Re: Performance issue on macOS 10.15 obtaining display name for ~/Desktop, ~/Documents, and ~/Downloads
Re: Performance issue on macOS 10.15 obtaining display name for ~/Desktop, ~/Documents, and ~/Downloads
- Subject: Re: Performance issue on macOS 10.15 obtaining display name for ~/Desktop, ~/Documents, and ~/Downloads
- From: Rob Petrovec via Cocoa-dev <email@hidden>
- Date: Thu, 23 Apr 2020 13:18:38 -0600
> On Apr 23, 2020, at 9:10 AM, Allan Odgaard via Cocoa-dev
> <email@hidden> wrote:
>
> On 23 Apr 2020, at 21:15, Rob Petrovec wrote:
>
>> If what you say is correct then everyone would be seeing a delay since most
>> people don’t have blazing fast internet connections. I do not think this is
>> the normal behavior.
>
> Please try run this in a terminal and report the times:
>
> rm -f /tmp/test.sh && echo $'#!/bin/sh\necho hello' > /tmp/test.sh &&
> chmod a+x /tmp/test.sh && time /tmp/test.sh && time /tmp/test.sh
>
> For this particular issue, it appears the lookup is cached by inode, so only
> first run should take > 50ms, where second one would be < 5ms.
>
> Then maybe also try it with Apple’s Network Link Conditioner and set it to
> simulate lousy internet, and try it also with WiFi disabled.
>
> I have seen the issue on multiple systems, so I do not think this is limited
> to my system, but more data would be great.
I get a 1 second time for the first run and then a much quicker time
for the second. I did some sampling and the longer time due to is Apple’s
check for malware on first run of a process. This is a known, documented and
advertised behavior. It is a one time cost and only effects applications, not
regular files. For a developer though, yeah you get the cost after ever
rebuild. So I don’t think this test is analogous to your initial issue of a
delay opening a file every time.
>> Sending an email to a developer mailing list doesn’t count. Just sayin’...
>
> My email was to ask for help, i.e. whether others have seen this issue, can
> reproduce, have any idea what could cause this, etc.
>
> Of course I am aware that this is not a place to report bugs to Apple…
So did you file a bug? Would you mind posting the bug number? Thanks.
—Rob
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| References: | |
| | >Performance issue on macOS 10.15 obtaining display name for ~/Desktop, ~/Documents, and ~/Downloads (From: Allan Odgaard via Cocoa-dev <email@hidden>) |
| | >Re: Performance issue on macOS 10.15 obtaining display name for ~/Desktop, ~/Documents, and ~/Downloads (From: "David M. Cotter via Cocoa-dev" <email@hidden>) |
| | >Re: Performance issue on macOS 10.15 obtaining display name for ~/Desktop, ~/Documents, and ~/Downloads (From: Allan Odgaard via Cocoa-dev <email@hidden>) |
| | >Re: Performance issue on macOS 10.15 obtaining display name for ~/Desktop, ~/Documents, and ~/Downloads (From: Allan Odgaard via Cocoa-dev <email@hidden>) |
| | >Re: Performance issue on macOS 10.15 obtaining display name for ~/Desktop, ~/Documents, and ~/Downloads (From: Rob Petrovec via Cocoa-dev <email@hidden>) |
| | >Re: Performance issue on macOS 10.15 obtaining display name for ~/Desktop, ~/Documents, and ~/Downloads (From: Allan Odgaard via Cocoa-dev <email@hidden>) |