Bug #72983 Dashboard: Negative values for disk read/write

• Submitted: 12 Jun 2014 8:44
• Modified: 7 Jul 2016 11:52
• Reporter: Matthias Maier
• Status: Verified
• Category: MySQL Workbench: Administration
• Severity: S3 (Non-critical)
• Version: 6.3.7
• OS: Microsoft Windows (7 SP1)
• 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.