[Date Prev][Date Next] [Chronological] [Thread] [Top]

(ITS#7841) high disk utilization

Full_Name: Dmitrii Fonariuk
Version: 2.4.38
OS: rhEL6.x86_64
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (

There is a big value of DISK WRITE parameter in utility Iotop when in MDB a lot
of Free pages (Freelist Status). Supposedly this situation arises from memory
management algorithm. The algorithm FIFO is used for pages block allocation in
free pages pool. We touched and dirty different pages on every modification
transaction, which then flushed to disk by system process Flush. Perhaps it
would be better to use the LIFO, which will to dirty the same pages by different
transactions, which reduces the load on the disk?
we use MDB with EnvFlags writemap and mapasync.