[MDEV-12097] Innodb allocates almost 3GB instead if requested 1.5GB Created: 2017-02-20  Updated: 2017-06-30  Resolved: 2017-06-30

Status: Closed
Project: MariaDB Server
Component/s: Storage Engine - InnoDB
Affects Version/s: 10.2
Fix Version/s: 10.2.7

Type: Bug Priority: Major
Reporter: Vladislav Vaintroub Assignee: Vladislav Vaintroub
Resolution: Fixed Votes: 0
Labels: None

Issue Links:
Relates
relates to MDEV-11520 Extending an InnoDB data file unneces... Closed
relates to MDEV-13177 MariaDB 10.2.6 eats virtual memory Closed

 Description   

This is a followup of MDEV-11520 .
32bit Windows, with innodb_buffer_pool_size set to 1500M.
however, error log (https://jira.mariadb.org/secure/attachment/42987/error.log) claims that 2.75GB were allocated instead, which is almost double the requested size. This creates memory pressure, resulting into failing allocations later, since only around 1GB virtual memory is left for the whole server(i.e on 64 Windows running 32bit mysqld.exe, because on 32bit Windows, this rounding would result in a server that cannot start


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