Bug #72983 Dashboard: Negative values for disk read/write
Submitted: 12 Jun 2014 8:44 Modified: 7 Jul 2016 11:52
Reporter: Matthias Maier Email Updates:
Status: Verified Impact on me:
None 
Category:MySQL Workbench: Administration Severity:S3 (Non-critical)
Version:6.3.7 OS:Microsoft Windows (7 SP1)
Assigned to: CPU Architecture:Any
Tags: chart, dashboard, negative value

[12 Jun 2014 8:44] Matthias Maier
Description:
In MySQL Workbench Dashboard charts for InnoDB disk read/writes can have negative values and bleed out until border of window (see attached   screenshots).

How to repeat:
Navigator -> Performance Dashboard -> InnoDB Status
Monitor InnoDB Disk Writes and InnoDB Disk Reads charts until they fall below zero.

Suggested fix:
Correct chart data
[12 Jun 2014 8:46] Matthias Maier
Dashboard InnoDB Disk Writes

Attachment: Dashboard_InnoDB_DiskWrites.png (image/x-png, text), 8.21 KiB.

[12 Jun 2014 8:46] Matthias Maier
Dashboard InnoDB Disk Reads

Attachment: Dashboard_InnoDB_DiskReads.png (image/x-png, text), 8.14 KiB.

[12 Jun 2014 11:42] Umesh Shastry
Hello Matthias,

Thanks you for the bug report.
Verified as described.

Thanks,
Umesh
[12 Jun 2014 11:44] Umesh Shastry
// How to repeat

1. Setup MySQL instance with max_connections to > 1000
2. Put some load with the help of mysqlslap

mysqlslap --concurrency=1000 --iterations=100 --auto-generate-sql -x 15 -y 10 --auto-generate-sql-load-type=write --engine=innodb

3. Monitor the Client Connection graphs

Most of them will show negative values.
[13 Jul 2015 13:19] Matthew Roberts
Bug report still valid as of MySQL Workbench version 6.3.3.
[7 Jul 2016 11:43] Matthias Maier
Bug report still valid as of MySQL Workbench version 6.3.7.
[7 Jul 2016 11:52] Matthias Maier
Bug report still valid as of MySQL Workbench version 6.3.7.