关于innodb_buffer_pool_size

streetboy85

我的mysql设了innodb_buffer_pool_size = 2048M，之前启动mysql的时候，会用2G多的内存，但是现在开的时候，发现只用了1G内存，请问没人能解释一下，谢谢！
我们目前是有2台一模一样配置的db server，my.cnf也一样，但是有一台mysql启动后，只用了1G内存，另外一台就2G

[ 本帖最后由 streetboy85 于 2009-4-29 21:01 编辑 ]

streetboy85

這是我部份的innodb status
-------------------------------------
INSERT BUFFER AND ADAPTIVE HASH INDEX
-------------------------------------
Ibuf: size 1, free list len 1692, seg size 1694,
0 inserts, 0 merged recs, 0 merges
Hash table size 8850487, node heap has 469 buffer(s)
331.36 hash searches/s, 501.37 non-hash searches/s
---
LOG
---
Log sequence number 31 2167340869
Log flushed up to   31 2167339787
Last checkpoint at  31 1817278955
0 pending log writes, 0 pending chkp writes
880839 log i/o's done, 89.08 log i/o's/second
----------------------
BUFFER POOL AND MEMORY
----------------------
Total memory allocated 2330217576; in additional pool allocated 8331264
Dictionary memory allocated 853680
Buffer pool size   131072
Free buffers       63273
Database pages     67319
Modified db pages  17287
Pending reads 0
Pending writes: LRU 0, flush list 0, single page 0
Pages read 60643, created 6676, written 172809
0.67 reads/s, 1.45 creates/s, 1.93 writes/s
Buffer pool hit rate 1000 / 1000
--------------
ROW OPERATIONS
--------------
2 queries inside InnoDB, 0 queries in queue
2 read views open inside InnoDB
Main thread process no. 6620, id 685824912, state: sleeping
Number of rows inserted 2510707, updated 280021, deleted 2463653, read 871433433
303.64 inserts/s, 29.15 updates/s, 298.51 deletes/s, 1066971.10 reads/s
----------------------------
END OF INNODB MONITOR OUTPUT
============================

1 row in set, 1 warning (0.01 sec)

ERROR:
No query specified


是设了2G，但是top的时候，RES只有1.2G，VIRT是2387m
另外一台机器是RES 2.2G，VIRT是2385m，上面的那台比这台负载高很多