Files copy slows down when "Disc Activity Menu Meter" enabled #19

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bobrosoft opened this Issue Dec 21, 2015 · 14 comments

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@bobrosoft

Hi there!

I definitely noticed files copy slowdown when "Display Disc Activity Menu Meter" is "on". Was under copy of 8GB file from my internal SSD to external USB Flash Drive. When I disabled "Disc Activity", copy speed returned back to normal (was near 100 times slower). When enabled -- slowed down again. My settings attached (update interval: 2 sec.). Maybe happens only with USB Flash Drives.

2015-12-21 16 44 05

If you have time, you can check this.

@Nechoer

I confirm. I spent a week trying to figure why my time machine backup takes ages (on a gigabit ethernet connection did not manage to make a backup in 3 full days after 10.11.2 +XCode update which modified some 7Gbyte files)
Switched off disk access monitor and it flies! Is this related to the internal SSD disk? Interestingly network access does not seem to be influenced. I will test and report beck if it does.

@lipwak

Same as Nechoer here. In my case, it also caused Time Machine backups to fail repeatedly since installing it 2 days ago. After removing it from the preference panes backups worked. (Lost all my backups in the process of troubleshooting.)

Throughput was very low/slow using it: single digit kb/s with occasional 3-4 mb/s even when connected to the Time Capsule by ethernet cable. Would LOVE to have this work so hope if can be fixed.

I was using the CPU, Disk and Network meters set to their default settings.

(MacBook Pro 15-inch Retina, Late 2013, SSD, 2.3 GHz Intel Core i7, OSX 10.11.2)

@mikegem

Same as Nechoer. Upgraded my MBPr from Yosemite to El Capitan, Time Machine stopped working. After several days of trying many things, I noticed MM network thruput on the laptop did not match MM network on a target Mini when copying files from laptop to Mini. Found Nechoer's comment here, removed MM from laptop. TM now working to backup laptop to Mini.

@lukehamburg

Does this bug only affect you if you enable network monitoring in MenuMeters? I.e if all you have is a CPU meter displayed would it still occur?

@Nechoer
@TomCooper3

I've been chasing an issue with backup over the network since upgrading to El Capitan. Backup performance has been abysmal. (Strangely when a disk is USB attached, local Time Machine backup is OK.) I'm experimenting with removing MenuMeters to see if that was the issue.

Support did have me try booting and backing up in safe mode - would that have disabled MenuMeters?

@mikegem
@TomCooper3
@DavidFerrington

I've been having problems with Time Machine backups for 3 months. Someone posted in the thread on Apple support about this and I turned off the Disk & Network meters and that's resolved it. Shame, but I didn't really use those meters much, so not too much of a problem.

@TomCooper3
@yujitach
Owner

I believe you can just turn off the disk meter to live without this bug. I'm also pretty sure about the place of the bug in the code now; the disk meter checks the empty space of the drive 10 times a second etc. so I need to do something with it.

@DavidFerrington
@ajkavanagh

I can confirm the same bug (with Time Machine backups) and that just switching the disk monitoring off is sufficient to speed it up again.

@2b-as

I can also confirm the bug with Time Machine, and that switching off Disk Activity Menu Meter returns the backup to normal speed.

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