.db && env -i LD_DEBUG=statistics LD_LIBRARY_PATH=old ./db_create
12345: number of relocations: 632
12345: number of relocations from cache: 6
12345: number of relative relocations: 1593
12345:
12345: runtime linker statistics:
12345: final number of relocations: 748
12345: final number of relocations from cache: 6
$ rm -f my_db.db && env -i LD_DEBUG=statistics LD_LIBRARY_PATH=new ./db_create
12345: number of relocations: 106
12345: number of relocations from cache: 5
12345: number of relative relocations: 2120
12345:
12345: runtime linker statistics:
12345: final number of relocations: 139
12345: final number of relocations from cache: 5
$ env -i LD_LIBRARY_PATH=old time sh -c 'rm -f my_db.db; for i in `seq 10000`; do ./db_create; done'
5.53user 4.15system 0:09.68elapsed 100%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (1920466major+361627minor)pagefaults 0swaps
$ env -i LD_LIBRARY_PATH=new time sh -c 'rm -f my_db.db; for i in `seq 10000`; do ./db_create; done'
2.82user 3.91system 0:06.72elapsed 100%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (1750466major+351627minor)pagefaults 0swaps
--
ldv
----------- следующая часть -----------
/* Taken from /usr/share/doc/db-4.3.28/gsg/C/DB.html */
#include <db.h>
int
main(void)
{
DB *dbp; /* DB structure handle */
u_int32_t flags; /* database open flags */
int ret; /* function return value */
/* Initialize the structure. This
* database is not opened in an environment,
* so the environment pointer is NULL. */
ret = db_create(&dbp, NULL, 0);
if (ret != 0)
{
/* Error handling goes here */
return 1;
}
/* Database open flags */
flags = DB_CREATE; /* If the database does not exist,
* create it.*/
/* open the database */
ret = dbp->open(dbp, /* DB structure pointer */
NULL, /* Transaction pointer */
"my_db.db", /* On-disk file that holds the database. */
NULL, /* Optional logical database name */
DB_BTREE, /* Database access method */
flags, /* Open flags */
0); /* File mode (using defaults) */
if (ret != 0)
{
/* Error handling goes here */
return 1;
}
return 0;
}
----------- следующая часть -----------
Было удалено вложение не в текстовом формате...
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