5

Xcode 11.2.1 simulator 13.2.2 constantly download something daily about 450 MB through nsurlsessiond. Is this usual?

some logs

% sudo lsof | grep nsurlsessiond
Password:
UserEvent   60                   root  txt       REG                1,4      30016 1152921500312497946 /System/Library/UserEventPlugins/com.apple.nsurlsessiond.plugin/Contents/MacOS/com.apple.nsurlsessiond
nsurlsess  215         _nsurlsessiond  cwd       DIR                1,4        736                   2 /
nsurlsess  215         _nsurlsessiond  txt       REG                1,4     614448 1152921500312495196 /usr/libexec/nsurlsessiond
nsurlsess  215         _nsurlsessiond  txt       REG                1,4      28180            23592776 /Library/Preferences/Logging/.plist-cache.99GYDmPS
nsurlsess  215         _nsurlsessiond  txt       REG                1,4   29062064 1152921500312497147 /usr/share/icu/icudt64l.dat
nsurlsess  215         _nsurlsessiond  txt       REG                1,4   10833920            23596379 /private/var/folders/zz/zyxvpxvq6csfxvn_n0000000000000/0/com.apple.LaunchServices.dv/com.apple.LaunchServices-1080-v2.csstore
nsurlsess  215         _nsurlsessiond  txt       REG                1,4    1558064 1152921500312496184 /usr/lib/dyld
nsurlsess  215         _nsurlsessiond    0r      CHR                3,2        0t0                 310 /dev/null
nsurlsess  215         _nsurlsessiond    1u      CHR                3,2        0t0                 310 /dev/null
nsurlsess  215         _nsurlsessiond    2u      CHR                3,2        0t0                 310 /dev/null
nsurlsess  215         _nsurlsessiond    3   NPOLICY                                                   
nsurlsess  215         _nsurlsessiond    5u    systm 0x1ebb302b93b87b91        0t0                     [ctl com.apple.netsrc id 7 unit 7]
UserEvent  311                 xxxx  txt       REG                1,4      30016 1152921500312497946 /System/Library/UserEventPlugins/com.apple.nsurlsessiond.plugin/Contents/MacOS/com.apple.nsurlsessiond
nsurlsess  345                 xxxx  txt       REG                1,4     614448 1152921500312495196 /usr/libexec/nsurlsessiond
UserEvent 8964                 xxxx  txt       REG                1,4      29984            23127670 /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/System/Library/UserEventPlugins/com.apple.nsurlsessiond.plugin/com.apple.nsurlsessiond
nsurlsess 9001                 xxxx  txt       REG                1,4     761744            23119545 /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/libexec/nsurlsessiond
com.apple 9044                 xxxx    3w      REG                1,4   13597149            23603623 /Users/xxxx/Library/Developer/CoreSimulator/Devices/F0685A70-DEB9-4786-8368-CF98BAC7FD1A/data/Library/Caches/com.apple.nsurlsessiond/Downloads/com.apple.mobileassetd/CFNetworkDownload_O3Y86b.tmp/AssetData/adat
xxxx@xxxx-iMac ~ % 

this is launch_sim log

cwd
/
txt
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/libexec/nsurlsessiond
txt
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/dyld_sim
txt
/Users/xxxxxx/Library/Developer/CoreSimulator/Devices/34D7CA2A-2595-4E6F-9622-2252E0BB5A08/data/Library/Preferences/Logging/.plist-cache.ouQB3E7W
txt
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/libobjc-trampolines.dylib
txt
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/share/icu/icudt64l.dat
txt
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/System/Library/PrivateFrameworks/IDSSimulatorSupport.framework/IDSSimulatorSupport
txt
/Users/xxxxxx/Library/Developer/CoreSimulator/Devices/34D7CA2A-2595-4E6F-9622-2252E0BB5A08/data/var/db/lsd/com.apple.LaunchServices-1080-v2.csstore
txt
/usr/lib/dyld
txt
/Users/xxxxxx/Library/Developer/CoreSimulator/Caches/dyld/19B88/com.apple.CoreSimulator.SimRuntime.iOS-13-2.17B102/dyld_sim_shared_cache_x86_64
0
/dev/null
1
/dev/null
2
/dev/null
3
->0xe277ad83c16882a9
4
/Users/xxxxxx/Library/Developer/CoreSimulator/Devices/34D7CA2A-2595-4E6F-9622-2252E0BB5A08/data/var/run/memory_warning_simulation
6
[ctl com.apple.netsrc id 8 unit 41]

this is sim log:

cwd

/

txt

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/sbin/launchd_sim

txt

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/dyld_sim

txt

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/libSystem.B.dylib

txt

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/libobjc.A.dylib

txt

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/libcache.dylib

txt

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/libcommonCrypto.dylib

txt

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/libcompiler_rt.dylib

txt

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/libcopyfile.dylib

txt

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/libcorecrypto.dylib

txt

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/libdispatch.dylib

txt

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/libdyld.dylib

txt

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/liblaunch.dylib

txt

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/libmacho.dylib

txt

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/libremovefile.dylib

txt

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/libsystem_asl.dylib

txt

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/libsystem_blocks.dylib

txt

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/libsystem_c.dylib

txt

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/libsystem_configuration.dylib

txt

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/libsystem_containermanager.dylib

txt

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/libsystem_coreservices.dylib

txt

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/libsystem_darwin.dylib

txt

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/libsystem_dnssd.dylib

txt

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/libsystem_featureflags.dylib

txt

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/libsystem_info.dylib

txt

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/libsystem_m.dylib

txt

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/libsystem_malloc.dylib

txt

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/libsystem_notify.dylib

txt

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/libsystem_sandbox.dylib

txt

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/libsystem_sim_kernel.dylib

txt

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/libsystem_sim_platform.dylib

txt

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/libsystem_sim_pthread.dylib

txt

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/libsystem_trace.dylib

txt

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/libunwind.dylib

txt

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/libxpc.dylib

txt

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/libsystem_sim_pthread_host.dylib

txt

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/libsystem_sim_platform_host.dylib

txt

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/system/libsystem_sim_kernel_host.dylib

txt

/usr/lib/system/libsystem_kernel.dylib

txt

/usr/lib/system/libsystem_platform.dylib

txt

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/libc++abi.dylib

txt

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib/libc++.1.dylib

txt

/usr/lib/system/libsystem_pthread.dylib

txt

/usr/lib/dyld

0

/dev/null

1

/dev/null

2

/private/tmp/com.apple.CoreSimulator.SimDevice.34D7CA2A-2595-4E6F-9622-2252E0BB5A08/launchd.log

3

[ctl com.apple.netsrc id 8 unit 38]

4

->0xe277ad83b83d2d29

5

/tmp/com.apple.CoreSimulator.SimDevice.34D7CA2A-2595-4E6F-9622-2252E0BB5A08/syslogsock

6

/private/tmp/com.apple.CoreSimulator.SimDevice.34D7CA2A-2595-4E6F-9622-2252E0BB5A08/launches.2019-12-10.20.17.19.log

7

/private/tmp/com.apple.launchd.ylqXwtBNy6/com.apple.webinspectord_sim.socket

8

/private/tmp/com.apple.launchd.ylqXwtBNy6/com.apple.webinspectord_sim.socket

9

/private/tmp/com.apple.launchd.5cVa6VutSZ/Listeners

10

/private/tmp/com.apple.launchd.26mpQitX06/com.apple.testmanagerd.unix-domain.socket

11

/private/tmp/com.apple.launchd.5cVa6VutSZ/Listeners

12

/private/tmp/com.apple.launchd.GjbwCBAvpU/com.apple.testmanagerd.remote-automation.unix-domain.socket

13

/private/tmp/com.apple.launchd.26mpQitX06/com.apple.testmanagerd.unix-domain.socket

14

/dev/null

15

/private/tmp/com.apple.launchd.GjbwCBAvpU/com.apple.testmanagerd.remote-automation.unix-domain.socket

16

17

/dev/null

Finally i find a temporary solution!

rename the file com.apple.nsurlsessiond(Dont delete) in

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/System/Library/UserEventPlugins/com.apple.nsurlsessiond.plugin/

to something -com.apple.nsurlsessiond

and also the file nsurlsessiond(Dont delete) in

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/libexec/

to something -nsurlsessiond

Apps with admob works perfectly also no problem with safari

4
  • When does this happen specifically? Every time: Xcode loads, you launch a new simulator, you launch the simulator app or just daily at a specific timestamp? – Harcker Dec 10 '19 at 20:13
  • everytime new simulator opens – Vinu K.N Dec 11 '19 at 3:13
  • It's happening to me now. Lol. I won't give a care to this but I just moved to a new house and I don't have a fiber connection here, but rather a limited data. It's quite a problem for me. Hopefully I find a solution soon. – Glenn Jul 9 '20 at 15:45
  • Please take a tcpdump during this period. After it finishes, collect a sysdiagnose and xcrun simctl diagnose. Attach all three to a new radar (via Feedback Assistant). Please report back the FB# here. – Jeremy Huddleston Sequoia Oct 6 '20 at 16:31
1

While there's an answer in the question itself, (renaming Xcode's internal

/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/System/Library/UserEventPlugins/com.apple.nsurlsessiond.plugin/

binary/ plugin), another way to solve this is firewall.

In system preferences > privacy > firewall, Add Xcode to the list and block all connections.

If that doesn't stop it, download a firewall (like Little Snitch, LuLu) and block more processes.


The Simulators pane of Components preferences shows an entry for each optional simulator runtime. When an optional simulator is available but not installed on your system, Xcode displays a Download button beside that simulator runtime. Xcode can also be configured to automatically keep your installed simulator runtimes up to date.

Download and install a simulator runtime: Click the Download button () next to a simulator runtime.

Check for simulator runtime updates: Click “Check and Install Now.”

Install simulator updates automatically: Select the “Check for and install simulator updates automatically” checkbox.

https://help.apple.com/xcode/mac/10.2/index.html?localePath=en.lproj#/deva7379ae35

enter image description here

4
  • Components pane shows old versions of simulators, I dont use them. – Vinu K.N Dec 11 '19 at 3:18
  • Uncheck the automatically option, as mentioned in the third point in the answer. – anki Dec 11 '19 at 7:20
  • 2
    Still no effect – Vinu K.N Dec 11 '19 at 13:25
  • @VinuK.N Any update, how to resolve that issue? – Hindu Jul 21 '20 at 13:01

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